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4 Instruction 3015-4256
Suggested Location of Sampling Point
At the point of a refrigerant leak the gas is nearly pure. As the refrigerant is dispersed into the air, the gas
molecules diffuse causing a dilution of the original concentration. The HGMSZ measures the refrigerant
concentration at the point the sample is collected. Therefore, if the termination of the collection line is not
at the exact point of the refrigerant leak, then the monitor will read a diluted mixture of the refrigerant
gas and air.
It should also be noted that halogen refrigerant gas is heavier than air and tends to collect below the point
of a leak. Therefore a sample taken near the floor will have a greater concentration of gas than that
collected above the source of a leak. Consequently, the sampling point should ideally be located as close as
possible to the source of a potential leak. If this is impractical, then the alarm set points should be
adjusted to compensate for the dilution of the refrigerant gas.
The HGMSZ should be mounted outside of the mechanical room or at least just inside of a door to the
room. This is the “split architecture design” for safety of the operator. The monitor should be readily
accessible for easy visual monitoring and servicing. The gas-sample line can be up to 50 ft (15.2 m) in
length. If the area around the monitor is not well ventilated, then an optional exhaust line can be run to
an outside location. The length of the exhaust line cannot exceed 50 ft (15.2 m).
It may be necessary to perform a “smoke” test of the mechanical room to determine the best monitoring
point. The smoke test would provide the pattern of air currents present in the room.
HGMSZ Refrigerant Gas Leak Monitor Mechanical Room Placement