XS Instruments Revio Manual De Instrucciones página 30

Last calibration data
Access this menu to get information on the last calibration performed.
The effective cell constant applied after calibration is reported for each measurement range.
Due calibration
Enter this menu to set a calibration deadline; this option is essential in GLP protocols.
No calibration deadline is set by default; use the keys
•
must elapse between two calibrations and confirm with button
• When a calibration deadline is set for a parameter, it is indicated in measure mode with
the icon .
• When the calibration reaches the set deadline, it will no longer be possible to make measurements
for that parameter until the calibration is performed again or the deadline deactivated.
• The error symbol
the sensor to continue the measurements.
Temperature compensation in conductivity measurement should not be confused with the temperature
compensation for pH measurement.
In a conductivity measurement, the value showed on the display is the conductivity calculated at the
reference temperature. Therefore, the effect of temperature on the sample is corrected.
On the contrary, in a pH measurement, the value showed is the pH at the displayed temperature. The
temperature compensation involves the adaptation of the slope and the electrode offset at the measured
temperature.
Reference temperature
The conductivity measurement is strongly temperature dependent.
If the temperature of a sample increases, its viscosity decreases and this leads to an increase in ion mobility
and of the measured conductivity, despite the concentration remains constant.
For each conductivity measurement the temperature to which it is related must be specified, otherwise it is
a worthless result. Generally, the temperature refers to 25 °C or more rarely to 20 °C.
This device measures the conductivity at the actual temperature (ATC or MTC) and then convert it to the
reference temperature using the correction algorithm chosen in program.
"Temp compensation factor"
Access this setup menu to set the temperature at which you want to refer the Conductivity
•
measurement.
The device is able to report Conductivity from 15 to 30 ° C. By default, it is 25 ° C, which is suitable for
•
most of the analyses.
Temperature compensation factor
It is important to know the dependence on temperature (percentage variation of conductivity every °C) of
the sample being measured. To simplify the complex relationship between conductivity, temperature and
ionic concentration, different compensation methods can be used:
Linear Coefficent 0.00...10.0 %/°C -default value 1.91 %/°C - For the compensation of medium and high
•
conductivity solutions, linear compensation can be used.
The default factory value is fine for most of the routine measures in aqueous solutions.
UM ReVio EN rev.0 04.06.2020
and a message will appear on the display, which invites the user to recalibrate
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and to choose days or hours that
.
EN