10
46-635 External Cage Displacer Actuated Liquid Level Switches
4.1.2 Check sensing unit
1. Check to be certain liquid is entering float chamber.
A valve may be closed or piping plugged.
2. With liquid in chamber, proceed to check level sensing
action by removing switch housing assembly and
enclosing tube.
Caution: Unit must be normalized to atmospheric pressure before
removing enclosing tube.
3. Inspect attraction sleeve and inside of enclosing tube for
excessive corrosion or solids buildup which could restrict
movement, preventing sleeve from reaching field of magnet.
4. Never change the settings of the jam nuts which position
the attraction sleeve.
5. If control has a flanged cage, remove parting flange. Check
spring and displacer assembly for freedom of movement.
Check for collapsed or liquid filled displacer. If displacer is
determined to be filled or collapsed, contact the factory.
4.1.3 Check complete unit
Reassemble unit. Reconnect power supply and carefully
actuate switch mechanism manually (using a non-conduc-
tive tool) to determine whether controlled equipment will
operate.
Caution: With electrical power on, care should be taken to avoid
contact with switch leads and connections at terminal
block.
If all components in the control are in operating condi-
tion, the trouble must be (and should be) located external
to the control. Repeat inspection of external conditions
previously described.
NOTE: If difficulties are encountered which cannot be identified,
consult the factory or your local representative for assistance.
A complete description of the trouble should be provided
along with information concerning your piping and mounting
arrangement, plus a description of your operating sequence.
Sketches or photographs showing the installation are also
beneficial.
When communicating about your control, be certain to
always specify the complete model and serial numbers.
Model Flange Bolting Enclosing Tube
C74 180 –200 ft-lbs
220 –225 ft-lbsH15 135–150 ft-lbs
H32, H52 285–320 ft-lbs
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