GE Moisture Image 1 Series, Руководство по программированию

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Advanced Programming 3-15
April 2004
Using Computer
Enhanced Response
Enhanced Response 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 dew point and the number of
channels. For a change from ambient moisture levels to trace levels,
the unit can respond in three to five minutes for single-channel
operation.
The accuracy of enhanced response is ±2°C of the reading the sensor
would have read if it were allowed to reach equilibrium with the gas.
To ensure that computer enhanced software is as accurate as possible,
your application should:
•
have a reasonably constant final dew point 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 at or above a dew/frost point of
•
MIS Probe: -85°C
•
M Series or TF Series Probe: -110°C
To activate and use enhanced response, see Figure 3-18 on page 3-31
for a menu map and complete the following steps.
1. Allow the sensor to reach equilibrium at ambient moisture levels
before being exposed to the dry gas. Exposing the sensor to dew
points of 5 to 10°C for 5 to 10 minutes will enable the sensor to
reach equilibrium.
2. Use Table 3-6 below to activate the computer enhanced response.
3. If necessary, press the PAGE menu key until the Enhanced
Response Menu appears (see Figure 3-9 on page 3-16).
Table 3-6: Activating the Enhanced Response Option
Press the Main Menu key: To enter the:
OPTIONS Option Menu
USER User Constant Menu