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ACM 150
Internal gas cell filter
The gas cell filter is part of the mechanical pump assembly,
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 over-restricted, the pressure during the sampling cycles
may be inadequate and create a Service Status message. Follow the test procedure,
Cycle valve
tests, and replace the filter if the test indicates a flow restriction.
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 of the filters on the same schedule, or you can replace them
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. It is time
consuming to locate, access and replace the in-line filters.
If flow through one or more filters is over-restricted, the vacuum on those lines
should increase when they are sampled and create a Service Status message. Follow
the test procedure,
restriction.
NOTE
Avoid unnecessary downtime. Do not wait until a Service Status message is
generated before replacing filters. Replace filters on an established schedule.
You can modify the schedule based on actual experience at your facility.
Visual inspection
You should visually inspect the gas cell filter and in-line filters during each service.
The filter housing is white and semi-transparent when new. If the housing appears
clean and, if testing indicates there is no flow restriction, you can postpone
replacement until the next service.
If the filter appears dark and or deeply discolored, replace it. In-line filters on dirty
and/or corrosive sample points appear this way much sooner than filters on clean
points. Increase the replacement frequency of filters that foul ahead of schedule.
Light discoloring is normal and not a reason to replace the filter before its scheduled
replacement date.
Servicing the pumps
Self-monitoring and manual testing
The ACM 150 monitor constantly monitors its vacuum pumps. If either venturi pump
fails to provide adequate vacuum, the Backup Exhaust Pump turns on automatically
and a Service Status message notifies the user. A message is also generated if the
Boost Pump fails to provide adequate flow, however, there is no backup for the
Boost Pump.
Cycle valve
tests, and replace the filter if the test indicates a flow
Figure
121
12, located in the
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