Atest Gaz Sigma SmArt, Руководство пользователя

Страница: 22 / 84

www.atestgaz.pl
Incorrect cable routing can lead to reducing the device's immunity from electromagnetic
interference.
6.3 Start-up of the installation
6.3.1 Overview of explosion safety
Only after a positive assessment of the method of connection and restoring flameproof properties of the
detector, it is permissible to connect the detector to power and the transmission line.
6.3.2 Handover inspection
The handover inspection should provide for the examination of the detectors and checking the whole alarm
track for each detector.
The handover inspection should include suggestions as to the date of the first survey inspection. The date of
the first survey inspection should be no longer than 6 months (the period of 3 months is recommended).
6.3.3 Commissioning of the gasometric installation
It is recommended that – if possible – the commissioning of a gasometric installation should take
place in conditions where there is no risk of explosion – e.g. during a standstill of the technological
installations. However, if this is not possible, it is necessary to observe all the rules relating to the
safe handling of electrical equipment in hazardous areas.
In the case of large installations, it is recommended to successively connect detectors and their
gradual start-up. This makes it easier to find and remove any installation errors.
The behaviour of the detector after being powered and its operation are described in subsequent
sections of this documentation.
After wiring of electrical connections and their admission to commissioning, the installation is ready for
operation.
6.4 Periodical operations
This description applies to the principles of operation of gas detectors after they have been installed
correctly (see section 6.2.2) and after commissioning inspection and the commissioning of the installation
(see section 6.3).
During the operation of the gasometric system, it is necessary to be aware of the fact that the detector
– and most of all the sensors – are elements susceptible to aging and environmental influences. Therefore,
the maintenance process must be carried out systematically. In general, it applies to two aspects:
changes in the characteristics of detectors,
maintaining the technical condition guaranteeing explosion proof performance (flameproof) of the
installation.
Changing the characteristics of the detectors may in turn relate to three issues:
moving the clock – towards the concentrations of positive or negative nature,
changes in sensitivity,
increasing the response time – as a result for example of the sinter contamination through which
the gas migrates to the detector.
p. 22|34
User's Manual: POD-009-ENG R07