www.trimodbesta.com
10
│
20
LTB010X
│
2016.04
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 an acoustic continuity tester or similar device 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.
Replacement of the switch 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.
Example:
Complete type number of the switch
B8 01 04
Incomplete data of replacement switch module
B8
Complete the type number with 01 04
►
B8 01 04
In the case of uncertainty on any point, please contact the local Trimod Besta agent or the
manufacturer.
Replacement of the switch module
The switch does not have to be removed from the process vessel in order to replace the switch
element.
1.
Observe chapter 1 «Safety instructions».
2.
Cut off power supply before opening enclosure cover! Be aware of the danger of hazardous
voltage!
3.
Loosen 2 cover screws with screwdriver.
4.
Check that terminals are not live.
5.
Disconnect wires, including grounding and equipotential connection.
6.
Loosen 2 Allan screws (Allan key 5 mm) on the side of the terminal block.
7.
Unscrew switch module (together with intermediate temperature piece, for H… and TD… types)
from the flange module.
8.
Make sure that the O-ring seals or flat gaskets fit properly.
9.
Fit replacement module (together with intermediate temperature piece, for H… and TD… types)
and tighten 2 screws.
10. Re-connect wires including grounding- and equipotential bonding connection (see connection
diagram inside cover and attached switch operating instruction).
11. Energize power supply only when hinged cover is closed!
Follow the installation instruction LTI004X «Replacement of the switch module»
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 (2011/65/EU - RoHS).
Disposal to be carried out according to environmental and local regulations.