KROHNE ALTOFLUX IFM x080 K ATEX EN User Manual

Page 27

ALTOFLUX IFM x080 K-EEx and ALTOFLUX IFM x080 K / i-EEx

5.3

Replacement of power fuse(s)

The power fuse(s) of the different IFC 090…-EEx electronics units (regular or MODIS) have a
different rating and are located on slightly different locations on the power supply printed circuit
board. Only the power fuse on the 100…230 Vac power supply version of the regular IFC 090-
EEx electronics unit can be reached without removing the complete unit out of the housing (only
the display unit has to be unscrewed).

Regular IFC 090-EEx with 24 Vac/dc power supply

Note:

Before commencing work, read the instructions in Sect. 5.1 ("Before opening"). Then
continue as follows:

1. Remove the cover of the electronics compartment.
2. Unscrew the two screws marked with A of the display unit and turn it carefully aside.
3. Disconnect the 2-pole field circuit connector (item B) as well as the 3-pole electrode circuit

connector (item C). See figure in Sect.5.1 and 5.2.

4. Unscrew the two mounting screws D of the electronics unit and screw SE, which fixes the

copper ground strip to the integrated aluminum dividing wall at the back of the electronics
compartment. Use a screwdriver with a long shaft (

≥

200 mm) like type Philips No. 2 for

screw SE. Then take out the electronics unit, but be careful with the connecting cables, so
that they do not get damaged.

5. The defective power fus e(s) F1 and/or F2 (see following figure) can be replaced now. The 24

Vac/dc power supply uses two sub-miniature fuses type TR 5 that are rated T1.25 A in
accordance with IEC 127-3 publication (part No. 5.09080.00.00).

6. Reassemble in reverse order (points 3 through 1).

Note:

Read the instructions of Sect. 5.1 ("After opening") during reassembling.

IFC 090-EEx electronics unit with 24 Vac/dc power supply

F1 and F2 fuses of power supply