CATALOG SECTION A

Thermocouples & RTD’s

WWW.SANDELIUS.COM

INDEX
Pg.
Beaded Type Thermocouple Element ................................................................................... A-8
Bearing Thermocouples ....................................................................................................... A-13
Calibration (NIST Traceable) ................................................................................................. A-2
Furnace Tube Temperature Thermocouples ........................................................................ A-11
Insulated Thermocouple and Extension Wire ...................................................................... A-12
Insulated Wire Type Thermocouples ................................................................................... A-13
Metal Sheath Type Thermocouples ........................................................................ A-2 thru A-11
Assemblies with Flexible Leads ............................................................... A-4 thru A-5
Assemblies with Quick Disconnectors ................................................................... A-3
Assemblies with Terminal Heads .................................................................... A-6, A-7
High Pressure Assemblies ................................................................................... A-15
Multi-Point Assemblies ...........................................................................................A-9
Replacement Assemblies ............................................................................... A-2, A-8
Remote Mounted Head Assemblies ............................................................... A-4, A-5
Thermocouples for the Plastic Industries ................................................... A-14, A-15
Platinum Thermocouple Elements ......................................................................................... A-8
RTD Elements & Assemblies ...................................................................................... A-20, A-21
Special Thermocouple & RTD Assemblies ............................................................................ A-2
Accessories ....................................................................................................... A-11, A-16, A-18
Fittings ........................................................................................................ A-16, A-17
Heads ................................................................................................... A-17 thru A-19
Weld-Pads, Weld Clips & Covers .........................................................................A-11
Wire ......................................................................................................................A-12

Sandelius Instruments, Inc.

Tel: 713.861.1100
800.847.5742
Physical Address: Fax: 713.861.9136 Mailing Address:
1407 W. Patton Street Web: www.sandelius.com PO Box 30098
Houston, Texas 77009 Email: info@sandelius.com Houston, Texas 77249-0098

Rev. 8 • 10.2012
THERMOCOUPLE ASSEMBLIES
THERMOCOUPLE ASSEMBLES
The following pages illustrate most of the commonly used types of industrial thermocouple assemblies. If you do not find exactly what you need, we will
gladly manufacture special thermocouple assemblies per your exact specifications. When necessary, our own machine shop can quickly fabricate many
types of unusual components to avoid unnecessary and costly delivery delays. We, at Sandelius, are committed to do everything possible to supply our
customers with exactly what they need, when they need it.

METAL SHEATH TYPE ASSEMBLIES

Pages A-2 through A-11 of this catalog deal with metal sheath type thermocouple assemblies. Sandelius metal sheath type thermocouples represent the
current state-of-the-art in thermocouple probe technology. The outside metal sheath protects both the thermocouple conductors and the compacted
magnesium oxide (MgO) insulation from potential damage and failure caused by corrosion, contamination, oxidation or mechanical shock. Metal sheath
type assemblies are easy to work with and install. The sheath material can be bent to a radius equal to approximately twice its diameter without damage.
It maintains its shape after bending allowing it to be formed to fit any application. The rugged, gas-tight nature of the metal sheath makes gas-tight sealing
a simple matter even without the use of a thermowell or protecting tube. When used inside a thermowell or protecting tube, the metal sheath protects the
conductors from oxidation and provides an added margin of protection without appreciable loss of response time.

RTD ASSEMBLIES
Sandelius Instruments, Inc. also manufactures a full line of RTD assemblies. Any of the assembly styles described in this brochure can be modified to
incorporate an RTD element in place of the thermocouple element. Specifications and ordering numbers for some of the more commonly used RTD type
assemblies can be found on pages 20 and 21 of this catalog. Or you may simply call us and describe the assembly you need.

NIST TRACEABLE CALIBRATION

Sandelius maintains a state-of-the-art computerized temperature calibration laboratory to provide temperature calibration tests which are fully traceable to
the National Institute of Standards and Technology (NIST; formerly NBS). Certificates of Calibration are available for all calibrated items. Reports can be
customized to suit any special customer requirements.

RUSH DELIVERY REQUIREMENTS

We realize the lack of a simple thermocouple, RTD or thermowell assembly can sometimes shutdown the entire plant or production line. Because we care
about our customers, the people at Sandelius are ready to do whatever it takes to get out emergency orders in the minimum amount of time possible. In
critical situations you will find we can even ship specially made materials in less than 24 hours.
If you do not have a current listing of our emergency late night and weekend telephone numbers, please call or write to request one. You never know when
you may need it.

Sandelius Style 1A To Order Specify

Element with cold end stripped to expose solid conductors.
(Normally ordered as a replacement element for an existing assembly.)
1A—250J316—G—24—S2—
Options if any. Mounting Fittings
Pgs. A-16 & A-17 Weld Pads Pg. A-11
L S
S - length in inches
L - length in inches
MEASURING EPOXY SEAL Junction Pg. A-10
METAL SHEATH
JUNCTION PVC INSULATION Element Pg. A-10
Assembly Style (See below for spring-loading)
Maximum recommended “S” length: 0.188” O.D. or larger 4 inches
0.125” O.D. or smaller 1 inch

Sandelius Style 3A - Element with Insulated Leads

Intended exclusively for installations where the transition area is To Order Specify
protected inside a thermowell, protecting tube, nipple or terminal head
3A—188K600—G—30—G1S—6
and is not subjected to mechanical stress. (Normally ordered as a
replacement element. Available in 0.188” dia. and larger only). E Length in inches

L E Leadwire see pg. 5

L - length in inches
1/2”
nom. Junction Pg. A-10
Element Pg. A-10
MEASURING OPTIONAL Assembly Style (See below for spring-loading)
METAL SHEATH TRANSITION INSULATED
JUNCTION SPRING
AREA IS THE WIRE LEADS
(see below)
SAME O.D.
AS THE SHEATH

Spring-Loading “A” Series Assemblies

1) If spring-loading is desired, insert an “S” in front of the assembly style designation (e.g. S1A). Standard Sandelius springs are 2” long high
temperature Inconel swage type springs. These adjustable springs can be forced to slide up or down the sheath for accurate positioning in the field.
Testing has proven that these springs will not slip in service even when subjected to tempeatures of over 1500º F.
2) While Style 1A assemblies can be spring-loaded, we recommend the use of Style 3A assemblies with stranded leadwires for spring-loading.
3) When spring-loading either 1A or 3A Style assemblies, it is good practice to loop the conductors before attaching them to the terminal block. This loop
provides the slack necessary to allow for up and down travel of the sheath.

A-2 Rev. 4
SANDELIUS INSTRUMENTS, INC.
Sandelius Style 1B – Element with Standard 2-Pole Plug or Jack
Sandelius Style 2B – Element with Standard Size High Temperature* 2-Pole Plug or Jack
Sandelius Style 7B – Element with Standard Size Ultra-High Temperature* 2-Pole Plug or Jack

k
+
MEASURING METAL SHEATH
JUNCTION
STANDARD SIZE QUICK
DISCONNECT PLUG or JACK
To Order See Below

Sandelius Style 3B – Element with Miniature Plug or Jack (Not available in dual element)
Sandelius Style 4B – Element with Miniature High Temperature* Plug or Jack (Not available in dual element)

–
+
MEASURING METAL SHEATH
JUNCTION MINIATURE SIZE QUICK
DISCONNECT PLUG or JACK

To Order See Below

Sandelius Style 5B – Element with Standard 3-Pole Plug or Jack

Sandelius Style 6B – Element with Standard Size High Temperature* 3-Pole Plug or Jack
L

k
+
MEASURING METAL SHEATH
JUNCTION
3-POLE QUICK DISCONNECT
To Order See Below PLUG or JACK

To Order Any “B” Series Assembly Specify

1B—M—125K316—R—33—
Options if any. For Mounting Fittings see. pgs. A-16 and A-17
L–Length in inches For Weld Pads see pg. A-11
Junction (see pg. A-10)
Element (see pg. A-10)
Configguration (see below)
Assembly Style

Plug & Jack Configurations for “B” Series Assemblies

ORDER SYMBOL DESCRIPTION
M Male connector (plug) mounted on the sheath with no mating connector
MF Male connector (plug) mounted on the sheath. Furnished complete with matching female connector (jack)
F Female connector (jack) mounted on the sheath with no mating connector
FM Female connector (jack) mounted on the sheath. Furnished complete with matching male connector (plug)

* Standard connectors are rated for ambient temperatures of 350ºF continuous or 400ºF intermittent.
High temperature connectors are rated for ambient temperatures of 500ºF continuous or 550ºF intermittent.
Ultra-high temperature connectors are rated for ambient temperatures of 800ºF continuous or 1000ºF intermittent.

A-3 Rev. 3
SANDELIUS INSTRUMENTS, INC.
Sandelius Style 1T – Element with Transition Fitting and Insulated Wire Leads
Sandelius Style 2T*– Element with Transition Fitting and Stainless Steel Overbraided Insulated Wire Leads

L 1” E
MEASURING
NOMINAL
JUNCTION

INSULATED WIRE

METAL SHEATH STAINLESS STEEL TRANSITION FITTING

WITH SPRING-TYPE STRAIN RELIEF * Normally the leadwires on dual element “2T” style
assemblies are individually overbraided. If you prefer both
To Order See Page A-5 leads to be under a single SS overbraird, specify style “2T1-”

Sandelius Style 3T – Element with smooth (same OD size) transition piece and insulated wire leads. This assembly is commonly
used with a weld pad for furnace tube skin temperature measurements (see pg. A-11).
Available only in 0.188” OD or larger.

L 1” E
MEASURING
NOMINAL
JUNCTION

TRANSITION AREA INSULATED WIRE

SHOWN WITH
OPTIONAL WELD PAD METAL SHEATH NOTE: Mounting fittings should not
To Order See Page A-5 be located in the transition area.

Sandelius Style 4T, 4TP1 & 4TT 2– Element with transition fitting and flexible SS armor over insulated wire leads

L 1.875” E 6”
MEASURING
NOMINAL SEE NOTE 3
JUNCTION

STAINLESS STEEL FLEXIBLE STAINLESS INSULATED WIRE

METAL SHEATH TRANSITION FITTING STEEL ARMOR

To Order See Page A-5

Sandelius Style 6T, 6TP1 & 6TT 2– Element with transition fitting and flexible SS armor over insulated wire leads.
A 2-inch long stainless steel tube is brazed into the end of the armor to allow use of a compression fitting to connect
to a head or terminal box.
L 1.875” E 2” 6”
MEASURING
NOMINAL SEE NOTE 3
JUNCTION

STAINLESS STEEL FLEXIBLE STAINLESS STAINLESS INSULATED WIRE

METAL SHEATH TRANSITION FITTING STEEL ARMOR STEEL TUBE
0.25” O.D.

To Order See Page A-5

CONDUIT
Typical Sandelius “T” series thermocouple in a remote mounted head HEAD
application. Note proper installation includes a drip loop that should be
lower than both the head and the thermowell for proper water run off.
Shielded PVC insulated wire part numbers MOUNTING
FITTING METAL
“P4” or “P5” are often used in this type of SHEATH
application without the stainless steel armor
shown here.

THERMOWELL HEAD
TRANSITION MOUNTING
NOTES: FITTING
1. Styles 4TP and 6TP have a PVC jacket over the stainless steel armor. SHOWN WITH SS TUBE
2. Styles 4TT and 6TT have a Teflon jacket over the stainless steel armor. OPTIONAL
3. The leadwire may be extended more than the standard 6” beyond the end of the armor. SS ARMOR
To specify, insert two numbers into the “E Length” section of the part number separated OVER LEADWIRE
(STYLE 6T)
by a ‘+’ sign e.g. (36+12) would mean 36” of armor and 48” of leadwire (12” beyond the armor).

A-4 Rev. 6
SANDELIUS INSTRUMENTS, INC.
To Order Any “T” Series Assembly Specify

6TP—250K600—G—120—T1—240– –
Options if any. Mounting Fittings Pg. A-16 & A-17
Weld Pads Pg. A-11
Termination Style, see below
E - Length in inches
Lead wire type, see below
L - length in inches
Junction Pg. A-10
Element Pg. A-10
Assembly Style

Lead Wire Choices

Standard Leadwires are furnished with 20 gauge conductors unless otherwise noted below. Many other gauge sizes and constructions are available.
Consult factory for ordering information.

Maximum
Continuous
Order Conductor Insulation Type Operating Abrasion Moisture Available in
Symbol Type Individual Conductors / Overall Temperature Resistance Resistance ANSI Types
T1 Solid Teflon/Teflon 400ºF Very Good Excellent J, K, E &T
T1S Stranded Teflon/Teflon 400ºF Very Good Excellent J&K
G1 Solid Fiberglass/Fiberglass 950ºF Fair Good J, K, T, E, SX & RX
G1S Stranded Fiberglass/Fiberglass 950ºF Fair Good J&K
P1 Solid PVC/PVC 221ºF Good Excellent JX, KX, TX & EX
P1S Stranded PVC/PVC 221ºF Good Excellent JX, KX, EX & TX
P4 Solid PVC/PVC, twisted pair with aluminum 221ºF Good Excellent JX, KX, TX & EX
backed tape shield with drain wire
P4D Solid Same as P4 except 2 pair under a 221ºF Good Excellent JX & KX
single PVC jacket. For use on dual
element assemblies
P5S 18 ga. PVC/PVC with metallic overbraid shield 221ºF Good Excellent JX, KX & EX
Stranded under overall PVC jacket
P5D 18 ga. Same as P5S except 2 pair under a 221ºF Good Excellent JX, KX & EX
Stranded single PVC jacket. For use on dual
element assemblies
K1 Solid Kapton/Kapton 500ºF Excellent Excellent J&K
K1S Stranded Kapton/Kapton 500ºF Excellent Excellent J&K

TERMINATION STYLES FOR “T” SERIES ASSEMBLIES

ORDER ORDER ORDER
SYMBOL DESCRIPTION SYMBOL DESCRIPTION SYMBOL DESCRIPTION

Leave
Blank Plain End / Bare Leads
k

X-A46B
M1* Standard Plug (400ºF) See pages
S M2* High Temperature Std. Size Plug (550ºF) A-18 & A-19
M3* Miniature Plug (400ºF) for available
Spade Lugs Head choices
M5* Special 3-Pin Std. Size Plug (400ºF)
Head of your choice mounted
M7* Ultra-High Temperature Std. Size Plug (800ºF)
with a 1/2” NPT Cord Grip.

BX
k

CB14-E44B 1/2” NPT

1/2” NPT Malleable Iron F1* Standard Jack (400ºF) See pages Compression
“BX” Type Fitting F2* High Temperature Std. Size Jack (550ºF) A-18 & A-19 Fitting
F3* Miniature Jack (400ºF) for available
F5* Special 3-Pin Std. Size Jack (400ºF) Head choices
F7* Ultra-High Temperature Std. Size Jack (800ºF)

X Head Mounted with Compression

CF14-E44B Fitting (Available on Style 6T only)
XA See pages
A-18 & A-19 Your choice of heads A-18 & A19
XN Cord Grip - 1/2” NPT for available and fittings Brass [PN: CB14] or
X - Standard Plated Grip MD1* Standard Dual Plug Head choices SS [PN: CF14].
XS XA - Aluminum MD2* High Temperature Dual Plugs
XN - Nylon *If mating plug is desired add the suffix “M”.
XS - Stainless Steel Example: MD1M

If a plain mating jack or plug is desired add the suffix “M”. Examples: M1M, F2M.
If mating jack or plug complete with matching cable clamp is desired, add the suffix “MC”. Examples: M1MC, F2MC.

A-5 Rev. 7
SANDELIUS INSTRUMENTS, INC.
To order any style on this page see below:
L A

Sandelius Style 1H –
Head Mounted with a
Nipple-Union-Nipple
(For spring-loading , MEASURING
NIPPLE NIPPLE
insert an “S” in front of JUNCTION
UNION
the style number) METAL SHEATHED OR OPTIONAL HEAD OF
INSULATOR TYPE ELEMENT THERMOWELL YOUR CHOICE

L A
Sandelius Style 2H –
Head Mounted with a
Nipple Only (For
spring-loading , insert
an “S” in front of the
MEASURING
style number) JUNCTION METAL SHEATHED OR OPTIONAL NIPPLE HEAD OF
INSULATOR TYPE ELEMENT THERMOWELL YOUR CHOICE

Sandelius Style 3H – L A

Head Mounted with a

Nipple-Union Only (For
spring-loading , insert an
“S” in front of the style
number) MEASURING NIPPLE
JUNCTION METAL SHEATHED OR OPTIONAL
INSULATOR TYPE ELEMENT PROTECTING TUBE UNION HEAD OF
YOUR CHOICE

Style 7H – METAL SHEATH UNION

Nipple-Union-Brazed
SS Fitting - Head
(For spring-loading ,
insert an “S” in front of
the style number)
MEASURING
JUNCTION OPTIONAL NIPPLE SS HEX FITTING
THERMOWELL

HEAD OF YOUR CHOICE

To Order Any Style 1H, 2H, 3H or 7H Assembly Specify: Optional Internal Pressure Seal
Internal pressure seals are used in applictions where thermowells are subjected to extremely harsh
environments which may cause thermowell failure. If the thermowell does in fact fail, the pressure seal
S1H–250K316–G–18–4G6–C46B–(Optional Thermowell) 2 confines the process preventing the escape of process liquids and/or gases until a new thermowell can
be installed.
See Catalog Section B1
Head Pages A-18 & A-19 This design may also be used to seal off thermocouples which must be inserted directly into a furnace
or process stream without the use of a thermowell.
Nominal A Dimension in inches
Nipple & Union Material
C–Carbon Steel, G–Galvanized Steel, S–Stainless Steel

Nipple Sizes Process

4– 1/2” NPT; 6– 3/4” NPT, 8– 1” NPT or T/C SHEATH
L – Length in inches 1 Thermowell

Junction Pg. A-10

Element Pg. A-10 or A-8 NIPPLE NIPPLE

Assembly Style (If spring-loaded is desired, insert a “S” in front of the assembly style).
UNION COMPRESSION FITTING

1. To order an assembly complete with a thermowell or protecting tube, simply insert the part number of the thermowell or protecting tube desired from Section B of this
catalog. When ordering a complete assembly, the “L” (element) length should be shown as “00” (the element will be precisely matched to the thermowell or protecting tube).
2. When ordered without a thermowell assembly, Assembly Styles 1H, 2H, 3H, 4H and S5H are shipped unassembled to avoid damage in transit.
To order specfiy Sandelius Assembly Style “P1H” and complete the part number as indicated. (Note Assembly Style “P1H” cannot be spring-loaded).

A-6 Rev. 5
SANDELIUS INSTRUMENTS, INC.
Sandelius Style 4H –
L
Head Mounted directly
with a protecting tube.
(For spring-loading insert
an “S” in front of the style
number.
MEASURING
METAL SHEATH OR
JUNCTION
INSULATOR TYPE ELEMENT PROTECTING TUBE
HEAD OF
YOUR CHOICE

To Order Specify:
4H–250KK316–G–00–A46D–940SB-1/2–18–M316

Complete Protecting Tube Order Symbol (See Catalog Section B).

Head Pages A-18 & A-19
L — length matched to protecting tube
Junction Pg. A-10
Element Pg. A-10 or A-8
Assembly Style (when ordered without a protecting tube, the element and head are shipped unassembled to avoid damage in transit).

Sandelius Style 5H –
Head Mounted with a
Double Threaded Fitting L
(See Note 1 for
Spring-Loading Options).

MEASURING NON-SPRING LOADED FITTINGS

METAL SHEATH ARE BRAZED TO THE SHEATH HERE
JUNCTION

DOUBLE THREADED HEAD OF

To Order Specify: 1/2” NPT SS FITTING YOUR CHOICE

5H–188JJ304–RC–36–A44D

Head Pages A-18 & A-19

Length in inches
Junction Pg. A-10
Element Pg. A-10
Assembly Style (For spring-loading, see Note 1 below)

Notes: 1. Two different spring-loaded fittings are available for the style 5H assembly (see page A-17). Style “S5H” designates spring-loading
with the standard SF24 fitting. Style “SP5H” designates spring-loading with the O-ring sealed “SPF24” fitting.
2. When spring-loaded assemblies are ordered without a thermowell, the element and head may (depending on the length) be
shipped unassembled to avoid damage in transit.

Sandelius Style 6H –
Head Mounted with a
Single Threaded Fitting L

MEASURING
METAL SHEATH FITTING
JUNCTION

HEAD OF
To Order Specify: YOUR CHOICE

6H–063T304–R–26–CF11–A46B–

Options if any. Mounting Fittings Pg. A-16

Head Pages A-18 & A-19
Head Mounting Fitting Pg. A-16
L – Length in inches
Junction Pg. A-10
Element Pg. A-10 or A-8
Assembly Style

A-7 Rev. 5
INSULATOR TYPE ELEMENTS
INSULATOR TYPE THERMOCOUPLES
Insulator type thermocouple elements have been used since the turn of the century. When used inside a thermowell or protecting tube they can provide
reliable, low cost service in many applications. Extra care should be taken to protect insulator type elements from chemical contamination which can cause
erroneous readings to develop. Insulator type thermocouples can be shortened in the field in a matter of moments by simply removing one or more insula-
tors and cutting the conductors to the desired length.

TYPICAL SINGLE ELEMENT INSULATOR TYPE THERMOCOUPLE

L 2”
3/4”

MEASURING
JUNCTION INSULATORS FIBERGLASS SLEEVING

TYPICAL DUAL ELEMENT INSULATOR TYPE THERMOCOUPLE

L 2”
3/4”

MEASURING
JUNCTION INSULATORS FIBERGLASS SLEEVING

ORDER WIRE MAXIMUM INSULATOR OD AVAILABLE

SYMBOL GAUGE SINGLE ELEMENT DUAL ELEMENT CALIBRATION TYPES
BE20 20 .220” .220” E, J, K &T
BE16 16 .260” .312” E, J & K
BE14 14 .312” .312” E, J, K & T
BE8 8 .445” .645” E, J & K
To Order:
Complete the part number by inserting a single letter calibration symbol for single element or a
double letter calibration symbol for dual element and indicate the “L” length in inches.
EXAMPLES: BE14K–18, Type K, single element, L = 18”. BE14KK—18, Type K, dual element, L=18”.

PLATINUM INSULATOR TYPE THERMOCOUPLE ELEMENTS

Platinum insulator type thermocouple elements are available with either Mullite or high purity Alumina insulators. To minimize the possibility of silica
contaminiation, Alumina insulators are recommended for temperatures above 2400ºF (1316ºC). In either case, a single one-piece insulator is used on
elements 36 inches or less in length. The use of a one-piece insulator provides optimum support and protection for the delicate platinum conductors. As a
standard feature, platinum elements are terminated with copper sleeves. Copper sleeves provide a convenient, durable means of connecting platinum
elements to a connector block without damaging the soft, platinum conductor wires.

TYPICAL SINGLE ELEMENT PLATINUM THERMOCOUPLE

L 2”

COPPER
SLEEVE

MEASURING ONE PIECE

INSULATOR FIBERGLASS SLEEVING*
JUNCTION
TYPICAL DUAL ELEMENT PLATINUM THERMOCOUPLE
L 2”

COPPER
SLEEVE
MEASURING ONE PIECE
JUNCTION INSULATOR FIBERGLASS SLEEVING*

ORDER WIRE INSULTAOR MAXIMUM INSULATOR OD AVAILABLE

SYMBOL GAUGE MATERIAL SINGLE ELEMENT DUAL ELEMENT CALIBRATION TYPES
BP24M 24 Mullite .200 .200 R, S & B
BP24A 24 Alumina .200 .200 R, S & B

*Fish Spine beads may be substituted for the fiberglass sleeving at no extra charge.
To Order:
Complete the part number by inserting a single letter calibration symbol for single element or a double letter calibration
symbol for dual element and indicate the “L” length in inches.
EXAMPLES: BP24MS—18, Type S, single element, L = 18”. BP24MSS—18, Type S, dual element, L = 18”.

A-8 Rev. 5
SANDELIUS MULTI-POINT ASSEMBLIES
Any thermocouple assembly with measuring junctions located at more than a single immersion depth is commonly referred to as a multi-point. As the
number of variations possible in multi-point assemblies is virtually limitless, they are generally designed and manufactured to meet the requirements of
individual applications. As different multi-point designs vary tremendously, careful consideration should be given to such variables as the positive location
of measuring junctions and the ease/cost of replacement should a failure ever occur. Some designs allow for replacement of individual elements while
others require replacement of the entire assembly whenever individual elements fail. In either case, complete shut-down of the process line may not be
required depending on important design considerations. For easy reference, we have assigned style numbers to the most commonly used types of
multi-point designs. Other designs can be furnished on request. If you have any questions about multi-point designs or would like assistance in preparing
a multi-point specification, please feel free to contact us at your convenience.

The sketch below illustrates how multi-point assemblies which appear identical from outside, can be vastly different on the inside where it counts.

Terminations
Multi-point assemblies are usually terminated in junction boxes as shown here. Available in a variety of styles, materials and
classifications junction boxes provide a convenient means of wiring multi-point assemblies in the field. They can be equipped
with standard or compensating terminal strips. Swamping resistor networks used to provide average readings are also
available.

In other cases, multi-point assemblies can be terminated with flexible leadwire which is routed in the field to a remote mounted
junction box or instrument panel.Multi-pin connectors are a more rarely used option but one well worth considering in some
applications. Whatever termination style your prefer, Sandelius will gladly produce it for you.

Optional Secondary Seals

When requested secondary seals can be built into multi-point assemblies. A secondary seal prevents the escape of process
fluids or gases in the event the portion of the multi-point assembly in the process should develop a leak. Any of several
different types of seals are available. They are occasionally used in combination for even greater safety in hazardous
applications.
Process Mounting Fittings
Large multi-point assemblies almost always use a flange to connect to the vessel. Smaller assemblies sometimes use
threaded bushings, compression type fittings or other means of mounting. Whatever your application requires we will gladly
produce it for you.
Sandelius Style 1
Individual Free Hanging Type. Figure 1. Individual sheathed thermocouples are inserted into a common outer protecting tube.
This style is commonly used in small diameter tubes where the thermocouples fill the majority of the inside of the outer tube.
Fig. 1
Style 1 Sandelius Style 2
Permanently Bundled Free Hanging Type. Figure 2. The individual thermocouples use a common transition piece and are
attached together at regular intervals along their entire length. Individual thermocouples cannot be replaced. This design may
be used with or without an outer protecting tube.
Sandelius Style 3
Bundled Free Hanging Type. Similar to Figure 2 . The individual thermocouples are independtly transitioned and bundled
Fig. 2 together using removable tie wires or clamps. Individual thermocouples may be replaced only after removing the entire
Styles multi-point assembly from the vessel. This design may be used with or without a protecting tube.
2, 3 & 4
Sandelius Style 4
Individually Replaceable Bundled Free Hanging Type. Similar to Figure 2. In this design, individual guide tubes are
permanently bundled together and independent thermocouples are fed into them. Individual thermocouples may be replaced
without removing the entire assembly from the vessel. Note the guide tubes may be open ended allowing the thermocouples
AA to protrude directly into the process or their ends may be welded closed. This design may be used with or without an outer
Fig. 3A
Style 5 protecting tube.
Sandelius Style 5
Positive Contact Type. Figure 3A. In this design the thermocouples are attached to the protecting tube wall through the use
Fig. 3B of welded plugs. Exact positioning of each measuring junction is assured. Replacement requires a completely new assembly
Style 6
including the protecting tube. Please note this design requires an outer protecting tube.
Sandelius Style 6
Replaceable Positive Contact Type. Figure 3B. In this design, individual guide tubes are attached to the protecting tube
through the use of welded plugs. Individual thermocouples are then fed into the guide tubes assuring correct positioning of
the measuring junctions. Individual thermocouples may be replaced without shutting down the process. This design requires
the use of an outer protecting tube.

Fig. 4 Sandelius Style 7

Styles Full Leaf Spring Type. Figure 4. In this design the thermocouples are assembled around a center support strip. Each measur-
7, 8, 9, & 10 ing junction is attached to the top of one side of a pair of opposing full leaf springs. The springs hold the hot junctions to the
wall of the protecting tube. Individual thermocouples cannot be replaced.

Style 13 Sandelius Style 8

Same as style 7 with the addition of individual guide tubes allowing for the replacement of individual thermocouples.
Sandelius Style 9
Cantivelever Spring Type. Similar to Figure 4. In this design the thermocouples are assembled around a center support strip.
Each measuring junction is attached to the top of one side of a pair of opposing cantilever springs. The springs hold the hot
junctions to the wall of the protecting tube. Individual thermocouples cannot be replaced.
Sandelius Style 10
Fig. 5
Styles Same as style 9 with the addition of individual guide tubes allowing for the replacement of individual thermocouples.
11 & 12 Sandelius Style 11
Bimetallic Strip Type. Figure 5. This design is similar to Style 9 with the exception that temperature activated bimetallic strips
are used in place of the springs.
Sandelius Style 12
Same as style 11 with the addition of individual guide tubes allowing for the replacement of individual thermocouples.
Sandelius Style 13
Drawn or swaged multipoints are constructed by drawing or swaging an outer sheath over a thermocouple bundle. The
resulting assembly is small (usually 0.25” or less O.D.) tightly packed and flexible. The flexible nature of this design allows the
View AA assembly to be snaked around off-sets to measure points which cannot be reached by more traditional straight line designs.

A-9 Rev. 5
METAL SHEATH TYPE ELEMENTS

METAL SHEATH TYPE THERMOCOUPLE ELEMENTS

SANDELIUS NUMBERING SYSTEM
125 J 316

SHEATH O.D
IN 1000ths OF AN INCH CALIBRATION SYMBOL SHEATH MATERIAL

ORDER APPROXIMATE ORDER CONDUCTOR TEMPERATURE ORDER MATERIAL

SYMBOL FRACTION SYMBOL* MATERIAL RANGE SYMBOL
020 1/50 E Chromel / Constantan -328 - 1652ºF** 200 Nickel 200
032 1/32 J Iron / Constantan 32 - 1382ºF** 304 304SS
K Chromel / Alumel -328 - 2282ºF** 304L 304L
040 1/25 Platinum / Platinum 13% Rh 32 - 2642ºF 310 310SS
R
063 1/16 S Platinum / Platinum 10% Rh 32 - 2642ºF 310L 310L
125 1/8 B Platinum 6% Rh / 1598 - 3092ºF 316 316SS
316L 316L
188 3/16 Platinum 30% Rh 321 321SS
250 1/4 N Nicrosil / Nisil 32 - 2282ºF 347 347SS
T Copper / Constantan -328 - 662ºF** 400 Monel 400
313 5/16
* Single letter calibration symbol is used for single element. 446 446SS
375 3/8 A double letter calibration symbol is used for dual element. 600 Inconel 600
500 1/2 EXAMPLE: 125JJ316 is dual element type J. 601 Inconel 601
625 Inconel 625
** Type E, K & T may be used for cryogenic temperature as low 800 Incoloy 800
as -328ºF, but must be specifically ordered to insure accuracy in 276 Hastelloy C-276
cryogenic range. 277 Hastelloy X
285 Tantalum
337 Titanium Grade 2
928 Pyrosil

MEASURING JUNCTION STYLES

G-GROUNDED JUNCTION The conductors and sheath material are simultaneously cap welded. This
process forms a measuring junction which is an integral part of the end
cap and electrically grounded to the sheath. The most common junction
INSULATION SHEATH
style, grounded junctions protect the thermocouple conductors from
contamination and offer fast response times.
END CAP &
Order Symbol: G-Single or Dual Element
JUNCTION
CUT AWAY VIEW

The conductors are first junction welded together. Prior to cap welding the
R-REMOTE OR UNGROUNDED JUNCTION
sheath, the junction is covered with insulating material to insulate it from
the sheath and end cap. Remote junctions protect the thermocouple
INSULATION SHEATH conductors from both contamination and outside electrical interference.
They are used whenever electrical isolation of the element is desirable.
END
CAP Order Symbol: R – Single Element
RC* – Dual Element Common
JUNCTION CUT AWAY VIEW RS* – Dual Element Separate

E-EXPOSED JUNCTION The sheath material is stripped back slightly and the conductors are
welded together to form a measuring junction. The exposed insulation is
sealed against moisture penetration. Exposed junctions provide the
INSULATION SHEATH fastest possible response times but do not offer protection to the thermo-
couple conductors.
Order Symbol: E – Single Element
EC* – Dual Element Common
JUNCTION ES* – Dual Element Separate
CUT AWAY VIEW

* When ordering dual element remote or exposed junctions, a “C” indicates common junction (all four conductors
welded together forming a common junction); an “S” indicates separate junctions (each thermocouple element
independently junctioned and isolated from each other).

A-10 Rev. 7
FURNACE TUBE TEMPERATURE THERMOCOUPLES
Whenever a thermocouple must be welded in place it is advisable to use a weld pad and weld clips to protect against burn-through of the sheath material
during field installation. Sandelius weld pads, weld clips and weld pad covers are available in a wide range of styles and materials.
Standard W1, W2 and W3 style weld pads measure 3/4” x 3/4” x 1/8”. Inconel 600 or 310SS have proven to be excellent choices for most furnace applica-
tions. Other materials are available on request.

Sandelius
Style W2B

Material Designation
Add forming information

Sandelius Style W1D Flat Formed Formed so the thermocouple sheath wraps around the Sandelius Style W3C Tip Mounted Weld Pad
Material Designation process tube. The amount of arc desired as well as the tube
Add forming information as required size should be specified on your order. (Shown with a Fig. 1 Material Designation
If forming is specified, the thermocouple bend a=90º). Note “L” length of the T/C is measured from the
sheath will lay parallel to the process tube. center line of the tube.

Radial Weld Pad Cover

PN: CP725D-1/4-6”
120º
Material
Sandelius Style W5E Typical Weld Clip Sheath OD
Material Designation Furnace Tube OD
PN: CP710D-1/4
Add forming information as required W6E Parallel Weld Pad Cover
Material Note:
PN: CP720D-1/4-4” CP725 is 1 3/8” high
Wedge-Shaped Weldment Sheath OD
Material CP726 is 3/4” high
This design offers an alternative to the traditional weld pad
for 0.375” or larger diameter sheath sizes. It incorporates a Material Designations Sheath OD
specially shaped weldment to keep the thermocouple A=316SS D=310SS Furnace Tube OD
junction in contact with the furnace tube surface. (W6E is B=Inconel 600 E=446SS All Sandelius weld pad covers are supplied packed with
shown with a Fig. 1 bend a=90º). C=304SS Y=Other as Specified insulation suitable for use up to 2300ºF. Covers should be
welded in place with insulation left inside.

TYPICAL WELD PAD INSTALLATION AND EXPANSION LOOPS

Bending and expansion loops are best specified by sending a drawing or sketch with your order. The following are examples of commonly used
configurations. Many other configurations are available. Expansion loops are normally designed to open with furnace tube movement.

2 2 T/C Junction
M1 or “M1” Point
B or C 4 4 M1
4 a 1 1 LC C=140”
1
B
1
a a
120
1 1
Furnace 3
Tube OD 2 3 3 Furnace
4 4
Fig. 1 Junction Bend Tube
M1 M1 C OD=4”
M1 D 4 2
B or C 1 1 D
4 a 4
Lc
3 3 3
1
B or C B or C
M1
5 5
Furnace Fig. 4L Fig. 4R 3
Tube OD 2
5 5 (Expansion Loop (Expansion Loop
on Left Side) on Right Side)
Fig. 2 Junction Bend Fig. 3L Junction Bend Fig. 3R Junction Bend Expansion Loops 1
12”
Legend 5
1
L = The total straight length of the thermocouple sheath before bending as Example A
showin in the drawing of each assembly style on pages 2-7. In assemblies Junction BendL Fig. 1, a=120º
including expansion loops and/or bends, this length should be specified as Tube OD=4”
“00” in the part number allowing is to make the necessary calculations. Expansion Loop: Fig. 4R,
2 Lc Lc = The “point of measurement” toward the “cold” or reference end of the D=12”, 4 Coils, B=0, C=140”
3
5 sheath. “L”c is constant as shown in the drawing of each assembly style on
pages 2-7. a = Degrees of arc in a bend.
C=90” D = The outside diameter of a
M1 = The first “point of measurement” back from the “hot” or measuring
D=8” junction end of the thermocouple. On a straight assembly with no bends M1 circular expansion loop.
= Lc . On assemblies incorporating one of more bends M 1 and subsequent 1 - Thermocouple sheath
B=18” points of measurement will vary with the type of bend as indicated in the 2 - Weld pad
figures above.
3 - Weld clip
M1 B = The straight length of sheath between the center of an expansion loop 4 - Weld pad cover
Example B and next measuring point toward the “Hot Junction”, usually “M1”. (Used
only when an expansion loop is specified. If no expansion loop is specified (Dotted for clarity)
Junction Bend: Fig. 3R, a=90º, Tube OD=6” “B” is left blank). 5 - Correct view to determine R
Expansion Loop: Fig. 4L, D=8”, 1 Coil C = The straight length of sheath between “Lc” and the first “point of (right) or L (left) side orientation
B=18”, C=90” measurement” encountered; usually either the center of an expansion loop of an expansion loop.
or M1.
Ordering Information To order an assembly with an expansion loop, bend or both add a description of the loop
First select a thermocouple assembly from pages 2-7 of this catalog. Complete the and bending required.
part number for the assembly desired and add the weld pad designation to the end Example: 3T-250K600-G-00-P1-6-W2B Junction bend for Fig. 3R (a=180),
of the part number. Expansion loop per Fig. 4L, D=12”, 3-Coils, B=15”, C=96” (Note in this expample
Example: 1A-250K310-G-120-S3-W1D formed to fit 4” OD tube. the length is specified as “00” allowing us to calculate the material required).

A-11 Rev. 4
THERMOCOUPLE WIRE
To Order Specify
1. ANSI Calibration from column #1.
2. B&S gauge size from column #2.
3. Insulation type from column #3.
4. Add “SS” if stainless steel overbraid is desired.

Examples: KX20-P1, J20-G1, K20S-G1-SS, EX20-P6-8

The items listed below represent the most commonly used types of
thermocouple and extension wire. If you do not find the item you require,
please call as many other gauge sizes and insulation types are available.

COLUMN #1 #2 #3 INSULATION TYPE INSULATION CHARACTERISTICS

Insula- PRODUCT Continuous Physical Properties
ANSI B&S Conductor Overall
tion Operating Abrasion Moisture
Calibration Gauge* Insulation Jacket
Type Temperature Resistance Resistance

JX, KX, TX 16
JX, KX, EX, NX PVC PVC 221ºF Good Excellent
TX, SX/RX 20 P1
JX, KX, TX 20S*

JX, KX 16 P1UL Same as P1 except UL listed for PLTC

JX, KX, TX 20 (Power Limited Tray Cable) - 300 Volts

Aluminum/
JX, KX, TX 16 P4 PVC Mylar
JX, KX, EX, NX 20 Twisted Shield w/ 221ºF Good Excellent
TX, SX/RX Pair Drain wire &
PVC Jacket

JX, KX 16 P4UL Same as P4 except UL listed for PLTC

JX, KX, TX 20 (Power Limited Tray Cable) - 300 Volts

Fused
Kapton
Fused
Tape with
J, K, T, E 20S* K1 Color Kapton 500ºF Excellent Excellent
Tape
Coding
Thread

Colored
Fused
Fused
J, K, T 20 K4 Kapton
Kapton 500ºF Excellent Excellent
Tape
Tape

Extruded
J, K, T, SX/RX, E 20 T1 Extruded
FEP Teflon 400ºF Excellent Excellent
J, K 20S* FEP Teflon

J, K, T, E 20 T2 Fused Teflon Fused Teflon

500ºF Good Excellent
Tape TFE Tape TFE

JX, KX 16 Impregnated Impregnated

J, K, E, N, T, SX/RX, BX 20 G1 FIberglass FIberglass 900ºF Fair Good
J, K 20S* Braid Braid

Aluminum/
PVC Mylar
Twisted Shield w/ 221ºF Good Excellent
JX, KX, TX, EX 20 P6-#PR Pair Drain wire &
PVC Jacket

PVC
Twisted
Pair with Aluminum/
Aluminum/ Mylar
Mylar Shield w/ 221ºF Good Excellent
JX, KX, TX, EX 20 P7-#PR Shield & Drain wire &
Drain wire PVC Jacket
over each
pair

A-12 Rev. 4
MINIATURE BEARING TEMPERATURE SENSORS
These sensors are used to provide continuous temperature monitoring of bearing shoes and housings. This information can be used as
an early warning of bearing failure or other internal problems. Temperature range is up to 500ºF. Case material: Plated Copper.

B2 Style Babbit Layer

L
Temperature Sensor
C max. Retainer Clip
Spring (PN: CP910B)
D (PN: CP910C)
SINGLE STYLES B1, B3, B4, B5
DUAL1 STYLES B11, B31, B41
Bearing Shoe
Leadwire
.311
L .313
C max. Diameter Bore
To Order specify:
D B2–J–24S–G–24–T2–SS
Add “SS” if stainless steel
DUAL STYLE B12, B32, B42
2
overbraid is desired
Leadwire Insulation
T2 = Fused Teflon Insulation &
L
Jacket (most common choice)
0.250 max. T1A = Extruded Teflon Insulation
with No Overall Jacket
D Other wire types are available on request
0.188 SINGLE STYLE B2 Length in inches
0.250 0.005 DUAL1 STYLE B21 G = Grounded Junction; R = Ungrounded Junction
Wire Gauge add “S” for stranded
L (24S = 24 ga. stranded) (most common choice)
0.250 max. T/C Type E, J, K, or T. (Use double letter for dual element)
Case Style
D
Available Wire Sizes: S=Single; D=Dual
0.188 Case
0.250 0.005 DUAL2 STYLE B22 Style
3
“D” “C” 20 ga. 24 ga. 30 ga.
B1 .275+.003 .250 max. S&D S&D S&D
NOTES:
B3 .125+.003 .300 max. S S&D S&D
1. Dual styles B11, B21, B31 and B41 have both leads under a single overbraid.
2. Dual styles B12, B22, B32 and B42 have two individial (separate) leads. B4 .250+.003 .300 max. S&D S&D S&D
3. Case style of dual element sensors is determined by the first digit of the
style number.
B5 .080+.003 .300 max. – – S

INSULATED WIRE & WASHER TYPE THERMOCOUPLES

Sandelius Style 1M - Insulated Wire Type Thermocouple To Order a 1M specify:
1M–K–T1–60–M1
L
Optional Termination Style (See pg. A-5)
Length in inches
Insulation Wire Choice (See pg. A-12)
Calibration Symbol J, K, T, or E
Assembly Style

Welded 20 ga. Insulated thermocouple wire

Junction (Other gauges available on request) To Order a 2M specify:
2M–3/8x1x1/8–K–T1–60–M1
Optional Termination Style
(See pg. A-5)
Sandelius Style 2M - Washer Type Thermocouple Length in inches
L Insulation Wire Choice (See pg. A-12)
Calibration Symbol J, K, T, or E
Junction welded into washer Washer size I.D. x O.D. x Thickness (Note: Unless
otherwise specified, washers will be made of stainless
steel.) If an eyelet is required, specify a part number or
description of the eyelet required.
Assembly Style
20 ga. Insulated thermocouple wire
Washer
(Other gauges available on request) *NOTE:
For use in severe applications where insulated wire does not provide
sufficient protection for the thermocouple, washers may be added to
metal sheath type thermocouples. To order complete steps 1-3 above
and put this information in front of the part number of the sheathed type
thermocouple of your choice from pages A-2 through A-7.

A-13 Rev. 4
SANDELIUS INSTRUMENTS, INC.
THERMOCOUPLES FOR THE PLASTICS INDUSTRY
Sandelius Style 1F – Universally Adjustable Bayonet Type Thermocouple
The bayonet cap on our universally adjustable bayonet type thermocouples is designed to thread onto the specially sized stainless-steel flexible
armor. This feature allows the bayonet cap to be adjusted to any immersion depth required. When properly adjusted, the spring action of the
compressed flexible armor holds the bayonet cap in position and forces the thermocouple junction to securely bottom out in the hole.
Maximum continuous operating temperature is 900ºF (482ºC).

B 4” To Order specify:
A 1. Assembly style
2. Calibration symbol J, K, E, or T
3. A - Length in inches
4. Junction style. See page A-10
5. B - Length in inches
3/16” 0.285” maximum
6. Termination style. See page A-5
MEASURING JUNCTION ADJUSTABLE FLEXIBLE STAINLESS FIBERGLASS
BAYONET CAP STEEL ARMOR INSULATED LEADWIRE EXAMPLE: 1F–J–1/2–G–36–BX
1 2 3 4 5 6
SHOWN WITH OPTIONAL
TERMINATION STYLE BX

Assembly Style 2F – Adjustable Bayonet Type

1 3/4”
Maximum Operating Temperature 900ºF (482ºC)
E

A 2 1/4” E 45º ANGLE TYPE

A
k
1 3/4”
+
E

SS TUBE BAYONET FITTING FLEXIBLE STAINLESS

1/8” or WITH ADJUSTABLE STEEL ARMOR SHOWN WITH OPTIONAL
3/16” O.D. SPRING TERMINATION STYLE M1 90º ANGLE TYPE

STRAIGHT TYPE

A
To Order See Below:

Assembly Style 3F – Threaded Compression Fitting Type

Maximum Operating Temperature 900ºF (482ºC) 1 3/4”
E
A E 4”
A

45º ANGLE TYPE

1 3/4”
E
SS TUBE 1/8” NPT BRASS FLEXIBLE STAINLESS FIBERGLASS
1/8” or COMPRESSION STEEL ARMOR INSULATED LEADWIRE
3/16” O.D. FITTING 90º ANGLE TYPE
STRAIGHT TYPE SHOWN WITH OPTIONAL
A

TERMINATION STYLE BX

To Order See Below:

To Order any 2F or 3F Assembly specify:

1. Assembly Style
2. Probe diameter. 125 for 0.125” (1/8“) or 188 for 0.1875” (3/16”)
3. Angle O-Straight 45-45º angle or 90º-90º angle EXAMPLE: 2F–188–0–J–6–G–48–M1
4. Calibration symbol J, K, E or T
1 2 3 4 5 6 7 8
5. A - Length in inches
6. Junction style: G for grounded or R for ungrounded
7. E - Length in inches
8. Termination style. See page A-5

A-14 Rev. 3
SANDELIUS INSTRUMENTS, INC.
EXTRUDER BOLT TYPE THERMOCOUPLES
Sandelius Style 1E – Extruder Bolt Type with No Leads
Sandelius Type 1ET – Same with the addition of a small teflon insert at the tip* To Order specify:
1. Assembly style
A B E 2. A - Length in inches
3. ISA Calibration symbol – J, K, E or T.
2 7/8” 5/8”
NOM For dual element use a double calibration.
1/4” Example: JJ
4. B - Length in inches (Standard B lengths
are 3” and 6”. Other lengths are available
on request.)

k
+ 5. Junction style. See page A-10
6. E - Length in inches
1/2-20 N.F. THREAD HEX 1/8” O.D. QUICK
STAINLESS DISCONNECT EXAMPLE: 1E–1/8–JJ–6–G–0
SEE DETAIL A STAINLESS STEEL STEEL PLUG
EXTRUDER BOLT SHEATH
1 2 3 4 5 6

Sandelius Type 2E – Extruder Bolt Type with Flexible Leads

Sandelius Type 2ET – Same with the addition of a small teflon insert at the tip*
To Order specify:
1. Assembly style
A B E 2. A - Length in inches
3. ISA Calibration symbol – J, K, E or T.
2 7/8” 5/8”
NOM For dual element use a double calibration.
1/4” Example: JJ
4. B - Length in inches (Standard B lengths
are 3” and 6”. Other lengths are available
on request.)

k
+ 5. Junction style. See page A-10
6. E - Length in inches
7. Termination style. See page A-5
1/2-20 N.F. THREAD HEX STAINLESS SHOWN WITH OPTIONAL
SEE DETAIL A STEEL TERMINATION STYLE M1
STAINLESS STEEL ARMOR EXAMPLE: 2E–1/4–J–3–G–48-M1
EXTRUDER BOLT
1 2 3 4 5 6 7

DETAIL A DETAIL A
STYLES 1E & 2E STYLES 1E & 2E

0.420
45º 0.312 1/8” 45º 0.312 1/8”

TEFLON *NOTE:
0.420 INSERT The teflon insert used on styles 1ET and 2ET help to
SILVER SOLDER SILVER SOLDER prevent plastic from building up on the bolt tip.

HIGH PRESSURE THERMOCOUPLE ASSEMBLIES

Almost all thermocouple assemblies intended for use in high pressure applications are custom manufactured to precise customer specifications. Over the
years, we at Sandelius have manufactured many different types of high pressure thermocouple assemblies. We maintain a pressure testing setup, capable
of performing tests of up to 80,000 PSI. The assemblies shown below are typical high pressure designs. Whether you have an existing design or would like
to develop a new high pressure thermocouple specification, we would appreciate the opportunity to quote on your requirements.

TYPICAL HIGH PRESSURE CONE NIPPLE SPECIAL METRIC HIGH PRESSURE

THERMOCOUPLE ASSEMBLY THERMOCOUPLE ASSEMBLY

CHOICE OF
TERMINATIONS

THERMOCOUPLE CHOICE OF
THERMOCOUPLE GLAND TERMINATIONS
SHEATH
SHEATH NUT
COLLAR
SPECIAL METRIC
THREADED HIGH PRESSURE FITTING
CONE CHOICE OF
NIPPLE TERMINATIONS

THERMOCOUPLE
TYPICAL HIGH PRESSURE LENS RING SHEATH
THERMOCOUPLE ASSEMBLY
LENS RING

A-15 Rev. 3
ACCESSORIES

BAYONET TYPE FITTINGS AND ADAPTERS

A

BAYONET FITTING ADJUSTABLE BAYONET FITTING

Order Symbol: FB2B (with Brass Ferrule)
ORDER FB2N (with Nylon Ferrule)
DESCRIPTION FB2T (with Teflon Ferrule)
SYMBOL
FB1 Bayonet Cap with spring stop brazrd to sheath. Designed for use on 0.125” diameter sheath material. This fitting
Can be used on either 1/8” or 3/16” diameter. incorporates a compression type mounting feature. If nylon or
Teflon ferrules are used, the fitting may be re-positioned as needed.
FB4 Bayonet Cap with adjustable swage type spring.
For use on 1/8” diameter probes.
FB5 Bayonet Cap with adjustable swage type spring.
For use on 3/16” diameter probes.

PIPE STRAP BAYONET ADAPTER

Order Symbol: FP – 4 – 2
1/8” NPT
L Length (in inches)
Std. L=2”
STANDARD BAYONET ADAPTER Actual Tube or
Order Symbol: BA–(L) Pipe O.D. (in inches)
Standard Lengths 7/8”, 1 1/2”, 2 1/2” and 3 1/2”. Other lengths
and special thread sizes are available on request. Pipe strap adapters are available to fit any size tube or pipe. They provide
an excellent means to achieve surface temperature measurements while
allowing for easy replacement of thermocouple probes.

COMPRESSION FITTINGS
THREAD AVAILABLE TO FIT THESE
SINGLE THREADED ORDER SYMBOL* NPT SIZE MATERIAL SHEATH O.D. SIZES

CB11 1/8” Brass 0.063”, 0.125”, 0.188”, 0.250”

CF11 1/8” Stainless Steel 0.063”, 0.125”, 0.188”, 0.250”
CB12 1/4” Brass 0.063”, 0.125”, 0.188”, 0.250”, 0.312”, 0.375”
CF12 1/4” Stainless Steel 0.063”, 0.125”, 0.188”, 0.250”, 0.312”, 0.375”
CB13 3/8” Brass 0.125”, 0.250”, 0.312”, 0.375”
CF13 3/8” Stainless Steel 0.125”, 0.250”, 0.312”, 0.375”
CB14 1/2” Brass 0.125”, 0.250”, 0.375”, 0.500”
CF14 1/2” Stainless Steel 0.125”, 0.188”, 0.250”, 0.375”, 0.500”
CB16 3/4” Brass 0.250”, 0.375”, 0.500”
CF16 3/4” Stainless Steel 0.250”, 0.375”, 0.500”

Readjustable compression fittings with Teflon sealant ferrules are available upon request. When ordering fittings with Teflon ferrules, simply
add a “T” after the order symbol. Example: CF14T-250. When an “1/8” vent hole is required add a “V” after the order symbol. Example CF14V-250.

*When ordering fittings as a part of an assembly, the order symbol alone includes all the information required as the fitting will be sized to
match the assembly. When ordering fittings separately, the sheath O.D. size must be included. Example: CB12-250. Other materials available
upon request.

A-16 Rev. 7
ACCESSORIES
FIXED FITTINGS – ARE BRAZED OR WELDED TO THE SHEATH
STYLE 1 STYLE 2
“I” SINGLE THREADED “I” DOUBLE THREADED

ORDER SYMBOL
THREAD SIZE MATERIAL AVAILABLE TO FIT THESE SHEATH O.D. SIZES
STYLE 1 STYLE 2
F11 F21 1/8” NPT 304SS 0.063, 0.125, 0.188 & 0.250
F12 F22 1/4” NPT 304SS 0.063, 0.125, 0.188, 0.250, 0.313 & 0.375
F14 F24 1/2” NPT 304SS 0.063, 0.125, 0.188, 0.250, 0.313, 0.375 & 0.500
F16 F26 3/4” NPT 304SS 0.063, 0.125, 0.188, 0.250, 0.313, 0.375 & 0.500
F18 F28 1” NPT 304SS 0.063, 0.125, 0.188, 0.250, 0.313, 0.375 & 0.500

SPRING-LOADED FITTINGS
STYLE 1 – SINGLE THREADED STYLE 2 – DOUBLE THREADED

ORDER SYMBOL THREAD

MATERIAL SPRING TYPE AVAILABLE SHEATH SIZES
STYLE 1 STYLE 2 NPT SIZE
SF14 SF24 1/2” NPT 304SS Adjustable 0.125, 0.188, 0.250, 0.312 & 0.375
SB14 – 1/2” NPT BRASS Adjustable 0.125, 0.188, 0.250, 0.312 & 0.375
SPF14 SPF24 1/2” NPT 304SS Adjustable with 0.125, 0.188 & 0.250
Liquid-tight O-Ring

Screw Cover

2 1/8” r
ve
Co
w
re /4”
Sc 2 1
1 1/2”
1/4” NPT Conduit
Opening

1/4” NPT

2 3/4”
Process
Opening

Miniature Aluminum Head (Type M) Ceramic Terminal Blocks

Part Number: M44* (1/2” x 1/2” NPT) Fit Miniature Head Type: M
(Use “120” Series Terminal Blocks) Part Number Description
Max No. of Terminals: 4 + Ground
CP122 2 - Terminals
*See note on page A-18
CP124 4 - Terminals
Miniature Weatherproof
Thermoset Plastic Head
1/4” NPT x 1/4” NPT with 4
Integral Terminals

Part Ambient
Number Temperature Rating
N22 350º F
W22 800º F

A-17 Rev. 6
 TERMINAL HEADS & CONNECTOR BLOCKS
r
ve
ve
r Co
er w
v Co ” re 2”
Co 6” w / 2 Sc 1/
w 1 re 1 3
re 1/ Sc 3
Sc 3
4 3/4”
Conduit Conduit
Opening Opening
Conduit
Opening
3 3/16” 4”

Process Process Process

Opening Opening Opening
Standard Weatherproof Heads Large Weatherproof Heads Large Dome Cover Weatherproof Heads
(Use “162F Series” Ceramic Terminal Blocks) (Use “162 Series” Ceramic Terminal Blocks) (Use “162 Series” Ceramic Terminal Blocks)
Max. number of terminals: 6+Ground. Max. number of terminals: 6+Ground. Max. number of terminals: 6+Ground.
Part Number1 Type Description Part Number1 Type Description Part Number1 Type Description
P46* P Polypropylene A46* A Aluminum D46* D Cast Iron
PW46* PW White Polypropylene 2 C46* C Cast Iron
(FDA Compliant)
Screw Cover
Q46* Q Aluminum 4”
R46* R Cast Iron

2 1/8”
Ref. 3 1/2” Conduit
Opening

7/32”
Process Opening
e r 3
Large Explosion Proof Heads
C ov 1 1/2”
mp (Standard Terminal Block is CP129)
Cl a 3 ” Ref.
Max No. of Terminals: 6 + Ground
Part Number1 Type Description
E46* E Aluminum
5
F46* F Cast Iron/Aluminum
3 5/16” Conduit 3/8”
Opening
To Order Any Head On This Page
163 Series Ceramic terminal blocks C46B
Fits All Heads, must be used for 8g- wire Connector block if required.
CP129 (3/8” spacing) is standard in E & B – 2 Terminals C – 3 Terminals
Process Opening
CP129 (3/8” spacing) is standard in E & D – 4 Terminals F – 6 Terminals
Weatherproof Aluminum Head Conduit Opening (See table A below)
(Use “162 Series” Terminal Blocks) Process Opening (See table A below)
Max No. of Terminals: 6 + Ground Head Type
If a tapped internal ground screw is required insert
Part Number1 Type Description Part Number Number of Terminals a “G” in front of the part number.
H44* H 1/2” x 1/2” NPT CP163B 2
H46* H 1/2” x 3/4” NPT CP163D 4 Table A -Connection
7
Sizes (All heads on this page)

NPT ORDER Available on Head Types

SIZE CODES PROCESS CONDUIT
1/2 4 All All
3/4 6 All except H+P All
1 8 ABCDEF&R E&F

Notes:
* To order heads complete with terminal block add suffix to
specify the number of terminals required B=2 terminals,
C=3 terminals, etc.
CP140 Tubular Clamp Type Terminal Strip 1. Unless otherwise noted, all head part numbers shown are for
CP129 & CP130 Terminal Strips heads with 0.5” NPT process openings and 0.75” NPT conduit
CP129 (3/8” spacing) is standard in E & Commonly used in junction boxes. May be
openings. See Table A for other available sizes.
F type heads. specified as an option for E & F type heads.
2. PW series heads may be specially ordered with
CP130 (7/16” spacing) available with To Order Specify molded-in terminals. To order insert an “M” before the number
compensated terminals is commonly used CP140–10 of terminals required. Example: PW46MF would have 6
in junction boxes. molded-in terminals.
Number of Terminals
3. Type E & F explosion proof heads are approved for Class 1,
Part Number Groups B, C, & D; Class 2, Groups E, F & G; Class 3, All
To Order Specify Groups.
CP130–12–K 4. Type F & T explosion proof heads have cast iron bodies with
Type of Optional aluminum covers.
Compensated Terminals 5. Aluminum & Cast Iron heads are available with epoxy coating
add an “X” after the type designation. Example: QX46D.
(Available on CP130 only)
6. Some NPT sizes are achieved through the use of reducing
Number of Terminals (20 max.) bushings.
Part Number

A-18 Rev. 6
TERMINAL HEADS & CONNECTOR BLOCKS

SS Chain
37
/16
”

To Order Specify
AE–46–D
Standard Terminal Block
B – 2 Terminal Block (CP162B)
C – 3 Terminal Block (CP162C)
D – 4 Terminal Block (CP162D)
F – 6 Terminal Block (CP162F)
Leave blank if no Terminal Block
Connection Code
(See Table B)
Conduit 3 3/4”
Opening Basic Part Number
(See Table A)

Process
Opening

Table B – Connection Code

TABLE A - Basic Part Numbers Code Process Opening Conduit Opening

Part Number Material 44 1/2” NPT 1/2” NPT

AE Aluminum, Explosion Proof 45 1/2” NPT M20 x 1.5

AEX Epoxy Coated Aluminum, Explosion Proof 46 1/2” NPT 3/4” NPT

SE 316SS, Explosion Proof 66 3/4” NPT 3/4” NPT

FM/CSA APPROVALS:
CLASS 1, DIV. 1, GROUPS B, C & D and
Dust Ignitionproof for Class II, Div. 1,
Group E, F and G, Class III
2" Type 4X and IP68

II 2 G Ex d IIC Gb Ta, IP68

Ex II 2 D Ex tb IIIC Db Ta, IP68

IECEx Approvals:
Ex d IIC Gb
Ex tb IIIC Db

Part Number Number of Terminals

CP162B 2
CP162C 3
CP162D 4
CP162E 5
CP162F 6

REVISIONS Sandelius Instruments, Inc.

NOTICE - CONFIDENTIAL INFORMATION NO. DATE BY 713.861.1100 www.sandelius.com
This document and all information contained 1.
herein are the property of Sandelius Instruments TERMINAL BLOCK
2.
Inc. and is furnished in strickt confidence.
DRAWN BY SCALE MATERIAL
Recipients agree not to duplicate or disclose 3. TJM NTS Noted
this document, in whole or part, to others CHK’D DATE DRAWING NUMBER
4. 2/17/16
without written permission and shall return this
TRACED APP’D CP163
document upon request. 5.

A-19 Rev. 6
SANDELIUS R.T.D. ASSEMBLIES
Sandelius offers a complete line of quality RTD assemblies available in both “standard” and “cut-away” configurations. In the standard configuration the leads are
epoxy sealed where they exit the sheath. This results in a more rugged and moisture resistant probe. Standard configuration probes must be ordered to the exact
lengths required as they cannot be shortened in the field. The cut-away configuration has leadwire passing through a hollow sheath to the RTD bulb. The resulting
assembly can be shortened to any length down to a 3-inch minimum by carefully cutting off a section of the hollow sheath and adjusting the wire length to suit. While
not quite as rugged as our standard RTD configuration cut-away assemblies offer the advantage of eliminating the need to stock a different spare for each probe
length used in your plant.

L E
Style R1A – Epoxy sealed RTD probe
Style CR1A1– Cut-to-length RTD probe

L E
Style SR1A – Epoxy sealed RTD probe with spring
Style SCR1A1– Cut-to-length RTD probe with spring

L E

Style R1T – RTD probe with transition fitting and leadwire

L E

Style R2T – RTD probe with transition fitting and SS overbraid

L E 6”
Style R4T – RTD probe with transition fitting and SS armor
Style R4TP – Same as R4T with PVC coated SS armor
Style R4TT – Same as R4T with Teflon coated armor

Style R6T – RTD probe with transition fitting and SS armor

L E 2” 6” A 2-inch SS tube is brazed into the end of the armor
to allow the use of a compression fitting to connect
a head or transmitter
Style R6TP– Same as R6T with PVC coated armor
Style R6TT– Same as R6T with Teflon coated armor

Style R5B – RTD probe with standard 3-pole plug

+

L 6”
Style R5H – RTD probe with 1/2” x 1/2” npt SS mounting
Fitting brazed to sheath
Style RW5H – RTD probe with 1/2” x 1/2” npt SS mounting
Fitting welded to sheath

L 6” Style SR5H – RTD probe with spring loaded 1/2” x 1/2” npt
SS mounting fitting
Style SCR5H1– Same as SR5H with cut-to-length probe
Style SPR5H – RTD probe with liquid tight spring-loaded
1/2” x 1/2” npt SS mounting fitting

To Order specify: NOTES:

1. Cut-to-length RTDs are not available in the “M” high
SR1A–4A3EL–L22–E4–OPTIONS temperature range.
2. Standard leadwire insulation on RTD probes are as follows:
Assembly Element L– E– Heads pgs. A-18 & A-19 “L” Range – Teflon “K” Range – Kapton “F” Range – Fiberglass
style above Pg. A-21 Length Length Fittings pgs. A-16, A-17 “M” Range – Teflon “C” Range – PVC
(in inches) (in inches)
Terminations pg. A-5 3. If your application requires bending in the field, an “M” series
Copper Tip, see note 4 RTD probe should be specified. We do not recommend field
bending of any other RTD series.
4. Most 0.215 & 0.25” diameter RTD probes can be supplied
with a copper insert tip for faster response and better tip
sensitivity. To order specify CP909B at the end of the part
number.

A-20 Rev. 6
SANDELIUS R.T.D. ASSEMBLIES
Style R1H – RTD with Nipple - Union - Nipple - Head
RTD Leadwire Configurations
Style SR1H – Spring-Loaded RTD with Nipple - Union - Nipple - Head
Red White
“L” “A”

SHEATH UNION

RTD PROBE 2-Wire RTD

OPTIONAL NIPPLE NIPPLE
THERMOWELL

HEAD OF YOUR CHOICE White Red Red

Style R2H – RTD with Nipple - Head

Style SR2H – Spring-Loaded RTD with Nipple - Head

“L” “A”
3-Wire RTD
SHEATH

Red Red White White

RTD PROBE OPTIONAL NIPPLE
THERMOWELL

HEAD OF YOUR CHOICE

Style R7H – RTD with Nipple - Union - Brazed SS Fitting - Head 4-Wire RTD
Style SR7H – RTD with Nipple - Union - Spring-loaded SS Fitting - Head

“L” “A”
Red Red White White Blue Blue
SHEATH UNION

RTD PROBE OPTIONAL NIPPLE SS HEX

THERMOWELL FITTING Special 4-Wire with
Compensation Loop
HEAD OF YOUR CHOICE

To Order specify:
SR7H–4A3EL–L16–4G6–C46C–(Optional Thermowell*)
Assembly Element L– Head See Catalog Section B-2 * To order an assembly complete with a thermowell simply insert the part
number of the thermowell from Sandelius catalog Section B. When ordering
Style See Length See Pages
an assembly complete with a thermowell, the “L” length may be shown as
Below in inches A-18 & A-19
Nominal A “00” as we will size the element to fit the thermowell.
Thread Size Nipple & Union Material Length in inches
4 – 1/2” NPT C – Carbon Steel
6 – 3/4” NPT G – Galvanized Steel
8 – 1” NPT S – Stainless Steel

HOW TO SPECIFY RTD ELEMENTS

Temperature Range 2 3

/ Construction
RTD Type L – -328º 4 -500º F with
Sheath
Teflon wire
Diameter E- Platinum 100 @ 0º C. α = 0.00385 – Single K – -328º 4 -700º F with
2 – 1/8” EE - Platinum 100 @ 0º C. α = 0.00385 – Dual Kapton wire
Sheath Material Number of Wires
3 – 3/16” A- Platinum 100 @ 0º C. α = 0.003916 – Single M – -328º 4 -1000º F MgO
per Element AA - Platinum 100 @ 0º C. α = 0.003916 – Dual
4 – 1/4” A – 316SS with Teflon leads
6 – 3/8” B – Inconel 600 2 – Two Wire B- Platinum 100 @ 0º C. α = 0.003902 – Single C – -20º F -200º F with
7 – 0.215” C – 304SS 3 – Three Wire P- Platinum 100 @ 0º C. α = 0.003926 – Single PVC wire
4 – Four Wire R- Platinum 100 @ 0º C. α = 0.003911 – Single (Recommended for
5 – Four Wire Special W- Platinum 100 @ Sama Curve – Single cooling water)
Compensation Loop N- Nickel 120 @ 0º C. Single F – 50º-700º F with
Notes: C- Copper 100 @ 25º C – Single Fiberglass wire
Y- Other (Specify at end of part number) H – -328º 4 -1200º F MgO
1. Alpha = 0.00385 is the DIN 43760 standard and is the most commonly used.
2. Not all items for which a part number can be made are available in actual fact. with Teflon leads, H
3. The temperature ranges shown are for platinum RTDs. range comes standard
4. Sandelius RTDs are normally manufactured for use at temperatures above -140º F. If an RTD is intended with Inconel 600
for use at temperatures below -140º F, this information must be specified on the order so the necessary sheath material
modifications can be incorporated. (In very special cases, temperatures as low as -434º F are possible).

A-21 Rev. 6
 CATALOG SECTION B

Thermowells

WWW.SANDELIUS.COM

Over 55 Years of Thermowell Experience

Thermowells in each category are available
in straight, tapered and stepped styles.

INDEX
Pg.
Clamp Joint .............................................................................................................. B-9
Flanged .................................................................................................................... B-5
Ground Joint ............................................................................................................ B-8
Limited Space .......................................................................................................... B-4
Material Designations .............................................................................................. B-2
Optional Features .................................................................................................... B-2
Protecting Tubes ...........................................................................................B-10, B-11
Screwed ........................................................................................................... B-3, B-4
Socket Weld ............................................................................................................. B-7
Van Stone .................................................................................................................B-6
Weld-in ..................................................................................................................... B-7

Sandelius Instruments, Inc.

Tel: 713.861.1100
800.847.5742
Physical Address: Fax: 713.861.9136 Mailing Address:
1407 W. Patton Street Web: www.sandelius.com PO Box 30098
Houston, Texas 77009 Email: info@sandelius.com Houston, Texas 77249-0098

Rev. 8 • 10.2012
SANDELIUS THERMOWELLS

MATERIAL DESIGNATIONS FOR SANDELIUS THERMOWELLS

ORDER ORDER ORDER
CODE MATERIAL CODE MATERIAL CODE MATERIAL
M304 304 Stainless Steel MF5 Alloy Steel A182-F5 M601 Inconel 601
M304L 304L Stainless Steel MF9 Alloy Steel A182-F9 M602 Inconel 602
M304H 304H Stainless Steel MF11 Alloy Steel A182-F11 M617 Inconel 617
M309 309 Stainless Steel MF22 Alloy Steel A182-F22 M625 Inconel 625
M310 310 Stainless Steel M6061 Aluminum 6061-T6 M686 Inconel 686
M316 316 Stainless Steel M360 Brass 360 M718 Inconel 718
M316L 316L Stainless Steel M1018 Carbon Steel C-1018 M750 Inconel X-750
M316H 316H Stainless Steel MA105 Carbon Steel A105 MPVDF Kynar
M317 317 Stainless Steel M276 Hastelloy C-276 M400 Monel 400
M317L 317L Stainless Steel M277 Hastelloy X M405 Monel 405
M317H 317H Stainless Steel M278 Hastelloy B-3 M500 Monel K-500
M321 321 Stainless Steel M279 Hastelloy B-2 M200 Nickel 200
M347 347 Stainless Steel M160 Haynes HR 160 MTFEM Teflon, PTFE Mechanical Grade
M347H 347H Stainless Steel M800 Incoloy 800 MTFEV Teflon, PTFE Virgin Grade
M410 410 Stainless Steel M800H Incoloy 800H M152 Titanium Grade 2
M446 446 Stainless Steel M800HT Incoloy 800HT M155 Titanium Grade 5
M2205 2205 Duplex Stainless Steel M825 Incoloy 825 MZ702 Zirconium R60702
MA20 Alloy 20 Stainless Steel M600 Inconel 600 MY99 Other Material, Specify

OPTIONAL FEATURES
The following are some of the optional features available on Sandelius thermowells. To order a thermowell with any of the listed
options simply add the suffix (or suffixes by dashes) at the end of the thermowell part number. If an optional requirement must be in
compliance with a precise specification or procedure, please reference this on your order. Consult factory for special requirements not
listed below.
SUFFIX OPTIONAL FEATURE
BC Brass plug with stainless steel chain
SC Stainless steel plug and chain
TAOS Tantalum over sheath (Available on 420 series flanged type and 520 series Van Stone type
Pressure Testing Options
PT(xxxx) Internal Hydrostatic Pressure Test at stated pressure (psi). Example PT1000 = Internal Pressure Test at 1,000 psi.
PT(xxxx) X(x) If there is a specific time requirement, add an “X” then add the time required in minutes.
Example: PT2000 X 15 = Internal Pressure Test at 2000 psi for 15 minutes
EP(xxxx) External Hydrostatic Pressure Test at stated pressure (psi). Example EP1000 = External Pressure Test at 1,500 psi.
EP(xxxx) X(x) If there is a specific time requirement, add an “X” then add the time required in minutes.
Example: EP2500 X 15 = External Pressure Test at 2500 psi for 15 minutes
Weld Checking & Performance Options
DB Dye Penetrant Check – both root and final pass of flange weld
DC Dye Penetrant Check – final cover pass of flange weld
DR Dye Penetrant Check – root pass of flange weld
RX Radiographic examination (X-Ray) of flange weld
PW Post weld heat treatment
QW Qualified welder
WP Weld procedure specification
UT Ultrasonic Shear Wave Test
Material Testing Options
MT Material Test Reports
NA NACE MR-01-75. Thermowell must be made of a NACE recognized material.
YNA NACE MR-01-03. Thermowell must be made of a NACE recognized material.
PM Positive material identification
Cleaning Options
CO Clean for Oxygen service
CC Clean for Chlorine service
Special Certifications
CR Canadian Registration Number (Canadian province must be specified on order).
Special Coatings, Stellite or Alloy Welded Tips
Consult Many types of coatings can be applied to thermowells to add corrosion and/or wear resistance (See page B-12 of
Factory this catalog). Thermowells can also be fitted with special welded-on alloy tips made of Stellite or other materials.
The number of possible variations is virtually limitless. If you have a special design you need manufactured or
would like to investigate possible new, special designs that may improve service life in your application, please
call us. We will be glad to work with you.

B-2 Rev. 7
SCREWED TYPE THERMOWELLS
120 SERIES THERMOWELLS - THREADED WITH STRAIGHT SHANK

WITHOUT LAGGING EXTENSION

3/4 1 U
AVAILABLE
WRENCH
ALLOWANCE
THREAD
ALLOWANCE
PART B P-NPT
NUMBER BORE D SIZES
D–DIAMETER. 122A 0.260 1/2 1/2, 3/4 or 1
N
122B 0.260 5/8 1/2, 3/4 or 1
1/2” NPT 122D* 0.260 49/64 3/4 or 1
INTERNAL P-NPT B–BORE E-WEB 122E 0.260 7/8 3/4 or 1
STANDARD
1/4” STANDARD 122F 0.260 1 1
A
=U+1 1/2” 122G 0.260 1 1/16 1
123B 0.290 5/8 1/2, 3/4 or 1
123D 0.290 49/64 3/4 or 1
123E 0.290 7/8 3/4 or 1
123F 0.290 1 1
123G 0.290 1 1/16 1
WITH LAGGING EXTENSION
3/4 T 1 U 124D* 0.385 49/64 3/4 or 1
124E 0.385 7/8 3/4 or 1
WRENCH THREAD
ALLOWANCE
LAG LENGTH ALLOWANCE

124F 0.385 1 1
D–DIAMETER.
124G 0.385 1 1/16 1
N 125D 0.515 49/64 3/4 or 1
1/2” NPT
INTERNAL 125E 0.515 7/8 3/4 or 1
P-NPT B–BORE E-WEB
STANDARD
1/4” STANDARD 125F 0.515 1 1
A 125G 0.515 1 1/16 1
=U+T+1 1/2”
126E 0.703 7/8 3/4 or 1
126F 0.703 1 1
126G 0.703 1 1/16 1

130 SERIES THERMOWELLS - THREADED WITH TAPERED SHANK

WITHOUT LAGGING EXTENSION
3/4 1 U
WRENCH
ALLOWANCE
THREAD
ALLOWANCE
Q-DIAMETER AVAILABLE
PART B P-NPT
NUMBER BORE D SIZES
D–DIAMETER
132A 0.260 1/2 1/2, 3/4 or 1
132B* 0.260 5/8 3/4 or 1
N
1/2” NPT 132C 0.260 3/4 3/4 or 1
INTERNAL P-NPT
B–BORE
E-WEB 132D 0.260 49/64 3/4 or 1
STANDARD
1/4” STANDARD 132E 0.260 7/8 1
A
=U+1 1/2”
133B 0.290 5/8 3/4 or 1
133C 0.290 3/4 3/4 or 1
P-NPT Q 133D 0.290 49/64 3/4 or 1
WITH LAGGING EXTENSION 1/2 5/8 133E 0.290 7/8 1
U 3/4 7/8
3/4
WRENCH
ALLOWANCE
T
LAG LENGTH
1
THREAD
ALLOWANCE 1 1 1/16 134C 0.385 3/4 3/4 or 1
Q-DIAMETER
134D* 0.385 49/64 3/4 or 1
134E 0.385 7/8 1
D–DIAMETER.
135D 0.515 49/64 3/4 or 1
N 135E 0.515 7/8 1
1/2” NPT
INTERNAL P-NPT
136F 0.703 1 1
STANDARD B–BORE
E-WEB
1/4” STANDARD
A
=U+T+1 1/2”
* – Items preceded by an asterisk are the most
commonly ordered sizes. In the absence of
TO ORDER ANY 120 or 130 SERIES THERMOWELL SPECIFY: universally recognized thermowell standards,
these items may be considered to be standard
132B–3/4–18–M316– sizes.

“T” Dimension (if any)

Materials. See pg. B-2
“U” Insertion Length (inches)
“P” Process Connection
Part Number

B-3 Rev. 4
SCREWED TYPE THERMOWELLS
140 SERIES THERMOWELLS – THREADED WITH STEPPED SHANK

WITHOUT LAGGING EXTENSION AVAILABLE

PART B P-NPT
3/4
WRENCH
1
THREAD
U
2.5 NUMBER BORE Q SIZES
ALLOWANCE ALLOWANCE
Q-DIAMETER
142B 0.260 5/8 1/2, 3/4 or 1
142C* 0.260 3/4 3/4 or 1
D–DIA. 1/2” 142E* 0.260 7/8 3/4 or 1
N
1/2” NPT
INTERNAL * – Items preceded by an asterisk are the most
STANDARD P-NPT
BORE 0.26 E-WEB commonly ordered sizes. In the absence of universally
A 1/4” STANDARD recognized thermowell standards, these items maybe
=U+1 1/2”
considered to be “standard sizes”.

WITH LAGGING EXTENSION TO ORDER ANY 140 SERIES THERMOWELL SPECIFY:

3/4 T 1 U 142C–3/4–9–M316–T1-1/2
WRENCH
ALLOWANCE
LAG LENGTH THREAD 2.5
ALLOWANCE Q-DIAMETER
“T” Dimension (if any)
Materials. See pg. B-2
D–DIA. 1/2”
N “U” Insertion Length (inches)
1/2” NPT
INTERNAL “P” Process Connection
STANDARD P-NPT
BORE 0.26 E-WEB Part Number
A 1/4” STANDARD
=U+T+1 1/2”

200 SERIES LIMITED SPACE THERMOWELLS

220 SERIES THERMOWELLS – STRAIGHT SHANK

1 1/4” U

AVAILABLE
5/16” PART B P-NPT
NUMBER BORE D SIZES
222A* 0.260 1/2 3/4 or 1
222B 0.260 5/8 3/4 or 1
222D 0.260 49/64 3/4 or 1
D–DIAMETER
N 224D 0.385 49/64 3/4 or 1
1/2” NPT 224E 0.385 7/8 3/4 or 1
INTERNAL
STANDARD
B–BORE
P-NPT

E-WEB
A=U+1 1/16” 3/16” STANDARD

AVAILABLE
PART B P-NPT
NUMBER BORE D SIZES
232A* 0.260 1/2 3/4 or 1
230 SERIES THERMOWELLS – TAPERED SHANK 232B 0.260 5/8 3/4 or 1
232C 0.260 3/4 3/4 or 1
1 1/4” U P-NPT Q 234C 0.385 3/4 3/4 or 1
3/4 7/8 234D 0.385 49/64 3/4 or 1
5/16” 1 1 1/16
Q

TO ORDER ANY 220 or 230 SERIES THERMOWELL SPECIFY:

N
D–DIAMETER
222A–3/4–2-1/2–M304
1/2” NPT
INTERNAL Material See Pg. B-2
STANDARD
P-NPT
B–BORE “U” Insertion Length (inches)

“P” Process Connection

E-WEB
A=U+1 1/16” 3/16” STANDARD Part Number

B-4 Rev. 6
FLANGED TYPE THERMOWELLS
420 SERIES – STRAIGHT SHANK
PART B
T U NUMBER BORE D FLANGE
422B 0.260 5/8 Any
WELD WELD
422C* 0.260 3/4 Any
422D 0.260 49/64 Any
422E 0.260 7/8 Any
422F 0.260 1 Any
C 422G 0.260 1 1/16 Any
1 1/4” DIA. D – DIAMETER

424C 0.385 3/4 Any

424D 0.385 49/64 Any
B 424E* 0.385 7/8 Any
N
1/2” NPT
424F 0.385 1 Any
FLANGE SIZE
INTERNAL & FACING AS E-WEB 424G 0.385 1 1/16 Any
STANDARD REQUIRED 1/4” STANDARD

A=U+T-1/4”

430 SERIES – TAPERED SHANK PART

NUMBER
B
BORE Q D FLANGE
T U 432CA 0.260 3/4 1/2 Any
432EB* 0.260 7/8 5/8 Any
432EC 0.260 7/8 3/4 Any
WELD WELD 432ED 0.260 7/8 49/64 Any
Q - DIA. 432FB 0.260 1 5/8 Any
432FC 0.260 1 3/4 Any
432FD 0.260 1 49/64 Any
C 432GB 0.260 1 1/16 5/8 Any
1 1/4” DIA. D – DIAMETER
432KC 0.260 1 1/4 3/4 Any

434EC 0.385 7/8 3/4 Any

B-BORE
N 434ED 0.385 7/8 49/64 Any
1/2” NPT FLANGE SIZE 434FB 0.385 1 5/8 Any
INTERNAL E-WEB
STANDARD
& FACING AS
REQUIRED 1/4” STANDARD
434FC 0.385 1 3/4 Any
434FD* 0.385 1 49/64 Any
A=U+T-1/4” 434GC 0.385 1 1/16 3/4 Any
434KE 0.385 1 1/4 7/8 Any

440 SERIES – STEPPED SHANK

T U PART B
NUMBER BORE Q FLANGE

WELD WELD
442B 0.260 5/8 Any
442C 0.260 3/4 Any
442E* 0.260 7/8 Any
Q - DIA. 2.5

C
1 1/4” DIA. D – DIAMETER 1/2”

Items preceded by an asterisk are the most commonly

BORE ordered sizes. In the absence of universally recognized
E-WEB
0.260 1/4” STANDARD thermowell standards, these items may be considered to
N
1/2” NPT FLANGE SIZE be “standard sizes”.
INTERNAL & FACING AS
STANDARD REQUIRED

A=U+T-1/4”

TO ORDER ANY FLANGED TYPE THERMOWELL SPECIFY:

FP 422C–18–M304–T2-1/4–1-1/2” 150#RF
Flange size, pressure rating and facing
(Unless otherwise specified, flamge material will be the same as the well material.)
“T” Dimension (inches). The most commonly used “T” is 2 1/4”.
Material (see pg. B-2)
“U” Insertion Length (inches)
Part Number
Prefix Part Number with “FP” if Full Penetration weld is required

B-5 Rev. 6
VAN STONE TYPE THERMOWELLS
520 SERIES – STRAIGHT SHANK
T U PART B
F 1/4” STANDARD NUMBER BORE D
522C* 0.260 3/4
522E 0.260 7/8
523C 0.290 3/4
523E 0.290 7/8

C DIA.† D – DIAMETER 524C 0.385 3/4

524E* 0.385 7/8
525C 0.515 3/4
B-BORE
N 525E 0.515 7/8
1/2” NPT R-RAISED FACE DIA.†
INTERNAL E-WEB
STANDARD Optional Backing Flange 1/4” STANDARD † See table below for “C” & “R” dimensions
of common flange sizes.
A=U+T-1/4”

530 SERIES – TAPERED SHANK PART B

T U NUMBER BORE Q D
F 1/4” STANDARD 532CA 0.260 3/4 1/2
532EB* 0.260 7/8 5/8
532EC 0.260 7/8 3/4
532ED 0.260 7/8 49/64
Q-DIA. 532FB 0.260 1 5/8
532FC 0.260 1 3/4
532FD 0.260 1 49/64
C DIA.† D – DIAMETER
534EC 0.385 7/8 3/4
534ED* 0.385 7/8 49/64
B-BORE 534FC 0.385 1 3/4
N
1/2” NPT
534FD 0.385 1 49/64
R-RAISED FACE DIA.†
INTERNAL E-WEB
STANDARD Optional Backing Flange 1/4” STANDARD

† See table below for “C” & “R” dimensions

A=U+T-1/4”
of common flange sizes.

540 SERIES – STEPPED SHANK PART B

T U NUMBER BORE Q
F 1/4” STANDARD
542B 0.260 5/8
542C 0.260 3/4
Q-DIA.
542E* 0.260 7/8
2 1/2”

† PIPE
C DIA.† D – DIA. 1/2” SIZE C R
0.75 1.050 1 11/16
1 1.315 2
BORE
N 0.260 1.25 1.660 2 1/2
1/2” NPT R-RAISED FACE DIA.† 1.5 1.900 2 7/8
INTERNAL
STANDARD Optional Backing Flange
E-WEB
1/4” STANDARD
2 2.375 3 5/8

A=U+T-1/4”
* Items preceded by an asterisk are the most
commonly ordered sizes. In the absence of
universally recognized thermowell standards,
TO ORDER ANY 500 SERIES THERMOWELL SPECIFY: these items may be considered to be “standard”
sizes.
522C–1–16–M316–T2-1/4

“T” Dimension (inches). Standard “T” is 2 1/4”. NOTE: Van Stone type wells are designed to fit
Material See Pg. B-2 standard lap joint backing flanges. Unless
specifically requested, bcking flanges are not
“U” Insertion Length (inches)
included with your order. If backing flanges are
Pipe Size desired, specify pressure rating and material.
Part Number

B-6 Rev. 5
SOCKET WELD TYPE THERMOWELLS
620 SERIES– 630 SERIES– 640 SERIES–
STRAIGHT SHANK TAPERED SHANK STEPPED SHANK
T U T U
T U

2.5
Q–DIA. Q–DIA.

C DIA. D – DIA. C DIA. D – DIA. 1/2”

C DIA. D – DIA.

B-BORE B-BORE B-BORE

N N 0.260
N
1/2” NPT 1/2” NPT E-WEB 1/2” NPT
E-WEB
INTERNAL INTERNAL 1/4” INTERNAL E-WEB
1/4” A=U+T-1/4” A=U+T-1/4”
STANDARD A=U+T-1/4” STANDARD STANDARD STANDARD STANDARD 1/4”
STANDARD

PART B PART B PART B

NUMBER BORE D NUMBER BORE D NUMBER BORE D
622C 0.260 3/4 632B 0.260 5/8 642B 0.260 5/8
622D 0.260 49/64 632C 0.260 3/4 642C 0.260 3/4
622E-1 0.260 7/8 632D 0.260 49/64 642E-1 0.260 7/8

624C 0.385 3/4 634C 0.385 3/4

624D 0.385 49/64 634D 0.385 49/64
624E-1 0.385 7/8

625C 0.515 3/4

625D 0.515 49/64
625E-1 0.515 7/8

TO ORDER ANY SOCKET WELD TYPE THERMOWELL SPECIFY: C – PIPE C – ACTUAL Q

SIZE SIZE 630 Series
632C–3/4–10 1/2–M310–T1 3/4
3/4 1.050 13/16
“T” Dimensions in inches 1 1.315 1
Material See Pg. B-2
NOTE: It is good practice to check the ID of socket weld fittings to confirm
“U” Insertion Length (inches)
the thermowell shank will pass through it. Part numbers followed by a “-1”
“C” Pipe Size are recommended for a 1” pipe size only (due to ID size limits of 3000#
Part Number fittings).

WELD-IN TYPE THERMOWELLS

T U
1 3/8”
STANDARD PART B
NUMBER BORE D
C DIA. D – DIA.
332A 0.260 1/2
B-BORE
332B 0.260 5/8
N E-WEB 332C 0.260 3/4
1/2” NPT
A=U+T-1/4”
1/4”
STANDARD 332D 0.260 49/64
INTERNAL
STANDARD 332E 0.260 7/8

333B 0.290 5/8

333C 0.290 3/4
333D 0.290 49/64
TO ORDER ANY WELD-IN TYPE THERMOWELL SPECIFY: 333E 0.290 7/8
334E–12–M316–T4
334C 0.385 3/4
334D 0.385 49/64
334E 0.385 7/8
“T” Dimensions in inches
Material See Pg. B-2 335D 0.515 49/64
“U” Insertion Length (inches) 335E 0.515 7/8
Part Number
335F 0.515 1

B-7 Rev. 5
GROUND JOINT TYPE THERMOWELLS
720 SERIES – STRAIGHT SHANK 730 SERIES – TAPERED SHANK

T U T U

Q.–DIA.

D – DIA. D – DIA.

B-BORE B-BORE
N 3/4” NPT P N 3/4” NPT P
STANDARD E-WEB E-WEB
O STANDARD O
1/4” 1/4”
A=U+T-1/4” STANDARD A=U+T-1/4” STANDARD

PART B PART B
NUMBER BORE D NUMBER BORE D
722B 0.260 5/8 732B 0.260 5/8
722C 0.260 3/4 732C 0.260 3/4
722E 0.260 7/8 732E 0.260 7/8

724C 0.385 3/4 734C 0.385 3/4

724E 0.385 7/8 734E 0.385 7/8

725E 0.515 7/8 735E 0.515 7/8

P O P O Q
RADIUS DIAMETER RADIUS DIAMETER
1 1 3/8 1 1 3/8 1
1 1/4 1 3/4 1 1/4 1 3/4 1 1/4

740 SERIES – STEPPED SHANK

PART B
NUMBER BORE Q
T U
742B 0.260 5/8
Q
2 1/2” 742C 0.260 3/4
742E 0.260 7/8

D – DIA. 1/2”

B-BORE P O
N 3/4” NPT
STANDARD O
P
E-WEB RADIUS DIAMETER
1/4”
A=U+T-1/4” STANDARD 1 1 3/8
1 1/4 1 3/4

TO ORDER ANY GROUND JOINT THERMOWELL SPECIFY:

732C–1–10–M316–T2-7/8
“T” Dimensions in inches
(Most commonly used “T” is 2 7/8”).
Material See Pg. B-2
“U” Insertion Length (inches)
“P” Process Connection Radius
Part Number

B-8 Rev. 3
CLAMP JOINT TYPE THERMOWELLS
Sandelius manufactures a complete line of clamp joint type thermowells. They can be supplied with matching hubs, rings and clamps or installed into existing
Grayloc* hub type connectors using Grayloc rings and clamps. Clamp joint type thermowells are available in your choice of one or two piece constructions. In
the one piece construction (Style H1), the entire thermowell including the hub is machined from a single piece of solid bar. The two piece construction (Style
H2) is similar to standard flanged thermowells in that the mounting hub is welded to the thermowell stem.

The most commonly used sizes are 1”, 1 1/2” and 2”, however they are available with any standard hub size. Shank and bore sizes other then those shown
below are available on request.

TYPICAL STYLE H1 TYPICAL STYLE H2

ONE PIECE THERMOWELLS TWO PIECE WELDED THERMOWELLS
STYLE H120 SERIES – STRAIGHT SHANK STYLE H220 SERIES – STRAIGHT SHANK
T U T U

E-WEB E-WEB
1/4” 1/4”
STANDARD STANDARD

D – DIA. D – DIA.

B-BORE
B-BORE
N
N
1/2” NPT INTERNAL
1/2” NPT INTERNAL STANDARD
C C
STANDARD

STYLE H130 SERIES – TAPERED SHANK STYLE H230 SERIES – TAPERED SHANK
T U
T U
E-WEB
1/4” E-WEB
STANDARD 1/4”
STANDARD

D – DIA.
D – DIA.

Q–DIA. B-BORE
Q–DIA. B-BORE
N N
1/2” NPT INTERNAL C 1/2” NPT INTERNAL
STANDARD STANDARD C

STYLE H140 SERIES – STEPPED SHANK STYLE H240 SERIES – STEPPED SHANK

T U T U

E-WEB
E-WEB 2 1/2”
2 1/2” 1/4”
1/4” STANDARD
STANDARD

D – DIA.
D – DIA.

Q–DIA. B-BORE Q–DIA. B-BORE

N N
1/2” NPT INTERNAL 1/2” NPT INTERNAL
STANDARD C STANDARD C

TABLE A TABLE B: HUB SIZES To Order Clamp Joint Type Thermowells Specify:
Designation “D” Dia. Pipe Hub “C” Seal Ring Clamp HI–3–2–FC–1GR11–U12–M304–T1-3/4
Size Designation Dim. Ring ID Size
A 1/2”
B 5/8” 1” 1GR7 2 7 0.906 1
C 3/4” 1GR11 2 11 1.125 1
D 49/64” 1 1/2” 1 GR11 3 1/8 11 1.125 1 1/2 “T” Length (inches)
E 7/8” 1 GR14 3 1/8 14 1.610 1 1/2 Material (See page B-2.)
F 1” 2” 2GR14 3 5/8 14 1.610 2
2GR20 3 5/8 20 2.063 2 “U” Insertion Length (inches)

Hub Designation. See Table B.

TABLE C — SEAL RINGS
Standard Seal Ring Material Service Temperature Range “D” Diameter. See Table A.
(Use double letter for tapered or stepped shank
Carbon Steel – Teflon Coated -50º to 350ºF Bore Size: 2=0.260”, 4=0.385”
Carbon Steel – MOS 2 Coated -50º to 350ºF
17-4 PH Stainless Steel – Teflon Coated -452º to 450ºF 2 = Straight Shank
17-4 PH Stainless Steel – MOS 2 Coated -452º to 450ºF 3 = Tapered SDhank
4 = Stepped Shank
H1= Solid One Piece Construction
H2= Welded Two Piece Construction
*Grayloc is a registered trademark of Gray Tool Company

B-9 Rev. 4
METAL PROTECTING TUBES
Style P: Plain Pipe Type Protecting Tube
L

Closed End

Male NPT Thread

Style B: Pipe Type Protecting Tube with Mounting Bushing

U T

Closed End Male NPT Thread

Bushing Size &
Material as Required

Table 1
Style F: Pipe Type Protecting Tube with Flange
PART A.S.A PIPE
NUMBER SCHEDULE U T

905 5
910 10
940 40
980 80
916 160
955 XXH
Specify flange size,
pressure rating, Male NPT Thread
Closed End Flange
facing & material
when ordering.

Table 2 Table 3

PIPE OUTSIDE WALL THICKNESS OF A.S.A. PIPE SCHEDULES BUSHING ORDER

SIZE DIAMETER 5 10 40 80 160 XXH SIZE CODE
1/8 0.405 0.035 0.049 0.068 0.095 — — 1/2 B4
1/4 0.540 0.049 0.065 0.088 0.119 — — 3/4 B6
3/8 0.675 0.049 0.065 0.091 0.126 — — 1 B8
1/2 0.840 0.065 0.083 0.109 0.147 0.187 0.294 1 1/4 B10
3/4 1.050 0.065 0.083 0.113 0.154 0.218 0.308 1 1/2 B12
1 1.315 0.065 0.109 0.133 0.179 0.250 0.358 1 3/4 B14
1 1/4 1.660 0.065 0.109 0.140 0.191 0.250 0.382 2 B16
1 1/2 1.900 0.065 0.109 0.145 0.200 0.281 0.400
2 2.375 0.065 0.109 0.154 0.218 0.343 0.436 • Unless otherwise specified, carbon steel
bushings are furnished.

OPTIONAL MACHINE TIPS

The use of properly designed machined tips on pipe type
protecting tubes can improve the response time and
TO ORDER ANY 900 SERIES PIPE TYPE PROTECTING TUBE SPECIFY: accuracy of an installation. The following are tips
940 S B–1/2–24–M316SS–T6–B12–CP931 designed for use with 0.25” O.D. temperature probes.
Similar tips are available in any size or design desired.
Optional machined tip
Same material as pipe 2 1/2”
(Leave blank if not required.)
Pipe I.D.
Mounting bushing from Table 3 or flange size, Stepped Tip
pressure rating, facing and material. 1/2” PN: CP931
“T” Dimensions in inches (if applicable). B=0.260” Pipe O.D.
Material (See page B-2). 3” Pipe I.D.
“U” Insertion Length or “L” for Plain Tubes Tapered Tip
5/8” PN: CP932
Pipe size, from Table 2.
B=0.260” Pipe O.D.
Style letter from diagrams above.

Insert “S” for seamless pipe or “W” for welded pipe. 2 1/2”
Pipe I.D.
Specify part numeber from Table 1 Straight Tip
D PN: CP933
D=O.D. of Pipe
B=0.260”

B-10 Rev. 4
CERAMIC PROTECTING TUBES

Typical Ceramic Tube, Plain End Typical Ceramic Tube with Typical Ceramic Tube
“F” 3/4” x 1/2” Mounting Fitting with a Mounting Nipple
L L L

Ceramic and Structured Silicon-Carbide Protecting Tubes

ALUMINA MULLITE STRUCTURED
PART NO. PART NO. SILICON-CARBIDE PART NO. I.D.** O.D.** MOUNTING FITTING**
AL250-(L) ML250-(L) HR0203-(L) 1/4” 3/8” None – Plain End
AL250N-(L) ML250N-(L) HR0203N-(L) 1/4” 3/8” 1/2” NPT Close Steel Nipple*
N/A N/A HR0305-(L) 3/8” 5/8” None – Plain End
N/A N/A HR0305-(L) 3/8” 5/8” 3/4” NPT Close Steel Nipple
AL437-(L) ML437-(L) N/A 7/16” 11/16” None – Plain End
AL437N-(L) ML437N-(L) N/A 7/16” 11/16” 3/4” NPT Close Steel Nipple*
AL437F-(L) ML437F-(L) N/A 7/16” 11/16” 3/4” x 1/2” NPT Steel Hex Fitting*
AL500-(L) ML500-(L) HR0406-(L) 1/2” 3/4” None – Plain End
AL500N-(L) ML500N-(L) HR0406N-(L) 1/2” 3/4” 1” NPT Close Steel Nipple*
N/A N/A HR0408-(L) 1/2” 1” None – Plain End
N/A N/A HR0408N-(L) 1/2” 1” 1 1/4” NPT Close Steel Nipple*
AL750-(L) ML750-(L) N/A 3/4” 1” None – Plain End
AL750N-(L) ML750N-(L) N/A 3/4” 1” 1 1/4” NPT Close Steel Nipple*
N/A N/A HR0610-(L) 3/4” 1 1/4” None – Plain End
N/A N/A HR0610N-(L) 3/4” 1 1/4” 1 1/2” NPT Close Steel Nipple*
AL-1000-(L) ML-1000-(L) N/A 1” 1 1/4” None – Plain End
AL-1000N-(L) ML-1000N-(L) N/A 1” 1 1/4” 1 1/4” NPT Close Steel Nipple*

* All standard mounting fittings are carbon steel. Stainless steel fittings may be specified by adding an “S” to the part number. Example: AL437NS-24.
** Tubes and fittings shown in the table are typical. Additional sizes and special mounting fittings are available on request.

To Order specify part number – “L” length in inches; Example: AL437N-36

SILICON-CARBIDE PROTECTING TUBES

Typical Silicon-Carbide Tube; Plain End Typical Silicon-Carbide Tube with Collar

L L

Standard Silicon-Carbide Protecting Tubes

PART I.D. O.D. MOUNTING FITTINGS* NORMALLY AVAILABLE
NUMBER LENGTHS
SCO814 1” 1 3/4” None* Up to 48”
SCO814C 1” 1 3/4” 3” Dia. x 1” Thick Collar Up to 48”

*Note: Various types of mounting fittings can be cemented to Silicon-Carbide tubes on request.
To Order Silicon-Carbide tubes specify part number and length in inches.
Ex: SCO814C-24.

B-11 Rev. 4
 CORROSION, EROSION & COATINGS
It is often necessary to put thermowells into extremely corrosive and/or erosive environments. In such cases, the proper selection of materials becomes
critical to the success of the installation.

CHEMICAL CORROSION RESISTANCE

While various coatings can help ward off the effects of chemically corrosive environments, thermowells made entirely of corrosive resistant materials are
the best choice in corrosive applications. Page 2 of this catalog lists over 50 different currently available materials from which Sandelius thermowells can
be manufactured. Included are many grades of stainless steel, alloy steel, Incoloy, Inconel, Monel, Nickel, Kynar, Teflon, titainum and zirconium. Each is
effective in various operating environments.

If a solid material that will resist the operating environment can not be found, a protective coating or sleeve are the only remaining choices to protect against
corrosives. Corrosive resistant coatings are usually applied to flanged or Van Stone-type thermowells (pgs. B-5 & B-6) with the coating covering the entire
“U” length and flange face. The more popular corrosive resistant coatings are FEP and PTFE Teflon. Many other coatings are also available on request.
Tantalum is normally used as an oversheath.

WEAR RESISTANCE
To date the best method available for slowing the effects of erosion (wearing away caused by particulate bombardments, common in such operations as
decoking) is a carefully selected hard facing material applied over a suitable base material. There are a great many hard facing materials and methods of
applying them available today. Because wear-resistant thermowell technology has been an area of specialization with Sandelius for many years, we make
every effort to keep up-to-date on new coatings and application methods as they are developed. We would be happy to work with you to determine which
of many available products would be best to try in your particular application. The following is a brief list of some of the more popular wear-resistant coatings
in use today.

Aluminum Oxide Colmonoy No. 6 Stellite No. 6 Wallex No. 6

Boron Nitride Colmonoy No. 75 Stellite No. 12 Wallex No. 50
Ceramics Stellite No. 1 Wallex No. 1 Wallex No. 55

HOW TO SPECIFY COATINGS

After determining which coating is the best choice for your application, it is important to specify it correctly. We cannot stress this point strongly enough.
For example, it is obvious that a 0.020 inch thick coating of sprayed Stellite No. 6 is not equivalent to a 0.060 inch thick coating of T.I.G. welded Stellite No.
1. Yet both can truthfully be referred to as “Stellite” coatings.
Your order should include all the information necessary to insure you will receive the exact coating you require. The following 6 points should be included
in all specifications for coated thermowells. If you would like assistance in making the best selections, please call us at anytime.

1. The exact material of the coating desired.

Many otherwise excellent specifications fail on this simple point. A common example of this problem is the use of the name “Stellite” without additional
information. There are at least 14 different “Stellite” alloys available, each of which has its own advantages. Simply specifying “Stellite” without additional
information allows the supplier to choose which Stellite alloy to use; there is a good chance of not getting the best one for your applicatopn. By simply
specifying the full name i.e., “Stellite No. 1”, this problem is completely avoided.
2. Method of Application
Some of the more commonly used methods of applying coatings are: Spray Gun or Flame Spray, Gas Tungsten Arc, Submerged-Arc, Open-Arc, OxyAcety-
lene Disposition, Shielded Metal-Arc Disposition, Plasma Arc and Diffusion Coating. The method of application is an important variable.

3. The Portion of the Thermowell to be Coated

Wear-resistant coatings add significant cost to a thermowell. To avoid financial waste, they need only be applied to the portion of the thermowell that is
subjected to wear. This is especially important in long thermowells; only the tips of which are actually being subjected to wear.

4. The Thickness of the Coating

Depending on the type, coatings can be anywhere from a few thousandths of an inch to a 1/4” or more in thickness. Often the same coating can be applied
in any number of different thicknesses. Both the effectiveness and the cost of the coating are determined in part by its thickness (thicker coatings are not
always better). To avoid confusion, specify the thickness desired as a thickness “per side”. It is easy to think of a thermowell, which starts as 1” O.D. and
is coated to a finish O.D. of 1 1/8” as having a 1/8” thick coating. However, in fact the coating is only 1/16” thick “per side” thus adding a total of 1/8” to the
O.D. of the thermowell.

5. The Finish Requirements of the Coating

Metallic coatings such as Stellite and Colmonoy can be left “as applied”, machined smooth or even polished. In most cases a smooth or polished finish will
provide superior wear-resistance in service than “as applied” coating. Desired finishes should be specified using standard RMS designations:
RMS 32 is equivalent to a very smooth machine finish.
RMS 16 is a lightly polished finish
RMS 8 is a highly polished “mirror” finish

We recommend a minimum or RMS 32 finish be specified on all machineable coatings.

6. The Finished O.D. of the Coated Thermowell
As coatings are applied over a base material, it is easy to become confused if the actual finished size is not specified as a finished size. For example, an
order calling for a 3/4” O.D. thermowell with a 1/16” per side coating can be interpreted in either of 2 ways. First, if could be interpreted to mean the final
O.D. of the finished thermowell is 3/4” or second, it could be interpreted to mean the thermowell is to be 3/4” O.D. before the coating is applied resulting in
a finished O.D. of 7/8”. It is important your specificaiton be clear on all points.

B-12 Rev. 4