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4
Preventive maintenance
Periodic checks enable the equipment and installation to remain in conformity and ensure reliable
detection. This chapter describes what preventative action should be taken and at what intervals.
Inspection and maintenance are carried out in accordance with EN/IEC 60079-17 standard in
force or with other national standards.
4.1 Maintenance schedule
Gas detectors are safety devices. TELEDYNE OLDHAM SIMTRONICS recommends the regular
testing of fixed gas detection installations. This type of test consists of injecting the calibration gas
into the detector at a sufficient concentration to activate the pre-set alarms. It is to be understood
that this test is in no way a replacement for a detector calibration.
The frequency of gas tests depends on the industrial application where the detector is in use.
Frequent inspections should be made in the months following the commissioning of the installation,
and should then become more widely spaced provided that no significant deviation is observed.
If a detector should fail to react in contact with the gas, calibration is essential. The frequency of
calibrations shall be appropriate according to the results of the tests (humidity, temperature, dust,
etc.); however, it must not exceed one year.
The general manager should put safety procedures in place on-site. OLDHAM cannot be held
responsible for their enforcement.
4.2 Actions
4.2.1
OLCT 60
Periodic maintenance comprises the following actions:
• Removal of dust from the sensor and its optional protective cover with a dry cloth only.
No water or solvents should be used. Severely dusty sensors should be replaced
immediately.
• For use in dusty explosive atmospheres, the user should undertake full and regular
cleaning to avoid the build-up of dust. The maximum permissible thickness of a dust layer
must be less than 5 mm.
NPO60GB
Revision F.2
OLCT 60
FIXED POINTGAS MONITOR
USER MANUAL
21
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