2100 and 2100E Liquid Level Switches
Instruction Manual
Form 5039
December 2005
8
refer to the appropriate maintenance procedure in
this manual for disassembly and reassembly
instructions.
Type 2100E switch problems are solved through
common electrical troubleshooting procedures. Fault
4 of table 3 is also pertinent for the Type 2100E.
Operational Test (Types 2100 and
2100E)
Establish a periodic operational test of the switch to
ensure that:
a. the torque tube is functioning as a continuous
spring element;
b. there is an absence of excessive friction;
c. there is no contact with the mechanical stops,
and;
d. the torque tube is still effectively transmitting
force and motion to the Type 2100 flapper and
clamp assembly, or to the Type 2100E switch
arm assembly.
This test should be conducted with no process fluid
in the cage using the following procedures:
1. Make sure the Type 2100 switch flapper and
clamp assembly (key 12, figure 5) or the Type
2100E switch arm (key 40, figure 6) is tight on the
shaft of the torque tube assembly (key 7).
2. Grasp and lift, then immediately release, the
following:
D
The Type 2100 switch flapper and clamp
assembly (key 12, figure 5), 10 to 13 mm (0.375 to
0.5 inch) from the nozzle (key 6, figure 5), or
D
The Type 2100E switch arm (key 40, figure 6),
10 to 13 mm (0.375 to 0.5 inch) from the contact of
the electric switch assembly (key 49, figure 6).
3. The torque tube spring system is functional if the
Type 2100 switch flapper and clamp assembly, or
the Type 2100E switch arm, bounces at least two
cycles in a reversing rotary motion.
Type 2100 Switch Maintenance
Procedure
WARNING
Refer to the WARNING at the
beginning of the Maintenance section.
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
nearby 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
