KROHNE IFC 090F Converter EEx-ATEX EN - Manual (Page 21)

ALTOFLUX IFC 090 F-EEx and ALTOFLUX IFC 090 F / i-EEx 21
5 Service
See Sect. 6 or contact your (local) KROHNE sales representative for the ordering information of
spare parts or replacements of IFC 090…-EEx electronics units and/or power fuses.
5.1
General information for replacements
IMPORTANT !
The following instructions must be followed carefully, if the IFC 090/…-EEx
signal converter housing has to be opened respectively closed again!
Before opening
Make absolutely sure there is no explosion hazard!
If necessary provide a ”Gas-free certificate” !
Make sure that all connecting cables are safely isolated from the power supply !
When the instructions above are strictly followed, the cover (with glass window) of the electronics
compartment may be removed. First unscrew the recessed head screw of the interlocking device
by a hollow-head screw wrench size 3, until the cover can rotate freely. Unscrew the cover with
the special plastic wrench (black) that is supplied with the apparatus.
After opening
The copper ground strip at the back of the electronics unit must be securely screwed to the
housing (back-end of electronics compartment) by screw SE (see figure below). The electronics
unit is screwed into the electronics compartment by two screws D. Before screws SE and D can
be accessed, the display unit must be removed via screws A.
Before the cover is screwed back into the housing, the screw-thread must be clean and well-
greased with an acid and resin-free grease, e.g. silicone grease.
Screw the cover as tight as possible into the housing by hand, until it cannot be opened by hand
anymore. Screw the recessed head screw of the interlocking device tight.
IFC 090-EEx electronics unit after removal of display unit
A
Power fuse in fuse-holder
D
D
Power supply
PC-board
A
Mains transformer
B
Note:
Safe earth
connection
SE
Flat cable of display unit
SE
C
Signal converter housing