JUMO 202550 Operating Instructions Manual page 34

10 pH indicator
Calibration
32
Press the + (Cal) keys
PGM
The lower display shows "°C".
If the decimal point flashes, manual temperature acquisition is configured.
Immerse the pH electrode and, if needed, the Pt100 or Pt1000 temperature
probe in the first buffer solution (pH 7).
With manual temperature acquisition, set the temperature of the buffer
solution using the
If the decimal point does not flash, then automatic temperature acquisition
is configured
Wait until the temperature reading has stabilized.
Press the key.
PGM
The lower display shows "Cal1" with the decimal point flashing.
When the pH value display has stabilized, use the
displayed value to the value of the first reference buffer.
Press the key.
PGM
The lower display shows "Cal2" with the decimal point flashing.
Take the pH electrode and, if necessary, the temperature probe out of the
first buffer solution and rinse with water.
Immerse the pH electrode and, if required, the Pt100 or Pt1000 temperature
probe in the second buffer solution.
When the pH value display has stabilized, use the
displayed value to the value of the second reference buffer.
Press the key.
PGM
The instrument stores the new zero and the new slope.
The instrument is in the measurement mode again.
If, on completion of calibration, the instrument shows "Err" in the
temperature display,
Chapter 34.1 "Messages", page 101ff.
or keys.
or keys to set the
or keys to set the