Instruction Manual
D200119X012
2100 and 2100E Liquid Level Switches
June 2017
2
Description
The on‐off 2100 pneumatic switch (figure 1) and the 2100E electric switch (figure 2) operate shutdown valves or alarm
systems when liquid in a vessel reaches a predetermined level. The 2100 switch uses an externally mounted displacer
that operates a nozzle‐flapper to vent the supply pressure when the switch is activated. The nozzle‐flapper has a soft
seat for tight shutoff when the switch is in its normal position (flapper against the nozzle). The 2100E switch uses the
displacer torque to activate and deactivate an electric switch for positive on‐off service. The displacer on each type can
withstand up to 1‐1/2 times the maximum working pressure, allowing it to remain in the cage during hydrostatic
testing.
Unless otherwise noted, all NACE references are to NACE MR0175-2002.
Figure 2. Fisher 2100E Electric Liquid Level Switch
APPROXIMATE
SWITCHING POINT
X0682
Specifications
Specifications for the 2100 and 2100E switches are shown in table 1.
WARNING
This product is intended for a specific current range, temperature range and other application specifications. Applying
different current, temperature and other service conditions could result in malfunction of the product, property damage or
personal injury.
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