RKI Instruments GD-70D Series - Manual (Page 41)

4 Detection Mode 4-4. Other functions
- 41 - GD-70D
<Zero Follower Function>
Some types of sensor used with the detector might
have sensitivity variations after being used for a long
period.
This function corrects the variation of the reading at
the zero point (zero drift) among the sensitivity
variations over time by a program manipulation to
stabilize the zero point, and works on the
electrochemical type (ESU) and pyrolysis-particle
type (SSU).
<Sensitivity Correction
Function>
Some types of sensor used with the detector might
have sensitivity variations after being used for a long
period.
This function compensates the degradation of the
gas sensitivity among the sensitivity variations over
time. It works on the electrochemical type (ESU) and
makes the span adjustment by a program
manipulation based on the principled degradation
pattern.
* The zero adjustment is made periodically.
Zero Follower On
Zero Follower Off
* The zero drift of the sensor appears as the reading.
Reading
Zero point
0 Time
↓
Zero point
0
Reading
Time
Sensitivity Correction Off
* The sensor sensitivity becomes degraded.
Sensitivity Correction On
* The span is lifted up periodically.
↓
0 Time
Gas correction
Reading
Gas correction
0
Reading
Time