Calibrating The Ph Sensor - ProMinent DULCOMETER D1C Operating Instructions Manual

Restricted Operating Menu / Description
Calibrating the pH sensor (only possible with correcting variable pH)
The pH sensor is calibrated with the aid of two-point calibration (zero point/slope). Buffer self-detection at
pH 7 (zero point calibration) and at pH 4 (calibration of slope). The measured pH value of the buffer is
proposed as the buffer value and can be changed manually (arrow keys). The control is stopped during
calibration and reduced to the set basic load. The measured value is frozen. The errors relating to the
corresponding measured variable are reset after successful calibration. The current data of the pH sensor
(zero point and slope) are displayed.
calibration pH
0.0 mV
zero p.:
slope 25°C
59.16 mV/pH
Initial value
Buffer values Rounded-off
whole number
measured value
IMPORTANT
pH correction is not possible if there are oxidating substances in the sample water! When
a CLE measuring sensor is used:
- The temperature must be between 10 °C and 15 °C
- The pH value must be between 5 and 8
- The corrective sensor current is limited to 25 mA
10
calibration pH
probe in buffer
1 !
12.00 pH
calibration pH
probe in buffer
2 !
4.00 pH
calibration pH
0.0 mV
zero p.:
slope 25°C
59.16 mV/pH
Permanent display 1
Possible values
Increment
pH 0.01
calibration pH
calib. 1 active
please wait !
33.0°C
12.00 pH
calibration pH
calib. 2 active
please wait !
33.0°C
4.00 pH
Lower value Upper value
pH -2 pH 16
calibration pH
buffer1: 12.30 pH
buffer2:
temp.: 33.0°C
calibration pH
buffer1: 12.30 pH
buffer2: 4.00 pH
temp.: 33.0°C
= automatic timing
D1C2-Cl-019-GB
Remarks
Error messages
when both buffers too
close (<2 pH values).
In order to operate perfectly,
the pH sensor must be checked
and calibrated regularly (weekly),
since deviations of ±0.1 pH may
cause errors of measurement.
Further more, when using a CLE
sensor, a slope calibration adjustment
of the chlorine sensor should always
be done after a pH calibration.