Maintenance
Control Unit Models 9010 LCD and 9020 LCD
37
GB
8 Maintenance
The apparatus does not need particular special maintenance if occasional operations for cleaning
the dust and periodic functional checks are excluded [SEE PROCEDURE AT SECTION 6.2,
Access Code 1, SECTION 6.4, Access Code 3, step 12 ].
For applications with sensors / transmitters of SIL 2, the calibration intervals should be re-
duced in an appropriate manner.
Check the calibration of the sensors / transmitters connected to the inputs of the
Control Unit three times a year or more frequently in the event that hazardous conditions
are detected in the working conditions of the installation. Use the appropriate calibration
gas as specified in the Calibration Data Sheet.
The following checks need to be made with the same frequency: The efficiency of the
FAILURE relay contacts and the WARNING and ALARM relays.
These checks also need to be carried out with the board with opto-isolated outputs, in the
case in which the relays are installed outside the Control Unit.
In the event of a failure, the Control Unit will have to return to MSA for tests.
MSA ITALY shall not be held liable for damage to items or persons if such checks are not
made periodically as indicated above.
For general applications, the calibration checks can be done twice a year.
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