Chapter 2. Taking Measurements
26 Model PM880 Portable Hygrometer User’s Manual
2.5 Operating the Sample System
Refer to Figure 13 while performing this procedure.
1. Crack open the sample inlet valve allowing a low volume purge of the
sample system.
2. Very slowly open the inlet value allowing it to reach process pressure.
3. Begin closing the filter/coalescer outlet needle valve and the sample
outlet valve until both valves are nearly closed.
4. Adjust the sample outlet needle valve and the filter/coalescer outlet
valve until you feel a slight pressure against your finger at the venting
tubes.
5. Open the inlet valve fully. Be sure the flow out of the venting tubes
remains the same as in step 4. To prevent physical damage, do not
subject the probe to excessive flow.
6. Turn on the PM880.
Figure 13: Sample System Valve Locations
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