Detector Body; Installation - Prosense Safevader Series User Manual

Detector body

The detector enclosure has two cable entries located at the bottom of enclosure for connecting
the power source, signal output and relay contacts to associated signalling equipment. There
are two mounting holes incorporated into the transmitter housing.
Diagram 2: Detector body and size (mm)

Installation

Gas detectors should be mounted where a potential hazard of gas is most likely to be present.
The following points should be noted when locating gas sensors.
• When locating detectors consider the possible damage caused by natural events e.g. rain or
flooding.
• Consider ease of access to the gas detector for functional testing and servicing.
• Consider how escaping gas may behave due to natural or forced air currents.
Note: The placement of gas detectors should be determined following the advice of experts
having specialist knowledge of gas dispersion, experts having knowledge of the process plant
system and equipment involved safety and engineering personnel. The agreement reached on
the location of detectors should be recorded.
Each gas has different nature depending on their density. The density of which is lower than air,
such as hydrogen, methane or ammonia the sensor head must be located above a possible leak
or at the highest points at which major concentrations of gas may be found. The gases and
vapours with a density greater than air, the sensor head must be installed beneath a possible
leak or at the lowest points at which such gases and vapours may be present.
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