User Guide

Single Zone Gas Monitor
8 P/N: 3015-4256 Rev 10
2.3.2. Tubing Considerations
Use ¼ in. outside diameter (0.040 in. wall) flex tubing for all air lines (P/N 0304-2743 or equivalent for
HGM; P/N 0304-2742 or equivalent for AGM). The tubing should be clean and free of moisture or other
contaminants. The tubing should be cut cleanly with a sharp knife and care should be taken not to distort
the tubing end.
IMPORTANT! Due to the reactive nature of refrigerant and ammonia gasses, it is
important to use materials that will not absorb the gas as it passes through the sampling
system. The use of unauthorized tubing or any other materials in the gas-sampling stream
may lead to erroneously low readings.
All tubing bends should have a radius of no less than 5" to ensure proper airflow. If kinks or obstructions
occur in the line, the monitor may not function properly.
2.3.3. Connecting the Gas Sample Line
Please refer to the section titled Suggested Location of Sampling Point (page 3) to learn more about
where to take a gas sample.
The gas-sample line can be up to 500 ft (152.4 m) in length. The combined length of the sample line and
exhaust line (if one is used) should not exceed 500 ft. The end of this line should be placed near the
potential leak source and positioned to reduce the possibility of mists, aerosols, oil, water, dust, or other
contaminates from being drawn into the monitor. For added protection, a termination filter (P/N 3015-3420)
supplied with the monitor must be attached to the end of this line.
CAUTION: The introduction of contaminants through the gas-sample line can result in
serious and permanent damage to the monitor.
Depending on type of use and location of lines, the optional end-of-line water stop filter assembly can be
used to prohibit moisture from entering the intake lines. Place the end of the intake line into the blue
receiver of the end-of-line water stop and tighten sufficiently.
NOTE: Only one filter assembly, either the line-end filter or end-of-line water stop, should
be used for each line.
2.3.4. Connecting the Exhaust Line
The exhaust line carries the exhausted gas sample away from the monitor and is required if the monitor is
located in a confined, poorly ventilated area. If no purge line is used (ammonia monitor) you must vent the
exhausted gas sample away from the monitor to prevent erroneous readings due to improper zeroing of
the detector. Note that if the monitor is exposed to an unusually high level of gas for prolonged periods of
time, its charcoal filter (Halogen Gas Monitor Only) will quickly become saturated and no longer able to
clean the purge-air of refrigerant gas.
The exhaust line can be up to 100 ft (30.52 m) in length. Ideally, this line should terminate outdoors in a
location that is not exposed to the elements. Connect the exhaust line to the monitor by firmly pushing the
tubing onto the barbed fitting. If the exhaust line terminates outside the building, position the tubing so
that no water or moisture can enter the line. Note that this line does not require a termination filter.