[특허]Level detector using oscillator circuit with two capacitive probes

Level detector using oscillator circuit with two capacitive probes 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61M-005/14 G01F-023/26 H03B-005/12
출원번호	US-0587989 (1975-06-18)
발명자 / 주소	Klebanoff Leonard (Willowdale CA) Binnee Donald (Richmond Hill CA)
출원인 / 주소	Elkay Electronics Ltd. (Agincourt CA 03)
인용정보	피인용 횟수 : 31 인용 특허 : 0

초록 ▼

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.

대표청구항 ▼

A device for detecting a predetermined level of flowable material in a closed container by emitting an oscillation comprising a circuit, said circuit having an amplifier with a feed-back terminal, a feed-back network including two vertically spaced apart probe condensers each having an open dielectric space, means for connecting said feedback terminal to said feed-back network, said probe condensers each being in different feed-back paths of said feed-back network, said probe condensers each having a similar plate configuration and said feed-back paths being similar whereby the magnitude of the current through each of said condensers is substantially the same when the open dielectric space of said two probe condensers is filled with the same dielectric material and is substantially different when the dielectric space of one probe condenser is filled with different dielectric material to the dielectric space of the other probe condenser, means for deriving a resultant feed-back signal from the difference between the magnitudes of the currents through said probe condensers, the current through the upper condenser contributing a negative feed-back component to said resultant feed-back signal and the current through the lower condenser contributing a positive component to said rEsultant feed-back signal, said circuit being responsive to a positive resultant feed-back signal to said feed-back terminal to oscillate.

이 특허를 인용한 특허 (31)

Larson Roger G. (911 Laguna Rd. Fullerton CA 92635), Apparatus for determining the liquid level in a tank.
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Marx Alvin J. (107 Georgian Court Rd. Rochester NY 14610) Friedman William D. (Rochester NY), Automated intravenous fluid regulating and administering apparatus.
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Marx Alvin J. (107 Georgian Court Rd. Rochester NY 14610) Wobschall Darold C. (Williamsville NY), Automated intravenous fluid regulating and administering apparatus.
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Berrill Michael J.,GB6, Capacitance probe.
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Townsend Lawrence B. (Downers Grove IL), Capacitive level sensing device.
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Braun Hans (Karlsruhe DEX) Kessler Uwe (Oftersheim DEX), Circuit arrangement for signal recovery in a capacitive difference sensor.
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Kobayashi Toshiyuki (Kyoto JPX) Nakai Hideharu (Nagaokakyo JPX) Kai Isao (Kameoka JPX) Yonemori Yoshinori (Tokyo JPX), Dripping fluid level detector.
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Dulaff, Paul, Fluid containers with integrated level sensing.
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Spillman ; Jr. William B. (Charlotte VT), Fluid gauging apparatus with inductive interrogation.
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Koon Terry D. (Florence OR), Fluid level sensing system.
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Wieland, Manfred; Zacharias, Volker; Wierzoch, Jan, Implantable infusion pump with level measurement.
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Heinze Werner (Klberweide 1 D-8911 Finning DEX), Level indicator for liquid reservoirs.
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de Kock Michiel D. (144 Roedolf Avenue Clubview East ; 0140 Verwoerdburg ZAX), Level sensing device.
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Overton Raymond C. (Ponca City OK) Cole Charles F. (Ponca City OK), Liquid level controller.
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Wotiz, Richard A., Liquid level indicator.
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Schuler Alan L. (Hingham MA), Liquid level sensor.
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Albin Robert ; Cacciola John A., Liquid level sensor utilizing AC and resistance.
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Shimura, Jusuke, Liquid tank and fuel cell.
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Suzuki Takeo (Kawasaki JPX), Method of announcing low level of remaining liquid in dropper.
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McEwan Thomas E., Micropower RF material proximity sensor.
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Meijering, Antonie Hendrikus; Jacobs, Andreas Johannes Maria, Needle-less injector.
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Chen, Ye; Ding, Yuanpang Samuel; Muller, Matthew; Najdeni, Gert; Titus, Joel, Non-invasive radio frequency liquid level and volume detection system and method using phase shift.
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Chen, Ye; Ding, YuanPang Samuel; Muller, Matthew; Najdeni, Gert; Titus, Joel, Non-invasive radio frequency liquid level and volume detection system using phase shift.
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Chen, Ye; Ding, Yuanpang Samuel; Muller, Matthew; Najdeni, Gert; Titus, Joel, Non-invasive radio frequency medical fluid level and volume detection system and method.
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Morgan ; III Charles L. (P.O. Box 739 Katy TX 77492-0739), Probeless fluid level controller.
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Price, Jeffrey, Safety interlock system for an enteral feeding pump.
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Doug Duchon ; Thomas Paulson ; Vince Copa ; Robert F. Wilson ; Jiyan Liu, System for detecting air.
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Hills, Chris, Ultrasonic air and fluid detector.
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Crandall, Frank Anthony; Allen, Blake; Stringham, Mark; Luis, Joseph; Jovic, Olga; Blaine, David, Ultrasonic instrument using langevin type transducers to create transverse motion.
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Heger, Charles E., Wireless swimming pool water level system.
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Heger,Charles E., Wireless swimming pool water level system.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Level detector using oscillator circuit with two capacitive probes 원문보기

초록 ▼

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이 특허를 인용한 특허 (31)

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Level detector using oscillator circuit with two capacitive probes 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (31)

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