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instAllAtion
The gas detector housing must be electrically
connected to earth ground. A dedicated earth
ground terminal is provided on the UD10.
The detector must always be installed per local
installation codes.
Before installing the gas detector, define the following
application details:
IDENTIFICATION OF vApOR(S) TO BE DETECTED
It is necessary to identify the vapor(s) of interest at the
job site. The fire hazard properties of the vapor, such
as vapor density, flashpoint, and vapor pressure should
be identified and used to assist in selecting the optimum
detector mounting location within the area.
For cross sensitivity information, refer to each gas
detector's corresponding instruction manual. Refer to
Table 5 in the Specifications section for a list of gas
detectors and their corresponding instruction manuals.
4.3
noTe
IDENTIFICATION OF DETECTOR mOUNTINg
lOCATIONS
Identification of the most likely leak sources and
leak accumulation areas is typically the first step in
identifying the best detector mounting locations. In
addition, identification of air current/wind patterns
within the protected area is useful in predicting gas leak
dispersion behavior. This information should be used
to identify optimum detector installation points.
If the vapor of interest is lighter than air, place the detector
above the potential gas leak. Place the detector close
to the floor for gases that are heavier than air. Note
that air currents may cause a gas that is slightly heavier
than air to rise under some conditions. Heated gases
may also exhibit the same phenomenon.
The most effective number and placement of detectors
varies depending on the conditions on site. The individual
designing the installation must often rely on experience
and common sense to determine the detector quantity
and best locations to adequately protect the area. Note
that it is typically advantageous to locate detectors
where they are accessible for maintenance. Locations
near excessive heat or vibration sources should be
avoided.
Final suitability of possible gas detector locations
should be verified by a job site survey.
The gas detector must be mounted with the sensor in
the correct orientation as shown in Table 2.
If the UD10 faceplate is not correctly oriented, it can
be rotated at 90 degree increments by pulling the
electronic module from the four mounting posts that
secure it to the junction box and repositioning it as
desired. Note that the module is held in place by a
compression fitting – no screws are involved.
Table 2—Device Orientation
Device
GT3000
PiR9400
PiRECL
OPECL
505/CGS
C706x
NTMOS
6
Orientation
Vertical with Sensor Pointing Down
Horizontal
Horizontal
Horizontal (Fixed to a vertical post)
Vertical with Sensor Pointing Down
Vertical with Sensor Pointing Down
Vertical with Sensor Pointing Down
95-8618
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