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6.4.7 Periodic inspections
Periodic inspections shall include the following:
assessment of the overall condition, taking into account explosion safety,
checking of the detectors – checking of the detectors is carried out without their disassembly, by
feeding a gas at a control concentration in order to validate the detector's response,
checking the alarm track for the selected alarm detectors.
The result of the review should be a report providing guidance as to:
the need to carry out maintenance works,
the need for calibration and adjustment of detectors.
6.4.8 Inspections arising from the conditions of use
In the case of an increased risk installation, it is assumed that there is a need to check the detectors after
each actuation and after every failure of the technology in the plant (which could afect the detector, but
does not trigger the reaction of the detectors – e. g. the outflow of hot steam, etc.). The criteria are set
individually, through negotiations with the technologists of the establishment, defined as the principles of
safe use of the system in the plant, taking into account its specificity and developed by the professionals
responsible for the safety of the plant or the processing line. Persons directly responsible for the safe
operation of the system should be trained regarding the safety regulations at the plant and required to take
appropriate action after the event of a faulty situation.
6.4.9 Ranking of detectors
In the case of extensive installations, for the detectors used, the user should perform adequate "validity
ranking". The position of a given detector in this ranking can be helpful in determining the period between
checks / calibrations.
6.4.10 Repairs and changes in the installation
They should be made taking into account section 6.2.2, and consultation with the manufacturer.
6.4.11 Recall from operation, periodic disconnection
In the case of a need to recall device from operation (e.g. for maintenance or repairs), observe the
regulations of section 6.2.2, as far as possible, in consultation with the manufacturer.
6.4.12 Replacement of consumables
Details of the lifetime of consumables can be found in table 9.
6.4.12.1 Sensor replacement
During operation there is a natural loss of metrological parameters of the sensors. Compensation of this
phenomenon occurs through periodic, systematic adjustment of the display (see calibration procedure)
– until the moment when it is necessary to exchange the sensor. It is assumed that the exchange should be
carried out after the loss of sensitivity below 50% of the initial sensitivity.
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User's Manual: POD-009-ENG R07