Enclosure 6N Temperature switches
Page 7
CHAPTER
4
TROUBLESHOOTING
In-service problems are unlikely, but the following paragraphs suggest ways to verify any
problems that might arise:
1.
Failure to Switch
If application of temperature 10% greater than the adjusted setpoint fails to produce
actuation, first check for contamination in the process connection, and verify that the
expected temperature is reaching the sensing diaphragm or piston.
If the Belleville spring can be heard to audibly snap, but an ohmmeter indicates no
electrical switching, the cause is probably stuck or burned switch contacts, or the
switch element has moved away from the position where it was synchronized with
the snap action. Return the unit for repair.
If application of temperature 10% greater than the adjusted setpoint fails to produce
an audible snap of the Belleville spring, there is probably a mechanical failure or
binding due to contamination. Return the unit for repair.
2.
Calibration Shifts
If it is suspected that the setpoints have shifted, recheck them per Chapter 3. If you
verify unstable or drifting setpoints, return the unit for repair.