KROHNE UFM 500 ATEX EN - Manual (Page 12)

11
5.1.3 Changing power supply voltage (not for 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 turn display
unit carefully aside or remove the unit completely by taking out the flat cable connector.
3. Unscrew the two mounting screws B of the electronics unit as well as screw C, which
fixes the copper earth strip at the back of the housing. A screwdriver with a long shaft
(200 mm) can best be used to unscrew C (e.g. screwdriver type Philips No. 2).
4. Pull the electronics unit carefully out of the converter housing, till the SMB connectors of
the coaxial cables can be unplugged easily. Then remove the complete electronics unit.
5. The voltage setting of the power supply can be changed by turning the dummy dual-in-
line block (i.e. voltage selector, see Figure 6 on page 6) over 180° in its socket. The
position of the notch on the dummy dual-in-line block indicates the voltage setting. Also
see the sticker that is mounted on the mains transformer (see Figure 6).
6. Carefully insert the electronics unit back into the housing until the numbered SMB
connectors can be connected to the corresponding numbered SMB receptacles on the
electronics unit. Then mount the unit completely into the housing and fix the screws. First
C, then B and finally screw the display unit on the electronics via screws A, after the flat
cable connector is connected.
7. Screw the cover of the electronics compartment back into the housing.
Note the instructions of section 4.1 ("After opening") during reassembling.
IMPORTANT !
Carefully keep the coaxial cables to the side of the housing, while inserting or removing
the electronics unit into respectively from the converter housing. This is to prevent
damaging of the coaxial cables !
6. SPARE PARTS
UFC 500-EEx
electronics unit
Krohne part no. Type of mains fuse(s) Krohne part no.
230 Vac T125H250V (to IEC 60127-2) 5.06627.00.00
115 Vac
2.10680.00.00
T200H250V (to IEC 60127-2) 5.05678.00.00
200 Vac T125H250V (to IEC 60127-2) 5.06627.00.00
100 Vac
2.10681.03.00
T200H250V (to IEC 60127-2) 5.05678.00.00
24 Vac/dc 2.10681.00.00 T1.25A 250V (to IEC 60127-3) 5.09080.00.00
7. MAINTENANCE
The UFM 500 K-EEx ultrasonic compact flowmeters are maintenance free with regard to the
flowmetering properties.
Within the scope of the periodical inspections, which are required for electrical apparatus that
are installed and used in hazardous classified locations, it is recommended to check the
flameproof converter housing on signs of corrosion.