Calibration - JUMO 202550 Operating Instructions Manual

18.6 Calibration

Preparation for
calibration
Select type of
temperature
acquisition
The cell constants of conductivity cells vary somewhat from one example to
another, and also drift with use (because of deposits and wear). This results in
a change of the output signal from the cell. It is therefore necessary that the
user is able to compensate for the deviations of the cell constant from the
nominal value, either by manual input or an automatic calibration of the relative
cell constant K ,
rel
Chapter 18.7 "Calibrating the relative cell constant", page 53.
The time interval between two calibrations depends on the conditions in which
the cell is used.
The conductivity of a solution varies with the temperature, so for correct
measurement both the temperature and the temperature coefficient of the
solution being measured must be known. The temperature can either be
measured automatically, with a Pt100 or Pt1000 temperature probe, or set
manually by the user. The temperature coefficient can be determined
automatically by the JUMO dTRANS Az 01, or entered manually.
.
Cancel
You can change back to the measurement mode at any time, by
pressing the
Before the first calibration, it is necessary to select the method of temperature
acquisition (automatic or manual) to be used during calibration.
.
If subsequent calibrations are carried out with the same settings,
then it will not be necessary to set the temperature acquisition
again.
The instrument is in the measurement mode.
Unlock the configuration level, if necessary,
"Unlocking the levels", page 27, (code word 0300).
Press the key twice, for more than 2 seconds, to access the
PGM
configuration level.
The lower display shows "C111".
Use the and
Type of temperature acquisition
Manual temperature compensation
Automatic temperature compensation with Pt100
Automatic temperature compensation with Pt1000
Press the key (confirmation)
PGM
Press the key (return to the measurement mode).
EXIT
18 Conductivity indicator
key.
EXIT
keys to set the configuration parameter:
X X X 0
0
1
2
51