ALFF ENGINEERING www.alff-engineering.ch Switzerland ALFF ENGINEERING www.alff-engineering.ch Switzerland ALFF ENGINEERING www.alff-engineering.ch SWITZERLAND ALFF ENGINEERING www.alff-engineering.ch Switzerland ALFF ENGINEERING www.alff-engineering.ch Switzerland Conductivity Meter for Liquids LCM-8716 A QUICK INTRODUCTION HOW TO PERFORM EASY AND ACCURATE MEASUREMENTS OF CONDUCTIVITY AND TANON INSULATING LIQUIDS
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Characterisation of electrical insulating liquids with conductivity, permittivity and
dissipation factor
IEC 60296 Standard: Fluids for electrotechnical applications – Unused mineral insulating oils for transformers and switchgear
IEC 60422 Standard: Mineral insulating oils in eletrical equipment – Supervision and maintenance guidance
IEC 61099 Standard: Specifications for unused synthetic organic esters for electrical purposes
These quantities are very sensitive to the presence of soluble polar contaminants and aging products. For the recommended limits see the following standards:
Advantages of the „low amplitude, low frequency“ method in comparison
to the classic method with AC excitation voltage:
Accurate measurement of conductivity (respectively dissipation) factor
Simple design of test cell, low excitation voltage of only 30 V
No influence onto the properties of the liquid proprieties during the measurement (from charge injection into the liquid tested from measuring electrodes).
Comparatively cheap price of cell and measurement instrumentation.
Portable, low weight, no mains required, easy to clean
Evaluation software “LCM-8716 calculator”Generation of reportsInput quantities equal to measured quantitiesComputed quantitiese.g. tan in function of temperature (extrapolation)
Characterisation of temperature dependency from measurement of liquid tested at two different temperatures