KROHNE ALTOSONIC V EEx EN - Manual (Page 12)

ALTOSONIC V 8
3. Service and maintenance
3.1 Introduction
Both UFC-V/…-EEx types are maintenance regarding flowmetering properties. Within the
scope of the periodical inspections, required for electrical instruments that are installed and
used in hazardous classified locations, it is recommended to check the flameproof enclosure.
Contact KROHNE for the ordering information of spare parts or replacements of UFC 500/…-
EEx electronics units and/or power fuses.
The following instructions must be followed carefully, if the flameproof
UFC-V/…-EEx Ultrasonic Flow Converter box has to be opened
respectively closed again !
Before opening instructions:
• Make absolutely sure that there is no explosion hazard!
• Gas-free certificate!
• Make sure that all connecting cables are safely isolated from the power supply!
• Allow the prescribed waiting time of at least 30 minutes to elapse before opening of the
flameproof enclosure.
When the instructions above are strictly followed, the internal wrenching bolts of the cover of
the flameproof box may be unscrewed and the cover can be opened. Take care that the
weight of the opened cover does not solely support on the two hinges.
1. Flameproof box
2. Cover of flameproof
box
3. Hinge (2x)
4. UFC 500…-EEx
electronics unit (5x)
5. Heating element
6. Intrinsically safe SMB
receptacles
7. Rail with non-I.S.
connection terminals
8. EMC-rail with shielding
terminals
Figure 2 UFC-V/LT-EEx Ultrasonic Flow Converter (inside of box)
After opening instructions:
• The copper grounding strip at the back of the electronics unit must be securely screwed
to the longest brass mounting bushing by screw C (see figure below). The electronics unit
is screwed to the two shorter brass mounting bushings by two screws B. Before screws B
and C can be accessed, the display unit must be removed via screws A first. See figure
below.
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4 5
6
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