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5.
Maintenance
Level switches must be periodically tested and cleaned, at least once annually.
Procedure:
1.
Before opening the housing, disconnect the supply voltage; electric shocks can be life-
threatening.
2.
Process vessels / float chambers must be brought to atmospheric pressure before work is carried
out and must be appropriately vented. If necessary, lower the fill level. If the switch is mounted in
a chamber, close the corresponding shut-off valves and, depending on the requirement, empty or
vent the chamber.
3.
Loosen the flange connection and remove the switch.
4.
Check the float and mechanism for damage and contamination.
5.
Remove deposits and metal particles by means of suitable and approved methods. Care must be
taken to ensure that no mechanical damage occurs as a result of the cleaning.
6.
In the case of floats with protective bellows, the bellows must be removed before cleaning and
should be cleaned separately, both internally and externally.
7.
Check the float and mechanism for complete deflection, as well as for smooth and unrestricted
operation.
8.
In the event that it becomes necessary to replace individual components, please note that only
original spare parts, split pins, float, switch module, etc. may be installed.
9.
After completion of the cleaning / inspection work, the switch module must be checked for correct
function by means of a test device or similar with simultaneous deflection of the float, followed by
recording in the inspection log book.
10. In order to guarantee the absence of leaks between process vessel / float chamber, the flange
seal must be replaced after each dismantling.
11. After carrying out the inspection work, the device is re-fitted at the intended location.
6.
Replacing the switch insert
Defective switch elements must be replaced by new, works-tested units.
The case of uncertainty on any point, please contact the local Trimod Besta agent or the
manufacturer.
Replacing the switch insert
Important notes: The switch does not have to be removed from the process vessel in order to replace
the switch element.
Repairs to explosion-proof level switches may only be carried out by specialists who have been
approved by the relevant local authorities. The replacement of a switch insert must be recorded
accordingly.
Procedure:
1.
Observe chapter 1 «Safety instructions»
2.
Follow the installation instruction LTI005X «Replacement switch insert type X...»
7.
Fire protection
Trimod Besta level switches must be protected against external fires.
8.
Disposal
Trimod Besta level switches are free of asbestos or otherwise hazardous materials. Disposal to be
carried out according to environmental and local regulations.
www.trimodbesta.com
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LTB004X │ 2016.08
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