Pr
o
Minent
®
Page 96
Total Chlorine
Slope
Test
Insert the sensor into the DLG III or DGM in-line probe housing, if not already done (see
Assembly).
Take a water sample for DPD-measurement. Sampling location has to be close to the installed
sensor. Recommendation: use the sampling tap in the case of the DGM in-line probe housing.
Determine total chlorine content with an appropriate chlorine measurement kit according to
the DPD-4 method (e.g. Photometer DT1, order no. 1003473).
Input the measured value into the controller according to it‘s operating manual
Operating Instructions: DULCOMETER
®
D1C, chlorine Chapter 8, complete operating menu,
settings menu “Calibrating chlorine”
After initial installation of the sensor, check the calibration by DPD-measurement 24 hours later.
The following maintenance intervals based on experiences are recommended.
•
Potable, industrial, process and cooling water depending on the specifi c conditions (1-4 weeks)
• swimming pools: weekly
• spa pools (whirlpools): daily
Calibration of the Chlorine Sensor
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 registe-
red 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 correspond to the adjusted measuring range
(factory setting: 0–2 ppm). A change of the measuring range must be done before cali bra-
tion!
D1C2-Cl-011-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: Chlorine
Negative values of control variable: Dechlorine
(chlorine
destruction)
D1C2-Cl-012-GB
calibration Cl
calibration Cl
DPD-value:
0.45 ppm
zero p.:
slope:
4.00 mA
6.50 mA/ppm
calibration Cl
zero p.:
slope:
4.00 mA
6.75 mA/ppm
Permanent display 1
Possible
values
Initial value
Increment
Lower value
Upper value
Remarks
Measured value 0.01 ppm
0 ppm
100 ppm
Error message
Condition
Remarks
Calibration Cl not possible!
Cl slope too low
Calibrate again
Sensor slope too low
(<25 % of norm slope)
Calibration Cl not possible!
Cl slope too high
Calibrate again
Sensor slope too high
(>300 % of norm slope)
DPD value too low!
DPD <2 % of measuring
Calibrate again after adding
DPD > x.xx ppm
range
chorine
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24.02.2009 11:56:09 Uhr
