[특허]Liquid level gauging apparatus

Liquid level gauging apparatus 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01F-023/26
출원번호	US-0459591 (1974-04-10)
발명자 / 주소	Ells Edward G. (Norwich NY)
출원인 / 주소	Liquidometer Corporation (Norwich NY 02)
인용정보	피인용 횟수 : 27 인용 특허 : 0

초록 ▼

A liquid level gauge for monitoring the height of liquid in a storage tank or the like. The gauge comprises an upright conducting probe adapted to be immersed in the liquid in the tank, and an upright series of electrodes closely adjacent the probe. The latter is adapted to be excited from a source of a.c. voltage generated by an astable multivibrator. Each of the electrodes is connected to the input of an amplifier through a rectifier circuit. The amplifiers are of the digital comparator type and have output terminals respectively connected by means of summing resistors to an electrical indicator such as a milliammeter, which provides an indication of the number of amplifiers being driven to full output at any particular time. The arrangement is such that each of the electrodes constitutes one plate of a capacitor, the other plate being formed by the single upright conducting probe. When a particular electrode is above the level of fluid in the tank, the magnitude of the a.c. signal received at the electrode is of a sufficiently small magnitude to provide only a low level drive voltage to its respective comparator amplifier, the latter thus assuming a low output signal level. Once a particular plate becomes submerged, the increased dielectric constant (fluid) effects an increase in the value of the capacitor, and a correspondingly larger drive signal to the amplifier results, causing the output thereof to assume a high level and yielding a contribution to the meter reading through the respective summing resistor. The meter reading thus responds to the number of electrodes submerged at any particular time, and provides an indication of the liquid level in the tank.

대표청구항 ▼

In a liquid storage installation, a liquid-level indicator means comprising, in combination: a. a storage tank having a large body of liquid stored therein, b. an upright, electrically conducting probe device immersed in said body of liquid and adapted for contact at a multiplicity of levels therewith, c. a second probe device cooperable with said first-mentioned probe device, said second prove device comprising an upright row of electrodes insulated from each other and adapted for immersion in said body of liquid in proximity to said first-mentioned probe device so as to form a plurality of capacitors therewith, d. an electrical guard comprising a conducting cylinder encircling said probe devices, e. means connected with said guard for maintaining it at a predetermined level of potential, f. means for generating an a.c. signal having a substantially constant frequency and for applying it to the first probe device, portions of said signal being capacitively coupled to said electrodes, g. a plurality of rectifier and filter circuits having output terminals, and having input terminals connected with said electrodes, respectively, so as to receive energy therefrom, h. a plurality of comparators having first input terminals connected respectively with the output terminals of said rectifier and filter circuits, having second input terminals connected to means having a constant D.C. potential, and having output terminals, i. a plurality of summing resistors connected respectively to the output terminals of said comparators, and j. a meter, k. said summing resistors having a common lead connected to said meter such that contributions of each comparator are algebraically summed by the meter.

이 특허를 인용한 특허 (27)

Berrill Michael J.,GB6, Capacitance probe.
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Buck, Bernd; Gundlach, Jochen; Palata, Jaromir, Capacitive fill level measurement device.
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Spaargaren, Klaas, Capacitive level gauge.
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Pomerantz ; Daniel I. ; Sandler ; Louis M., Capacitive means for measuring the level of a liquid.
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Bristol Robert G. (Everett MA), Capacitive scheme for measuring the level of a liquid.
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Franklin Cecil (Shelburne VT), D.C. signal currents in capacitance gaging systems.
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Bristol Robert G. (Everett MA), Detection means for multiple capacitive sensing devices.
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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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Hannan Alan R. ; Nickolin Thomas M., Digital liquid level sensing apparatus.
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Hannan Alan R. ; Nickolin Thomas M. ; Lewis Ted W., Digital liquid level sensing apparatus.
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Hampo Richard Joseph ; Momcilovich Paul Theodore ; Stuntz Ross Maxwell, Fluid level sensing system.
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Koon Terry D. (Florence OR), Fluid level sensing system.
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Kitzinger Frank (Montreal CA) Rosenblum Frank (Ville St. Laurent CA), Froth level monitor.
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Koon Terry D. (1601 N. Rhododendron Dr. #645 Florence OR 97439), Level indicator.
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Koon Terry D. (1601 N. Rhododendron Dr. ; #645 Florence OR 97439), Level indicator.
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Edwards Harrison F. (Norwich NY), Liquid level gauge.
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Davies Keith (Robbinsville NJ) Meise William H. (Wrightstown Township ; Bucks County PA), Liquid sensor with high sensitivity near empty.
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Sanders, Gary G., Method and apparatus for circuit fault detection with boiler water level detection system.
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Ku,Chin Chung; Chen,Chih Kun; Lin,Chien hui, Portable liquid level detector.
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Milone, Christopher J., Printed hydrostatic versatile multiple liquid level switch.
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Eguchi, Takeo; Namekawa, Takumi; Takenaka, Kazuyasu; Horii, Shinichi, Remaining-liquid-amount display apparatus and remaining-liquid-amount display method.
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Spencer John D. (P.O. Box 2458 ; Dartmouth East Postal Station Dartmouth ; Nova Scotia CAX B2W 4A5), Robust electronic liquid level gauge.
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Capano, David, Scanning capacitive array sensor and method.
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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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Spaargaren Klaas (Amsterdam NLX) Leyen Adrianus C. W. (Amsterdam NLX), U-shaped capacitor level gauge.
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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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