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6.
Maintenance
Level controllers must be periodically (min. 1x annually) inspected and cleaned.
Procedure:
1. Detach the flange connection and remove the controller.
2. Check the float and mechanism for damage and contamination.
3. 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.
4. In the case of floats with protective bellows, the bellows must be removed before cleaning and
should be cleaned separately, both internally and externally.
5. Inspect the float and mechanism for complete deflection, as well as for smooth and unrestricted
operation.
6. In the event that it becomes necessary to replace individual components, please note that only
original spare parts, split pins, float, controller module, etc. may be installed.
7. After completion of the cleaning / inspection work, the controller module must be checked for
correct function by means of simultaneous complete deflection of the float, followed by recording in
the inspection log book.
8. In order to guarantee the absence of leaks between process vessel / float chamber, the flange
gasket must be replaced after each dismantling.
9. After carrying out the inspection work, the device is re-assembled at the intended location.
Adjustment screws in the interior of the housing must not be adjusted!
7.
Replacement of the controller module
Defective controller modules must be replaced with new, works-tested units. In order that the complete type
designation can be stamped on the type plate, the complete designation of the existing controller must be
specified at the time of ordering. If a complete identification of the controller is not possible, then the
manufacturer should be consulted before dispatching the complete device.
In the case of uncertainty on any point, please contact the local Trimod Besta agent or the
manufacturer.
Replacing the controller module
Important notes: The level controller does not have to be removed from the process vessel in order
to replace the controller module.
Procedure:
1. Observe Chapter 1 "Safety instructions".
2. Detach the hose or pipe screwed connection from the valve body.
3. Remove socket head cap screws from housing with Allen key (5 mm).
4. Carefully remove the controller module from the flange.
5. Fit a new gasket on the flange and check that it is correctly seated.
6. Place the replacement controller module (incl. gasket) on the flange and tighten the socket head
cap screws with the Allen key.
7. Assemble the hose or pipe screwed connection in the valve body and check that it is seated
correctly.
8. Carefully allow the supply air (pressure) to build up.
8.
Fire protection
Trimod Besta level controllers must be protected against external fire hazard.
9.
Disposal
Trimod Besta level controllers are free of any asbestos-containing or otherwise hazardous materials.
Disposal must be carried out in an environmentally-friendly manner and in accordance with the local
regulations.
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LTB005X │ 2020.11
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