Pr
o
Minent
®
Page 77
Possible
values
Initial value
Increment
Lower value
Upper value
Remarks
Calibration
Measured
0.1 °C
0 °C
100 °C
temperature temperature
value
Buffer values Rounded-off
0.01 pH
-2 pH
16 pH
Error messages
whole
number
when
both
measured
buffers
too
close
value
(<2
pH-values)
D1C2-012-GB
Temperature setting and specification only with correction value
calibration pH
zero p.:
slope 25
°
C
0.0 mV
59.16 mV/pH
calibration pH
zero p.:
slope 25
°
C
-2.1 mV
59.07 mV/pH
calibration pH
probe in buffer
1 !
7.56 pH
33.0
°
C
calibration pH
calibr. 1 active
please wait !
6.96 pH
33.0
°
C
calibration pH
buffer1:
buffer2:
temp.:
33.0
°
C
calibration pH
calibr. 2 active
please wait !
3.97 pH
33.0
°
C
7.00 pH
calibration pH
buffer1:
buffer2:
temp.:
33.0
°
C
7.00 pH
4.00 pH
calibration pH
probe in buffer
2 !
4.12 pH
33.0
°
C
= automatic timing
Permanent display 1
pH
Calibration of the pH Sensor
During calibration the DULCOMETER
®
D1C sets the adjustment outputs to “0”. Exception: if a
basic load or manual variable has been set, these are maintained during calibration. The output
signals mA (measured value or adjustment value) are frozen.
The recommended buffer value is the measured value rounded-off to the nearest whole number
or the last recorded buffer value. Buffer values are adjustable (arrow keys!).
With successful calibration, all fault fi nding relating to the measured values is re-started. The
DULCOMETER
®
D1C stores the data established for zero point and slope.
Error message
Condition
Remarks
Buffer distance
During calibration procedure:
too small
Δ
Buffer <2 pH
Recalibrate buffer 2!
Return to permanent display:
pH zero point low
< -60 mV
Basic metering load
Warning, old zero
point and slope
retained
pH zero point high
> +60 mV
„
„
pH slope low
< 40 mV/pH
„
„
pH slop high
> 65 mV/pH
„
„
Measured value pH
unsteady
„
Measured value °C
unsteady
„
BA_DR_002_02_09_GB_Cooling.indd 77
BA_DR_002_02_09_GB_Cooling.indd 77
24.02.2009 11:56:08 Uhr
24.02.2009 11:56:08 Uhr
