June 2001 Bulletin 32.
2:2100
Type 2100 Pneumatic and Type 2100E
Electric Liquid Level Switches
The on-off Type 2100 pneumatic switch (figure 1) and constructions comply with the recommendations of the
Type 2100E electric switch (figure 2) sense high or low National Association of Corrosion Engineers (NACE)
liquid levels. Typically, these switches pneumatically or standard MR0175.
electrically operate safety shutdown systems for field
processing equipment in oil and gas production
D Application Versatility—The Type 2100 and
applications. The Type 2100 and 2100E switches both
2100E switch construction comes in a left-hand as well
use a displacer-style sensor located in an external
as a right-hand mounting version. The explosion-proof,
cage that mounts on the outside of a vessel.
hermetically sealed Type 2100E switch is offered as
both a factory mounting and as an electric switch
Features retrofit to the proven Type 2100 switch.
D Proven Rugged Construction—The switch is
D Installation Versatility—The displacer cage has
isolated and sealed from the process through a
two 1-inch NPT pipe plugs that you can remove and
corrosion-resistant displacer and torque tube assembly
relocate for horizontal instead of vertical equalizing
for maximum reliability. The displacer can withstand up
piping, or for installation of a bleed or drain valve.
to 1-1/2 times the maximum working pressure,
allowing it to remain in the cage during hydrostatic
testing. D Easy Reversibility—Switching action for both
the Type 2100 and 2100E switches is field-reversible
D Sour Gas Service Capability—Materials are from high-level to low-level or vice versa without
available for applications handling sour gases. These additional parts.
W6102-1/IL W6104-1/IL
WITH RIGHT HAND MOUNTING WITH LEFT HAND MOUNTING
AND HIGH LEVEL SWITCHING AND LOW LEVEL SWITCHING
Figure 1. Type 2100 Pneumatic Liquid Level Switch
D200032X012
Bulletin 32.2:2100
Specifications
Input Signal(1) Hazardous Area Classification
Liquid level The Type 2100 and 2100E switches have no
Minimum Process Liquid Specific Gravity hazardous area approvals. However, the electrical
0.5 (consult your Fisher Controls sales office or switch in the Type 2100E supplied by ITT
sales representative for specific gravities below this NEO-DYN has been approved by CSA, FM, and UL
value) as explosion-proof for: Class I, Division 1, Groups
A, B, C, D, and Class II, Division 1, Groups E, F, G.
Output Signal(1)
Type 2100 Switch: Equal to the supply pressure Construction Materials
when the switch is in the normal position (flapper Cage: J SA-105 forged steel (standard) J SA-105
against nozzle) and reduced to approximately solution annealed carbon steel (NACE)
atmospheric pressure, depending upon the bleed Displacer: J 304L stainless steel (standard)
orifice size and the piping configuration, when the J 316L solution annealed stainless steel (NACE)
switch is activated Torque Rod & Tube Assembly: K-Monel
Type 2100E Switch: Same as supply signal Bearing: Glass-filled PTFE
Supply Signal O-Rings: Fluoroelastomer
Type 2100 Switch: J 2.1 to 4.1 bar (30 to 60 psig), Cover Gasket:
J 4.1 to 6.9 bar (60 to 100 psig) or J 6.9 to 10.3 Type 2100 Switch: Neoprene
bar (100 to 150 psig) Type 2100E Switch: Cellulose/Nitrile
Type 2100E Switch: 11 amperes, 1/4 horsepower Other Gaskets: Silicone rubber
at 125/250 volts ac; 5 amperes resistive, 3 amperes Nozzle Block Assembly (Type 2100 Switch
inductive at 28 volts dc Only): Aluminum & stainless steel
Nozzle (Type 2100 Switch Only): Stainless steel
Steady-State Air Consumption(1,2) (Type 2100 Flapper & Clamp Assembly (Type 2100 Switch
Switch) Only): Stainless steel
Less than 0.03 normal m3/hour (1.0 scfh) for all Flapper Seat (Type 2100 Switch Only):
supply pressures when the liquid level is 25.4 mm Fluoroelastomer
(1 inch) below the normal switch position (flapper Magnet (Type 2100 Switch Only): Special material
against nozzle) for high-level switching or 25.4 mm Body Block: Steel
(1 inch) above the normal switch position for Cover:
low-level switching Type 2100 Switch: Clear plastic
Maximum Working Pressure Type 2100E Switch: Acrylic
Housing (Type 2100E Switch Only): Stainless
J 153 bar (2220 psig) WOG(3) except J 24 bar
steel
(350 psig) WOG is the maximum working pressure
Other Metal Parts: Stainless steel
for sight window construction
Operative Temperature Range(1) Options
Type 2100: –29 to 204_C (–20 to 400_F) Type 2100 Switch Option: Individual street tee and
Type 2100E: –29 to 76_C (–20 to 180_F) bleed orifice (when it is not desired to supply
Displacer Diameter several level switches from one common block and
102 mm (4 inches) bleed restriction)
Sight Window Option: A sight window is available
Process Connection Size for either the Type 2100 or Type 2100E that installs
153 bar (2220 psig) WOG: J 1-inch female NPT, in place of the pipe plug, as illustrated in figure 2.
J 2-inch Schedule 80 buttwelding ends, or J 2-inch NACE Option: Constructions are available which
Schedule 160 buttwelding ends comply with recommendations of the National
Type 2100 Switch Supply Pressure Connection Association of Corrosion Engineers (NACE)
Size standard MR0175.
1/4-inch NPT female Shipping Weights
Type 2100E Switch Electrical Connection Size 153 bar (2220 psig) WOG Construction: 17.2 kg
1/2-inch NPT male (38 pounds)
1. These terms are defined in ISA Standard S51.1.
2. Normal m3/h—normal cubic meters per hour at 0_C, 1.01325 bar, absolute (Scfh—standard cubic feet per hour at 60_F, 14.7 psia)
3. Water, Oil, Gas maximum working pressure. Corresponds to Cold Working Pressure: the maximum pressure rating allowed under normal ambient temperature conditions, which are usually
understood to be –29 to 38_C (–20 to 100_F). Refer to MSS SP-25-1978.
2
Bulletin 32.2:2100
APPROXIMATE
SWITCHING POINT
LOCATION OF
OPTIONAL
SIGHT WINDOW
W6103-1*/IL
Figure 2. Type 2100E Electric Liquid Level Switch
TORQUE SUPPLY
DISPLACER TUBE
OPTIONAL
BLEED SHUTDOWN
NOZZLE ORIFICE VALVE (OR ALARM
OPTIONAL SYSTEM)
FLAPPER STREET TEE
OUTPUT SIGNAL
MAGNET
A3619-2/IL
Figure 3. Principle of Operation for High-Level Type 2100 Switch
Principle of Operation magnet, the flapper snaps away from the nozzle,
allowing output pressure to bleed through the nozzle
Figure 3 shows the Type 2100 switch with the nozzle, faster than supply pressure can enter through the
flapper, and magnet positioned for high level bleed orifice. The reduced pressure in the output
activation. When the switch is in the normal position signal line activates the shutdown or alarm system.
with the flapper against the nozzle, output pressure When the liquid level lowers, the falling displacer
cannot bleed off and remains the same as full supply forces the flapper into the field of the magnet, letting
pressure. Rising liquid level exerts a buoyant force on the magnet snap the flapper against the nozzle and
the displacer, producing a torque on the torque tube. causing output pressure to build to full supply
When the torque transmitted by the torque tube pressure.
exceeds the torque exerted on the flapper by the
3
Bulletin 32.2:2100
TORQUE TUBE ASSEMBLY
CAGE
FLAPPER & CLAMP ASSEMBLY
FLAPPER SEAT
GASKET
DISPLACER NOZZLE
NOZZLE BLOCK ASSEMBLY
O-RINGS
51A8651-E
A1053-2/IL
Figure 4. Construction Details of Low-Level Type 2100 Switch
CAGE TORQUE TUBE
ASSEMBLY
SWTICH ARM
DISPLACER
ELECTRIC
SWITCH ASSEMBLY
40B6594-D
A3600-2
Figure 5. Construction Details of Type 2100E Switch
Figure 4 shows a sectional view of the Type 2100 With the Type 2100E switch (figure 5), rising liquid
switch positioned for low level activation. The nozzle, level exerts a buoyant force on the torque tube that
flapper, and magnet are on the opposite side of the either activates or deactivates an electrical SPDT or
torque tube, so that downward displacer travel moves DPDT switch depending on the switching action
the flapper away from the nozzle. desired. Falling liquid level deactivates or activates the
same switch depending on the action desired.
4
Bulletin 32.2:2100
DIMENSIONS
TYPE mm Inches
A B C A B C
2100 117 99 99 4.62 3.88 3.88
2100E 130 57 108 5.12 2.25 4.25
211 1-INCH NPT
C
(8.31) 43 TAPPED & PLUGGED
(1.66)
38
(1.50)
140
(5.50)
A 102
(4.00)
27
287 (1.06) 211
(11.31 (8.31)
B
1/4-INCH NPT
AIR CONNECTION
0N BACK (TYPE
2100 SWITCH ONLY)
1-INCH NPT
TAPPED &
152 PLUGGED
(6.00)
12A2325-D
mm
B2007-3/IL (INCH)
Figure 6. DImensions
Installation 2100E switch is positioned so that the horizontal line
corresponds to the level at which switching is desired.
The forged-in horizontal line on a Type 2100 or Type Isolating valves should be installed in the equalizing
2100E displacer cage indicates the approximate piping between the tank and the cage. Dimensions are
switching point. When mounted, the Type 2100 or shown in figure 6.
5
Bulletin 32.2:2100
Ordering Information D Switching action for high or low level alarming
Application Construction
When ordering, specify: Refer to the specifications. Review the information
under each specification and in the referenced figures;
specify the desired selection whenever there is a
D Supply pressure (Type 2100 switch only)
choice to be made. High level switching and right-hand
mounting will be supplied automatically unless
D SPDT or DPDT switch construction (Type 2100E otherwise specified. Always specify the complete type
switch only) number of the desired equipment.
D Maximum working pressure and temperature
Fisher and Fisher-Rosemount are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.
All other marks are the property of their respective owners.
EFisher Controls International, Inc. 1974, 2001; All Rights Reserved
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express
or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
For information, contact Fisher:
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
6
Printed in U.S.A.
