Calibrating The Chlorine Dioxide Measured Value; Performing (Two-Point) Ph Calibration - Grundfos Oxiperm Pro OCD-162 Instrucciones De Instalación Y Programación

9.13.1 Calibrating the chlorine dioxide measured value

To calibrate the chlorine dioxide measured value, a reference
measurement must be taken. This can be made with the
Grundfos DIT photometer and the usual reagents.
The determined reference value is entered by correcting the
current measured value in the display.
The controller reads in the new measured value. It assigns the
current signal [µA] from calibration, coming in at the current input
of the measuring cell, to the new measured value.
Check, if the measured value of the electrode is constant:
1. "service > measurement > ClO2 > measured value".
– Current chlorine dioxide concentration at the measuring cell
– Current signal of the measuring cell
– Measuring range.
measurement ClO2
0.21 mg/l
5.800 µA
0.0 - 0.5 mg/l
If the measured value remains constant:
2. Determine the chlorine dioxide value by means of a reference
measurement, and note it down.
3. Press [Cal].
calibration
chlorine dioxide
pH/ORP
4. "chlorine dioxide" > [OK].
chlorine dioxide
CAL meas. value
CAL result
CAL cycle
5. "CAL meas. value" > [OK].
CAL meas. value
0.05 mg/l
I-cell: 5.2 µA
6. Set the determined reference value in mg/l with [Up] or [Down],
confirm with [OK]. The controller assigns the reference value
to the current signal.
7. "CAL cycle" > [OK].
CAL cycle
slope: 195
22.0 µA/ppm
asym.
The slope is the straight line between the measured value and
the zero point. The unit is µA per ppm (ppm = parts per million =
mg/l in water).
The slope can be presented graphically:
μA
5,2
Fig. 19 Reference value measured with e.g. the DIT
photometer
From now on, the controller uses this value as the basis for
calculations. Chlorine dioxide calibration is completed.
Reading the slope in the calibration logbook
1. "service > measurement".
2. Entry number 1 is the latest entry, entry number 2 is the
previous one, etc.
CalData-LogBook
number...............................1
date....................2007-07-31
time.............................12:34
slope:...................... 22.0 µA
Enabling the display the chlorine dioxide calibration interval
1. "calibration > ClO2 > CAL cycle".
2. Select "Off" to disable the interval or select "On" to enable it.
3. If the interval is enabled enter it in days (1-100).

9.13.2 Performing (two-point) pH calibration

The electrode sends the voltage [mV] that corresponds to the pH
value to the controller. Two different buffer solutions can be used
to calibrate the pH measured value.
1. Prepare two glass jars with the buffer solutions.
2. Prepare an empty 10-liter plastic bucket.
3. Measure the temperature of the buffer solution.
4. Press [Cal].
calibration
chlorine dioxide
pH/ORP
5. pH > [OK].
pH
CAL meas. value
CAL result
CAL cycle
6. "CAL meas. value" > [OK].
CAL meas. value
GRUNDFOS
DIN/NIST
others
mg/l
0,05
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