Liquisys M CPM223/253 Commissioning
Endress+Hauser 75
C17
Zero point (zero
point / U_is) is
displayed
Usual values
Glass: pH 7.00
pH 5.00 to 9.00
Antimony: pH 1.00
pH -1.00 to 3.00
ISFET: current value
-500 to +500 mV
For ISFET, the zero point is displayed in
mV.
Press CAL.
C18
Calibration status is
displayed
Display:
o.k. or error code
Press CAL.
C19
Store calibration
result?
yes
no
New
If C18 = E xx, then only No or New.
If New, return to C.
If Yes/No, return to "Measurement".
The electrode can now be reinstalled in the process.
C (2)
CALIBRATION
function group:
Calibration for ORP
mV
Calibration ORP mV Only for A1 = ORP (mV).
The measuring transmitter has a calibrated mV display range. An
absolute mV value with a single buffer solution (adjustment of measuring
chain offset) is set. Here, a buffer solution is used, preferably with 225 or
475 mV.
The maximum permitted calibration
offset is ±100 mV.
C21
Enter the mV value
belonging to the ORP
buffer used
Current measured value
1500 to 1500 mV
In the case of symmetrical measuring
operation, the potential matching pin
must also be immersed in the buffer.
C22
Calibration is
performed
Display flashes
mV value
Stability check:
The value is accepted in the event of
stability ±1 mV for more than 10 s.
C23
Zero point is
displayed
-100 to 100 mV
C24
Calibration status is
displayed
Display:
o.k. or error code
Press CAL.
Coding Field Setting range
(Factory settings, bold)
Display Info
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