Installation
Mounting the Detector
The ability of the detector to sense the target gas and efficiently control the ventilation system
depends greatly upon proper selection of the mounting location. This detector monitors the
area around it by sampling the air that passes by the sensor. Since the sensor is mounted
inside a housing, air must diffuse through the intake vents and pass by the sensor on its way
out the exhaust vents. Therefore, the detector should be positioned where it can sample air
that contains a target gas concentration representative of the average value in that area.
When determining the mounting location, give special consideration to the following guidelines.
• Use one sensor per target gas for each area to be covered.
• Always prioritize locations with the highest occupation density.
• If using remote transmitters, do not locate any further than 1000 feet from the control
unit.
• The types of gases each unit is designed to monitor have densities approximately equal
to that of air. For maximum safety, mount the unit at the average breathing height –
approximately 5 to 7 feet from the floor.
• Avoid mounting locations that would not be representative of the average gas value in
that area. These include but are not limited to locations near doorways, fans, ventilation
inlets and outlets, and areas with air velocities in excess of 3.3 ft/s (1 m/s).
• Avoid locations that would allow direct contact with water. Mounting the unit near
outside garage doors may allow rain to hit the unit when the door is open.
• Avoid locations that are directly in the outlet air vents of heaters or air conditioners.
• Avoid mounting locations with normal ambient temperatures below -4°F (-20°C) or
above 122°F (50°C).
• Do not allow exhaust from engines to flow directly on the unit. Each unit is designed to
sense gas concentrations that are 300 to 1000 times less concentrated than the gas
levels found in engine exhaust. Also, engine exhaust contains high levels of other
components. These components can shorten the useful life of the sensor if they contact
the sensor before being diluted by the room air volume.
• Avoid mounting locations where the unit may be hit by passing vehicles. If the unit must
be mounted in these locations, provide a shielding cage around the unit for protection.
IOM01
Rev 1.0 – December 22, 2020 14
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