2100 and 2100E Liquid Level Switches
Instruction Manual
Form 5039
December 2005
9
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 (0.5 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 N
S
m (15 and 20 lbf
S
ft).
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 N
S
m (50 and 100 lbf
S
ft).
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.
