JUMO dTRANS pH 02, Operating Manual, Page: 57 / 136

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8 Calibrating a pH measurement chain
8.5 3-point calibration
✱
Make preparations, see chapter 8.2 "General information", page 51 .
✱
Start calibration, see chapter 8.2.2 "Ways to start the calibration", page 52.
✱
Select 3-point calibration.
✱
Immerse the combination electrode in the first buffer solution with the
known pH value.
✱
Start the 3-point calibration with the key.
✱
With manual temperature entry, use the and keys to set the
calibration solution temperature and confirm your entry with the key.
✱
Wait until the display value has stabilized; then press to continue.
The buffer solutions (reference solutions) used for calibration must have the
following values:
Buffer solution 1: in the neutral range (if possible precisely 7 pH)
Buffer solution 2: Greater than 9 pH
Buffer solution 3: Less than 5 pH
The temperature of the buffer solutions must be equal and remain constant
during calibration!
The buffer solutions can be used in any order during the calibration.
PGM
Now the source of temperature acquisition can be selected (manually, or using
the temperature input of the basic board, or the temperature input via the
optional board). This source will be active for the duration of the calibration.
An example follows: Manual temperature entry:
PGM
PGM