ProMinent DULCOMETER Assembly And Operating Instructions Manual page 56

Operating menus for the measured variables pH and ORP
Single point zero point calibration
CAL
Fig. 26: Single point zero point calibration
Valid calibration values
Valid calibration:
Zero point -60 mV...+60 mV
–
One test container with a buffer solution is required for calibration. Again with the single
point calibration the buffer values for
apart. If these buffer values are not recognised, then you must carry out a 2-point calibra‐
tion.
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
56
pH
OPERATION
6.20 7.20
0%
LIMIT ↓
25.0 °C
CAL
pH
ZERO -3.37mV OK
SLOPE 56,67 mV/pH OK
CAL=ACCEPT
CAL
CAL
pH 4.00
SENSOR = 167 mV
CAL=SKIP SLOPE
'ZERO' and 'SLOPE' must be at least 1.5 pH units
CAL pH
ZERO 0.00 mV OK
SLOPE 59.16 mV/pH OK
CAL=START
CAL pH
BUFFER
TEMP= 025.0 °C
CAL
pH 7
7.00 pH
CAL=START
CAL
pH 7.00
SENSOR = 3 mV
WAIT...
CAL
pH 4/9
04.00 pH
CAL=START
'TEMP' is set to 'auto' or 'manual' ),
, and
Zero
(6,00...8,00 pH)
A0355