10
D1C2-Cl-019-GB
= automatic timing
Permanent display 1
33.0°C 33.0°C
calibration pH
zero p.:
slope 25°C
0.0 mV
59.16 mV/pH
calibration pH
probe in buffer
1 !
12.00 pH
calibration pH
calib. 1 active
please wait !
12.00 pH
calibration pH
buffer1:
buffer2:
temp.:
12.30 pH
33.0°C 33.0°C
calibration pH
probe in buffer
2 !
4.00 pH
calibration pH
calib. 2 active
please wait !
4.00 pH
calibration pH
buffer1:
buffer2:
temp.:
12.30 pH
calibration pH
zero p.:
slope 25°C
0.0 mV
59.16 mV/pH
4.00 pH
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.
Restricted Operating Menu / Description
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
Possible values
Initial value Increment Lower value Upper value Remarks
Buffer values Rounded-off pH 0.01 pH -2 pH 16 Error messages
whole number when both buffers too
measured value 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.
BA_DM_173_03_09_GB.p65 30.03.2009, 12:10 Uhr10
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