Calibration Example Based On Chlorine Measurement With Ph Compensation (Not With Conex Dis-D) - Grundfos AQC-D13 Instrucciones De Instalación Y Funcionamiento

10.8.2 Calibration example based on chlorine measurement
with pH compensation (not with Conex DIS-D)
Observe the installation and operating instructions of
Caution
the measuring amplifier and controller!
• Define the basic settings for the measuring amplifier.
When carrying out a chlorine measurement with pH
compensation, the pH value must be calibrated first,
Note
since the pH value is used when calibrating the
chlorine value!
Calibrating the pH value
• DIP: Push the button underneath the right-hand display.
• Conex DIA and DIP: Use the [CAL] button to select the
calibration function CAL. The LED illuminates.
1. If necessary, enter the code number for CAL (or full)
authorisation.
2. Change to the menu "calibration" with the [OK] button.
3. Select the measured variable "pH", and confirm with [OK].
– Selection possibilities: "cal. meas. value" (= measured
value), "cal. result" and "cal. cycle" (= count-down function
which triggers the alarm "calibrate sensor" after a selectable
time interval of 1-100 days).
4. Select the line "cal. meas. value" with [UP]/[DOWN].
pH
cal. meas. value
cal. result
cal. cycle
5. Select one of the defined buffer solutions ("GRUNDFOS",
"DIN/NIST", "others"), and press [OK].
– The menu "temperature" is selected automatically.
buffer
GRUNDFOS
DIN/NIST
others
6. Enter the temperature of the buffer solutions.
7. Press [OK] to jump to the menu "buffer value 1".
8. "GRUNDFOS" or "DIN/NIST" buffer solutions: Select one of
the available buffer values.
buffer value 1
4.01 pH
7.00 pH
9.18 pH
16
Buffer 1
1. Fill buffer solution 1 from the supply bottle into a clean vessel.
2. Remove the electrode from the measuring cell, and immerse
in the buffer solution.
3. Press [OK] to read in the temperature of the sample water and
the measured signal.
4. Discard buffer solution 1.
– Do not return the used buffer solution to the supply bottle!
5. Flush electrode with water.
6. Press [OK] to jump to the menu "buffer value 2".
Buffer 2
1. Select buffer value 2.
2. Fill buffer solution 2 into a clean vessel.
3. Immerse the electrode.
4. The measured signal is read in and compared with the buffer
values.
– The calibration result (sensor slope and asymmetry
potential) is displayed.
CALDATA pH
slope
- 60.17 mV/pH
asym.pot
19 mV
5. Discard buffer solution 2.
6. Flush the electrode with water, and return to the measuring
cell.
7. Go back to the menu "calibration" with [ESC].
Then calibrate the chlorine value.
Calibrating the chlorine value
• DIP: Push the button underneath the left-hand display.
• Conex DIA and DIP: Select the calibration function with the
[CAL] button. The LED illuminates.
1. Press [OK] to select the menu "calibration".
2. Select "chlorine", and confirm with [OK].
3. Select "cal. meas. value".
chlorine
cal. meas. value
cal. result
cal. cycle
4. Enter the reference value.
– The measured signal is read in automatically and compared
with the reference value.
– The calibration result (sensor slope) is displayed.
CALDATA chlorine
slope
34.67 µA/ppm
Reading calibration data in the diagnostics menu "service"
Select "service" in the "main menu" with [UP]/[DOWN], and
•
press [OK] (DIP: on both displays).
– The data of the last 10 calibrations can be read.