Preparation - JUMO 202550 Operating Instructions Manual

1-point
calibration
2-point
calibration
Manual
entry
Temperature

10.3 Preparation

Preparation for
calibration
Select type of
temperature
acquisition
In 1-point calibration, only the electrode zero is freshly determined using a
buffer solution (solution with a known pH value).
Problems arising from an incorrect electrode slope will not be detected by the
user!
This method should only be adopted in cases where the electrode is not
subject to significant chemical and mechanical influences.
2-point calibration makes a fresh determination of the electrode zero and
slope using two buffer solutions.
This method should be given preference!
In addition to the calibration procedure described above, the indicator/
controller offers the facility of manually entering the zero point and slope (as
determined by a laboratory, for example).
The measurement of the pH value depends on temperature; the temperature
of the solution to be measured must therefore be known for calibration. The
temperature can either be measured automatically, with a Pt100 or Pt1000
temperature probe, or set manually by the user.
Cancel
You can change back to the measurement mode at any time, by
pressing the
Before the first calibration, the following has to be determined:
- the type of temperature acquisition during calibration
- the calibration procedure (1-point or 2-point calibration)
- process value output is frozen or not during calibration
.
If subsequent calibrations are carried out with the same settings,
the parameters mentioned above will not have to be reconfigured.
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
key.
EXIT
keys to set the configuration parameter:
10 pH indicator
X X X 0
0
1
2
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