Grundfos Oxiperm Pro OCD-162-10, Инструкция по установке и эксплуатации

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5.13 Calibration
Fig. 16
CALIBRATION menu structure
For information about calibration, please also refer to the
installation and operating instructions for the
Oxiperm Pro
measuring cell (AquaCell AQC-D1).
5.13.1 Perform ClO
2
calibration
To calibrate the ClO
2
measured value, a reference measurement
must be taken first, for example photometrically (with Grundfos
Alldos DIT photometer and the usual ClO
2
reagents).
The reference value that was determined is then entered in the
operating software by correcting the current measured value in
the measured value display.
The control system reads in the new measured value and assigns
the incoming current signal (µA) from calibration at the measuring
cell current input to the new measured value.
Check whether the electrode measured value is constant:
1. SERVICE > MEASUREMENT > ClO
2
> MEASURED VALUE.
• Current ClO
2
concentration at the measuring cell
• Current signal of the measuring cell
• Measuring range.
If the measured value remains constant, proceed as follows:
2. Determine and note down the ClO
2
value by means of a
reference measurement.
3. Press [Cal].
4. CHLORINE DIOXIDE > [OK].
5. CAL. MEAS. VALUE > [OK].
6. Use the [Up] or [Down] button to set the mg/l value to the
reference value that was determined > [OK].
The control system assigns the reference value to the current
signal.
The result is represented geometrically:
When the current (in µA) is entered on the y axis and the ClO
2
concentration (in mg/l) on the x axis, the result is a point. The
second point is the 0 point, as no current flows from the electrode
when there is no ClO
2
in the water. Joining the two points results
in a straight line.
7. CAL. RESULT > [OK].
The result is displayed as a slope of the straight line in µA per
ppm (ppm = parts per million = mg/l in water).
From now on the control system uses this value as the basis for
calculations.
The ClO
2
calibration has been completed.
TM
03
69
41
45
06
CALIBRATION
CAL. CYCLE
pH
ON OFF ON OFF
SLOPE
µA / mg/l
CAL. MEAS.
VALUE
CAL RESULT
GRUNDFOS
DIN/NIST
OTHER
SLOPE
µA / mg/l
ASYM. mV
ASYM. mV
REDOX ClO
2
ON OFF
CAL. CYCLE
CAL. MEAS.
VALUE
CAL RESULT
CAL. CYCLE
CAL. MEAS.
VALUE
CAL RESULT
Note
Only perform calibration with constant measured
values from the measuring cell.
Prior to calibration, check the electrode
measured value of the measuring cell (MAIN
MENU > SERVICE > MEASUREMENT > ClO
2
>
MEASURED VALUE).
ClO
2
MEASUREMENT
0.21 mg/l
5.800 µA
0.0 - 0.5 mg/l
CALIBRATION
CHLORINE DIOXIDE
pH/REDOX
CHLORINE DIOXIDE
CAL. MEAS. VALUE
CAL. RESULT
CAL. CYCLE
CAL. MEAS. VALUE
0.05 mg/l
I CELL 5.2 µA
CAL. RESULT
SLOPE
22.0 µA/ppm