High Frequency Inductance Manometer for Gaseous Reaction Studies

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Abstract
A corrosion-free manometer which employs a variable inductor as a transducer has been devised. Its main part consists of a pair of small coils and a glass Bourdon bulb on which a thin aluminum disc is so attached as to be located between the coils. A manometer constructed as an example has the following characteristics: measurable (linear) range of pressure difference, 0–20 mmHg; minimum detectable pressure difference, 7×10−2 mmHg; temperature coefficient of zero-point drift, 0.2% of the full scale (20 mmHg) per degree; negligible temperature coefficient of output voltage per unit of pressure difference; limit of response time, 0.6 sec (under atmospheric pressure)–4 sec (1.1×10−3 mmHg). It is possible to extend the measurable range by changing the rigidity of the Bourdon bulb. From these results, it may be concluded that the manometer is useful in following and recording changes which have half-decay times of longer than a few seconds. When the manometer was applied to the study of the catalytic decomposition of formaldehyde on nickel wire, its usefulness was proved.

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