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266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
10 Maintenance
Safety instructions
WARNING
Bodily injury!
Transmitters with explosion protection must be either
repaired by the manufacturer or approved by a certified
expert after the repair.
•
Comply with the relevant safety regulations and take the
appropriate safety precautions before, during, and after
repair work.
WARNING
Bodily injury!
The device can be operated at high pressure and with
aggressive media. Any medium that squirts out can cause
severe injuries.
•
Depressurize the pipeline/tank before opening the
transmitter connection.
NOTICE
Damage to components!
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 before touching electronic components.
General
If pressure transmitters are used as intended under normal
operating conditions, no maintenance is required.
It suffices if the measuring range start and/or the spat are
checked at specific intervals – depending on the operating
conditions. If deposits are expected to accumulate in the
measuring cell, the measuring cell should be cleaned on a regular
basis, in accordance with the operating conditions.
Preferably the measuring cell should be cleaned in a workshop.
Note
For transmitters in safety-relevant applications in accordance
with IEC 61508, verification in accordance with the paragraph
'Acceptance test' in chapter 'Functional safety in accordance
with IEC 61508' is prescribed at fixed time intervals.
Repair and maintenance tasks must only be executed by
employees of an authorized customer service organization.
For replacement and repair of individual components use
original parts.
Measuring cell of the multivariable
transmitter
Normally the measuring cell of the transmitter is essentially
maintenance-free.
Nevertheless the following should be checked regularly:
•
The gaskets of connected lines must be intact. There
must not be any visible cracks on the process flanges.
•
There must be no leaks at the connection points between
sensor and flange and on the vent / drain valves.
•
The screws on the process flanges must not show any
corrosion.
If defects are detected in the inspection described above, the
parts in question must be replaced with original spare parts. If
information on spare parts is required, contact an ABB office or
refer to the spare parts list. If spare parts are used that are not
original parts, the guarantee is invalidated.
Cleaning
When cleaning the exterior of meters, make sure that the
cleaning agent used does not corrode the housing surface and
the seals.
To avoid static charge, a damp cloth must be used for cleaning.
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