Atest Gaz Sigma SmArt, User Manual

Page: 23 / 84

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6.4.1 Activities connected with the operation
Activities connected with the operation of detectors can be divided as follows:
verification – feeding the gas at a control concentration in order to validate the detectors
response,
resetting – during operation, the detector may indicate minor gas concentration despite the fact
that in reality there is no gas in the building. In such a situation, the reset function should be used
(available in devices cooperating with the detector, e.g. in the control unit), the use of this
function will result in change of the detector’s indication to zero. The reset function is available
only for a narrow range of detector’s indications (there is not hazard of resetting high
concentrations),
calibration – feeding the gas at a control concentration and clean air, in order to correct the
processing characteristics.
inspection – overall assessment of the technical condition of the detector, especially for the state
of explosion protection,
maintenance – activities aimed at the preservation or restoration of the technical condition that
allows continued operation (includes the explosion-proof construction).
All of the above steps can be carried out only by trained professionals, in accordance with the art, the
general safety rules and the special conditions of installations that should be included in the form of
appropriate procedures applicable in the plant.
The investor or persons indicated by them, responsible for safety in the plant, define the services allowed to
perform manual detector operation as above and the scope of work assigned to them (i.e. the whole
maintenance or breakdown into tasks).
6.4.2 Principles of safe operation of the detectors
Persons carrying out relevant activities should have appropriate qualifications:
• checking – operational service, manufacturer training,
• calibration and adjustment – the manufacturer's service.
• inspection, maintenance – the manufacturer's service.
Do not carry out any work where gas is expected to be a threat.
If despite the expected hazardous gas, it is necessary to disconnect the detectors, it is required to
maintain replacement measures by, for example, properly positioned portable detectors.
Conducting replacement measures is recommended in each case connected to the restriction of
the operation of the basic detection system.
The process of verification / calibration / adjustment should be well prepared and take as short as
possible.
6.4.3 Calibration
Checking of the detectors is carried out without their dismantling (in explosive areas even without
opening the housing). In some cases, it may be necessary, however, to mount the sensor to check
– applies to detectors having no 485 communication and detectors for the specific media (some
higher hydrocarbons).
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User's Manual: POD-009-ENG R07