Indicating Temperature Switch

Indicating temperature switch combines indication with switching (in order to make or break the associated electrical circuit).
Can be offered with contact assembly as well as microswitch (as a combination of switch and movement)

Features
n Combination of indication and switch
n Fast response
n Choice of contact assembly or microswitch
n Switching accuracy ± 2% FSD
n High repeatability and low hysteresis
n Flameproof version available
n Case compensated system

Specifications
System Gas (N2) filled case compensated in accordance with SAMA Cl. IIIB
Dial 100 mm / 150 mm in aluminium, white background, black marking
Case SS304 / SS316 with bayonet bezel (Flameproof case in Al only)
Protection Weatherproof to IP-68 (IS/IEC : 60947 / IEC : 60529)
Flameproof to IIA IIB (Equivalent to NEC Cl. I Div 2 Gr. C&D)
Flameproof to IIC (Equivalent to NEC Cl. Div 1 Gr. A&B)
Stem SS304 or SS316, 6 mm, 8 mm, 10 mm, 12 mm dia as standard
Connection ½" NPT (M) adjustable three piece compression fitting as standard
Capillary SS316 with SS304 / SS316 armouring or
SS316 with SS304 / SS316 armouring, with PVC covering
Range (-) 200 to 800°C (minimum span 80°C )
Accuracy ± 1% FSD for indication, ± 2% FSD for switching
Over range 125% FSD
Contacts 1) 1SPST /2SPST (Single/ Double) Electrical Contacts,
independently adjustable over the entire Range, rated 30VA@230V AC
2) 1SPDT /2SPDT (Single/ Double) Microswitch, independently adjustable
over entire range, rated 5A@230V AC (3A@28V DC)
3) Inductive Contacts (NAMUR), Single or Double, independently adjustable
between 10% & 90% of the Range,
Nominal Voltage, 8.32 V DC, Operating Voltage, 5 to 25 V DC
Accessory Relay for the contact assembly to suit 5 amp @ 230 V AC, separately
mounted.
Note 1) Flameproof version is offered with SPDT Microswitch in Die Cast
Aluminium housing only.
2) Surface mounted flameproof housing is available with capillary.
3) For minimum insertion length essential for proper
sensing, contact our design department.
4) Three point calibration certificate accompanies each thermometer.
5) For operating temp>600°C; stem of SS310 / Inconel 600 shall be
recommended.

Advantages of Microswitch Type Models: Microswitch is rated 5 amp @ 230 V AC (3A @ 28 VDC). No relay is required.
Microswitch is imported from reputed international supplier as combination of movement and switch.
Microswitch assembly gives better switching accuracy. Compact design.
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Ordering Information
GDT-SW-R - Rigid Stem
GDT-SW-C - Capillary Type

MODEL : GDT-SW-R / GDT-SW-C

MOUNTING OPTION
V Bottom Entry, Local Mounting TW Thermowell
C Back Entry, Local Mounting CLB Colour Band
E Every Angle, Local Mounting DUS Dual Scale
S Bottom Entry, Surface Mounting 1ST 1SPST
P Back Entry, Panel Mounting 2ST 2SPST
Y Bottom Entry, 2" Pipe Mounting 1DT 1SPDT
2DT 2SPDT
DIAL 1NR NAMUR Switch, Single
100 100 mm 150 150 mm 2NR NAMUR Switch, Double
REL Relay
FAB Flame Proof Case (IIA, IIB)
CASE
S4S SS304 S6S SS316 F2C Flame Proof Case (IIC)

ALM Die Cast Al***

UNIT
DGC Deg C DGF Deg F
STEM-OD
S06 6 mm S10 10 mm
RANGE #
S08 8 mm S12 12 mm
0 to 80 0 to 300
0 to 100 0 to 350
STEM LENGTH 0 to 120 0 to 400
Specify in mm 0 to 160 0 to 500
0 to 200 0 to 600
0 to 250 0 to 800
STEM MATERIAL
S6S SS316 S4S SS304 CONNECTION
310 SS310** 600 Inconel 600**
Conn Code Size Code Type Code Male/ Female Code
Thread T 1/4” 06 NPS NS Male M
CAPILLARY
3/8” 10 NPT NT Female F
4AR(*) SS 316 Capillary, SS 304 Armoured
4PV(*) SS 316 Capillary, SS 304 Armoured+PVC Covered 1/2” 15 BSP BP
6AR(*) SS 316 Capillary, SS 316 Armoured 3/4” 20 BSPT BT
6PV(*) SS 316 Capillary, SS 316 Armoured+PVC Covered 1” 25 JIS-PF PF
NIL Not Applicable for GDT-SW-R type. M20 M20 JIS-PT PT
Gas GS
* Specify the length of Capillary in Meters. R RR
Rp RP
**Stem material of SS310 is recommended for Temperature 600 Deg. C
Pitch 1.5 C
and Inconel 600 for temperature above 600 Deg.C
e.g. For 1/2"NPT(M), Code: T15NTM
*** for Flame proof case with microswitch only
For M20x1.5 (F), Code: TM20CF

# Ranges mentioned are in oC. Equivalent unit in oF can be provided on request.

Sample Model Code: GDT-SW-C-S-150-S4S-S10-400-600-4AR(3)-T15NTM-(0-800)-DGC-2DT

The recommendations made in this catalogue are to be used as intended guide. No guarantee of material can be undertaken since other
10/17 REV.: 00

factors may affect the performance. We reserve the right to change the specifications mentioned in this catalogue without any notice as
improvements & development is a continuous process at “General”. Responsibility of typographical errors is specifically disclaimed.

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 Blind Temperature Switch

has been designing and manufacturing reliable, high quality

Temperature Switches for accurate control of the process equipments to suit to
most of the industrial applications in various process industries. With inert Gas
Nitrogen, our Switches are most environment friendly and Safe, which makes
them the ideal choice of almost all types of process industries / applications.

Features
n Use of Inert Gas (Nitrogen)
n Non-polluting, Environment friendly
n Rugged construction
n Rigid Stem or Capillary type
n Weather proof or Flame proof enclosure
n Fast Response
n 1SPDT / 2SPDT micro-switches

Specifications
System : Inert Gas (Nitrogen) filled System
Case : Weather proof, Die-Cast Aluminium enclosure, epoxy powder coated,
conforming to IP-68 protection, in accordance with IS/IEC-60529:2001
Flameproof Die Cast Aluminum Enclosure, epoxy powder coated,
conforming to Gr. IIA, IIB & IIC T6 in accordance with IS 2148-2004
(IEC-60079:2001) & Weatherproof to IP 66 in accordance with
IS-12063:1987 (IEC-60529), approved by CMRI/CCOE/PESO
Cable entry : As shown in Table-III
Stem : SS304 or SS316, 6 mm, 8 mm, 10 mm, 12 mm
Connection : ½" NPT(M) adjustable compression fitting in SS316 as standard
(other connections on request)
Capillary : SS316 with SS304 / SS316 armouring or
SS316 with SS304 / SS316 armouring, with PVC covering
Range : As shown in Table-I
Switching Accuracy : ±1% FSD
Repeatability : ±1% FSD
Scale Accuracy : ±5% FSD
Over Range : 125% FSD
Switch Type : 1SPDT / 2SPDT Snap Action Microswitch
Switch Rating : As shown in Table-II
Set Point : To be specified by Customer (Adjustable from 10 to 90% of the Maximum
Range), Internal Setting with tamperproof locking arrangement
Switching Differential : Fixed or Adjustable
High Voltage Strength: Withstands 0.5 KV between open contact for 1 Sec & 2 KV between
terminals and earth for one minute.
Insulation Resistance : Insulation Resistance >10 M Ohms at 500VDC
Thermowell : Refer our Catalogue for Thermowell
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Blind Temperature Switch

Note:
1) Weatherproof enclosure is effective only if all entries and joint faces are properly sealed.
2) Flameproof enclosure is weatherproof only if cover 'O' ring is retained in position; and flameproof only if suitable Flameproof Cable Gland
is provided. It is highly recommended to procure Cable Glands along with flameproof instruments to avoid negligence of the same during
installation.
3) Switch Accuracy & Repeatability are one and the same for all Blind Temperature Switches (being a switching device; not an indicating/
measuring device).
4) The instrument is calibrated in vertical mounting position. Hence mounting in any other position may cause a minor range shift.
5) Ambient temperature range: All models are suitable for operating within a range of ambient temperature from (–) 20°C to (+) 60°C
provided the process fluid does not freeze within this range. Below 0°C, precautions should be taken in humid atmospheres to prevent
frost formation inside the instrument from jamming the mechanism.
6) It is recommended to select the range of the instrument such that the set value falls between 35% to 65% of the FSR.
7) Scale Markings are for guidance only. Set the correct set value against precision Master instrument
8) Thermowells of different process connections & Material of Construction can be provided as per process requirement.

Table I : Ranges (in Deg. C)

20 to 60 (-)30 to (+)30
20 to 80 (-)30 to (+)50
20 to 100 (-)30 to (+)90
20 to 120
20 to 160 (-)40 to (+)40
20 to 200 (-)40 to (+)60
20 to 250 (-)40 to (+)80
20 to 300
(-)50 to (+)30
(-)20 to (+)40 (-)50 to (+)50
(-)20 to (+)60 (-)50 to (+)100
(-)20 to (+)80
Any other (Please specify)
Note: Ranges mentioned are in Deg.C.
Equivalent unit in Deg.F can be provided on request.

Table II : Type of Micro Switch

Description Code Availability A/C Rating DC Rating
In Type Current Voltage Current
Volt Resistive Inductive
1-SPDT 100 Fixed switching 5A-250VAC 220 0.25 A 0.03 A
Differential only 110 0.50 A 0.07 A
2-SPDT 200 24 5.0 A 3.00 A
1-SPDT 102 Fixed or Adjustable 5A-250VAC 220 0.25A 0.1A
Switching Differential 110 0.5A 0.2A
2-SPDT 202 24 8A 7A
1-SPDT 103 Fixed or Adjustable 15A-250VAC 220 0.25A 0.1A
Switching Differential 110 0.5A 0.2A
2-SPDT 203 24 8A 7A
Any Special
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Requirement XXX — — — — ---

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 Blind Temperature Switch

Table III : Type of Cable Entry

Cable Entry Single Cable Entry Double Cable Entries Double Cable Entries, one plugged
W/P FLP W/P FLP W/P FLP
(IIA/IIB/IIC) (IIA/IIB/IIC) (IIA/IIB/IIC)

¾” ET(F) W10 F10 W20 F20 WP0 FP0

3/8" BSP(F) W11 F11 W21 F21 WP1 FP1
½” BSP(F) W12 F12 W22 F22 WP2 FP2
½” NPT(F) W13 F13 W23 F23 WP3 FP3
¾” BSP(F) W14 F14 W24 F24 WP4 FP4
¾” NTP(F) W15 F15 W25 F25 WP5 FP5
¾”ET, DCCG - Brass W1A F1A W2A F2A WPA FPA
¾”ET, DCCG - SS W1B F1B W2B F2B WPB FPB
½”BSP, DCCG - Brass W1C F1C W2C F2C WPC FPC
½”BSP, DCCG - SS W1D F1D W2D F2D WPD FPD
½”NPT, DCCG - Brass W1E F1E W2E F2E WPE FPE
½”NPT, DCCG - SS W1F F1F W2F F2F WPF FPF
¾”NPT, DCCG - Brass W1G F1G W2G F2G WPG FPG
¾”NPT, DCCG - SS W1H F1H W2H F2H WPH FPH
¾”BSP, DCCG - Brass W1J F1J W2J F2J WPJ FPJ
¾”BSP, DCCG - SS W1K F1K W2K F2K WPK FPK
¾” ET, SCCG - PVC PVC --- --- --- --- ---
4 Pin Connector 4PC --- --- --- --- ---
7 Pin Connector 7PC --- --- — --- ---
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Ordering Information

BTS-R : Rigid Stem type

BTS-C : Capillary type
MODEL : BTS-R / BTS-C

MOUNTING OPTION
V Bottom Entry, Local Mounting TW Thermowell
S Bottom Entry, Surface Mounting L Nil
Y Bottom Entry, 2" Pipe Mounting
SWITCHING DIFFRENTIAL
CASE FD Fixed Differntial
WA Weatherproof Alluminium AD Adjustable Differntial
FAB Flameproof IIA / IIB Alluminium
F2C Flameproof IIC Alluminium Micro Switch
Select the Range from Table-II
CABLE ENTRY
Select Code From Table III
UNIT
DGC Deg C DGF Deg F

SENSOR (BELLOW)
RANGE
BRZ Ph Bronze Bellow
Select the Range from Table-I
S6L SS316L Bellow

CONNECTION
STEM D1A
S06 6 mm S10 10 mm Conn Code Size Code Type Code Male/ Female Code
S08 8 mm S12 12mm Thread T 1/4” 06 NPS NS Male M
3/8” 10 NPT NT Female F
1/2” 15 BSP BP
STEM LENGTH 3/4” 20 BSPT BT
Specify in mm
1” 25 JIS-PF PF
M20 M20 JIS-PT PT
STEM MATERIAL
Gas GS
310 SS310 S4S SS304
R RR
S6S SS316 600 Inconel 600
Rp RP
Pitch 1.5 C

e.g. For 1/2"NPT(M), Code: T15NTM

For M20x1.5 (F), Code: TM20CF

CAPILLARY
4AR(*) SS 316 Capillary, SS 304 Armoured
4PV(*) SS 316 Capillary, SS 304 Armoured+PVC Covered
6AR(*) SS 316 Capillary, SS 316 Armoured
6PV(*) SS 316 Capillary, SS 316 Armoured+PVC Covered
NIL Not Applicable for BTS-R type.

* Specify the length of Capillary in Meters.

Sample Model Code: BTS-R-V-WA-W13-S6L-S10-300-S6S-NIL-T15NTM-(20-200)-DGC-100-FD-L

The recommendations made in this catalogue are to be used as intended guide. No guarantee of material can be undertaken since other
10/17 REV.: 00

factors may affect the performance. We reserve the right to change the specifications mentioned in this catalogue without any notice as
improvements & development is a continuous process at “General”. Responsibility of typographical errors is specifically disclaimed.

www.generalinstruments.co.in 219 www.general-gauges.com