84
266CRH / 266CRT, 266CSH / 266CST
MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
… 11 Repair
… Removing / installing the process flange
Replacing the measuring cell
1. Disconnect the transmitter from the process via the valve
manifold or the shut-off valves.
2. Open the vent valves to vent the measuring cell.
3. Disconnect the energy supply and the wiring supply to the
transmitter.
4. Unscrew and remove the 4 fastening screws (Figure 5,
Pos.
1
), with which the transmitter is bolted onto the
fastening bracket or valve manifold.
M10815-01
1
Figure 5: Fastening screws
5. Open the housing cover of the electronics side, unscrew both
fastening screws (Figure 6, Pos.
2
) and pull out the
electronics module.
M10825-01
2
Figure 6: Housing cover / electronic module
6. The electronics module is connected via a ribbon cable with
connector to the measuring cell; carefully unplug this
connector from the electronics module.
7. Unscrew the electronics housing of the pressure transmitter.
To do this, unscrew the fixing screws (Figure 7, Pos.
3
), so
that the housing can be turned.
8. Turn the electronics housing counterclockwise (Figure 7,
Pos.
A
) until it can be taken off (Figure 7, Pos.
B
).
M10826-01
3
A
B
Figure 7: Electronic housing
9. Unscrew the fastening screws of the measuring cell and
remove the process flanges.
10. After each dismounting, the O-rings (Figure 8, Pos.
4
) must
be replaced.
4
4
M10827-01
Figure 8: Process flanges
11. Attach the flanges. To do this, executed the steps described
above in the reverse sequence.
