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ACM 150
Other sampling components
Filter
A polypropylene filter is installed on the outlet of the Boost Pump. It helps keep the
gas cell clean by removing partiulcates down to 0.1 microns.
Gas cell pressure gauge
A gauge mounted onto the top of gas cell indicates vacuum to positive pressure,
calibrated in inches of Hg (mercury). This gauge can confirm the Sample Pressure
scale on the Cycle Valve Control Panel,
Absolute pressure transducers
The pressure scales on the Sample Valve and Cycle Valve Control Panels are the
outputs of absolute pressure transducers. They measure both sample and bypass
pressures. The computer uses these readings for multiple purposes:
•
Identify a plugged sample line or an internal flow restriction
•
Determine when the Backup Exhaust Pump is needed
•
Optional Line Leak Test pass or fail
In-line sample filters
HA supplies the initial set of inline filters, one for each sample port on the ACM
150 monitor (from 10 to 40). The filters are installed near the sample inlet. They
prevent a build-up of particulates in the tubes and protect the flow control orifices
in the Sample Valves. The valves can become plugged and flow can be restricted if
particulates are not filtered.
NOTE
An inline filter must be installed on every uncapped sample port to protect it,
even if the filter is locally mounted at the inlet tie point on top of the ACM 150
monitor. Checking and replacing filters is required during periodic service.
Figure
7.
38
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