Specifications

Halogen Gas Monitor – MultiZone Remote Display
Instruction 3015-5157
8
HGM-MZ / HGM-RD Refrigerant Gas leak Monitor Mechanical Room Placement
The HGM-RD 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 HGM-RD can be located up to 4500 feet
from the HGM-MZ. The HGM-RD is the man machine interface by which you program the HGM-MZ,
acknowledge alarms and observe conditions inside of the mechanical room. Note that there are two additional
alarm relay contacts in the HGM-RD that can be programmed to alarm with “leak, spill, evacuate, fault or
monitor on”.
Response to the Presence of Multiple Refrigerants
Technically speaking, the HGM-MZ is a refrigerant level monitor, not a gas analyzer. You must program the
instrument to test for a specific refrigerant in each zone, and it will only return accurate concentration readings
for that particular refrigerant. If a leak occurs of another refrigerant gas type, the instrument may return
deceptive readings.
Most applications only require detection of a single refrigerant and the problems that are associated with
monitoring multiple gasses are rarely an issue. If there is a possibility of multiple refrigerants leaking in the
same sampling zone, you should consider carefully which refrigerant compound you program the instrument
to monitor.
HGM-RD
Remote Display
Module outside of
mechanical room
HGM-MZ
Halogen
Gas
Monitor
Outside Hallway
Machine Room
Sample Inlet Pickup Points
Chiller
Exhaust
Sample Inlet
Aux.
Horn/Strobe
Fresh air purge
from area away
from refrigerant
gas