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Hydrogen concentration measurements were developed for a series of experiments in which a molten oxide is mixed with water to study vapour explosion phenomena. The gas mixture to be analyzed consisted of hydrogen with water vapour and either helium or argon. Two types of sensor have been developed for these tests. The first is an ultrasonic sensor, which detects variations in the acoustic velocity within a 0.4mm-diameter palladium wire. The sensor measures hydrogen concentrations between 0.1-100%, at atmospheric pressure, over an operating range of 200-400 degrees Celsius. The response time is ~30 s at 180 degrees Celsius and 8 s at 380 degrees Celsius. The second sensor consists of a palladium coil, constructed with 0.05 mm diameter wire that is wound on a ceramic tube. Measurements of wire resistance were used to detect hydrogen pressure. This sensor operates at 150-300 degrees Celsius and measures hydrogen concentrations of 1-100%. The response time is short, 1-2s for a temperature of 300 degrees Celsius.

Additional information

Authors: ANSELHI H, Paul Scherrer Institute, Villigen (CH);HUHTIEMI I, Paul Scherrer Institute, Villigen (CH)
Bibliographic Reference: Article: Measurement Science and Technology (1999)
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