Instruction Manual
D200119X012
2100 and 2100E Liquid Level Switches
June 2017
12
2100 Switch Maintenance Procedure
WARNING
When disconnecting any of the pneumatic connections, natural gas, if used as the supply medium, will seep from the unit
and any connected equipment into the surrounding atmosphere. Personal injury or property damage may result from fire
or explosion if preventative measures are not taken, such as adequate ventilation and the removal of any ignition sources.
Refer to figure 5.
1. Drain the liquid from the cage and displacer assembly (key 1), then isolate it from the process. Shut off the supply
pressure and bleed any trapped supply and output pressure from the nozzle block assembly (key 8).
2. Loosen the cover screws (key 17) and remove the cover (key 15). Replace the cover gasket (key 16) and the cover
screw gaskets (key 20) if necessary.
Note
Magnetic attraction between the magnet (key 14) and the flapper (key 12) can be adversely affected by the presence of foreign
material between the magnet and flapper. Before performing any inspection or correction step, inspect the magnet. If necessary,
clean the magnet thoroughly. If cleaning requires removing the magnet or magnet bracket (key 13), perform step 17 of the
maintenance procedure; then perform the calibration check procedure to ensure that the unit operates properly.
3. Loosen the nut holding the flapper and clamp assembly (key 12) to the shaft of the torque tube assembly (key 7).
Remove the flapper and clamp assembly and, if necessary, replace the flapper seat (key 11) or magnet (key 14). The
magnet is attached to the magnet bracket (key 13) with a machine screw (key 27).
4. Loosen the locknut (key 33), remove the nozzle (key 6), and if necessary, replace the nozzle O‐ring (key 26). If
changing supply pressure is the only other maintenance performed, skip to step 15.
5. Remove the pressure plug (key 9) and, if necessary, replace the pressure plug O‐ring (key 24).
6. Unscrew the pipe plug (key 2) or the bushing and sight window assembly (keys 4 and 5). With a 13 mm (1/2‐inch)
hex nut driver, loosen the locknut on the displacer rod end of the cage and displacer assembly (key 1).
7. Remove the torque tube assembly (key 7) and the bearing (key 32) from the body block (key 3). If necessary,
replace the torque tube O‐ring (key 25).
8. If it is necessary to replace the nozzle block assembly (key 8) or the nozzle block gasket (key 18), these parts are
attached to the back plate (key 10) with cap screws (key 30) and lock washers (key 28).
9. If changing mounting position from right‐hand to left‐hand or vice versa, remove the cap screws (key 30) and lock
washers (key 28) that hold the back plate (key 10) to the body block (key 3). Then rotate the body block 180
degrees on the cage and displacer assembly (key 1). Install a new body block gasket (key 19) if necessary, and
secure the back plate (key 10) to the body block with lock washers and cap screws so that the greatest back plate
overlap points are toward the bottom cage connection.
10. If changing from low‐level to high‐level switching or vice versa, remove the machine screws (key 31), flat washers
(key 29), and magnet bracket (key 13). Install the magnet bracket on the opposite side of the nozzle block assembly
(key 8) and secure it with flat washers and machine screws.
11. 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).
12. With a tool inserted through the bottom process connection of the cage and displacer assembly (key 1), move the
displacer to its upward travel limit and then tighten the locknut on the displacer rod end to between 20 and 27 NSm
(15 and 20 lbfSft).
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