Maintenance; Returns And Removal; Pressure Transmitter Sensor; Pressure Transducer Replacement - ABB 266HSH Operating Instructions Manual

10 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 – Potential damage to parts. 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 – <Bodily injury>. 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.

10.1 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 – General risks. 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.

10.2 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 or from the
vent/drain valve.
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.
Attention – Potential damage to parts. Do not use sharp or
pointed tools. Do not damage the insolating diaphragms.

10.3 Pressure transducer replacement

If the pressure transducer needs to be replaced proceed as
follows:
1. Insulate the transmitter from the process by acting on the
manifolds or on the insulation valves
2. Open the vent valves to allow sensor depressurization
3. Disconnect the power supply and disconnect the wiring
4. Disconnect the transmitter from the bracket unscrewing the
fixing bolts.
5. Open the communication board/HMI compartment cover
6. The communication board is connected to the sensor via a
flat cable and a connector. Remove the communication
board and gently disconnect the connector
7. Release the tang screw completely and rotate the housing
until its complete removal
8. The 266 can reconfigure itself with the previous configured
parameters thanks to the auto-configuration functionality.
9. Before powering on the transmitter raise dip-switches 1 and
2 in up position. Connect the transmitter to power supply,
wait ten seconds and lower dip-switched 1 and 2.
10. After installing the transmitter on the bracket and
connecting it to the manifold, perform a PV zero bias.

10.4 Electronic replacement

If the electronic module needs to be replaced proceed as follows:
1. Insulate the transmitter from the process by acting on the
manifolds or on the insulation valves.
2. Open the vent valves to allow sensor depressurization.
3. Power the transmitter off by disconnecting the wiring.
4. Open the windowed cover and gently remove the electronic
module with integrated LCD by acting on the removal slots
placed on the external part of the module itself (see picture
below). This operation shall be carried out very carefully by
using a dedicated removing tool or a thin, flat screwdriver.
Figure 14: Slot for electronic module removal
5. Gently disconnect the sensor flat cable from the rear of the
electronic module.
6. Connect the sensor flat cable to the new electronic module
with dip switch 1 in up position.
7. Connect the transmitter to power supply, wait ten seconds
and lower dip-switch 1 to 0 position. 266 can reconfigure
itself with the previous configured parameters thanks to the
auto-configuration functionality.
2600T Series Pressure transmitters | OI/266/LowP-EN Rev.A 25
10 Maintenance