Riken Keiki GD-84D-EX Series, Руководство по эксплуатации

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6. Alarm Activation 6-4 Various functions to ensure proper alarm activation
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6-4-2 Zero follower function
Depending on sensor specifications, the sensors used in the product may suffer sensitivity degradation
when used for extended periods.
The zero follower function is programmed processing designed to stabilize the zero point by correcting
fluctuations in readings (zero drift) caused by the sensitivity variation over time of the zero point.
NOTE
 The zero follower function is available for the new ceramic sensors and sensors based on the
electrochemical detection principle.
 The 24-hour zero follower function performs zero following only for the first 24 hours after the power
is turned on.
<Zero follower function OFF> <Zero follower function ON>
6-4-3 Sensitivity correction function
Depending on type, the electrochemical type sensor used in the product may suffer sensitivity degradation
when used for extended periods. The sensitivity correction function is designed to compensate for (assist)
gas sensitivity degradation accounting for variations in sensitivity over time. Span adjustment is performed
according to programmed processing based on theoretically derived degradation trends.
NOTE
 The sensitivity correction function is available for sensors based on the electrochemical type
detection principle.
<Sensitivity correction function OFF> <Sensitivity correction function ON>
CAUTION

The sensitivity correction function is a support function. Fixed span adjustment is performed based
on theoretically derived degradation trends. Span adjustment is not performed based on the
individual sensitivity variations of each sensor.

Corrections of individual sensors’ sensitivity variations must be performed as periodic span
adjustment using a calibration gas.
Zero
point
0
Reading
Time
Zero
point
0
Reading
Time
Sensor zero drift appears in readings. Zeroing is performed periodically.
Sensor sensitivity degrades.
Span adjustment is performed periodically.
Calibration
0
Reading
Time
Calibration
0
Reading
Time