KR19980075238A - Level measurement method using strain gauge load cell - Google Patents
Level measurement method using strain gauge load cell Download PDFInfo
- Publication number
- KR19980075238A KR19980075238A KR1019970011392A KR19970011392A KR19980075238A KR 19980075238 A KR19980075238 A KR 19980075238A KR 1019970011392 A KR1019970011392 A KR 1019970011392A KR 19970011392 A KR19970011392 A KR 19970011392A KR 19980075238 A KR19980075238 A KR 19980075238A
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- load cell
- level
- change
- strain gauge
- weight
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/40—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using bands or wires as transmission elements
- G01F23/44—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using bands or wires as transmission elements using electrically actuated indicating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Level Indicators Using A Float (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
본 발명은 액위, 수위의 변화에 따라 부력추에 작용하는 부력의 변화량을 스트레인게이지식 로드셀의 무게 측정 기능을 이용하여, 부력추에 가해지는 부력의 변화에 따른 로드셀의 전기신호 변화로 액위, 수위를 측정할 수 있게 한 방법이다.According to the present invention, the amount of change in buoyancy acting on the buoyancy weight according to the change of the liquid level and the water level is determined by using a strain gauge load cell weight measurement function. It is a method that can measure.
측정 방법의 구성은 스트레인게이지식 로드셀에 줄로써 부력추를 연결하여 측정하고자 하는 액체에 부력추를 넣어서 액위 변화에 의한 부력추의 무게 변화를 스트레인게이지식 로드셀에 의해 변화되는 전기신호의 해석으로 액위, 수위를 아주 간단한 구조로 측정할 수 있게 한 측정 방법이다.The configuration of the measuring method is to connect the buoyant weight with a strain gauge load cell and insert a buoyant weight into the liquid to be measured so that the weight change of the buoyant weight due to the change of the liquid level is analyzed by the electrical signal that is changed by the strain gauge load cell. In other words, it is a measurement method that makes it possible to measure the level of water with a very simple structure.
측정에 있어서 마찰이 전혀 작용하지 않으므로 0.002센티미터의 미소한 액위 변동에서부터 40미터 이상의 넓은 변동 범위까지 정밀하게 액위, 수위를 측정할 수 있게 한 방법으로 모든 액체의 액위, 수위 변화 측정에 사용이 될 수 있다.Since friction does not affect the measurement at all, it can be used to measure liquid level and level change of all liquids by precisely measuring the liquid level and the level from minute level fluctuation of 0.002 centimeters to wide range of more than 40 meters. have.
Description
제1도 측정방법의 계통도Diagram of measuring method
본 발명은 산업에 많이 필요로 하는 액체 탱크내에 남아있는 액체의 양을 알기위해 측정하는 액위, 수위(이하 액위)를 정확하게 측정하여 남아있는 액체의 양을 정확하게 알기 위한 측정 방법이다.The present invention is a measurement method for accurately determining the level of liquid remaining by measuring the liquid level and the water level (hereinafter referred to as the liquid level) to measure the amount of liquid remaining in the liquid tank which is much needed in the industry.
종래의 측정방법으로 부자식의 한 방법인 아르키메데스(Archmedes)의 원리를 응용하여 측정하고자 하는 액체의 액위가 변화하면 디스플레이스(displacer)의 부력추 부력을 변화시켜 이것을 톨크튜브(torque tube)의 비틀림 모멘트(moment)로 변화시켜 이를 호올소자에 전달하여 그 비틀린 각도로 액위를 측정하였다. 톨크튜브에 힘을 전달하는 방법으로 지렛대의 원리를 이용하였기 때문에 각 지지점마다 마찰이 있어 미소한 변동량(액위 변화 0.002 센티미터(cm) 이하)를 측정하는 것은 불가능하며, 힘의 측정 부분의 기기 구조가 복잡하여 제작 비용이 많이 들며, 제작에 있어 마찰을 줄여야 하는 기술적인 어려운 점이 많이 있었다. 또한 측정하고자 하는 액체의 밀도가 다를 경우에는 액위 변화에 따른 부력이 달라짐으로 해서 톨크튜브의 변화량 지렛대의 길이 변화를 물리적으로 조정해야 하는 어려운 점이 있었다.When the liquid level of the liquid to be measured is changed by applying the principle of Archimedes, which is a conventional method of the child, the buoyancy and buoyancy force of the displacer is changed and this is the torsion of the torque tube. It was changed into a moment and transferred to the hool element, and the liquid level was measured at the twisted angle. Since the lever principle is used as a method of transmitting the force to the tolk tube, it is impossible to measure the small fluctuation amount (less than 0.002 centimeter change in liquid level) due to the friction at each support point. It is complicated and expensive to manufacture, and there are many technical difficulties in reducing friction in the production. In addition, when the density of the liquid to be measured is different, the buoyancy is changed according to the change of the liquid level, which makes it difficult to physically adjust the change in the length of the tolk tube lever.
본 발명은 이러한 측정기기의 문제점인 측정기기의 복잡성, 미소 액위 변동량 측정의 문제점 그리고 제작의 어려움, 측정액체의 밀도변화에 따른 물리적 조정 등의 문제점들을 완전히 해결한 측정 방법이다. 구성은 스트레인게이지식로드셀(1)(이하 로드셀), 줄(2), 부력추(3)로 구성되며, 로드셀은 액위의 변화에 따라 부력추에 작용하는 부력의 변화량에 따라 저항의 변화, 즉 인가 전압에 대한 전압의 변동으로 변화시키는 기능을 사용하여 로드셀의 출력 전압으로부터 액위 변화를 측정하게 하는 방법으로 로드셀에 줄로써 부력추를 연결하여 측정하고자 하는 액체에 부력추를 넣어 액위 변화에 다른 부력추 무게 변화를 로드셀에 의해 변환되는 전기신호를 해석함으로 해서 간단한 측정 구조의 액위를 측정하게 하였다.The present invention is a measurement method that completely solves the problems of the measuring device, which is a problem of the measuring device, the problem of measuring the micro-liquid fluctuation amount and the difficulty of manufacturing, and the physical adjustment according to the density change of the measuring liquid. The configuration is composed of a strain gauge load cell 1 (hereinafter referred to as a load cell), a string 2, and a buoyancy weight 3, and the load cell has a change in resistance according to a change in buoyancy force acting on the buoyancy weight according to the change of the liquid level. A method of measuring the liquid level change from the output voltage of the load cell by using the function of changing the voltage with respect to the applied voltage.The buoyancy weight is connected to the load cell by connecting the buoyant weight to the load cell. The weight change of the weight was analyzed by the electric signal converted by the load cell to measure the liquid level of the simple measurement structure.
로드셀은 한 개의 구조체로 운동 부분이 없고 마찰이 없으므로 미소한 액위 변동량과 넓은 액위 변동량을 정밀하게 측정할 수 있다,Since the load cell has no moving parts and no friction in one structure, it is possible to precisely measure minute and wide liquid level fluctuations.
예 1) 사용용량 120 gram 짜리 로드셀에 대해 1/10,000의 측정 정밀도로 직경 2.75센티미터 길이 20센티미터의 부력추를 사용하여 밀도 1인 액체를 측정하면, 20센티미터의 1/10,000인 0.002센티미터까지 액위 변화를 분해하여 측정할 수 있다.Example 1 A liquid with a density of 1 is measured using a buoyant weight of 2.75 centimeters in length and 20 centimeters in length for a 120 gram load cell with a 120 gram load cell. It can be measured by decomposing
예 2) 사용용량 20,000 gram 짜리 로드셀에 대해 1/10,000의 측정 정밀도로 직경 2.5센티미터 길이 40미터의 부력추를 사용하여 밀도 1인 액체를 측정하면, 40미터의 1/10,000인 0.004미터(0.4센티미터)까지 액위 변화를 분해하여 측정할 수 있다.Example 2 Measuring a liquid of density 1 using a buoyant weight of 2.5 centimeters in length and 40 meters in length for a load cell weighing 20,000 grams with a precision of 1 / 10,000, 0.004 meters (0.4 centimeters) of 1 / 10,000 of 40 meters The change in level can be broken down and measured.
기존의 복잡한 구조의 측정 부분을 단 한개의 로드셀로 대체하여 구조가 아주 간단하여 제작에 어려움이 없고 저렴한 가격에 제작을 할 수 있다. 로드셀은 측정부가 하나의 구조체로 되어 있어 유지 보수가 필요없으며, 수명이 반 영구적이다. 또한 운동부가 없으므로 액체의 밀도변화에 따른 변위를 조절할 필요없이 전기신호값에 대한 보정으로 간단하게 처리할 수 있다.By replacing the measurement part of the existing complex structure with only one load cell, the structure is very simple, so it is not difficult to manufacture and can be manufactured at low price. The load cell is a maintenance structure with no measuring part, and the life is semi-permanent. In addition, since there is no moving part, it is possible to simply process the correction of the electric signal value without the need to adjust the displacement according to the density change of the liquid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970011392A KR100229502B1 (en) | 1997-03-29 | 1997-03-29 | Water level measuring method using strain gauge type load cell |
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| KR1019970011392A KR100229502B1 (en) | 1997-03-29 | 1997-03-29 | Water level measuring method using strain gauge type load cell |
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| KR19980075238A true KR19980075238A (en) | 1998-11-16 |
| KR100229502B1 KR100229502B1 (en) | 1999-11-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102672406B1 (en) | 2022-12-27 | 2024-06-07 | 주식회사 에이치큐테크 | Apparatus for managing flood measurement device using verification water |
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1997
- 1997-03-29 KR KR1019970011392A patent/KR100229502B1/en active IP Right Grant
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102672406B1 (en) | 2022-12-27 | 2024-06-07 | 주식회사 에이치큐테크 | Apparatus for managing flood measurement device using verification water |
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| KR100229502B1 (en) | 1999-11-15 |
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