5.8
Interfaces
5.9
Calibration
This function group is used to calibrate the
transmitter. Two types of calibration are
possible:
• Calibration by means of measurement
in two calibration solutions with a known
pH value.
• For redox measurement by entering the
mV value or two different % values.
Note:
•
If the calibration procedure is
aborted by pressing the PLUS and
MINUS keys at the same time
(return to C19, C25 or C36) or if
the calibration is faulty, then the
previous calibration data are
reinstated. A calibration error is
indicated by the “ERR” message
and flashing of the electrode
symbol on the display. Repeat
calibration!
•
The instrument is automatically
switched to hold during calibration
(factory setting).
•
An offset entered by the user is
automatically cancelled when the
calibration is accepted.
Slope and zero ranges for electrodes
Glass electrodes:
65.00 mV/pH > slope > 38.00 mV/pH
pH 9.00 > zero > pH 5.00
Antimony electrodes:
65.00 mV/pH > slope > 25.00 mV/pH
pH 3.00 > zero > pH –1.00
Note:
If the slope or zero is outside
these ranges, error 32 is activated
for slope or error 33 for zero. The
electrode should then be checked
and replaced if necessary.
Coding
Field
Selection or range
Factory setting
Display
Info
I
Function group
INTERFACE
I1
Enter address
Address
HART:
0
... 15
or
PROFIBUS: 1 ...
126
For communication only.
Factory settings are printed in
bold
face;
base version does not include functions in
italics.
I
INTERFACE
126
I1
Address
PM253E5B.CHP
Liquisys M CPM 223 / 253
Instrument configuration
Hauser
47
