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URD20SS_en.doc - rev. 0
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gas detectors – URD20SS
24/09/2010
Gas detection systems for industrial environments
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Sensors lifetime
Sensor average lifetime (see technical characteristics) is referred to a typical usage
in a pollution-free environment. Presence of a high concentration of pollutants can
shorten the lifetime of the sensing element.
Once the detection system starts up, it has to be supplied with energy during all the
lifetime of its sensors.
Seasonal use of the detection system is not recommended.
Installation
The relative density of carbon dioxide is about one and a half times that of air, so it
tends to collect at floor level in closed, unventilated environments.
Therefore, the sensor must be installed about 30 cm above the floor level.
Take into consideration the following specific installation guidelines, as well as
the above instructions, for location of the detectors.
The detectors must be installed:
1. where accidental gas leakages are possible
2. at least 1.5m away from heat sources or from vent holes
3. not in spaces where ventilation is poor and where gas pockets may form
4. away from hindrances to natural gas flow
5. away from equipment that may leak gas during normal operations
6. in environments with a temperature range of -20°C to 50°C and relative
humidity below 90% (non-condensing)
7. Disconnect equipment from the power supply when mounting and
dismantling detectors.