Air pressure transmitter

Measuring and testing – Fluid pressure gauge – Vibration type

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73718, 361283, G01L 912

Patent

active

042928508

ABSTRACT:
An air pressure transmitter for measuring air pressure having a circular diaphragm arranged in a measuring chamber, said diaphragm being surrounded on both sides by thin air layers and limited by rigid walls. The body of the air layers influences the natural frequency of the diaphragm. In order to achieve a high accuracy of measurement and to exclude calibrating instabilities, the diaphragm is configured as a plate of hard beaten material and clamped at its edge between the rigid walls with distance rings of such a thickness that the restoring force of the air layers located within the distance rings, at atmospheric pressure will become approximately three to ten times as high as the restoring force of the diaphragm. The diaphragm itself is inductively excited.

REFERENCES:
patent: 3000215 (1961-09-01), Atanasoff et al.
patent: 3425281 (1969-02-01), Barz
Abstract No. 136,212, "Pressure Sensitive Apparatus", Janssen, O. G., 10/28/52, vol. 663, p. 1224.

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