ProMinent DULCOMETER D1C Operating Instructions Manual page 16

Complete Operating Menu / Description
Error message
Calibration Cl not possible!
Slope low
Calibration Cl not possible!
Slope high
DPD value too low
DPD > x.xx ppm
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
zero p.: 0.0 mV
slope 25°C
59.16 mV/pH
Buffer values
16
Condition
Slope Cl too low
(<25 % of norm slope)
Slope Cl too high
(>300 % of norm slope)
DPD <2 % measuring range
calibration pH
probe in buffer
1 !
7.00 pH 33.0°C
calibration pH
probe in buffer
2 !
4.00 pH
33.0°C
calibration pH
zero p.: 0.00 mV
slope 25°C
59.07 mV/pH
Permanent display 1
Possible values
Initial value Increment
Rounded off pH 0.01
whole number
measured value
Effect
Calibrate again!
Calibrate again!
Calibrate again after adding chlorine
calibration pH
calib. 1 active
please wait !
6.96 pH 33.0°C
calibration pH
calib. 2 active
please wait !
4.00 pH
33.0°C
Lower value Upper value
pH -2 pH 16
calibration pH
buffer1: 7.00 pH
buffer2:
temp.: 33.0°C
calibration pH
buffer1: 7.00 pH
4.00 pH
buffer2:
temp.: 33.0°C
= automatic timing
D1C2-Cl-032-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.