CN101532863A - Radio frequency induction lamination level sensor - Google Patents
Radio frequency induction lamination level sensor Download PDFInfo
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- CN101532863A CN101532863A CN200910020466A CN200910020466A CN101532863A CN 101532863 A CN101532863 A CN 101532863A CN 200910020466 A CN200910020466 A CN 200910020466A CN 200910020466 A CN200910020466 A CN 200910020466A CN 101532863 A CN101532863 A CN 101532863A
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Abstract
The invention relates to a radio frequency induction lamination level sensor, belongs to the filed of detecting devices, and aims to provide a sensor. The sensor can delaminate a medium to be detected infinitely and have a panoramic view of the distribution situation of dielectric layers to be detected so as to completely eliminate measuring blind areas and greatly improve the measuring accuracy, can accurately measure the interface of two liquid media with different specific inductive capacities or the interface of a gas and a liquid, also can accurately measure oil-gas interface, oil-emulsified layer interface and water-emulsified layer interface, and can perform full-range and high-precision measurement on the thicknesses of an oil layer, an emulsified layer and sewage in a crude oil storage tank. The sensor is provided with a radio frequency transducer and a measuring pole, and is characterized in that a columnar or tubular insulator supports the inside of the measuring pole; and electrodes which are insulated mutually and have the same shape and size are laminated and arrayed on the outer side of the columnar or tubular insulator at equal intervals; each electrode is electrically connected with the radio frequency transducer through a shielded cable respectively; and the outer layer of the measuring electrodes is provided with an insulated sleeve.
Description
Technical field
The present invention relates to a kind of measurement mechanism, not only be applicable to single medium level gauging but also be applicable to the different medium level gauging, especially can distribute with height and water percentage and carry out the level transducer that gamut detects crude oil storage tank oil-aerosphere face, oil-emulsion layer interface, water-emulsion layer interface location and core intersection, emulsion layer thickness, sewage thickness.
Background technology
As everyone knows, when petroleum refining, adopt the electro-desalting mode to carry out Desalting and Dewatering from Crude Oil usually.And crude oil electric desalting technology, mainly be purify waste water by in crude oil, adding, emulsion breaker, at the emulsified state of mode breaking emulsification of crude oil things such as high temperature, high pressure.Under the effect of high-voltage electric field, small water droplet is agglomerated into big water droplet in the crude oil, makes oil and water separation, and this must form and occur crude oil, emulsion layer, the mixed state of depositing of sewage in the electrical oil dewatering jar.
In the oil refining production run, water-oil interface position height and emulsion layer thickness are the important operation parameters of electro-desalting in the electrical desalter, and catalyzer service efficiency and the equipment corrosion degree of controlling dehydration of crude oil desalination degree, dosing (emulsion breaker) amount, high-voltage electric field voltage and power and even subsequent production process is significant.Grasp parameter indexs such as the interior core intersection of crude oil storage tank, emulsion layer thickness, sewage highly in the oil recovery production run, for instructing produced on-site such as outer output oil, control dosing (emulsion breaker) amount to have vital role with dosing (emulsion breaker) time, sewage effluent, a jar interior desilting.If wonder the thickness of jar interior different medium, must grasp the clear interface location of various different mediums.
The interface instrument of oil refining production application on electrical desalter is by resistance-type, condenser type, interior heavy cartridge type, differential pressure type and admitthance liquid level gauge at present.These liquid level gauges all are single measurement, the height of energy measurement water outlet only, and for a long time, generally believe the emulsion layer that has certain altitude in electrical desalter, how many height of this emulsion layer is specially, and do not determine always, though recommended the height of some emulsion layers, but the variation of oil property, the height of emulsion layer are also changing at any time, and these instrument lack real directive significance aspect breaking emulsion and dewatering.
And the situation that this kind profit mixes is present in the oil extraction process too.The oil production technology in oil field mainly refers to extract crude oil or wet oil from oil well,,, imports each crude oil storage tank and carries out outer defeated after technologies such as impurity elimination, breakdown of emulsion, dehydration to multi-purpose station by pumping plant and pipeline transportation.Because the effect of artificial emulsifying agent is added in naturally occurring emulsifying agent such as the colloid that contains in the crude oil itself, bituminous matter and secondary oil recovery, tertiary oil recovery, the violent disturbance of crude oil in exploitation and course of conveying simultaneously, emulsifying agent in the crude oil accumulates in the firm molecular film of composition on the water-oil interface by suction-operated, water is dispersed in the crude oil with micro-droplet status, forms stable emulsion.Because the character of crude oil, medicament influence and breaking emulsion and dewatering technology are not thorough, even also can occur crude oil, emulsion layer, the mixed phenomenon of depositing of sewage in the finished product crude oil storage tank, even a large amount of mud can also be gathered in a jar end.This situation is more outstanding in slurry tank and other transfer oil tanks.The production scene understanding jar most of method that interior situation is taked of recovering the oil for a long time is a hand gauging, be the dip hatch of survey crew from the crude oil storage tank top, hang one with rope and can under pasta, control the gauging bucket that opens and closes, go deep under the liquid level respectively at different depth, extract crude oil, moisture roily oil, oily sewage, after using instrumental analysis, and then the internal state of judgement crude oil storage tank.This method not only labour intensity is big dangerous high, and can not carry out the measurement of gamut to the internal state of crude oil storage tank, thereby grasps a jar interior real conditions.Since the nearly more than ten years, someone utilizes various surveying instrument instrument that the hand gauging trial property of crude oil storage tank is substituted, as ultrasonic type, radar type, radio frequency admittance formula, capacitance-grid type, magnetostriction type even radioelement method, but because actual production process is a dynamic process, the water percentage difference of the character of crude oil extraction, wet oil, the variation of temperature, pressure, flow, and the influence of factor such as liquid level oil gas volatilization, liquid surface fluctuation all do not obtain good result.
Patent US005103368A discloses a kind of level sensor, only can measure the well behaved single product oil that flows, and during to multiple Medium Measurement, short circuit easily between the electrode, and can't carry out the measurement of interface and thickness to wet oil, oily sewage.The pick-up unit of a CN2341131Y crude oil storage tank only can be measured by water-oil interface, can not measure by gamut, and manipulates inconvenience, and practicality is relatively poor.More than two kinds of devices the two poles of the earth of being used for capacitive transducer provide by self, electrode distance is little, be subject to wax deposition, bridging influence, and range is less.The disclosed heterogeneous level transducer of CN1207540C is the FR sensor of a kind of leggy, and gamut is measured continuously, but the easy temperature influence of the built-in device of sensor electrode is difficult for being applicable to the high temperature occasion.
Summary of the invention
In order to overcome the technical deficiency that existing level sensor can not be measured heterogeneous thing position, the invention provides a kind of radio frequency induction lamination level sensor, the mutually equidistant stacked arrangement of this sensor electrode, can be with the unlimited layering of measured medium, measured medium layer distribution situation covers all at one glance, thoroughly eliminate and measure the blind area, measuring accuracy improves greatly.Each all electrodes all can become the main measurement utmost point respectively separately, and the every path electrode that couples together all can carry out the gamut measurement separately.Can accurately measure interface or the gas and the liquid surface of two kinds of different liquid mediums of specific inductive capacity, oil-aerosphere face, oil-emulsion layer interface, water-emulsion layer interface be can also accurately measure, and can gamut, high-precision measurement be all made the core intersection in the crude oil storage tank, emulsion layer thickness, sewage thickness.
The technical solution adopted for the present invention to solve the technical problems is: a kind of radio frequency induction lamination level sensor, be provided with the radio frequency transmitter, measure the utmost point, support by column or tubular insulator in it is characterized in that measuring extremely, equidistant lamination lays and is arranged with mutual insulating, shape and measure-alike electrode on column or the tubular insulator lateral surface, each electrode is realized being electrically connected through shielded cable and radio frequency transmitter respectively, and the potential electrode skin is an insulating sleeve.
The present invention also can realize by following measure: column or tubular insulator are rigid body or flexible body.Electrode lays arrangement along the vertically equidistant lamination of insulator axis direction.Vertically the equidistant lamination of ascending manner is staggered in the shape of a spiral lays arrangement along the insulator axis direction for electrode.Electrode lays arrangement along the equidistant lamination of the vertical single channel of insulator axis direction.Electrode lays arrangement along the equidistant lamination of the vertical multichannel of insulator axis direction.Insulating sleeve is set with the metal pipe type subsidiary utmost point outward, be cavity between the metal tube madial wall of the subsidiary utmost point and the insulating coating, evenly processing is porose on the metal tube tube wall of the subsidiary utmost point, and the flange of subsidiary utmost point upper end is connected with the flange of radio frequency transmitter.
The invention has the beneficial effects as follows, can be with the unlimited layering of measured medium, measured medium layer distribution situation covers all at one glance, and thoroughly eliminates and measures the blind area, and measuring accuracy improves greatly.Each all electrodes all can become the main measurement utmost point respectively separately, and the every path electrode that couples together all can carry out the gamut measurement separately.Can accurately measure interface or the gas and the liquid surface of two kinds of different liquid mediums of specific inductive capacity, oil-aerosphere face, oil-emulsion layer interface, water-emulsion layer interface be can also accurately measure, and can gamut, high-precision measurement be all made the core intersection in the crude oil storage tank, emulsion layer thickness, sewage thickness.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the one-piece construction synoptic diagram of band part sectioned view of the present invention.
Fig. 2 lays the arrangement mode synoptic diagram for electrode single channel equidistance of the present invention.
Fig. 2-the 1st, the front view of Fig. 2.
Fig. 2-the 2nd, the left view of Fig. 2.
Fig. 2-the 3rd, the vertical view of Fig. 2.
Fig. 3-1 is that the electrode two-way of column equidistantly lays the arrangement mode structural representation for insulator of the present invention.
Fig. 3-the 11st, the front view of Fig. 3-1.
Fig. 3-the 12nd, the left view of Fig. 3-1.
Fig. 3-the 13rd, the vertical view of Fig. 3-1.
Fig. 3-2 is that the electrode two-way of tubulose equidistantly lays the arrangement mode structural representation for insulator of the present invention.
Fig. 3-the 21st, the front view of Fig. 3-2.
Fig. 3-the 22nd, the left view of Fig. 3-2.
Fig. 3-the 23rd, the vertical view of Fig. 3-2.
Fig. 4-1 is that the electrode three tunnel of column equidistantly lays the arrangement mode structural representation for insulator of the present invention.
Fig. 4-the 11st, the front view of Fig. 4-1.
Fig. 4-the 12nd, the left view of Fig. 4-1.
Fig. 4-the 13rd, the vertical view of Fig. 4-1.
Fig. 4-2 is that the electrode three tunnel of tubulose equidistantly lays the arrangement mode structural representation for insulator of the present invention.
Fig. 4-the 21st, the front view of Fig. 4-2.
Fig. 4-the 22nd, the left view of Fig. 4-2.
Fig. 4-the 23rd, the vertical view of Fig. 4-2.
Fig. 5-1 is that the electrode four tunnel of column equidistantly lays the arrangement mode structural representation for insulator of the present invention.
Fig. 5-the 11st, the front view of Fig. 5-1.
Fig. 5-the 12nd, the rear view of Fig. 5-1.
Fig. 5-the 13rd, the vertical view of Fig. 5-1.
Fig. 5-2 is that the electrode four tunnel of tubulose equidistantly lays the arrangement mode structural representation for insulator of the present invention.
Fig. 5-the 21st, the front view of Fig. 5-2.
Fig. 5-the 22nd, the rear view of Fig. 5-2.
Fig. 5-the 23rd, the vertical view of Fig. 5-2.
Fig. 6-1 is the local longitudinal sectional drawing of column for insulator in the embodiment of the invention two.
Fig. 6-the 11st, the vertical view of Fig. 6-1.
Fig. 6-2 is the local longitudinal sectional drawing of tubulose for insulator in the embodiment of the invention two.
Fig. 6-the 21st, the vertical view of Fig. 6-2.
Fig. 7-1 is the local longitudinal sectional drawing of column for insulator in the embodiment of the invention three.
Fig. 7-the 11st, the vertical view of Fig. 7-1.
Fig. 7-2 is the local longitudinal sectional drawing of tubulose for insulator in the embodiment of the invention three.
Fig. 7-the 21st, the vertical view of Fig. 7-2.
Fig. 8-1 is the local longitudinal sectional drawing of column for insulator in the embodiment of the invention four.
Fig. 8-the 11st, the vertical view of Fig. 8-1.
Fig. 8-2 is the local longitudinal sectional drawing of tubulose for insulator in the embodiment of the invention four.
Fig. 8-the 21st, the vertical view of Fig. 8-2.
Fig. 9 is the structural representation of the band subsidiary utmost point of the present invention.
Figure 10 is the schematic diagram of testing circuit of the present invention.
1. radio frequency transmitters among the figure, 2. ring flange, 3. electrode, 4. insulator, 5. insulating sleeve 6. seals hammer, 7. through hole, 8. wiring duct, 9. pore, 10. shielded cable, 11. wireropes, 12. the subsidiary utmost point, A1. electrode, A2. electrode, B1. electrode, B2. electrode, C1. electrode, C2. electrode, D1. electrode, D2. electrode.
Embodiment
As Fig. 1, Fig. 2, Fig. 2-1, Fig. 2-2, shown in Fig. 2-3, in measuring extremely, supports present embodiment by column insulator 4, column insulator 4 is rigid body or flexible body, equidistant lamination lays and is arranged with the single channel mutual insulating on column insulator 4 lateral surfaces, shape and measure-alike electrode 3, cover is put into insulating sleeve 5 behind the outer brushing insulating gel of potential electrode, insulating sleeve 5 upper end mounting flanges 2, the lower end connects sealing hammer 6, each electrode 3 is connected with a shielded cable 10 respectively, electrode 3 is an arcuate structure, adopt the sheet metal of double-sided insulation to make, be processed with wiring duct 8 on the column insulator 4 at arcuate structure electrode 3 aperture position places, all shielded cables 10 embed wiring duct 8, and are electrically connected with radio frequency transmitter 1 by ring flange 2.
As Fig. 1, Fig. 3-1, Fig. 3-11, Fig. 3-12, Fig. 3-13, Fig. 6-1, shown in Fig. 6-11, in measuring extremely, supports present embodiment by column insulator 4, column insulator 4 is rigid body or flexible body, electrode 3 180 degree angles at interval divides two curb column insulators, 4 axis vertically equidistantly to lay arrangement, two electrode 3 shapes and measure-alike that every road is adjacent, mutual insulating, equidistant lamination lays arrangement, electrode 3 is an arcuate structure, adopt the sheet metal of double-sided insulation to make, cover is put into insulating sleeve 5 behind the outer brushing insulating gel of potential electrode, insulating sleeve 5 upper end mounting flanges 2, the lower end connects sealing hammer 6, each electrode 3 is connected with a shielded cable 10 respectively, be processed with wiring duct 8 on the column insulator 4 between adjacent two path electrodes 3, all shielded cables 10 embed wiring duct 8, and are electrically connected with radio frequency transmitter 1 by ring flange 2.
Embodiment 3:
As Fig. 1, Fig. 4-1, Fig. 4-11, Fig. 4-12, Fig. 4-13, Fig. 7-1, shown in Fig. 7-11, in measuring extremely, supports present embodiment by column insulator 4, column insulator 4 is rigid body or flexible body, electrode 3 120 degree angles at interval divides three curb column insulators, 4 axis vertically equidistantly to lay arrangement, two electrode 3 shapes and measure-alike that every road is adjacent, mutual insulating, equidistant lamination lays arrangement, electrode 3 is an arcuate structure, adopt the sheet metal of double-sided insulation to make, cover is put into insulating sleeve 5 behind the outer brushing insulating gel of potential electrode, insulating sleeve 5 upper end mounting flanges 2, the lower end connects sealing hammer 6, each electrode 3 is connected with a shielded cable 10 respectively, be processed with wiring duct 8 on the column insulator 4 between adjacent two path electrodes 3, all shielded cables 10 embed wiring duct 8, and are electrically connected with radio frequency transmitter 1 by ring flange 2.
As Fig. 1, Fig. 5-1, Fig. 5-11, Fig. 5-12, Fig. 5-13, Fig. 8-1, shown in Fig. 8-11, in measuring extremely, supports present embodiment by column insulator 4, column insulator 4 is rigid body or flexible body, electrode 3 an angle of 90 degrees at interval divides four curb column insulators, 4 axis vertically equidistantly to lay arrangement, two electrode 3 shapes and measure-alike that every road is adjacent, mutual insulating, equidistant lamination lays arrangement, electrode 3 is an arcuate structure, adopt the sheet metal of double-sided insulation to make, cover is put into insulating sleeve 5 behind the outer brushing insulating gel of potential electrode, insulating sleeve 5 upper end mounting flanges 2, the lower end connects sealing hammer 6, each electrode 3 is connected with a shielded cable 10 respectively, be processed with wiring duct 8 on the column insulator 4 between adjacent two path electrodes 3, all shielded cables 10 embed wiring duct 8, and are electrically connected with radio frequency transmitter 1 by ring flange 2.
As shown in Figure 9, when the present invention measures the medium in the irregular container if desired, outside insulating sleeve 5, be set with the metal pipe type subsidiary utmost point 12, be cavity between the metal tube madial wall of the subsidiary utmost point 12 and the insulating coating 5, evenly be processed with energy through hole 7 on the metal tube tube wall of the subsidiary utmost point 12, measured medium via through holes 7 enters in the cavity between metal tube madial wall and the insulating coating 5, and the flange of the subsidiary utmost point 12 upper ends is connected with the ring flange 2 of radio frequency transmitter 1.
As shown in figure 10, testing circuit mainly is made up of unit such as controllable signal source, lamination level sensor, signal processing circuit, telecommunication circuit, power circuit, man-machine interfaces.Controllable signal source: adopt professional integrated circuit, the square-wave signal of variable cycle or the square-wave signal of fixed cycle are provided.Realize cycle, the amplitude in Based Intelligent Control controllable signal source, the angle that shakes, waveform etc. by signal processing circuit.Signal processing circuit: form (as amplitude amplifying circuit, cycle screening circuit, useful work idle work separation circuit, single-chip microcomputer automatic range translation circuit) by a plurality of signal processing units.Can carry out intelligence, omnibearing measurement according to cycle, amplitude, the angle etc. that shakes in the signal intelligent conditioning signal source of electrode feedback.Telecommunication circuit:, can adopt multiple communication modes such as RS232, RS485, CANBUS, 4～20mA, HART, USB, LAN according to the customer demand design.Power circuit: adopt professional integrated circuit to form, can provide many group voltage signals to signal processing circuit, signal source circuit, telecommunication circuit.For improving power work efficient, the design adopts the small and exquisite switching power circuit of volume, and work efficiency can reach 90%.Man-machine interface: man-machine interface can satisfy different customer demands, provide multiple well, operator scheme intuitively, as infrared manual operator.And the whole detection system realizes the electrical isolation of safety zone and explosion-proof area by safety barrier.Usually adopt the isolating safety grid of specialty.Utilize industrial computer or concentrator to realize the field data collection.Can provide relevant industry control assembly and configuration software according to customer requirements.Also can be DCS related data interface signal (as current signal, fieldbus signal, sound and light alarm signal etc.) is provided.
The principle of work of above-mentioned four embodiment and testing circuit is: signal processing circuit control controllable signal source, alternately send radiofrequency signal, respectively with measure the electrode 3 extremely go up and connect, connection was A1, A2, A3 in proper order when electrode 3 single channel were arranged ... connection was A1, B1, A2, B2 in proper order when electrode two row were arranged ... connection was A1, B1, C1, A2, B2, C2 in proper order when electrode three tunnel was arranged ..., connection was A1, B1, C1, D1, A2, B2, C2, D2 in proper order when electrode four tunnel was arranged ...Electrode of every connection, other electrodes are in off state, after each electrode is connected, each electrode measured value is passed signal processing circuit analysis back through telecommunication circuit, store, after all electrodes are connected one by one, signal processing circuit focuses on whole each signal of whole circulation, isolate the amplitude of each electrode, cycle, the angle shakes, data after the processing are analysed and compared in order by application software, thereby the dielectric property of judging electrode obtains the distributed data of medium, above-mentioned is the course of work of single working cycle, and practical work process is a course of work that successively repeats single working cycle.Every path electrode that single channel couples together among above-mentioned three embodiment all can carry out gamut separately and measure.
Claims (7)
1, a kind of radio frequency induction lamination level sensor, be provided with the radio frequency transmitter, measure the utmost point, it is characterized in that: support by column or tubular insulator in measuring extremely, equidistant lamination lays and is arranged with mutual insulating, shape and measure-alike electrode on column or the tubular insulator lateral surface, each electrode is realized being electrically connected through shielded cable and radio frequency transmitter respectively, and the potential electrode skin is an insulating sleeve.
2, according to the described radio frequency induction lamination level sensor of claim 1, its feature is rigid body or flexible body in said column or tubular insulator.
3, according to the described radio frequency induction lamination level sensor of claim 1, its feature is laid arrangement at said electrode along the vertically equidistant lamination of insulator axis direction.
4, according to the described radio frequency induction lamination level sensor of claim 1, vertically the equidistant lamination of ascending manner is staggered in the shape of a spiral lays arrangement along the insulator axis direction at said electrode for its feature.
5, according to the described radio frequency induction lamination level sensor of claim 1, its feature is laid arrangement at said electrode along the equidistant lamination of the vertical single channel of insulator axis direction.
6, according to the described radio frequency induction lamination level sensor of claim 1, its feature is laid arrangement at said electrode along the equidistant lamination of the vertical multichannel of insulator axis direction.
7, according to the described radio frequency induction lamination level sensor of claim 1, its feature is set with the metal pipe type subsidiary utmost point outside said insulating sleeve, be cavity between the metal tube madial wall of the subsidiary utmost point and the insulating coating, evenly processing is porose on the metal tube tube wall of the subsidiary utmost point, and the flange of subsidiary utmost point upper end is connected with the flange of radio frequency transmitter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910020466A CN101532863A (en) | 2009-04-04 | 2009-04-04 | Radio frequency induction lamination level sensor |
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| CN200910020466A CN101532863A (en) | 2009-04-04 | 2009-04-04 | Radio frequency induction lamination level sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928050A (en) * | 2012-10-24 | 2013-02-13 | 朱更君 | Multi-section admittance liquid level interfacial measuring instrument without unmeasurable area |
| CN102959391A (en) * | 2011-03-28 | 2013-03-06 | 威海海和科技有限责任公司 | Electrode structure and apparatus for use in measuring oil-water constituents |
| GB2501165A (en) * | 2012-02-24 | 2013-10-16 | Mobrey Ltd | Interface detection using a vertical array of time domain reflectometry sensors |
| CN104930961A (en) * | 2015-06-03 | 2015-09-23 | 大连海事大学 | Liquid cabinet oil layer thickness detection apparatus and measuring method thereof |
| CN106643977A (en) * | 2016-11-10 | 2017-05-10 | 东北农业大学 | Portable semi-automatic water level probe |
| CN111780828A (en) * | 2020-06-18 | 2020-10-16 | 东风汽车集团有限公司 | Method for calculating actual fuel percentage of fuel tank |
| CN117434116A (en) * | 2023-12-01 | 2024-01-23 | 中国核电工程有限公司 | Interface dirt continuous measurement system and measurement method |
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2009
- 2009-04-04 CN CN200910020466A patent/CN101532863A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102959391A (en) * | 2011-03-28 | 2013-03-06 | 威海海和科技有限责任公司 | Electrode structure and apparatus for use in measuring oil-water constituents |
| CN102959391B (en) * | 2011-03-28 | 2014-10-29 | 威海海和科技有限责任公司 | Electrode structure and apparatus for use in measuring oil-water constituents |
| US9395349B2 (en) | 2011-03-28 | 2016-07-19 | Weihai Haiher Technology Co. | Electrode structure and apparatus for use in measuring oil-water constituents |
| GB2501165A (en) * | 2012-02-24 | 2013-10-16 | Mobrey Ltd | Interface detection using a vertical array of time domain reflectometry sensors |
| GB2501165B (en) * | 2012-02-24 | 2020-03-04 | Rosemount Measurement Ltd | Interface detection using a vertical array of time domain reflectometry sensors |
| CN102928050A (en) * | 2012-10-24 | 2013-02-13 | 朱更君 | Multi-section admittance liquid level interfacial measuring instrument without unmeasurable area |
| CN104930961A (en) * | 2015-06-03 | 2015-09-23 | 大连海事大学 | Liquid cabinet oil layer thickness detection apparatus and measuring method thereof |
| CN106643977A (en) * | 2016-11-10 | 2017-05-10 | 东北农业大学 | Portable semi-automatic water level probe |
| CN111780828A (en) * | 2020-06-18 | 2020-10-16 | 东风汽车集团有限公司 | Method for calculating actual fuel percentage of fuel tank |
| CN111780828B (en) * | 2020-06-18 | 2021-06-04 | 东风汽车集团有限公司 | Method for calculating actual fuel percentage of fuel tank |
| CN117434116A (en) * | 2023-12-01 | 2024-01-23 | 中国核电工程有限公司 | Interface dirt continuous measurement system and measurement method |
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Application publication date: 20090916 |