Conductivity Measurement; Temperature Compensation; Non-Linear Temperature Compensation According To En 27888 - Lovibond Tintometer SD 335 Multi Bedienungsanleitung

7.3 Conductivity measurement

Before measurement, you should familiarise yourself with some of the instrument settings in
the confi guration menu. Pay particular attention to the following settings options:
Selection
of the temperature input
(electrode specifi c)
Selection
of the reference temperature of
the temperature compensation
Selection
of the type of temperature
compensation

7.4 Temperature compensation

The conductivity of aqueous solutions is temperature dependent. The conductivity of a solution can
be calculated back to a standard reference temperature by means of temperature compensation.
Commonly used reference temperatures for comparing conductivities are 25°C and 20°C. If the
measurement is carried out at a set reference temperature, no temperature compensation is required.

7.4.1 Non-linear temperature compensation according to EN 27888

For most applications, for example in the fi eld of fi sh breeding and the measurement of surface
and drinking water, the non-linear temperature compensation for natural water is suffi ciently
accurate. The usual reference temperature is 25 °C.
Recommended conductivity range for non-linear temperature compensation: 60 to 1000 µS/cm
56
• NTC
• Pt
• 25 °C
• 20 °C
• none
• non-linear
• linear
Rinse the electrode with distilled or deionised water and then with
the sample.
Immerse the measuring cell in the sample. During measurement,
ensure that there are no air bubbles on the electrode surface and
that the electrode, as well as the temperature sensor, are suffi ciently
surrounded by the sample.
The measurement value can now be read off from the display. In the
parameter confi guration you can change the conductivity to TDS or
salinity if required.
Conductivity measuring cell LC 12
Conductivity measuring cell LC 16
SD_335_1 06/2020