Commissioning Liquisys M CPM223/253
74 Endress+Hauser
Coding Field Setting range
(Factory settings, bold)
Display Info
C (1)
CALIBRATION
function group
Calibration pH
Only for A1 = pH.
Calibration with two different buffer
solutions.
C11
Enter calibration
temperature
25.0 °C
-50.0 to 150.0 °C
Only for B1 = MTC.
C12
Enter pH value of the
first buffer solution
Buffer value of the last
calibration
pH 0.00 to 14.00
You can edit the displayed value. The
value is given by the corresponding buffer
solution.
Insert the electrode into the buffer indicated. In the case of ATC operation,
the temperature sensor must also be immersed in the buffer solution.
Press CAL for the current measured value to be displayed. Then start the
calibration by pressing CAL again.
In the case of symmetrical measuring
operation, the potential matching pin
must also be immersed in the buffer.
C13
Calibration is
performed
Display flashes
Stability check:
The value is accepted in the event of
stability ±pH 0.05 for more than 10 s.
1. Manual continuation: if the value becomes stable, you can accept the calibration for buffer solution 1 with the CAL key.
2. Automatic continuation: takes place if the value is stable (difference between measured values 0.05 and constant value over 10 s). If the value
does not stabilise within 5 min, error 44 is set and the calibration is aborted.
C14
Enter pH value of the
second buffer
solution
Buffer value of the last
calibration
pH 0.00 to 14.00
The buffer must have another pH value
than buffer 1.
A plausibility check takes place.
Proceed with buffer 2 as with buffer 1.
C15
Calibration is
performed
Display flashes
Accepted in the event of stability ±pH
0.05 for more than 10 s.
C16 Slope is displayed
Usual values
Glass: 59.16 mV/pH
38.00 to 65.00 mV/pH
Antimony: 59.16 mV/pH
25.00 to 65.00 mV/pH
ISFET: 59.16 mV/pH
38.00 to 65.00 mV/pH
Press CAL.
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