Fisher 2100 - Calibration Check

Instruction Manual
D200119X012
2100 and 2100E Liquid Level Switches
June 2017
8
Table 2. Fisher 2100E Wiring Codes
Wire Color SPDT DPDT Switch 1 DPDT Switch 2
Red
Brown
Blue
Green
Black
Yellow
Purple
Normally Closed
Common
Normally Open
Ground
Normally Closed
Common
Normally Open
Ground
Ground
Normally Closed
Common
Normally Open
To change switch action from low‐level to high‐level switching, or vice versa, perform steps 1 through 4 and 13
through 17 of the 2100E maintenance procedure.
To reverse action of the 2100E switch, refer to table 2 and reinstall wiring for normally open (NO) switches to normally
closed (NC) and vice versa.
To change switch mounting from right‐hand to left‐hand or vice versa, perform steps found in the 2100 switch
maintenance procedure.
Calibration Check
For either type of switch, calibration can be checked by varying the level of the process liquid in the cage and observing
the switch operation.
If the process connection directly on top of the cage is not piped to the tank, close the isolating valves and fill the cage
with process liquid through the top connection. Verify that the switch operates as the cage is being filled. Repeat the
calibration procedure if necessary.
Calibration can also be checked on the work bench. Connect a flexible hose from one of the bottom process
connections to the bottom of a bucket. The top process connection should be open. Fill the bucket with process liquid.
As the bucket is raised or lowered, the liquid level in the displacer cage rises or falls. Verify that the switch operates as
the level is varied. Repeat the calibration procedure if necessary.
Dry calibration can be performed on the 2100E using the following procedure:
Refer to figure 6.
1. Position the cage and displacer assembly (key 1) so that the displacer is hanging downward.
2. Level the switch arm (key 40), if required.
3. Loosen the locknut (key 33) and adjust the machine screw (key 31) until it contacts the switch.
4. For low‐level dry calibration, tighten the locknut. For high‐level dry calibration, turn the machine screw one
additional full turn, then tighten the locknut.