Chapter 4. Using Special Features
Model PM880 Portable Hygrometer User’s Manual 69
4.9.1 Response Time Procedure (cont.)
The PM880 will display the actual dewpoint temperature during the initial
dry-down. The display will indicate a bold “E” in the system tray which
means the PM880 is in CER mode. After 2 to 5 minutes, the PM880 will
perform its initial predicted calculation of the equilibrium dewpoint
temperature. When the prediction is made, the display will indicate an “E”
in inverse text (ie. dark background) in the system tray.
6. Continue to monitor the readings, as the PM880 will continue to update
its prediction and record the reading once stabilized.
Note: If the dewpoint temperature increases to a wetter value during the
dry down, the PM880 may not report a prediction and the bold “E”
will remain on the display. This indicates an unstable moisture
content in the gas. Verify that the system is leak tight and repeat this
process.
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