2100 and 2100E Liquid Level Switches
Instruction Manual
Form 5039
December 2005
7
Table 3. Type 2100 Troubleshooting Guide
Fault
Possible Cause
Correction
1. Nozzle-flapper throttles (flapper moves in
response to change in liquid level but does
not completely cap or uncap nozzle).
1.1 Nozzle adjusted too high.
1.1 If nozzle prevents flapper from coming in
full contact with magnet, repeat the
Calibration procedure.
Perform the Calibration Check procedure to
ensure that the unit operates properly.
1.2 Verify that the top surface of the magnet is
parallel with the flapper and that the magnet
is in full contact with the flapper when the
flapper is against the magnet. If the above
conditions do not exist, repeat the Calibration
procedure.
Perform the Calibration Check procedure to
ensure that the unit operates properly.
2. Nozzle-flapper fails to snap open.
2.1 Liquid level not changing in the expected
direction.
2.1 Be certain liquid level in the displacer
cage is changing in the expected direction.
3. Nozzle-flapper leaks when shut off.
3.1 Surface of nozzle seat or nozzle worn or
damaged.
3.2 Nozzle adjusted too low.
3.3 Incorrect alignment of nozzle and flapper.
3.1 Inspect surface of flapper seat (key 11,
figure 5), and nozzle (key 6, figure 5); replace
parts if necessary.
3.2 Inspect nozzle-flapper when flapper is
being held by magnet. If nozzle is not seated
on flapper seat, loosen locknut (key 33, figure
5) and rotate nozzle counterclockwise until it
is seated.
3.3 Inspect surface of nozzle seat (key 11,
figure 5). This surface should be parallel with
the opening in the end of the nozzle (key 6,
figure 5). Correct as necessary.
4. Switch fails to activate upon high or low
level depending on action selected.
4.1 Foreign material in cage.
4.2 Clamp and shaft assembly loose on torque
tube assembly.
4.3 Torque tube assembly failure.
4.1 Flush cage to remove foreign material.
4.2 Perform step 4 of reassembly procedure
in maintenance section. Tighten clamp nut on
clamp and shaft assembly to between 20 and
27 N
S
m (15 and 20 lb
S
ft).
4.3 Perform operational test procedure
Replace torque tube assembly if it fails
operational test.
For Type 2100, shut off and bleed
supply pressure from the switch
before attempting any maintenance
procedures. For Type 2100E, shut off
the power to the electric switch
assembly before attempting any
maintenance procedures.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
The displacer cage should be flushed periodically to
remove deposits or sludge that may affect proper
operation. The frequency of flushing depends on the
nature of the process liquid. Before flushing, close
the isolating valves and drain the cage. Flush from
one of the top connections to one of the bottom
connections. Also, remove the pipe plug (key 2) or
the bushing and sight window (keys 4 and 5), and
flush from a top connection through the pipe plug or
sight window connection.
Inspect the vent or vent screen (key 23) or vent line
periodically to ensure that the vent or vent line is not
plugged.
Table 3 lists various Type 2100 switch problems and
possible solutions for them. The table is valid for
either high-level or low-level switching action and for
any supply pressure range. If a correction step
requires replacement of worn or damaged parts,
