ENGLISH
Pag. 13
2. Installation site prearrangement
2.1 General precautions
At the mounting and installation phase, be sure all safety precautions have been considered.
Always remember how important the correct positioning of gas detectors is to get the op-
timum response.
Be careful:
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Never to install gas detectors close to air intakes or fans causing strong air currents.
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The detectors are attached to a firm base to prevent vibration that can damage them,
producing unreliable results. Although the electronics comply with the electromag-
netic compatibility rules, it is advised to keep the detectors at a distance from any
radio frequency senders (such as radio links or similar).
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That detectors are placed in a convenient location for future maintenance and calibra-
tion requirements
2.2 Precautions based on the gas to detect and environmental inhibitors
When preparing the installation site, it is necessary to take into account the nature of the gas
to be detected and the presence of chemical agents in the environment
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Petrol vapours and NO2 are gases heavier than air and tend to spread downwards; the
detector should be placed at 30 cm from the floor to maximise the effectiveness of the
detection. CO has a specific weight similar to air’s; it is a very toxic gas and to get a re-
liable protection, the detector should be placed at the breathing level, approximately
1.50 m above the floor. The CO+PETROL VAPOUR detector comes with an extension kit
to mount the Petrol Vapour sensor 30 cm off the ground and the CO head at nose level.
Correct detector positioning is essential to ensure prompt and accurate detection.
Figure 1) SMART P with extension kit
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Catalytic sensors (Pellistors) offer excellent output linearity up to 100% LFL and have
an estimated lifetime of 4 years. Catalytic sensor performance may be altered by the
Содержание S2398CO
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