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.
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