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Chapter 3 | Maintenance
Maintenance primarily comprises sensor calibration and changing any sensors
that no longer meet their initial metrological characteristics.
Since they are liable to affect detection reliability, the tasks
described in this chapter are reserved for authorized trained
personnel only.
Frequency of maintenance
Gas detectors are safety devices. OLDHAM recommends the regular testing of
fixed gas detection installations. This type of test consists of injecting the standard
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. The interval between
tests should not exceed 3 months. If a detector should fail to react
when
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
site
manager should put safety procedures in place on-site. INDUSTRIAL
SCIENTIFIC cannot be held responsible for their enforcement.
