Honeywell ACM 150 - Servicing the Filters

ACM 150
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10.3.1.3. Qualified personnel
Services described in this chapter should only be performed by authorized or trained
personnel, as defined in Levels of ACM 150 users and as indicated in the following
paragraphs.
10.3.1.4. Contaminated areas
During normal use, parts of the ACM may contain residual amounts of hazardous
materials, and service operations may generate contaminated waste. This is especially so
for monitors frequently exposed to hazardous material. Examples of service items that
may be contaminated are cleaning materials, gas cells, filters, valves, pump parts, tubing,
and ZnSe windows.
Service people should ensure that the ACM is safe before attempting repairs. The
minimum recommended personal protection includes gloves and safety glasses. The user
is responsible for safely and correctly disposing of contaminated waste.
10.3.2. Servicing the filters
The rate of particulate accumulation varies with the local conditions. Follow the
recommended intervals for replacing filters unless your periodic inspections/tests indicate
that more frequent replacement is necessary.
10.3.2.1. Cabinet air filters and fans
Cooling fans are installed in the main cabinet and the lower pump cabinet.
Each cooling fan has a filter with a removable plastic cover. These filters should
accumulate dust at the same rate. Therefore, they should all be replaced simultaneously
with the ACM 150 monitor off-line. When replacing filters, wipe the dust off the plastic
cover. Also, inspect the fans to ensure they operate correctly and have no accumulated
dust. Wipe accumulated dust from the fans. Replace fans that do not operate correctly,
i.e., do not spin freely.
10.3.2.2. Internal gas cell filter
The gas cell filter is part of the mechanical pump assembly, Figure 12, located in the lower
pump cabinet. Replace it according to the recommended schedule or more frequently if
required. The ACM 150 monitor should be taken off-line for this service. If not, expect to
generate a Service Status message when temporarily interrupting the sample flow.
If flow through the filter is overrestricted, the pressure during the sampling cycles may be
inadequate, creating a Service Status message. Follow the test procedure, cycle valve
tests, and replace the filter if the test indicates a flow restriction.
10.3.2.3. External in-line filters
These filters are located at or near each sample line inlet. Replace filters according to the
recommended schedule or more frequently if required. You do not have to take the ACM
150 monitor off-line when replacing filters because flow is not interrupted.
You can replace all the filters on the same schedule or in phases, e.g., 25% every three
months. Since sample points are often added in phases, you might use the same phase
interval for filter replacement. Locating, accessing, and replacing the in-line filters is time-
consuming.