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English
2.1 Location
The detector should be mounted where the gas to be detected is most likely to be pre
-
sent. The following points should be noted when locating gas detectors:
•
To detect gases which are lighter than air, such as methane, detectors should be
mounted at high level and Crowcon recommend the use of a collector cone
(Part
No. C01051)
.
•
To detect heavier than air gases, such as flammable vapours or CO
2
, detectors
should be mounted at low level.
•
When locating detectors consider the possible damage caused by natural events
e.g. rain or flooding. For detectors mounted outdoors Crowcon recommend the
use of a Spray Deflector
(Part No. C01052)
.
•
Consider ease of access for functional testing and servicing.
•
Consider how the escaping gas may behave due to natural or forced air currents.
Mount detectors in ventilation ducts if appropriate.
•
Consider the process conditions. For example, butane is normally heavier than air,
but if released from a process which is at an elevated temperature and/or pres
-
sure, the gas may rise rather than fall.
The placement of sensors should be determined following advice of experts having
specialist knowledge of gas dispersion, the plant processing equipment as well as
safety and engineering issues.
The agreement reached on the locations of sensors
should be recorded
.
WARNING
This detector is designed for use in Zone 1, Zone 2, Zone 21 and Zone 22
hazardous areas, and is certified
II 2 GD Ex db IIC T6 Gb. Installation must
be in accordance with the recognised standards of the appropriate authority
in the country concerned.
For further information please contact Crowcon. Prior to carrying out any
installation work ensure local regulations and site procedures are followed.
