Using Computer Enhanced Response - GE PM880 User Manual

Chapter 4. Using Special Features

4.9 Using Computer Enhanced Response

Computer Enhanced Response (CER) uses a dynamic moisture calibration
technique to extrapolate the moisture level to the end point when making
measurements in abrupt "dry down" conditions. The system response time
depends on the relative change in dewpoint. For a change from ambient
moisture levels to trace levels, the unit can respond in 3 to 5 minutes.
The accuracy of enhanced response is ±2
have read if it were allowed to reach equilibrium with the gas. To ensure
that CER is as accurate as possible, your application should:
•
have a reasonably constant final dewpoint and flow rate.
•
have a minimum flow rate of one standard cubic foot per hour
(SCFH).
•
operate at atmospheric pressure (0 psig).
•
have an actual moisture content equal to or wetter than a dew/frost
point of
•
MIS Probe: –85
•
M Series and TF Series Probe: –110
Use the steps below to activate computer enhanced response:
4.9.0a Accessing the Response Command
If the menu is not active, press
1.
Use the arrow key to scroll to Program and press
2.
Use the arrow key to scroll to System and press
3.
similar to Figure 29 on page 67 appears.
66
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[MENU]
Model PM880 Portable Hygrometer User's Manual
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[ENTER]
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