Annual Function Test and Calibration of Level Switch Low LSL


TASKS TO BE PERFORMED:

1. Annual Function Test and Calibration of LEVEL SWITCH LOW ALARM.
2. Inspect Level Switch for any physical damage.
3. Ensure Level Switch is securely mounted.
4. Inspect electrical signal cable for any physical damage.
5. Check cable gland and terminal box cover are secure.
6. Remove Level switch cover and inspect switch mechanism.
7. Visually inspect Switches for any short circuit damage.
8. Check all terminations are secure.
9. Visually inspect switches for excessive wear on actuating lever.
10. Visually inspect switches for misalignment of adjusting screw at point of contact between screw and lever.
12. Adjust mechanism to compensate for this condition.
If this cannot be corrected replace switch immediately.
13. Isolate Level Switch Low from the process by closing the bridle manual isolation valves where fitted.
14. Where possible drain the process fluid from the chamber to a pre-determined level where the Low Alarm should have activated. Tee in clear plastic pipe and strap to chamber in order to view level indication.
15. Close the drain valve.
16. Check that the Switch has activated. Adjust as required.
17. Check that the Low Alarm has been received in control Room.
18. If adjustment are made in step 16, refill the float switch chamber with process fluid or liquid of an equivalent S.G. and repeat steps 14 through 17 till the correct setting is obtained.
19. Ensure all drain points are securely closed off.
20. Check all disturbed connections for leaks using soap solution.
21. De-isolate the Level Switch and put back on line equalising the level in the float chamber with the vessel.
22. Re-instate all bridle valves.
23. Checks that the Alarm annunciation has been accepted reset.
24. Replace switch cover ensuring seal or gasket is in good condition.
25. Complete Instrument Calibration Sheet.
26. ENSURE ANY OVERRIDE IS REMOVED AND AUGUST SYSTEM RETURNED TO NORMAL MODE.
27. Sign-off Work Permit and return to operations.
28. Report all findings to supervision and document in CMMS.

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