Pr
o
Minent
®
Page 62
Calibration of the Chlorine Dioxide Sensor
During the calibration the DULCOMETER
®
D1C switches the control outputs to “0”. Exception:
where a basic load or a manual control variable has been entered it is retained throughout the
calibration. The standard mA signal outputs (measured value or correction value) are frozen. The
measured value registered during the start of the calibration is proposed as the DPD value; this
value is adjustable (arrow keys!).
Calibration is only possible if the DPD value is
≥
2 % of the measuring range. On successful
completion of calibration, all error checks which refer to the measured value are restarted.
IMPORTANT
The measuring range of the sensor must agree with the set measuring range (factory
setting: 0–2 ppm). The measuring range must be reset prior to calibration!
Possible
values
Initial value
Increment
Lower value
Upper value
Remarks
Measured value 0.01 ppm
0 ppm
20 ppm
Error message
Condition
Remarks
Calibration ClO
2
not possible!
ClO
2
slope too low
Calibrate again
Sensor slope too low
(<25 % of standard slope)
Calibration ClO
2
not possible!
ClO
2
slope too high
Calibrate again
Sensor slope too high
(>300 % of standard slope)
DPD value too low
DPD <2 % of measuring
Calibrate again after adding
DPD > x.xx ppm
range
chorine dioxide
calibration ClO
2
zero p.: 4.00 mA
slope:
6.50 mA/ppm
calibration ClO
2
DPD-value:
0.60 ppm
temp.: 30.0
°
C
calibration ClO
2
zero p.: 4.00 mA
slope:
6.75 mA/ppm
Permanent Display 1
D1C2-CIO2-012-GB
Chlorine Dioxide Sensor CDP
Positive values of setting variable: chlorine dioxide
Negative values of setting variable: De-ClO
2
(chlorine dioxide
destruction)
auto.: 30.0
°
C
Permanent display 1
Permanent display 2
only with control
(w = setpoint)
ppm
0.60
mea. val. 0.60 ppm
feed fwd: 70 %
ctrl out: 59 %
w: 0.60 ppm
D1C2-CIO2-011-GB
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24.02.2009 11:56:07 Uhr
24.02.2009 11:56:07 Uhr