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NOTE
An inline filter must be installed to protect every uncapped sample port, even if the
filter is locally mounted at the inlet tie point on top of the ACM 150 monitor. Filters
must be checked and replaced during periodic service.
3.5.
Optional capabilities
The following options can be included with or added to any ACM 150.
3.5.1. Sample points
The ACM 150 monitor can be purchased with 10, 20, 30, or 40 sample points. There is a
maximum of 40 sample points.
3.5.2. Automatic line leak test
Sample tube integrity must be confirmed whenever a new tube is installed. A leak test can
be done using compressed air. Honeywell recommends using a test gas to verify that the
tube is connected to the correct port and is not diluted by outside air leaking. After the
tubes are installed and tested, it is still possible to develop a leak in one of the sample
tubes connecting the ACM 150 monitor to a sample point. Tube leaks can develop for
various reasons, such as:
• disconnected at the sample point or the monitor and not reconnected
• disconnected and reconnected but not adequately seated or tightened
• accidentally cut by a contractor working in the facility
The automatic Line Leak Test is built into all ACM 150s; however, Honeywell may turn it
on or off in the configuration. For every sample line in use, the test requires a check valve
installed near the sample tube inlets, which is shown in the flow schematic that’s available
on request. The check valve passes flow in one direction only. During the line leak test, it
stops the flow of CDA from the ACM 150 monitor. This allows the entire sample tube to
be pressurized. To eliminate particulates, an in-line filter is installed between the check
valve and the inlet of each sample tube.
These check valves are available from Honeywell. They are SS check valves with 3/8-
inch tube fittings and a cracking pressure of 1/3 psi.
If employed, an automatic line leak is activated once a day at any time. CDA is directed
down each sample tube, one at a time. If the tube holds pressure, it passes the test. If a
tube fails to hold pressure, it fails the test, and the ACM 150 monitor displays a malfunction
message on the touchscreen.
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