Chapter 2. Taking Measurements
Model PM880 Portable Hygrometer User’s Manual 23
2.2 Connecting the Sample System to the Process
To connect the sample system to the process at the measurement site, refer
to Figure 11 and complete the following steps:
1. Crack open the existing pipeline sample tap valve to clean the sample
tap.
2. Close the pipeline sample tap valve.
3. Remove the sample system from its case.
4. Be sure the sample system inlet needle valve is closed and the
filter/coalescer outlet needle valve and sample outlet needle valve are
open.
5. Connect the sample system to the sample tap. We recommend using
1/4” stainless steel tubing. The distance from the sample tap to the
sample system should be a short as possible, typically 5 to 15 feet (1.5
to 4.5 m). A male NPT process connection is provided.
Figure 11: The Sample System and the PM880
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