2100 and 2100E Liquid Level Switches
Instruction Manual
Form 5039
December 2005
10
Type 2100E Switch Maintenance
Procedure
WARNING
Refer to the WARNING at the
beginning of the Maintenance section.
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 screws (key 44) and the cover
(key 39) from the switch housing (key 38). Replace
the cover gasket (key 43) 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 45) and remove the electric switch
assembly (key 49) and plastic plug (key 51).
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) and lock
washers (key 28) that hold the switch housing (key
38) 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 38) to
the body block (key 3), with the switch mounting
ports pointing down, using cap screws (key 30) and
lock washers (key 28).
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).
11. 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 N
S
m (15 and 20 lbf
S
ft).
12. 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 bushing and
sight window, to between 68 and 136 N
S
m (50 and
100 lbf
S
ft).
13. Select a switch mounting port that will provide
the desired switching action. Screw the electric
switch assembly into the selected port until the
switch assembly groove aligns with the threaded
hole for the set screw (key 45). Position the electric
switch contact directly below the machine screw
(key 31). Install and tighten the set screw (key 45) to
anchor the electric switch assembly.
14. Insert the cap plug (key 51) in the unused switch
mounting port. Install the set screw (key 45) in the
mounting port of the switch housing (key 38).
15. Install the switch arm (key 40) on the shaft of
the torque tube assembly (key 7) with the head of
the shaft clamp screw (key 41) pointing toward the
top process connection and the switch arm parallel
to the top of the electric switch assembly (key 49).
Tighten the locknut (key 33) on the shaft clamp
screw to secure the switch arm.
16. Thread the machine screw (key 31) in or out of
the switch arm (key 40) until it touches the contact of
the electric switch assembly (key 49), then tighten
the locknut (key 33).
17. Secure the cover (key 39) to the switch housing
(key 38) with the two cover screws (key 44).
