CN2622681Y - Self-calibration and capacitor type level gage - Google Patents
Self-calibration and capacitor type level gage Download PDFInfo
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- CN2622681Y CN2622681Y CN 03222606 CN03222606U CN2622681Y CN 2622681 Y CN2622681 Y CN 2622681Y CN 03222606 CN03222606 CN 03222606 CN 03222606 U CN03222606 U CN 03222606U CN 2622681 Y CN2622681 Y CN 2622681Y
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Abstract
The utility model relates to a novel self-calibration capacitor type level gage. The utility model adopts the design of a double-liquid level capacitive sensor and the proposal of top installation; on the basis of a coaxial cylindrical capacitor type liquid level measuring sensor, a set of an auxiliary capacitor type measuring sensor, and that is to say that a circuit of auxiliary capacitor type measuring sensor which is placed in a bottom area of a container and immerses in liquid media all the time for calibration is additionally arranged; the calibration sensor is parallel to the measuring sensor, is directly downwards arranged to the bottom area of the container from an installation hole on the top of the container, and immerses in liquid media all the time. The standardization of the utility model can automatically identify and automatically measure the dielectric coefficient of liquids to be measured in an on-line self-calibration mode at definite time without manual work, and continuously changed liquid level values of the liquids to be measured in the container can be automatically measured, calculated, displayed and output.
Description
Affiliated technical field
The utility model relates to a kind of the novel from demarcating the formula capacitance level gauge of non-electrically conductive liquid liquid level of measuring.
Background technology
Capacitance level gauge utilizes liquid and the different principle of air dielectric coefficient, measures according to the principle of liquid level height variable effect electric capacity size.According to this principle it also be applied to such as powdery and granular solids level gauging.The version of capacitance level gauge is a lot, has that mean pole is board-like, coaxial circles cartridge type, barrel cylinder formula or the like.Its scope of application is very extensive, the requirement of the character of medium own is not resembled other method strict, can both measure conducting medium and non-conductive medium, and energy measurement has inclination, rocks and the liquid level of the container of high-speed motion in addition.Not only can make fluid level controller, can also be used for continuous level gauging; And production cost is relative with selling price cheap.These characteristics of capacitance level gauge have determined its critical role in level gauging.
The weak point of known a few class capacitance level gauges is accurately to know the dielectric coefficient of fluid to be measured and liquid level top medium all the time at present, will really accomplish this point very difficulty and trouble in many application scenarios.With the petrochemical industry is example, can differ twenties percent at most because different regions produce the dielectric coefficient of crude oil and product oil, and same substance has dielectric coefficient to vary with temperature, and China overwhelming majority area throughout the year, the temperature difference of day and night is very big usually; Therefore, must often in time deliver to metrological service with good conditionsi to tested oil product for the accuracy that guarantees level gauging and do the analysis of oil product physical property, measure the dielectric coefficient of censorship petroleum product samples under each working temperature fast, by after being in charge of the technician and revising the capacitance level gauge indicating value and oil product (liquid) the dielectric coefficient table of comparisons, hand over the actual use of a line instrument worker again; Whole process will need just can finish for several working days through the cooperation of a plurality of departments usually, and therefore, conventional capacitance level gauge in fact all can not satisfy production scene accurately measuring liquid level requirement in real time.
For this reason, the capacitance level gauge that has be designed to artificial and instrument in conjunction with demarcation and correcting mode; First install or demarcate once more and timing is responsible for the technician and is accurately measured upper and lower two nominal position liquid level numerical value to the scene with other method, contrast capacitance level gauge poor in the indicating value of these two positions again, re-enter by this quasi-instrument operation instruction and demarcate and proofread and correct.
The storage tank of petrochemical iy produced and accumulating enterprise all is a closed container, and many product oils are volatile, inflammable, explosive; As adopt above common type capacitance level gauge, and want regular and carry out above-mentioned demarcation and proofread and correct not only difficulty, bothersome but also dangerous for guaranteeing measuring accuracy, influence ordinary production.
Install and fluid to be measured generation dielectric coefficient when changing first just because of above-mentioned known capacitance type liquid level tester (meter), need often carry out above-mentioned difficulties, take a lot of trouble even dangerous demarcation and correction problem have had a strong impact on these conventional capacitance type liquid level testers (meter) and apply for guaranteeing measuring accuracy.
Germany E+H company one point type is from demarcating the formula electrical capacitance levelmeter, nine younger sisters of Tang of Tongji University deliver exercise question at " chemical process automation and instrument " 1995.22 (3) p40-43 and are " band automatically demarcate and from (two point form) of normal moveout correction intelligent continous way electrical capacitance levelmeter ", this two class needs respectively to make one and two holes installation auxiliary capacitor sensors (capacitance switch is rod extremely) at container side wall from demarcating formula electrical capacitance levelmeter product, its principle of work is to be carried out respectively a bit according to the capacitance switch signal of setting up and 2 demarcation certainly by instrument, realizes that promptly instrument is automatically to measured matter dielectric coefficient measurement of comparison; Reach and reduce Yin Wendu and composition greatly and change the level gauging error that causes the fluctuation of measured matter dielectric coefficient and produce.
For petrochemical industry, for the band that German E+H company and the teacher of Tang proposition is installed needs all oil storages in the emptying jars from demarcating capacitance level gauge, again the big storage tank of common employing large-scale steel structure is made a call to one or two large through-hole, the auxiliary capacitor sensor is installed again, and must guarantee definitely that storage tank will be non-leakage from now on, it is withstand voltage not influence tank body, and these reality are got up all than difficulty and trouble.
Secondly, more this and two point form is demarcated and must be made the measured object position slowly pass through auxiliary capacitor sensor (capacitance switch is rod extremely), and instrument just may carry out " demarcating certainly "; This will cause: 1, this two class can't be carried out " demarcating certainly " from demarcating electrical capacitance levelmeter fully in many earnest position (liquid level) control occasions that need; 2, auxiliary capacitor sensor (capacitance switch is rod extremely) is installed (being calibration point) position in case select, and can not change, and promptly a normal fluctuation position, thing (liquid) position will be determined in the container, otherwise instrument is difficult to realize " demarcating certainly "; This obviously can not adapt to production line of many enterprises will carry out the needs of many variety production.
In addition, this two class realizes that with auxiliary capacitor sensor (capacitance switch is rod extremely) signal reference point is from demarcating, easy to understand on principle, but when measuring and judging material (liquid), be difficult to realize high-acruracy survey on the quantitative meaning from its auxiliary capacitor sensor (capacitance switch extremely rod) design and this two quasi-instrument of installing analysis, thereby will influence that this two class " fixed-point type is from demarcating capacitive level probe " is demarcated automatically and from the effect and the precision of normal moveout correction by reference point.
Summary of the invention
For overcoming the problems and shortcomings that known capacitance type liquid level tester (meter) and " fixed-point type is from demarcating capacitive level probe " exist, it is a kind of novel from demarcating the formula capacitance type liquid level that the utility model provides, install or during first when fluid to be measured medium in the container (because of composition changes or temperature variation causes) dielectric coefficient change, the utility model need not manually, and (again) participates in demarcating and calibration, just can be with online from the identification automatically in real time of demarcation mode, automatically measure fluid to be measured medium dielectric coefficient, measure automatically, calculate and demonstration, fluid to be measured continually varying liquid level value in the out-put container.
The technical scheme that the utility model solves the problems and shortcomings of known capacitive liquid bit test instrument (meter) and " fixed-point type is from demarcating capacitive level probe " existence is: adopt capacitive transducer design of biliquid position and top mount scheme; Setting up one group on a coaxial circles tubular of known conventional capacitance type liquid level tester (meter) capacitance level transducer basis more promptly increases and leads up to connecting link and directly be placed on the container bottom zone from container top and be immersed in demarcation in the liquid medium all the time with auxiliary capacitor formula survey sensor; This is demarcated and adopts insulation to connect with fixing between capacitive transducer and the connecting link, directly is placed on the container bottom zone from container top, is immersed in the liquid all the time.Sensor two-plate signal lead is the lead of external insulation, draws by connecting link to sensor terminal box.
Because we are designed to the coaxial cylinders shape to the demarcation that increases with auxiliary capacitor formula survey sensor, it is the standardized component that the pole plate area is fixed, the two-plate spacing is fixing, therefore, its capacitance C only changes with the change that is full of fluid to be measured dielectric coefficient between the two-plate.
This any moment of capacitance C of demarcating the auxiliary base capacitance measuring sensor is certainly only depended on this unique variable of dielectric coefficient of fluid to be measured medium.From demarcating the capacitance of auxiliary base capacitance measurement sensing, just can onlinely obtain the current dielectric coefficient of fluid to be measured at any time by real-time measurement; And then immerse the capacitance C that part in liquid is exposed to conventional coaxial circles tubular capacitance level transducer in the gas (being generally air) by measuring another part by instrument, by formula calculate level value by single-chip microcomputer or microprocessor.
The beneficial effects of the utility model are: instrument can regularly be measured as required by program and demarcate the capacitive transducer capacitance, thereby can obtain the dielectric coefficient of fluid to be measured medium at any time exactly, solve fundamentally that present various known capacitance formula liquid level gauge can't obtain the dielectric coefficient of fluid to be measured medium automatically in real time and the problem that influences the level gauging precision greatly; The newly-increased demarcation capacitive transducer of the utility model directly is installed in container bottom zone (mounting hole can not cause fluid seepage), scientific and reasonable, easy construction from container top by the insulating material connecting link.
Description of drawings
Fig. 1 is the utility model scheme of installation
Fig. 2 is the utility model main assembly theory diagram
Among the figure: 1 measures capacitive transducer, 2 demarcates capacitive transducer, 3 connecting links, 4 signal leads, 5 terminal boxes, 6 mounting holes, 7,8 electric capacity freq converting circuits, 9 analog switches, 10 high accuracy frequency measurement circuit, 11 single-chip microcomputers, 12 displays, 13 output circuits, 14 serial communication connection circuits
Embodiment
In Fig. 1, measure capacitive transducer 1 and be adopted as the common mounting means that part immerses fluid to be measured, partly (is generally air dielectric) on liquid level; Demarcate and adopt insulation to connect with fixing between capacitive transducer 2 and the connecting link 3, calibration sensor two-plate signal lead 4 is the lead of external insulation, draws by connecting link to sensor terminal box 5; Calibration sensor directly is placed into the container bottom zone from container top mounting hole 6, adopts the mounting means that all is immersed in all the time in the fluid to be measured; Measure capacitive transducer and demarcate capacitive transducer and all be designed to the coaxial cylinders shape, the structure that the two-plate spacing is fixing.
The signal lead 4 of measuring and demarcate capacitive transducer is linked respectively on separately electric capacity/frequency (being C/f) change-over circuit 7,8, the frequency signal of two C/f change-over circuit outputs by multi-channel analog open 9 select, control enters high accuracy frequency measurement circuit 10.Single-chip microcomputer 11 connects high accuracy frequency measurement circuit 10, display 12, output circuit 13 and serial communication interface circuit 14 and is connected with single-chip microcomputer 11.
Single-chip microcomputer 11 follow procedures are set every interval one minute (can select interval time as required) control analog multichannel switch and are switched to demarcation capacitive transducer passage, once demarcate the capacitive transducer capacitance by the high accuracy frequency measurement circuit measuring, in view of the above, accurately calculate and store (in real time) dielectric coefficient of fluid to be measured according to formula by single-chip microcomputer; Single-chip microcomputer is selected, is controlled multiway analog switch and measures the capacitive transducer capacitance then.And by formula calculate level value.
The utility model has increased demarcates (self calibration) capacitance measuring sensor certainly, adopts Be used in the container top mounting means, do not need to beat installing hole at container side wall, in real reality Existing liquid level has overcome side when automatically measuring, automatically debating knowledge and automatic Calibration and calibration Face is installed difficulty and to the infringement of container.
Claims (2)
1, a kind of novel from demarcating the formula capacitance level gauge, it is characterized in that: measure capacitive transducer (1) and adopt part to immerse fluid to be measured, the common mounting means of part on liquid level; Calibration sensor (2) is placed into the container bottom zone from container top mounting hole (6), adopts the mounting means that all is immersed in all the time in the fluid to be measured; Demarcate and adopt insulation to connect with fixing between capacitive transducer (2) and the connecting link (3), calibration sensor two-plate signal lead (4) is the lead of external insulation, draws by connecting link to sensor terminal box (5).
2, according to claim 1 a kind of novel from demarcating the formula capacitance level gauge, it is characterized in that: the signal lead of measuring capacitive transducer (1) and demarcation capacitive transducer (2) is linked respectively on separately electric capacity/freq converting circuit (7,8), the frequency signal of two change-over circuit outputs enters high accuracy frequency measurement circuit (10) by multiway analog switch (9) selection, control, single-chip microcomputer (11) connects high accuracy frequency measurement circuit (10), and display (12), output circuit (13) and serial communication interface circuit (14) are connected with single-chip microcomputer (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03222606 CN2622681Y (en) | 2003-06-06 | 2003-06-06 | Self-calibration and capacitor type level gage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03222606 CN2622681Y (en) | 2003-06-06 | 2003-06-06 | Self-calibration and capacitor type level gage |
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| Publication Number | Publication Date |
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| CN2622681Y true CN2622681Y (en) | 2004-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03222606 Expired - Fee Related CN2622681Y (en) | 2003-06-06 | 2003-06-06 | Self-calibration and capacitor type level gage |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235904A (en) * | 2010-04-28 | 2011-11-09 | 苏州工业园区易辰电子***有限公司 | Digital calibration liquid level sensing device |
| CN102829841A (en) * | 2012-07-30 | 2012-12-19 | 新会康宇测控仪器仪表工程有限公司 | Capacitance liquid level transmitter |
| CN103197155A (en) * | 2013-04-18 | 2013-07-10 | 苏州赛智达智能科技有限公司 | Method for measuring fully loaded capacitance in LNG (Liquefied Natural Gas) liquid level detector |
| CN103196524A (en) * | 2013-04-18 | 2013-07-10 | 苏州赛智达智能科技有限公司 | Liquid level detecting method for LNG (liquefied natural gas) |
| CN103234598A (en) * | 2013-04-18 | 2013-08-07 | 苏州赛智达智能科技有限公司 | Sensor device for LNG (Liquefied Natural Gas) storage tank |
| CN108204847A (en) * | 2017-12-27 | 2018-06-26 | 中国航发四川燃气涡轮研究院 | A kind of aircraft engine oil liquid level and oil product one measurement sensor and method |
| CN108871498A (en) * | 2018-08-24 | 2018-11-23 | 苏州大学 | Condenser type adaptive universal liquid level emasuring device and method |
| CN111727344A (en) * | 2018-01-19 | 2020-09-29 | 低温科技有限责任公司 | Head for a storage container for liquids |
| CN112050898A (en) * | 2019-06-05 | 2020-12-08 | 深圳优威仪表技术有限公司 | Capacitance type oil level indicator |
| CN112378491A (en) * | 2020-11-13 | 2021-02-19 | 四川泛华航空仪表电器有限公司 | Method for measuring height of oil level of irregular oil tank |
-
2003
- 2003-06-06 CN CN 03222606 patent/CN2622681Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235904A (en) * | 2010-04-28 | 2011-11-09 | 苏州工业园区易辰电子***有限公司 | Digital calibration liquid level sensing device |
| CN102829841B (en) * | 2012-07-30 | 2014-07-30 | 新会康宇测控仪器仪表工程有限公司 | Capacitance liquid level transmitter |
| CN102829841A (en) * | 2012-07-30 | 2012-12-19 | 新会康宇测控仪器仪表工程有限公司 | Capacitance liquid level transmitter |
| CN103197155B (en) * | 2013-04-18 | 2015-10-28 | 苏州赛智达智能科技有限公司 | The method of fully loaded electric capacity is detected in LNG Level meter |
| CN103234598A (en) * | 2013-04-18 | 2013-08-07 | 苏州赛智达智能科技有限公司 | Sensor device for LNG (Liquefied Natural Gas) storage tank |
| CN103196524A (en) * | 2013-04-18 | 2013-07-10 | 苏州赛智达智能科技有限公司 | Liquid level detecting method for LNG (liquefied natural gas) |
| CN103197155A (en) * | 2013-04-18 | 2013-07-10 | 苏州赛智达智能科技有限公司 | Method for measuring fully loaded capacitance in LNG (Liquefied Natural Gas) liquid level detector |
| CN103196524B (en) * | 2013-04-18 | 2015-10-28 | 苏州赛智达智能科技有限公司 | A kind of method of accurate detection LNG liquid level |
| CN108204847A (en) * | 2017-12-27 | 2018-06-26 | 中国航发四川燃气涡轮研究院 | A kind of aircraft engine oil liquid level and oil product one measurement sensor and method |
| CN108204847B (en) * | 2017-12-27 | 2020-04-07 | 中国航发四川燃气涡轮研究院 | Aero-engine lubricating oil liquid level and oil product integrated measurement sensor and method |
| CN111727344A (en) * | 2018-01-19 | 2020-09-29 | 低温科技有限责任公司 | Head for a storage container for liquids |
| CN108871498A (en) * | 2018-08-24 | 2018-11-23 | 苏州大学 | Condenser type adaptive universal liquid level emasuring device and method |
| CN112050898A (en) * | 2019-06-05 | 2020-12-08 | 深圳优威仪表技术有限公司 | Capacitance type oil level indicator |
| CN112378491A (en) * | 2020-11-13 | 2021-02-19 | 四川泛华航空仪表电器有限公司 | Method for measuring height of oil level of irregular oil tank |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |