Total
Customer Satisfaction is our primary objective at General
Monitors. Through presale technical seminars, electronic
documentation, customer product training seminars, maintenance
programs and the Technical Services Group, we want you
as a customer for life. Here you'll find a variety of
tools to assist you with our products.
Where
should gas detectors / sensors be located?
This is the single most asked question of General
Monitors. Unfortunately, there are no hard and fast
rules for installing gas detectors since there are so many variables
that must be taken into account.
The following guidelines should be considered: 1.
The vapor density or relative weight of gases: Sensors
should be located near the floor for gases or vapors
three or four times heavier than air. They should
be installed near the ceiling or roof to detect
lighter than air gases.
2.
Ignition sources: Gas detectors should be located between
a potential leak source and a source of ignition,
preferably closer to potential leak sources.
3.
Air currents: The general guideline is to locate
the gas sensor where the prevailing air currents contain
the maximum concentration of the gas being monitored.
4.
Dispersion of gas: Generally, gas detectors should not
be far removed from any potential source of escaping
gas. Liquids of low volatility, in particular, require
the location of the gas sensor in the immediate area
of the vapor source. Liquids with high flash points,
or slow rates of dispersion may produce a low reading
if the gas sensor is any distance from the spill or
break.
5.
Temperature limitations: All detectors have ambient
temperature limitations and the installation of
the gas sensor must be within the specified range.
6.
Vibration: Vibration may be damaging to the detector
and must be considered in selecting the gas sensor location.
In general, this means anchoring the detector to a
wall or firm base rather than to a motor housing.
7.
Wiring: Good instrument wiring practices should
be incorporated in the sensor installation, and
wiring separate from other AC wiring.
8.
Accessibility: Since it is desirable to calibrate
on a periodic basis, gas sensors should be installed
in a location permitting reasonable access.
9.
Moisture protection: Sensors should be mounted where
they are protected from immersion or direct contact
with water.
10.Dust protection:
Sensor dust covers should be used if sensors are
mounted in dirty or dusty environments.
