16
UM Serie 50VioLab EN rev.1 19.05.2020
EN
The instrument automatically recognizes 2 families of buffers (USA and NIST); in addition, the user has the
option of performing a manual calibration up to 2 points with customizable values.
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 criterion in pH measurement
To consider the reading of a value truthful, we recommend waiting for the measurement stability, indicated
by the icon
. When the measurement is not stable, four red flashing bands
appear on the display.
Access this menu to change the measurement stability criterion:
“LOW”: choose this option to bring up the stability icon
even in conditions of poor stability.
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 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
button
to take all the parameters of the pH menu back to the default settings.
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
to correct the temperature offset value and confirm with
.
Beaker
pH value of the
buffer
Acid
< 6.5
Neutral
6.5 ~ 7.5
Basic
> 6.5
Summary of Contents for COND 50 VioLab
Page 1: ......
