Annual Inspection and calibration of Temperature Switch High High TSHH


TASKS TO BE PERFORMED:

1. Annual Inspection and calibration of Temperature Switch High High.
2. Inspect Switch for any physical damage.
3. Ensure Switch is securely mounted.
4. Check temperature Switch and thermowell are securely fastened.
5. Inspect electrical cable and conduit for any physical damage.
6. Check Switch covers are secure.
7. Isolate Switch.
8. Remove to workshop for calibration if required.
9. Connect multimeter set to read resistance to the switch output terminals.
10. Place sensing bulb in temperature bath and adjust the bath temperature slowly to the specified alarm temperature.
11. Check the switch operates at the correct set point, adjust as required.
12. Reduce temperature setting on bath and ensure switch resets, note the amount of hysteresis on the switch.
13. If adjustments are made, repeat steps 9 to 12 till correct set point is achieved
14. Complete Instrument Calibration Sheet.
15. On competition refit switch in plant.

Remove to workshop for calibration if required

9. Connect multimeter set to read resistance to the switch output terminals.
10. Place sensing bulb in temperature bath and adjust the bath temperature slowly to the specified alarm temperature.
11. Check the switch operates at the correct set point, adjust as required.
12. Reduce temperature setting on bath and ensure switch resets, note the amount of hysteresis on the switch.
13. If adjustments are made, repeat steps 9 to 12 till correct set point is achieved.
14. Complete Instrument Calibration Sheet.
15. On competition refit switch in plant.
16. Connect Millivolt or Decade box to input terminals of switch. (TC or RTD).
17. Inject signal and slowly increase until signal reaches setpoint.
18. Check that switch has operated and alarms has been received at control room.
19. Adjust switch as required until desired setpoint is achieved.
20. Reduce input signal slowly until switch resets and note the amount of hysteresis present.
21. Ensure the hysteresis is within the required specifications of the switch.
22. Remove test input signal and reconnect switch.
23. De-isolate sensing lines.
24. Return Switch to service.
25. Sign-off Work Permit and return to operations.
26. Report all findings to supervision and document in CMMS.



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