Grundfos Conex DIA-2, Installation And Operating Instructions Manual

Page: 49 / 612

English (GB)
49
11.9.3 Calibration of the parameters chlorine, chlorine dioxide, peroxide and ozone
Fig. 37 Calibration of the parameters chlorine, chlorine dioxide, peroxide and ozone
Having switched to the calibration function by
pressing [Cal], the display is in the mode "measured
value" and indicates the current measured value.
1. Press [OK] to switch to the calibration menu (the
first line reads "chlorine", for instance").
2. Select the line "cal. meas. value", and press [OK]
to switch to the corresponding menu.
• In the bottom line, the entry field (value in mg/l) for
the reference value (determined photometrically or
analytically) and the present cell current or
electrode current (in µA) are displayed.
3. Enter a reference value (for example determined
photometrically with the Grundfos DIT photometer).
4. Press [OK] to start calibration.
– An automatic reading function reads in the
sensor data, and the calibration is carried out.
– The slope (sensitivity) of the sensor is calculated.
• Immediately after calibration, the result of the
calibration is indicated automatically (first line:
"cal. meas. value"):
– The slope of the sensor in µA/ppm is displayed.
TM
03
67
19
45
06
slope
0-100 days
on
cal. cycle
cal result
cal. meas.
value reference
value
"Cal"
chlorine,
chlorine dioxide,
peroxide,
ozone
automatic reading of the
cell signal and calibration
cal result:
slope
chlorine
cal. meas. value
cal result
cal. cycle
cal. meas. value
0.45 mg/l
I-cell 10.4 µA
CALDATA chlorine
slope
34.67 µA / ppm