Removing / Installing The Process Flange; Replacing The Measuring Cell - ABB 2600T Series Operating Instruction

15.6 Removing / installing the process flange

1. Unscrew the fastening screws of the process flanges in
cross pattern (hexagon socket wrench AF 13 mm (0.51
inch).
2. Carefully take off the process flanges so that the
separating diaphagms are not damaged.
3. Clean the separating diaphragms, and if necessary the
process flanges with a soft brush and a suitable cleaning
agent.
NOTICE – potential damage to parts!
Components can be damaged through the use of
the wrong cleaning tools.
Do not use any sharp-edged or pointed tools.
4. Insert new O-rings into the process flanges.
5. Fit the process flanges onto the measuring cell.
The flange surfaces of both process flanges must be
positioned in one plane and at right angles to the
electronics housing (vertical process flanges are the
exception).
6. Check the thread of the screws for the process flanges for
ease of movement. To do this, screw on the nuts by hand
to the screw head. If this is not possible, use new screws
and nuts.
7. Lubricate the screw thread and the seat of the threaded
union, e.g. with "Anti-Seize AS 040 P" (supplier:
P.W. Weidling & Sohn GmbH & Co. KG, Münster,
Germany).
IMPORTANT (NOTICE)
For the oil-free and grease-free version, after
installation of the process flange, the measuring
chambers must be cleaned again.
8. Installation of the process flanges
8.1. First tighten the screws / nuts of the process
flanges with a torque wrench to a pre-tightening torque
of MJ = 2 Nm (0.2 kpm), working in a cross pattern.
8.2. Then tighten the screws / nuts of the process
flanges with a pre-tightening torque of MJ = 10 Nm
(1,0 kpm), working in a cross pattern.
8.3. Retighten all screws / nuts (in a cross pattern), this
time with a total tightening angle of αA = 180°; in two
steps, 90° for each step.
8.4. Some transmitters have size M10 screws. Tighten
these screws with a total tightening angle of αA = 270°;
in three steps, 90° each step.
80 OI/266CXX/266JXX/HART-EN Rev. B | 266CRx, 266JRx, 266CSx, 266JSx

15.6.1 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 (1), with
which the transmitter is bolted onto the fastening bracket
or valve manifold.
Fig. 54
5. Open the housing cover of the electronics side, unscrew
both fastening screws (1) and pull out the electronics
module.
Fig. 55
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 (2), so
that the housing can be turned.
8. Turn the electronics housing counterclockwise until it can
be taken off.