Level detector using oscillator circuit with two capacitive prob

Details Level detector using oscillator circuit with two capacitive prob Level detector using oscillator circuit with two capacitive prob

1975-06-18

1977-01-11

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

73304C, 128214E, 137392, 324 61P, 331108B, 340244C, A61M 514, G01F 2326, H03B 512

Patent

active

040029964

ABSTRACT:
This invention relates to a device for detecting a fall of level of flowable material in a closed container by emitting an oscillation. It is electronic in nature and the circuit has an amplifier with a feed-back terminal that is connected to a feed-back network. The feed-back network in turn includes two vertically spaced apart identical probe condensers each having an open dielectric space and each being in different feed-back paths of the feed-back network. The feed-back network is activated as the level of the flowable material drops, whereby the difference in the dielectric material of the condensers provides a change in input current to the amplifier. The circuit is responsive to a positive change in input current to cause the amplifier to commence oscillation on dropping of the level past the condensers to signal the drop of the level of the flowable material. The device is stable in design, low in cost and easy and reliable to use. In particular it requires no adjustment with variations of flowable material.

REFERENCES:
patent: 3042908 (1962-07-01), Pearson
patent: 3254333 (1966-05-01), Baumoel
patent: 3588859 (1971-06-01), Petree

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