6
12.2
95-8616
INSTALLATION
The gas detector can be installed either in a stand-alone
configuration as a loop powered device, or it can be
connected to a UD10/UD20 Universal Display Unit.
NOTE
The gas detector housing must be electrically
connected to earth ground. A dedicated earth
ground wire is provided on the transmitter for
connection to earth ground or to a grounded
housing.
The detector must always be installed per local
installation code.
Before installing the gas detector, define the following
application details:
IDENTIFICATION OF VAPOR(S) TO BE DETECTED
It is necessary to always identify the vapor(s) of interest
at the job site. In addition, 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.
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 sensor installation points.
If the vapor of interest is lighter than air, place the sensor
above the potential gas leak. Place the sensor 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 if possible.
Final suitability of possible gas detector locations
should be verified by a site survey. If any questions
arise regarding installation, please contact the factory.
DEVICE MOUNTING ORIENTATION
The gas detector must be mounted in a vertical position
only, with the sensor pointing down (See Figure 5).
IMPORTANT
The sensor should be oriented with the LEDs
facing forward so they are easily visible to
personnel within the area. To ensure correct
orientation (the LEDs are not visible when power
is off), position the GND lug on the left hand side
and the calibration notch to the front. Note that the
LEDs are located directly above the calibration
notch.
GREEN LED
CALIBRATION NOTCH
B2436
GND LUG
Figure 5—Correct Mounting Orientation for the GT3000
