
Coding Field
Selection or range
Factory setting (bold)
Display Info
C17
Zero point (U_is)
is displayed
Glass: pH 7.00
pH 5.00 ... 9.00
Antimony: pH 1.00
pH –1.00 ... 3.00
IsFET: present value
–500...+500 mV
The zero point of the IsFET
sensor is displayed in mV.
C18
Calibration status
is displayed
o.k.
E xxx
C19
Store calibration
result
yes
no
new
If C18 = E xxx, then only
no or new.
If new, return to C.
If yes/no, return to
“Measurement”.
The electrode can now be installed into the process again.
C (2)
Function group
CALIBRATION:
Calibration for
redox mV
Calibration
Redox mV
Only if A1 = ORP (mV).
The transmitter has a calibrated mV display range. An
absolute mV value with a single buffer solution is entered
(measuring chain offset adaptation). Use a buffer solution
preferably with 225 or 475 mV.
The maximum calibration offset is
±100 mV.
C21
Enter mV value
corresponding to
the redox buffer
used
Current measured
value
–1500 ... 1500 mV
Connect the potential matching
line with the buffer in case of
symmetrical measuring mode.
C22
Calibration is
performed
mV value
Acceptance when stability is
reached
≤ ±1 mV for more than 10 s.
C23 Zero is displayed –100 ... 100 mV
C24
Calibration status
is displayed
o.k.
E xxx
Factory settings are printed in bold face;
base version does not include functions in
italic.
7.00 C17
Zero
pH
o.k. C18
Status
yes C19
Store
C
CALIBRAT
225 C21
mV Buffer
mV
225 C22
CAL mV
mV
0 C23
Zero
mV
o.k. C24
Status
PM253E5B.CHP
Liquisys M CPM 223 / 253 Instrument configuration
Endress+Hauser 55
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