Dostmann pH 7 Vio Manuel D'utilisation page 18

USA Buffers: 1,68 - 4,01 - 7,00** - 10,01 (Factory setting)
NIST Buffers: 1,68 - 4,00 - 6,86** - 9,18
**Neutral point always requested as first
In measure mode at the bottom left of the display, a series of beakers
indicates the buffers with which the last automatic and manual
calibration was carried out.
P1.2 Resolution
Access this menu to choose the resolution needed, when reading the
pH parameter:
• 0.1
0.01 -default-
•
P1.3 Stability criteria in pH measurement
To consider the reading of a value truthful, we recommend waiting for the measurement stability,
indicated by the icon
the display.
Access this menu to change the measurement stability criterion:
"LOW": choose this option to bring up the stability icon
Readings included within 1.2 mV.
"MEDIUM" (default value): readings included within 0.6 mV.
"HIGH": choose this option to display the stability icon only in conditions of high measurement
stability, readings included within 0.3 mV.
P1.6 pH Calibration data
Access this menu to get information about the last calibration performed. The following screens will
automatically scroll on the display:
• first screen: beakers indicating the buffers used;
• second screen: OFFSET value of the electrode expressed in mV;
third and possibly fourth screen: Slope% in the measuring range (one Slope% only if two calibration
•
points are performed, two Slope% if three points are performed).
Note: The instrument accepts calibrations with pH electrodes with Slope% between 80 - 120% only.
Outside this range of acceptability, the instrument does not allow to end the calibration and displays the
error message SLOPE OUT OF RANGE.
P1.8 Reset of pH parameter
If the instrument does not work perfectly or incorrect calibrations have been carried out, confirm YES
with the button to take all the parameters of the pH menu back to the default settings.
IMPORTANT: The factory reset of the parameters DOES NOT erase the stored data.
Series 7 Vio ENG Version 2.0 April 2020
. When the measurement is not stable, four red flashing bands
18
Beaker Buffer value
Acid
< 6.5
Neutral
6.5 ~ 7.5
Basic
> 6.5
appear on
even in conditions of poor stability.
EN