15
Error message Condition Comment
Calibration Cl not possible! Zero point < 3 mA Repeat calibration in sample water
Zero point too low without chlorine!
Calibration Cl not possible! Zero point > 5 mA Repeat calibration in sample water
Zero point too high without chlorine!
Complete Operating Menu / Description
Calibration of the Chlorine sensor (Zero point and slope)
During the calibration, the D1C sets the controller outputs to “0”. Exception: If a base load or manual
controller output was set, these are maintained during the calibration. The standard signal outputs mA
(measured value or correction value) are frozen. The measured value frozen at the start of calibration is
offered as the DPD value; this value is adjustable (arrow keys!). Calibration is only possible if the DPD value
is ≥2 % of the measurement range. Once calibration has been successfully completed, all fault tracing
procedures which refer to the measured value are restarted.
Zero point calibration must be carried out under real conditions in water free of chlorine dioxide. Calibration
is normally only necessary for the measuring range 0 – 0.5 ppm when measuring at the lower limit of the
measuring range.
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 (see page 17).
D1C2-Cl-018-GB
Permanent display 1
Permanent display 2
only with control
(w = setpoint)
ppm
0.45
mea. val.
fd. fwd.:
reg. val.:
0.45 ppm
w: 1.00 ppm
70 %
59 %
Positive values of control variable:
Negative values of control variable:
Chlorine
Dechlorine
(chlorine destruction)
D1C2-Cl-031-GB
Permanent display 1
zero p.:
value take over?
4.00 mA
calibration Cl
DPD-value:
1.55 ppm
calibration Cl
zero p.:
slope
4.00 mA
6.00 mA/ppm
calibration Cl
1.55 ppm
zero p.:
slope:
4.00 mA
6.00 mA/ppm
calibration Cl
DPD value
calibration Cl
Possible values
Initial value Increment Lower value Upper value Remarks
Measured value 0.01 ppm 0 ppm 100 ppm
BA_DM_173_03_09_GB.p65 30.03.2009, 12:10 Uhr15
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