Maintenance; Returns And Removal; Pressure Transmitter Sensor; Removing / Installing The Process Flanges - ABB 2600T Series Operating Instructions Manual

15 Maintenance

If transmitters are used as intended under normal operating
conditions, no maintenance is required. It is sufficient to check
the output signal at regular intervals (in accordance with the
operating conditions), as described in the instructions in the
section "Operation resp. Configuration of the transmitter". If
deposits are expected to accumulate, the measuring
equipment should be cleaned on a regular basis, in accordance
with the operating conditions. Cleaning should ideally be
carried out in a workshop.
Repair and maintenance activities may only be performed by
authorized customer service personnel.
When replacing or repairing individual components, original
spare parts must be used.
Attention. The electronic components of the printed circuit board
can be damaged by static electricity (observe ESD guidelines).
Make sure that the static electricity in your body is discharged
when touching electronic components.
If a remote seal is mounted on the measuring equipment, it must
not be removed (please refer to the dedicated document).
Warning. Explosion-proof transmitters must be either repaired by
the manufacturer or approved by a certified expert following
repair work Observe the relevant safety precautions before,
during and after repair work. Only disassemble the transmitter to
the extent necessary for cleaning, inspection, repairs, and
replacement of damaged components.

15.1 Returns and removal

Defective transmitters sent to the repairs department must,
wherever possible, be accompanied by your own description of
the fault and its underlying cause.
Warning. Before removing or disassembling the device, check for
hazardous process conditions such as pressure on the device,
high temperatures, aggressive or toxic media, and so on. Read
the instructions in the sections "Safety" and "Electrical
connection", and perform the steps outlined there in reverse
order.

15.2 Pressure transmitter sensor

Essentially maintenance is not required for the transmitter
sensor. Anyway the following items should be checked
periodically:
— Check the integrity of the pressure boundary (no cracks
should be visible on the process connection or on the
process flanges.
— Check that there is no leakage from the sensor/flange
interface or from the vent/drain valves.
— The process flanges bolts (for 266DS/MS/PS/VS/RS
models) should not show excessive rust.
In case one of the check points above fails, please replace the
damaged part with an original spare part.
Please contact your local ABB office for spare parts support
information or refer to the spare part list. The use of non
original spare parts makes the warranty void. In case you want
ABB to perform the repair, please send back the transmitter to
your local ABB office complete with the return form that you
find in this manual appendix and include it with the device.

15.3 Removing / Installing the process flanges

1. Slacken the process flange screws by working on each in
a crosswise manner (hexagon head, SW 17 mm
(0.67 inch) for 266DS / 266PS / 266VS or SW 13 mm
(0.51 inch) for 266MS / 266RS).
2. Carefully remove the process flange, making sure that the
isolating diaphragms are not damaged in the process.
3. Use a soft brush and a suitable solvent to clean the
isolating diaphragms and - if necessary - the process
flange.
4. Insert the new process flange O-rings in the process
flange.
5. Attach the process flange to the measuring cell.
The surfaces of both process flanges must be at the same level
and at a right angle to the electronics housing (with the
exception of vertical process flanges).
6. Check that the process flange screw thread can move
freely: Manually turn the nut until it reaches the screw
head. If this is not possible, use new screws and nuts.
7. Lubricate the screw thread and seats of the screw
connection.
8. While performing the preliminary and final tightening of
the bolts, please act in a crosswise manner.
Attention. Do not use sharp or pointed tools.
Attention. Do not damage the insolating diaphragms.
Attention. In the case of oil and grease-free designs, clean the
measuring chambers again if necessary once the process flange
has been installed.
2600T Series Pressure transmitters | OI/266/PB-EN Rev. E 49
15 Maintenance