Bacharach HGM300 User Manual

vi Instruction 3015-4148
The HGM300 should be centrally located in the mechanical room and be readily accessible for easy visual
monitoring and servicing. Air sample tubing may be run in lengths up to 500 feet. The fresh air purge line
should draw from an area that does not contain any refrigerant gas and cannot exceed 300 feet in length. The
exhaust line should run to an out side location if possible. The length of the exhaust line cannot exceed
300 feet.
Ideally, two to three pick up points spaced around each chiller will provide sufficient coverage. It may be
necessary to perform a “smoke” test of the mechanical room to determine the best locations. The smoke test
would provide the pattern of air currents present in the mechanical room.
HGM300 / RDM800 Refrigerant Gas leak monitor mechanical room placement
The RDM800 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 RDM800 can be located up to 4500 feet
from the HGM300. The RDM800 is the man machine interface by which you program the HGM300,
acknowledge alarms and observe conditions inside of the mechanical room. Note that there are two additional
alarm relay contacts in the RDM800 that can be programmed to alarm with “leak, spill, evacuate, fault or
monitor on”.
Response to the Presence of Multiple Refrigerants
Technically speaking, the HGM300 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.
RDM800
Remote Display
Module outside of
mechanical room
HGM300
Halogen
Gas
Monitor
Outside Hallway
Machine Room
Sample Inlet Pickup Points
Chiller
Exhaust Fan
Sample Inlet
Pickup Point
Aux. Horn/Strobe
Remote Alarm
Fresh air purge
from area away
from refrigerant
gas

Bacharach HGM300 Specifications

General

Brand	Bacharach
Model	HGM300
Category	Measuring Instruments
Language	English