[특허]Liquid level sensor and electrode assembly therefor

Liquid level sensor and electrode assembly therefor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01H-035/18
출원번호	US-0543193 (1975-01-22)
발명자 / 주소	Jackson John A. (Oshawa CA)
출원인 / 주소	Jackson John A. (Scarborough CA 15) Bangay Albert (Scarborough CA 15Part interest to each)
인용정보	피인용 횟수 : 35 인용 특허 : 0

초록 ▼

A system for detecting the fluid level in an intravenous bottle wherein a disposable electrode assembly, consisting of a piece of tape having upper, middle and lower electrode strips, is adhered to the bottle and connected to sensing equipment. The upper strip is longer than the middle strip and the middle strip is longer than the lower strip, so that the capacity between the upper and middle strips (C1) is normally greater than that between the middle and lower strips (C2). The sensing equipment includes a bias capacity (C3) connected between the middle and lower strips so that C1 is less than C2 plus C3 except when the tape is on a bottle with the fluid level in the bottle above the top strip. Pulses having a gradually sloped leading edge and a steep trailing edge are fed to the centre strip. The received pulses at the top and bottom strips are differentiated and fed to the inputs of a differential amplifier which produces an output which changes in polarity when the fluid drops below the upper electrode strip. A delay circuit generates an alarm signal after the changed polarity output signal has persisted for a predetermined interval. If the tape falls off the bottle or becomes disconnected from the sensing equipment, the alarm signal will be produced.

대표청구항 ▼

Apparatus for detecting the level of fluid in a non-conducting container and comprising: a. detector means mountable against the exterior surface of said container and having three spaced capacitance plate members, namely an upper member, a lower member and a middle member between said upper and lower members, the capacity between said upper and middle members being C1, the capacity between said lower and middle members being C2, and the value of C1 being greater than that of C2 when said detector means is located in air and also when said detector means is mounted on said container with the fluid level in said container above or below said detector means, b. circuit means including a bias capacitance of capacity C3 detachably connected between said lower and middle members, the value of C3 being such that when said detector means is located in air or on said container with the fluid level in said container below said upper member, the value of C1 is less than the combined values of C2 and C3, and when said detector means is on said container with the fluid level in said container above said upper member, C1 is greater than the combined values of C2 and C3, c. said circuit means including means for comparing the value of C1 with the combined values of C2 and C3 and operative to produce an alarm signal when the value of C1 is less than the combined values of C2 aNd C3.

이 특허를 인용한 특허 (35)

Arthur Hugh M. (London GB2) Harrington Timothy C. (London GB2), Apparatus for determining the length of a column of tobacco or similar material.
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Larson Roger G. (911 Laguna Rd. Fullerton CA 92635), Apparatus for determining the liquid level in a tank.
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Larson Roger G. (911 Laguna Rd. Fullerton CA 92635), Apparatus for determining the liquid level in a tank.
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Khurgin Boris (14 David Marcus Haifa ILX), Apparatus for measurement of quantity of liquid in container.
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Davis James E. (Wilmington DE), Capacitive liquid interface sensor.
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Zabel, Andreas; Mergel, Stefan, Capacitive liquid level detector for direct methanol fuel cell systems.
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Davis James E. (Wilmington DE), Capacitive liquid level sensor.
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Pomerantz ; Daniel I. ; Sandler ; Louis M., Capacitive means for measuring the level of a liquid.
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Klebanoff ; Leonard, Condenser plate assembly.
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Lively, Olin A., Control circuitry for water level control of pools.
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Zhou, Yonghong, Device and method for detecting characteristics of a material occupying a volume with capactive sensing of mirrored plates.
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Turnbull,Clifford W., Fluid level sensing apparatus and method for a spray applicator.
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Germain, Aaron; Walker, Michael D.; Roland, Jacob; Echeverry, Jan, Fluid management systems and methods.
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Heinze Werner (Klberweide 1 D-8911 Finning DEX), Level indicator for liquid reservoirs.
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Wotiz, Richard A., Liquid level indicator.
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Shimura, Jusuke, Liquid tank and fuel cell.
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Griffiths,Robert W.; Draper,R. Bruce, Method and apparatus for detection of fluid level in a container.
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Feng, Jun; Miao, Xueming, Method for determining the empty state of an IV bottle in an IV infusion monitoring device.
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Suzuki Takeo (Kawasaki JPX), Method of announcing low level of remaining liquid in dropper.
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Zand Farnaz ; Haussler Warren M., Moisture detection apparatus.
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Mahoney ; Kurt, Moisture detector.
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Zand, Farnaz; Haussler, Warren M.; Evans, Robert E., Moisture sensing apparatus.
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Tschanz, Thomas, Non-invasive gauge glass liquid level sensor apparatus.
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Morgan ; III Charles L. (P.O. Box 739 Katy TX 77492-0739), Probeless fluid level controller.
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Calabrese, Ronald V., Self-calibrating liquid level transmitter.
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Calabrese,Ronald V., Self-calibrating liquid level transmitter.
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Calabrese,Ronald V., Self-calibrating liquid level transmitter.
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Edelmann, David Charles; Cartwright, Richard W.; Hoying, Gary V., Systems and methods for controlling warewasher wash cycle duration, detecting water levels and priming warewasher chemical feed lines.
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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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Dickey, Larry M.; Fischer, David L.; Newcomer, Jeffrey R.; Watson, Michael T.; Prybor, Brian R.; Anim-Mensah, Alexander R., Warewash machine chemical sensor and related system and method.
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Dickey, Larry M.; Fischer, David L.; Newcomer, Jeffrey R.; Watson, Michael T.; Prybor, Brian R.; Anim-Mensah, Alexander R., Warewash machine chemical sensor and related system and method.
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Jung Chou K. (No. 16-2 ; Alley 12 ; Lane 106 ; Pao Chien Road Chung Ho City Taipei Hsien TWX), Warning device for liquid level in dripping bottle.
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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

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Liquid level sensor and electrode assembly therefor 원문보기

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Liquid level sensor and electrode assembly therefor 원문보기

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이 특허를 인용한 특허 (35)

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