SOR Vertical Displacer Top Mounted Series Level Switch - Manual (Page 13)

Form 425 (08.12) ©2012 SOR Inc. 13/16
 Is the control being operated within the nameplate limitations?
 Is power connected to the control? Is the power “On”?
 Is the controlled equipment functional and wired properly? Is the level control wired
properly? (See wiring continuity diagrams on Page 11 for proper wiring arrangement.)
 Is the control piped properly? The control must be piped so that it is within:
a. - 3° of the horizontal centerline for horizontal mount units.
b. - 3° of the vertical centerline for vertical mount units.
c. Ensure that all process piping is free of foreign material and that isolation valves
are fully open.
d. Pneumatic lines must be free of liquid and foreign matter.
 Has the factory-set position of the switching element(s) changed?
 Is the control damaged? Inspect for cracks, terminal corrosion or lead wire damage.
Replace the control if any damage is discovered.
 Does the control function when manually operated? Dry Contact Switches: Be
certain the dry contact switch actuation lever is not bent, and the calibration set
screw is positioned in the center of the lever. Manually move the magnet carriage.
The carriage must not bind as it is moved. This manual movement of the carriage
should cause switch actuation.
* Make sure that the interior of the switch is free of dirt, corrosion and scale. Check the:
a. Inside of the enclosing tube.
b. Attraction sleeve and stem.
c. Float or displacer.
d. Interior of the chamber and process connections.
* Ensure the factory-calibrated jam nut settings have not been moved and are carrying
the attraction sleeve in and out of the magnetic field.
 Call the factory or the SOR representative in your area if inspection doesn’t reveal
the
problem.
*NOTE: The enclosing tube gasket must be replaced each time the seal is broken.
Standard gasket P/N 3070-015, spiral wound gasket P/N 3070-014 (for high pressure,
high temperature and NACE units).
Troubleshooting
SOR switches are designed for long life and trouble-free operation. However, should you
suspect a malfunction, conduct the following inspection.
Do not open when an explosive gas atmosphere may be present.
If required, this product must be installed with an explosion proof breather
vent or drain per Agency requirements and the National Electric Code –
Article 501, Section F, paragraph 3.