ABB 2600T Series Operating Instruction page 81

Fig. 56
9. Unscrew the fastening screws of the measuring cell and
remove the process flanges.
10. After each dismounting, the O-rings (3) must be replaced.
Fig. 57
11. Attach the flanges. To do this, executed the steps
described above in the reverse sequence.
When the transmitter is reassembled, it can be reconfigured.
The 266 transmitter is equipped with a self-adjustment
function and thus applies the previous configuration data
automatically.
12. Before the transmitter is switched on again, place the DIP
switches 1 and 2 (4) in the upper position. Connect the
transmitter to the energy supply and wait for 10 seconds;
then return the DIP switches 1 and 2 (4) to the lower
position.
Fig. 58
13. Screw the transmitter onto its fastening bracket and onto
the valve manifold. To correct a possible zero point offset,
we recommend that you execute the "PV-BIAS" function.
See chapter "Correction of measuring range beginning /
zero point offset".
266CRx, 266JRx, 266CSx, 266JSx | OI/266CXX/266JXX/HART-EN Rev. B 81