KROHNE UFM 500 ATEX EN User Manual

Page 10

Figure 6: Power supply version 115/230 V AC.

b) 24 V AC/DC version

Before commencing work,

note the instructions in Section 4.1 ("Before opening")

Then continue as follows:

1. Loosen the interlocking device and remove the cover of the electronics compartment.
2. Unscrew the two screws A (see figure 5 in section 4.1) of the display unit and disconnect

the display unit via the flat cable connector (see the right picture of Figure 5 on the
previous page).

3. Unscrew the brass earth strip (screw C) with the and the mounting screws B of the

electronics unit. Pull the unit out until the SMB connectors of the coaxial cables can be
disconnected from the electronics. Then take out the complete electronics unit. Be careful
with the coaxial cables, so that they do not damage while removing the electronics unit
from the flow converter housing.

4. The mains fuses F1 and F2 (see Figure 7 on the next page) can be replaced now. The

24 V AC/DC power supply uses two sub-miniature fuses rated T1.25A in accordance with
IEC 127-3 publication.

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

Note the instructions of section 4.1 ("After opening") during reassembling.

Mains transformer

115/230 V

version

Mains fuse F1 (in fuse -holder)

Sticker with fuse rating

Voltage selector

SIDE OF DISPLAY UNIT

Indication of

voltage selector

(black dot = notch)