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6. Select the line "cal. meas. value" with UP/DOWN.
pH
cal. meas. value
cal result
cal cycle
7. Select one of the defined buffer solutions ("GRUNDFOS",
"DIN/NIST", the optional setting "others"), and press OK.
– The menu "temperature" is then selected automatically.
buffer
GRUNDFOS
DIN/NIST
others
8. Enter the temperature of the buffer solutions.
9. Press OK to automatically jump to the menu "buffer value 1".
10."GRUNDFOS" or "DIN/NIST" buffer solutions: Select one of
the three available buffer values.
buffer value 1
4.01 pH
7.00 pH
9.18 pH
Buffer 1
Once the buffer values have been read by the measuring
amplifier, the temperature of the sample water and the measured
signal are automatically read.
1. Then discard the buffer solution.
– Do not return the buffer solution to the supply bottle!
2. Press OK to automatically jump to the menu "buffer value 2".
Buffer 2
1. Select one of the two other buffer values.
2. Press OK to automatically read the measured signal of buffer
value 2, and compare it with the buffer values.
– The calibration result is then displayed:
sensor gradient + asymmetry potential.
CALDATA pH
slope
- 60.17 mV / pH
asymmetry pot.
19 mV
3. Then discard the buffer solution.
4. Go back to the menu "calibration" with ESC.
Then calibrate the chlorine value!
Calibrating the parameters chlorine, chlorine dioxide and
ozone
•
DIP: Select the left-hand display for chlorine with the Select
button.
1. Select the calibration function with the CAL button. The LED
illuminates.
2. Press OK to select the menu "calibration".
3. Select "chlorine", and confirm with OK.
chlorine
cal. meas. value
cal result
cal cycle
18
4. Enter the reference value (for instance the value measured
photometrically using DIT).
– The measured signal is then read in automatically and
compared with the reference value.
– The calibration result is then displayed: sensor gradient.
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 (on both displays with DIP).
– The data of the last 10 calibrations can be read.
12.8.3 Calibrating the parameters chlorine, chlorine dioxide
or ozone with Conex DIS-D
1. Press the CAL selector, and select the calibration menu.
– The CAL LED next to the CAL selector illuminates.
– To prevent overdosing, the controllers must be switched off,
and the actuators closed.
– When the calibration function has been selected with the
CAL button, the measured-value display shows the current
measured value.
2. Use UP/DOWN to select the photometrically or analytically
determined reference value (for instance the value measured
photometrically using DIT).
3. Start the calibration with OK.
– The sensor data are then read in by an automatic read
function, and the calibration carried out.
– The gradient (sensitivity) of the sensor is calculated.
– The calibration result is displayed immediately after the
calibration.
– The sensor gradient is displayed in µA/ppm.
Calibration result
•
The result of the current (last) calibration can be displayed in
the code menu at any time:
– Code 51: display of calibrated gradient in µA/ppm.
Error message when reading in the current signal of the
sensor system
•
The alarm LED flashes.
•
The code flashes.
*13*: Gradient error.
The alarm is triggered if the plausibility check establishes an
upward or a downward violation of the following gradient ranges
depending on the selected measuring cell:
Measuring cell
Lower limit
AQC-D3
2.5 µA/ppm
•
Press OK to acknowledge the error message and to return to
the display level.
– The calibration data are then imported.
The instrument is operating in emergency mode!
Note
Eliminate the fault, see section 13.5 Fault finding
chart, and calibrate again!
Upper limit
70.0 µA/ppm
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