MGS-350 Manual
6509-9000 Rev 1
15
NOTE:
This instrument can be equipped with a semiconductor
sensor for the detection of refrigerant, combustible and VOC
gases. Semiconductor sensors are not gas specific and respond
to a variety of other gases including propane exhaust, cleaners,
and solvents. Changes in temperature and humidity may also
affect the sensor’s performance.
2.1. General Placement Guidelines
NOTE:
The MGS-350 should be installed plumb and level and
securely fastened to a rigid mounting surface.
Sensors must be located within the appropriate wire lengths from the
central control unit (if used). In all cases the sensor supplied is designed
for maximum sensitivity to a particular gas. However, in certain
circumstances false alarms may be caused by the occasional presence
of sufficiently high concentrations of other gaseous impurities. Examples
of situations where such abnormalities may arise include the following:
•
Plant room maintenance activity involving solvent or paint fumes
or refrigerant leaks.
•
Accidental gas migration in fruit ripening/storage facilities
(bananas - ethylene, apples - carbon dioxide).
•
Heavy localized exhaust fumes (carbon monoxide, dioxide,
propane) from engine-driven forklifts in confined spaces or close
to sensors.
Bacharach recommends setting the alarm delay to minimize false
alarms.
2.2. Machinery Rooms
There is no absolute rule in determining the number of sensors and their
locations. However, a number of simple guidelines will help to make a
decision. Sensors monitor a point as opposed to an area. If the gas leak
does not reach the sensor then no alarm will be triggered. Therefore, it
is extremely important to carefully select the sensor location. Also
consider ease of access for maintenance.
The size and nature of the site will help to decide which method is the
most appropriate to use. Locations requiring the most protection in a