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SF6 Gas & Measurement Theory

SF6 Gas & Measurement Theory

MBW has more than forty years of experience measuring water vapor (moisture, humidity, dew point, frost point, ppmv, ppmw) in SF6 gas applications. We have supplied thousands of dew point measurement systems, many of which remain in daily use despite being in use for +20…30 years. Our fundamental measurement technology provides the highest possible accuracy and long-term stability so that engineers can depend on good measurements when they need them, without regular and expensive sensor calibration or replacement.

Together with our sister company in the USA, RH Systems, MBW developed the very first SF6 purity measurement using the condensation technique that condenses SF6 and measures temperature and pressure to resolve the most precise and reliable method of determining SF6 purity.

Alongside the SF6 purity measurement innovation, MBW/RHS also introduced the first SF6 collection and pump back system so that no gas is released in to the atmosphere during the measurement phase.

Explore this great resource working group, Cigré.  Cigré is a collaborative global community committed to the world’s leading knowledge development programme for the creation and sharing of power system expertise.  MBW/RHS are active contributors to SF6 measurement guides and to the development of better understanding of this complex application.

Resources on SFGas Analysis

Measurement of Water Vapor in Sulphur Hexafluoride, SF6


Bob Hardy, RH Systems, Albuquerque, NM, USA
Daniel Mutter, MBW Calibration, Wettingen, Switzerland

Sulphur hexafluoride, SF6, is a non-toxic, inert, insulating and cooling gas of high dielectric strength and thermal stability. Due to its high dielectric strength, it is particularly suited for application in high power circuit breakers as well as in high-voltage cables, transformers, and switchgears. The excellent arc-quenching and insulating properties of SF6 allow the construction of new circuit breakers and switching stations of higher voltage in smaller size with less noise.

On-Site SFGas Analysis Abstract


Daniel Mutter, MBW Calibration, Wettingen, Switzerland

This report reviews some of the current issues relating to the gas analysis of SFgas filled equipment used throughout the power grid.