STATUS SCIENTIFIC CONTROLS
FGD3 Infrared Gas Detector Heads
TD06/024
Issue:
7
Change Note:
1904
Page 6
3 Installation
IMPORTANT
The instrument will monitor the gases in the environment after being powered for a few
minutes; however it should be left for a minimum of 2hrs before it is calibrated.
3.1 Siting the Sensors
Mounting positions for detector heads need to be considered individually, some points
for consideration are:
•
Ensure all sensors are mounted to allow routine calibration and maintenance to
be carried out as required.
•
Ensure the proposed site will not interfere with movement of existing equipment,
e.g. cranes, doors etc
•
Install all cables neatly and securely.
•
Sensors for detecting gases that are lighter than air should be positioned at a
high level.
•
Sensors for heavier than air gases should be located at a low level.
•
Avoid siting the sensors adjacent to potential sources of radio frequency
interference, e.g. radio transmitters, control switchgear, motors etc.
•
Avoid mounting the instrument where it may be subjected to sudden transients in
ambient temperature (e.g. above a heater/radiator).
3.2 Wire Termination
All connections should be made according to the appropriate sensor or loop diagram
for the configuration required. It is advised that ‘Bootlace Ferrules’ or ‘flat blade crimps’
be used for tidy and reliable connections of wires into the Detector Head connectors.
3.3 Cable Routing
Due to the low signal levels generated by gas detectors it is recommended that all
wiring to the sensors be segregated away from AC mains or other high voltage/power
lines to avoid interference.
