Automatic Ph Calibration - Dostmann pH 7 Vio Manuel D'utilisation

P1.9 Temperature calibration
All the instruments of this series are pre-calibrated for a correct temperature reading. However, if there is
a difference between the measured and the real temperature (usually due to a probe malfunction), it is
possible to perform an offset adjustment of + 5°C.
Use the keys and

• Automatic pH calibration

Example: three-point calibration with USA type buffers (7.00 / 4.01 / 10.01).
• In pH measure mode
The string "1ST POINT PH 7.00" appears on the display; the device requires the neutral value as the
first calibration point.
Rinse the electrode with distilled water and gently dab with paper towel. Dip the electrode in the pH
7.00 buffer solution.
• When the signal is stable, the red bands are replaced by the stability
icon .
Press the key
The measured value flashes on the display and then the icon of the pH
7.00 beaker appears at the bottom left, indicating that the
instrument is calibrated on the neutral point.
• Remove the electrode, rinse with distilled water and dab gently with absorbent paper. Dip the sensor
in the pH 4.01 buffer solution ("CHANGE BUFFER").
The instrument is now ready to recognize the second calibration point.
•
Next to the string "2ND POINT PH" the different buffers, that the device can recognize automatically,
scroll.
• When the 4.01 value is recognized and the icon
the string "PRESS OK".
The actual measured value and the Slope% flash on the display; subsequently, the icon of the beaker
pH 4.01 appears next to the green beaker, indicating that the instrument is calibrated in the acid
field.
Remove the electrode, rinse with distilled water and dab gently with paper towel. Dip the sensor in
•
the pH 10.01 buffer solution ("CHANGE BUFFER").
The instrument is now ready to recognize the third calibration point.
•
Next to the string "3RD POINT PH", the different buffers, that the device can recognize automatically,
scroll.
• When the value 10.01 is recognized and the icon
the string "PRESS OK".
Switching from an acidic to a basic pH may take a few more seconds to achieve stability.
The actual measured value and the second Slope% flash on the display; subsequently, the icon of the
beaker pH 10.01
calibrated in the alkaline field.
Series 7 Vio ENG Version 2.0 April 2020
to correct the temperature offset value and confirm with
press the key to enter calibration mode.
as indicated by the string "PRESS OK".
appears next to the green and red beakers, indicating that the instrument is
19
appears, press the key
appears, press the key
.
as indicated by
, as indicated by
EN