ProMinent DULCOMETER Assembly And Operating Instructions Manual page 52

Operating menus for the measured variables pH and ORP
Valid calibration values
Valid calibration:
Zero point -60 mV...+60 mV
–
Slope 40 mV/pH...65 mV/pH
–
Two test containers with a buffer solution are required for calibration. The pH value of the
buffer solutions should be at least 1.5 pH units apart. Thoroughly rinse the sensor with
water when changing the buffer solution.
1. Select the calibration menu
2.
Start the calibration
3. If temperature has been selected (only if
then set the buffer temperature with the keys
4. Confirm the entry by pressing the
5. Set the pH-value of the buffer
6. Immerse sensor in the buffer solution containing test container 1 (e.g. pH 7). In so
doing, slightly move the sensor
7.
Then press
ð Calibration is running
8.
Then press
ð if CAL=ACCEPT is shown in the display and the displayed mV value is stable.
9. Remove the sensor from the buffer solution, rinse thoroughly in water and then dry
with a cloth (pad dry, don't rub!)
10.
Set the pH-value of the buffer
11. Immerse sensor in the buffer solution containing test container 2 (e.g. pH 4). In so
doing, slightly move the sensor
12. Then press
ð Calibration is running
13. Then press
ð if CAL=ACCEPT is shown in the display and the displayed mV value is stable.
14. The determined values for the zero point and slope are displayed
52
'ZERO' using the keys
.
to accept the value
'SLOPE' using the keys
.
to accept the value
'TEMP' is set to 'auto' or 'manual' ),
, and
key
, and
, and