Devices to Measure Electrical Conductivity

There are many different devices suitable to measure electrical conductivity in water based systems. Conductivity of such systems is rather high, above 0.0001 S/m up to 10 S/m. If one wants to measure electrical conductivity at this high range, he has a wide selection of devices from which to choose.

The situation with non-aqueous conductivity is quite different. First of all, it is orders of magnitude are lower than in water-based systems. Usually it ranges from 10-12 to 0.0001 S/m. This low conductivity level requires a completely different approach to measure it, as compared to the water based systems. Our non-aqueous conductivity probe DT-700 uses coaxial cylinders chamber with particular cell constant. Driving electric field can be AC for several frequencies from 1 to 20 HZ, or even DC. The last option satisfies the US standard on non-aqueous conductivity measurement. Our design makes it possible to perform non-aqueous conductivity measurement for complete conductivity range. The AC field option is especially useful for heterogeneous systems due to its prevention of particle deposition on electrodes. There are no comparable instruments on the market to date.

Non-aqueous Conductivity

Non-aqueous conductivity is a very useful method of characterizing electrochemistry of low- and non-polar liquids. It increases with increasing surfactant content. Also, conductivity of such liquids could depend on various contaminations. Measurement of non-aqueous conductivity could serve as a method of monitoring such contaminations. These might be important for fuels conductivity. It is well known that fuel's conductivity must be elevated with special additions in order to prevent built up of electrostatic charges. One must be able to measure electrical conductivity of fuels in order to optimize content of such additives.

Our non-aqueous conductivity probe can be used for measuring sizes of ions in non-aqueous systems. It is known that ion size is much larger in non-aqueous systems compared to the water-based. Our electroacoustic zeta potential probe DT-300 can be used for ion size determination in water based systems.

More information:
Streaming Current
Bulk Viscosity
Particle Size Measurement
Zeta Potential Analyzer