Instruction Manual
D200119X012
2100 and 2100E Liquid Level Switches
June 2017
13
13. Install the pipe plug (key 2), or the bushing and sight window assembly (keys 4 and 5), into the body block (key 3).
Torque the pipe plug, or the bushing and sight window assembly, to between 68 and 136 NSm (50 and 100 lbfSft).
14. Install the pressure plug (key 9) with the attached O‐ring (key 24) into the nozzle block assembly (key 8) on the
opposite side from the magnet (key 14) and magnet bracket (key 13).
15. Install a nozzle (key 6) of the correct supply pressure range with attached O‐ring (key 26) and locknut (key 33) into
the nozzle block assembly (key 8) on the same side as the magnet (key 14) and magnet bracket (key 13).
16. Install the flapper and clamp assembly (key 12) on the shaft of the torque tube assembly (key 7) with the flapper
seat (key 11) centered over the nozzle (key 6), with the flapper at a 90‐degree angle to the center line of the nozzle,
and with the end of the flapper flat and fully on the magnet (key 14).
D For low‐level switching, tighten the nut of the flapper and clamp assembly (key 12) just enough to allow the
flapper to rotate on the shaft of the torque tube assembly when light force is applied to the flapper.
D For high‐level switching, tighten the nut of the flapper and clamp assembly (key 12) and the machine screws (key
31) to secure the magnet bracket and magnet (keys 13 and 14).
17. Adjust the nozzle (key 6) and flapper (key 12) as follows:
D For low‐level switching, rotate the nozzle (key 6) counterclockwise (up) until it is in contact with the flapper seat
(key 11). Rotate the nozzle an additional 1.5 turns in the counterclockwise direction, and fully tighten the flapper
clamp. Rotate the nozzle 1.5 turns clockwise (down). Tighten the locknut (key 33).
D For high‐level switching, rotate the nozzle (key 6) counterclockwise (up) until it is in contact with the flapper seat
(key 11). Tighten the locknut (key 33).
18. Install the cover (key 15) with the attached cover gasket (key 16) and secure it with the cover screws (key 17) and
attached cover screw gaskets.
2100E Switch Maintenance Procedure
Refer to figure 6.
1. Drain the liquid from the cage and displacer assembly (key 1) and isolate it from the process. Shut off the power to
the electric switch assembly (key 49).
2. Remove the cover screw (key 61) and open the cover (key 60) on the switch housing (key 55). Replace the cover
gasket (key 57) if necessary.
3. Loosen the locknut (key 33) on the shaft clamp screw (key 41); then remove the switch arm (key 40) with the
attached machine screw (key 31), and locknut (key 33).
4. If changing from high‐level to low‐level switching or vice versa, from right‐ to left‐hand mounting or vice versa,
or a combination of both, loosen the set screws (key 56) and remove the electric switch assembly (key 49) and
plug (key 54).
5. Unscrew the pipe plug (key 2) or the bushing and sight window assembly (keys 4 and 5). With a 13 mm (1/2‐inch)
socket, loosen the locknut on the displacer rod end of the cage and displacer assembly.
6. Remove the torque tube assembly (key 7) and bearing (key 32) from the body block (key 3).
7. For changing from right‐ to left‐hand mounting or vice versa, remove the cap screws (key 30) that hold the switch
housing (key 55) to the body block (key 3).
8. Rotate the body block (key 3) 180 degrees on the cage and displacer assembly (key 1).
9. Install a new body block gasket (key 42), if necessary. Secure the switch housing (key 55) to the body block (key 3),
with the switch mounting ports pointing down, using cap screws (key 30).
10. Replace the torque tube O‐ring (key 25) if necessary. Install the bearing (key 32) and torque tube assembly (key 7)
into the body block (key 3), making sure the shaft of the torque tube assembly goes through the hole in the
displacer rod end of the cage and displacer assembly (key 1).
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