Tubing Considerations; Connecting The Gas Sample Line - Bacharach HGM-SZ Installation & Operation Manual

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!
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" (127 mm) 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 4) 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 (152.4 m). 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.
Figure 2-3. Using PTC Connectors: Connecting (Left) and Disconnecting (Right)
P/N: 3015-4256 Rev 13
Due to the reactive nature of refrigerant and ammonia gasses, it is
The Single Zone monitor uses push-to-
connect (PTC) style connectors.
To insert sample lines, firmly push the
appropriate tubing into the hole in the
center of the connector until it seats in
the connector. Refer to the figures at
the left.
To remove tubing
connector, push and hold the spring-
loaded collar
simultaneously withdraw the tubing.
Refer to the figures at the right.
from a PTC
inwards, then
Single Zone Gas Monitor
9