37
Figure 21. Venturi Supply (Option)
3.4.6. Other sampling components
3.4.6.1.
Filter
A polypropylene filter is installed on the Booster pump failure detection outlet. It helps
keep the gas cell clean by removing particulates down to 0.1 microns.
3.4.6.2.
Gas cell pressure gauge
A gauge mounted onto the top of the 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, Figure 10.
3.4.6.3.
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.
3.4.6.4.
In-line sample filters
Honeywell supplies the initial set of inline filters 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. If particulates are not filtered, the valves can become plugged, and flow can be
restricted.
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