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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.
3.1 Maintenance Frequency
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. TELEDYNE OLDHAM
SIMTRONICS cannot be held responsible for their enforcement.
The OLCT 10N can be calibrated either:
• Manually
• Automatically
The manual calibration must be done only after each sensor or detector
replacement.
A manual calibration must be followed by an automatic calibration.
Please find below the different calibration gas concentrations.
NPO10NGB
Revision J.1
OLCT 10 N
DIGITAL GAS DETECTOR
USER MANUAL
9
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