ABB 2600T Series Instruction Manual page 129

2 6 0 0 T S E R I E S | P R E S S U R E T R A N S M I T T E R S | O I/ 2 6 6/ F F - E N R E V. E
12 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.
CAUTION
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 section).
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.
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.
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 at the end of this manual and include
it with the device.
Figure 50: DP and P style pressure transmitter construction
Removing/Installing the process flanges
• 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).
• Carefully remove the process flange, making sure that the
isolating diaphragms are not damaged in the process.
• Use a soft brush and a suitable solvent to clean the isolating
diaphragms and - if necessary - the process flange.
• Insert the new process flange O-rings in the process flange.
• 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).
• 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.
• Lubricate the screw thread and seats of the screw
connection.
• While performing the preliminary and final tightening of the
bolts, please act in a crosswise manner.
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