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3.2.1.1 POSITIONING HEIGHT
For heavier-than-air gases such as halocarbon and hydrocarbon refrigerants such as
R404A, propane, and butane sensors should be located near ground level.
With similar density or miscible gases (e.g. CO
head high (about 1.5 m).
For lighter-than-air gas the sensor needs to be located above the equipment to be
monitored on a bracket or high on a wall within 300 mm (12 in) of (or on) the ceiling –
provided there is no possibility of a thermal layer trapped under the ceiling preventing
gas from reaching the sensor.
Note: At very low temperatures (e.g., refrigerated cold store), some gases could become heavier
than air.
3.2.2 REFRIGERANT SPACES
In refrigerated spaces, sensors should be located in the return airflow to the evaporators on a
sidewall (below head-high is preferred), or on the ceiling, not directly in front of an evaporator.
In large rooms with multiple evaporators, sensors should be mounted on the central line between 2
adjacent evaporators, as turbulence will result in airflows mixing.
3.2.3 CHILLERS
In the case of small water- or air-cooled enclosed chiller units mount the sensor so as to monitor
airflow to the extract fans.
With larger models also place a sensor inside the enclosure under or adjacent to the compressors.
In the case of outdoor units:
For enclosed air-cooled chillers or the outdoor unit for variable refrigerant volume and
variable refrigerant flow (VRV/VRF) systems, mount the sensor so as to monitor airflow
to the extract fan.
With large units also place a sensor inside the enclosure under or adjacent to the
compressors.
In the case of non-enclosed outdoor units:
If there is an enclosed machinery section locate a sensor there.
In the case of units with enclosed compressors, mount sensors in the enclosures.
Where you have protective or acoustic panels mount the sensor low down under the
compressors where it is protected by the panels.
With air-cooled chillers or air-cooled condensers with non-enclosed condenser sections
it is difficult to effectively monitor leaks in the coil sections. With some designs it will be
possible using an airflow sensor to monitor airflow to the start–up fans in the front or rear
sections.
If there is a possibility of refrigerant leaks into a duct or air-handling unit install a sensor
to monitor the airflow.
Weatherproof sensors should be used for unprotected outdoor applications.
1592038710 Gas Leak Detector Modbus GB 01.12.2016
), sensors should be mounted about
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