TM 10-6665-297-13&P
2-1
LOCATION OF DETECTORS
5.
Corrosive gases: The destructive effects of corrosive gases may in some cases be minimized by
locating the detector in a protected area and conditioning samples to reduce corrosiveness as they
are drawn by vacuum to the detectors. Where moisture or liquid-type line filters are used, special
care should be taken during installation to ensure that such devices are accessible for periodic
servicing if required.
6.
Water, moisture, dust, and dirt: Detectors should be mounted where water cannot enter and fill
the housing to prevent exposure of the sensor element to air. Likewise, exposure to moisture, dust,
and dirt should be minimized by locating detectors away from points where large amounts of such
contaminants fill the air. Small overhanging or surrounding covers may be devised to protect
detectors from the intrusions of dust and dirt in severe environments. A special moisture-proof
detector (Model #0023-7317) should be installed where extreme humidity presents a special
problem.
2-2
LOCATION OF CONTROL UNITS
If possible, locate control modules or enclosures in dry, clean, nonhazardous areas; ideally, in plant
engineer's control room or other place where temperature, moisture, corrosive and explosive
atmospheres, or other conditions will not endanger personnel or hinder the maintenance and operation
of the equipment. If a source of compressed air is readily available for cabinet purging, W- series
(wall-mount) enclosures may be located in Division 2 hazardous locations. * The CD800X (explosion-
proof housing) may be safely located in Division 1, Groups B, C, and D, hazardous environments. In
any case, length of wire should be considered with respect to installation cost. If fans, sprinklers, door
closers, ovens, or other devices are to be controlled by the control module relays, the length of the
control wiring for these purposes should also be considered.
2-3
LOCATION OF WARNING DEVICES
Remote annunciators such as bells, buzzers, lamps, etc., should be located where they may be readily
seen or heard by personnel responsible for remedial actions, and preferably should be near the control
cabinet where the nature of the condition and the appropriate response may be more readily perceived.
Alarm devices should also be located in or near detectors to alert all personnel in the vicinity of an
alarm. Audible alarms should be installed not less than one foot from the ceiling and, wherever
possible, not less than eight feet from the floor.
2-4
CONTROL MODULE INSTALLATION
Control modules and control module assemblies are installed in accordance with
Where permitted by governing code enforcement authorities.
23-9617
7/1/76
2-4
