Grundfos Oxiperm Pro OCD-162 - Operation

English (GB)
42
8. Operation
This section includes information on starting, stopping and
monitoring the production and dosing of ClO
2
.
Calibration of the measurement, changing the chemical
containers and manual deaeration of the pump are also
described.
8.1 Production
8.1.1 Starting the production
"main menu > operation > production > start"
8.1.2 Terminating the production
"main menu > operation > production > terminate"
8.2 Dosing
8.2.1 Starting ClO
2
dosing
"main menu > operation > ClO2 dosing > start"
8.2.2 Stopping ClO
2
dosing
"main menu > operation > ClO2 dosing > stop"
8.3 Calibration
To enter the calibration menu press the [Cal] button on the control
unit, see section 7.1 Control elements.
8.3.1 ClO
2
value
1. If the measured value remains constant, determine the ClO
2
value by means of a reference measurement
2. Take a note of this value.
3. Press [Cal] > "ClO2 > cal. meas. value".
4. Set the reference value in mg/l.
ClO
2
calibration is finished and the result is displayed.
8.3.2 pH value
Two different buffer solutions must be used to calibrate the
measured pH value.
1. Prepare two glass jars with the buffer solutions, e.g. buffer 1 =
4.01 pH and buffer 2 = 9.18 pH
2. Prepare an empty 10-litre plastic bucket.
3. Measure the temperature of the buffer solution.
4. Press [Cal] > "pH > cal. meas. value".
5. Select one of the buffer types.
6. Select "Grundfos", for example.
7. Enter the measured temperature of the buffer solution.
8. Shut off the water supply of the measuring cell.
9. Remove the pH electrode from the measuring cell. Use the
bucket to catch any water that flows out.
10. Immerse the pH electrode in the first glass jar.
11. Select the value of the first buffer solution. The voltage is
measured and displayed. Wait until the waiting message
disappears.
12. Remove the pH electrode from the first buffer solution. Rinse
the pH electrode with water.
13. Immerse the pH electrode in the second glass jar.
14. Select the value of the second buffer solution. The voltage is
measured and displayed. Wait until the waiting message
disappears.
15. Remove the pH electrode from the second buffer solution.
Rinse the pH electrode with water.
The pH calibration is finished and the result is displayed.
Finishing pH calibration
1. Put the pH electrode back into the measuring cell.
2. Open the water supply of the measuring cell.
3. Dispose of the buffer solutions.
Note
After a power failure the production restarts
automatically.
Note
The chemical reaction in the reaction tank continues.
The ClO
2
dosing pump continues running, until the
internal batch tank is empty.
ClO2 dosing
start
stop
Note
Constant values of the measuring water are required
for calibrating the measuring cell.
The values are viewed in "main menu > monitoring >
measurement".
cal. meas. value
0.05 mg/l
5.2 µA
cal. result
slope
22.0 µA/ppm
asym.
0.0 µA
cal. meas. value
Grundfos
DIN/NIST
others
Buffer type Buffer values
Grundfos 4.01, 7.00, 9.18
DIN/NIST 4.01, 6.86, 9.18
others
The lower and upper buffer values can be
freely adjusted within the set pH measuring
range (difference of at least 1 pH).
buffer temp.
25 °C
buffer 1
4.01 pH
7.00 pH
9.18 pH
buffer 2
4.01 pH
7.00 pH
9.18 pH
cal. result
slope
-57.88 mV/pH
asym.
-0.6 mV