Oldham OLCT 10N, User Manual

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3- Maintenance 15
Chapter 3 | Maintenance
Maintenance primarily involves sensor calibration and changing any sensors
that no longer meet their initial performance characteristics.
Since they are liable to affect detection reliability, the tasks
described in this chapter are reserved for authorized trained
personnel only.
Inspection and maintenance shall be carried out in accordance
with standard EN/IEC 60079-17. The instructions contained in the
ATEX marking shall be observed (see Chapter 8).
When first powered up or after a sensor replacement, wait for 1
hour before performing a calibration.
It is impossible to calibrate an OLCT 10N within 10 minutes after a
power cycle.
Maintenance Frequency
Gas detectors are safety devices. OLDHAM 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.