CN202057392U - Complex sensor - Google Patents
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- CN202057392U CN202057392U CN2011201469352U CN201120146935U CN202057392U CN 202057392 U CN202057392 U CN 202057392U CN 2011201469352 U CN2011201469352 U CN 2011201469352U CN 201120146935 U CN201120146935 U CN 201120146935U CN 202057392 U CN202057392 U CN 202057392U
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- float
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Abstract
A complex sensor comprises a measuring bar, an electronic bin, a liquid level floater, a density floater, and a temperature sensor, wherein the measuring bar comprises a hollow outer tube with a sealed bottom end, a waveguide filament is arranged in the outer tube, and a protective sleeve for protecting the waveguide filament from being damaged is arranged outside the waveguide filament; the electronic bin is connected with one end of the measuring bar; a permanent magnetic ring is fixed inside the liquid level floater which is freely sheathed on the outer tube of the measuring bar; the density floater is arranged below the liquid level floater, internally and fixedly provided with a permanent magnetic ring, and is freely sheathed on the outer tube of the measuring bar; and the temperature sensor is arranged in the measuring bar and on the protective sleeve, and is electrically connected with the electronic bin. The complex sensor can realize online measurement on multiple parameters (liquid level, density and temperature) of liquid with a low cost, high precision and high resolution, and not only can be used in gasoline stations and petrochemical industry, but also can be applied in industries such as medicine, food and beverage processing and the like.
Description
Technical field
The utility model relates to liquid multiparameter detection range, particularly a kind of high-precision compound sensor that is used for online tracer liquid (as oil product) liquid level, density and temperature.
Background technology
In product oil transportation circulation industry, run, drip, leak, situation such as steal happen occasionally, and have caused very big economic loss to associated companies.For the people who reduces in the transportation is loss, monitor oil quality and quantity in real time, urgent need is installed sensor special and vehicle-mounted monitoring system on tank wagon, online detection oil product liquid level, density and temperature, timely deal with data, thereby effectively monitor the variation of oil product total amount in the transportation, abnormal conditions are reported to the police, strengthen the supervision of oil product transportation.
The level gauging technology is comparatively ripe at present, is applicable to mainly containing of oil product high-acruracy survey: magnetostriction liquidometer, servo-type level meter, radar level gauge etc.Radar level gauge can only be measured single liquid level, and not energy measurement interface and temperature more can't density measurements.Servo-type level meter can measuring liquid level, density and temperature, and measuring accuracy is higher, but it is based on the servo-type Principle of Electric Engine, belong to machinery, electronics association class product, debugging is installed complicated, and price is high, be mainly used in big reservoir area larger storage tank, and be not suitable for vehicle-mounted small-sized oil tank measurement.Magnetostriction liquidometer belongs to float type level gauge, is applicable to the low-viscosity (mobile) liquid measurement, can measure liquid level, interface and temperature simultaneously, and it is lower to compare equal accuracy liquid level gauge price.Also there are many shaped articles the density measure aspect, and common is static pressure type and type vibration wire on-line densimeter, and density measurement accuracy can reach 0.001g/cm3, but only energy measurement density and temperature, measuring liquid level simultaneously.
The patent No. is " ZL03212246 ", name is called the disclosed liquid level of Chinese utility model patent, density, the temperature sensor of " liquid level, density, temperature sensor ", by density float and the fly rod component density measuring sensor that is fixed together, density float is the magnetic float of hollow ball shape, and fly rod is binary fly rod or cylindroid fly rod.The center of gravity of the density measure element of this structure is higher than its centre of buoyancy most probably, makes it to keep the vertical equilibrium state of nature in liquid, produces friction force on the measuring staff with it thereby incline to leaning against, and has a strong impact on density measurement accuracy.In addition, just how not provide related data according to float distance computation density.
Application number is " 00105004 ", name is called the measuring instrument of the disclosed liquid level of Chinese invention patent application, density and the quality of " measuring instrument of liquid level, density and quality ", by cylindrical density float and the common component density measuring sensor of balance pipe, by the distance computation fluid density of density measurement float and liquid level float.Structurally there are the problems referred to above equally in this application.Simultaneously, its disclosed density calculation formula is: P
t=P
0+ Δ t
2* V * K, wherein P
tBe transient liquid density value, P
0Fluid density value when being in zero point for density float, Δ t
2Should be liquid surface float and density float and return the mistiming of pulse, the speed that V propagates for the pulse edge waveguide, K is the density conversion coefficient.This formula thinks that the variation of fluid density and float spacing is linear proportional relation.And in fact, according to Archimedes principle, F
Floating=ρ
LiquidGV
Row(h), wherein, F
FloatingBe the suffered buoyancy of float, ρ
LiquidBe fluid density, g is a gravity constant.V
Row(h) volume of the liquid that arranges for float is the function of float submergence h, and h is approximately equal to the separation delta t of liquid level float and density float
2* V.Obviously, the variation of fluid density and float spacing be approximate inverse relation (because of liquid level float submergence equally with liquid density variation, so only for approximate), only depend on a simple COEFFICIENT K to calculate instantaneous density, its relation is defaulted as linear direct ratio, tangible nonlinearity erron will be caused, high-acruracy survey can't be guaranteed.
In addition, the patent No. is " ZL201020171364.3 ", and name is called the Chinese utility model patent of " digital magnetostrictive liquid level sensor ", and only energy measurement liquid level and temperature can't be measured density of liquid simultaneously.Therefore, based on liquid level, density and the thermometry of magnetostriction principle, aspect structural design and density calculation, all come with some shortcomings in the prior art, be unfavorable for realizing high-precision liquid level, density and temperature survey.
The utility model content
Technical problem to be solved in the utility model provides high-precision, the combined type trans of online tracer liquid liquid level, density and temperature simultaneously of a kind of high resolving power.
To achieve these goals, the utility model provides a kind of compound sensor, wherein, comprising:
One measuring staff comprises the hollow outer tube of bottom end seal in the described outer tube waveguide filament being arranged, and described waveguide filament is outside equipped with and is used to the protective casing of protecting this waveguide filament not to be damaged;
One electronics storehouse is connected with an end of described measuring staff;
One liquid level float, its internal fixation have a permanent magnet ring, and described liquid level float freedom suit is on the outer tube of described measuring staff;
One density float is arranged at described liquid level float below, and its internal fixation has a permanent magnet ring, and described density float freedom suit is on the outer tube of described measuring staff;
One temperature sensor is arranged in the described measuring staff and is installed on the described protective casing, electrically connects with described electronics storehouse.
Above-mentioned compound sensor, wherein, described density float comprises:
Floating drum, described floating drum internal fixation has permanent magnet ring;
Be used to regulate the balancing weight of the proportion of described density float, described balancing weight is connected described floating drum below;
Be used to avoid the density measuring staff of interfering with described liquid level float, be connected with described floating drum top, described liquid level float is arranged in the stroke range of described density measuring staff.
Above-mentioned compound sensor, wherein, described density measuring staff is at least two thin-wall circular tubes, described thin-wall circular tube interfixes by support and is connected on the described floating drum.
Above-mentioned compound sensor, wherein, described density measuring staff is three sealed at both ends thin-wall circular tubes.
Above-mentioned compound sensor, wherein, described three thin-wall circular tube two ends interfix by described support respectively, and wherein an end is connected on the described floating drum by described support.
Above-mentioned compound sensor, wherein, described floating drum is a stainless steel elongated cylindrical hollow-core construction.
Above-mentioned compound sensor, wherein, described floating drum is a plantation rubber cylindricality solid construction.
Above-mentioned compound sensor, wherein, described electronics storehouse comprises:
One sensitive element head electrically connects with described waveguide filament;
One circuit board comprises:
One exciting circuit electrically connects with described waveguide filament;
One signal processing circuit electrically connects with described sensitive element head;
One time measurement circuit is connected with described signal processing circuit;
One single-chip microcomputer electrically connects with described time measuring circuit, described exciting circuit and described temperature sensor respectively;
One telecommunication circuit electrically connects with described single-chip microcomputer.
Above-mentioned compound sensor wherein, comprises that also one is used to the snap ring that prevents that described liquid level float and described density float from coming off from described outer tube, and described snap ring is fixed on the bottom of described outer tube.
Beneficial functional of the present utility model is: can realize on-line measurement low-cost, high-accuracy high-resolution to the multiple parameters (liquid level, density and temperature) of liquid, also can further calculate liquid volume and quality by host computer in conjunction with the tank volume table.Not only can be used for refuelling station, petroleum chemical industry, nontoxic owing to its stainless steel outer tube, float all adopt stainless steel material, also can be applicable to industries such as medicine, food and drink processing.
Below in conjunction with the drawings and specific embodiments the utility model is described in detail, but not as to qualification of the present utility model.
Description of drawings
Fig. 1 is the structural representation of the utility model one embodiment;
Fig. 2 is the A-A cross-sectional schematic of Fig. 1;
Fig. 3 is the density float structural representation of the utility model one embodiment;
Fig. 4 is the structural representation of another embodiment of the utility model;
Fig. 5 is the circuit module work wave synoptic diagram of the utility model one embodiment;
Fig. 6 is the principle of work block diagram of the utility model one embodiment.
Wherein, Reference numeral
1 measuring staff, 11 waveguide filaments
12 protective casings, 13 outer tubes
2 electronics storehouses, 21 sensitive element heads
22 circuit boards, 221 signal processing circuits
222 exciting circuits, 223 time measuring circuits
224 telecommunication circuits, 225 single-chip microcomputers
3 liquid level floats, 4 density float
41 density measuring staffs, 42 floating drums
43 balancing weights, 44 supports
45 screws, 5 temperature sensors
6 output cables and joint 7 snap rings
8 host computer M driving pulses
A echo 1 B echo 2
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and principle of work are done concrete description:
Referring to Fig. 1, Fig. 2 and Fig. 4, Fig. 1 is the structural representation of the utility model one embodiment, and Fig. 2 is the A-A cross-sectional schematic of Fig. 1, and Fig. 4 is the structural representation of another embodiment of the utility model.Compound sensor of the present utility model, comprise: measuring staff 1, this measuring staff 1 comprises the hollow outer tube 13 of bottom end seal, this outer tube 13 is preferably the stainless steel materials and parts, in the described outer tube 13 waveguide filament 11 is arranged, waveguide filament 11 is a sensitive element, and described waveguide filament 11 is outside equipped with and is used to the protective casing 12 of protecting this waveguide filament 11 not to be damaged; Electronics storehouse 2 is connected with an end of described measuring staff 1, and the top in this electronics storehouse 2 is equipped with output cable and joint 6; Liquid level float 3, liquid level float 3 is preferably the stainless steel hollow float, and its internal fixation has a permanent magnet ring, and described liquid level float 3 freedom suits are on the outer tube 13 of described measuring staff 1; Density float 4 is arranged at described liquid level float 3 belows, and its internal fixation has a permanent magnet ring, and described density float 4 freedom suits are on the outer tube 13 of described measuring staff 1; Temperature sensor 5 is arranged in the described measuring staff 1 and is installed on the described protective casing 12, electrically connects with described electronics storehouse 2.In the present embodiment, this temperature sensor 5 sticks on protective casing 12 outside surfaces, is used to measure the liquid internal temperature.Liquid level float 3 all has through hole with density float 4 centers, is enclosed within on the stainless steel outer tube 13, and easy on and off floats with the variation of liquid level or density.This compound sensor can comprise that also one is used to the snap ring 7 that prevents that described liquid level float 3 and described density float 4 from coming off from described outer tube 13, and described snap ring 7 is fixed on the bottom of described outer tube 13.
Referring to Fig. 3, Fig. 3 is the density float structural representation of the utility model one embodiment.In the present embodiment, this density float 4 comprises: floating drum 42, and described floating drum 42 internal fixation have permanent magnet ring; Be used to regulate the balancing weight 43 of the proportion of described density float 4, described balancing weight 43 is connected described floating drum 42 belows, is fixed on the floating drum 42 by being threaded in the present embodiment; Be used to avoid the density measuring staff 41 of interfering with described liquid level float 3, be connected with described floating drum 42 tops, described liquid level float 3 is arranged in the stroke range of described density measuring staff 41.In the present embodiment, described density measuring staff 41 can be at least two thin-wall circular tubes, and described thin-wall circular tube interfixes by support 44 and is connected on the described floating drum 42.Preferred described density measuring staff 41 is three sealed at both ends thin-wall circular tubes, interfixes and is welded on the stainless steel floating drum 42 by support 44 and screw 45.Described three thin-wall circular tube two ends can interfix by described support 44 respectively, and wherein an end is connected on the described floating drum 42 by described support 44.Wherein, described floating drum 42 can be stainless steel elongated cylindrical hollow-core construction (referring to Fig. 1) or plantation rubber cylindricality solid construction (referring to Fig. 4).
Because density float 4 upper design are stainless steel floating drum 42 and the density measuring staff 41 that proportion is lower than liquid, and the bottom is the bigger balancing weight of proportion 43, whole density float 4 is the axially symmetric structure of lightness sensation in the upper and heaviness in the lower, center of gravity is well below its centre of buoyancy, thereby can vertically float in the oil product naturally, avoid producing the frictional influence measuring accuracy with outer tube 13.In addition,, also need on processing and assembly technology, guarantee the symmetry of float, make its centre of buoyancy and center of gravity on same pedal line for guaranteeing that density float 4 can vertically float in the liquid naturally.
Referring to Fig. 6, Fig. 6 is the principle of work block diagram of the utility model one embodiment.In the present embodiment, described electronics storehouse 2 comprises: sensitive element head 21 electrically connects with described waveguide filament 11; Circuit board 22 comprises: exciting circuit 222 electrically connects with described waveguide filament 11; Signal processing circuit 221 electrically connects with described sensitive element head 21; Time measuring circuit 223 is connected with described signal processing circuit 221; Single-chip microcomputer 225 electrically connects with described time measuring circuit 223, described exciting circuit 222 and described temperature sensor 5 respectively; Telecommunication circuit 224 electrically connects with described single-chip microcomputer 225.Its principle of work is: single-chip microcomputer 225 control cycle impulse current generators produce driving pulse M electric current, waveguide filament 11 produces torsional wave because of magnetostrictive effect, sensitive element head 21 picks up echoed signal, carry out signal filtering and processing and amplifying then, 223 couples of driving pulse M of time measuring circuit with return pulse A, the time interval of B measures, and carries out data processing by single-chip microcomputer 225, by telecommunication circuit 224 output corresponding liquid level, density and temperature.The utility model preferably adopts 485 way of outputs, carries out data with host computer 8 and reports and communication work.In addition, in order to realize the high-accuracy high-resolution measurement, the utility model preferably adopts split-second precision measured chip TDC-GP2, and time measurement resolution reaches as high as 50ps, the utility model level gauging resolution can reach 10um, considerably beyond existing product (100um).
The position that the utility model calculates float by the time interval of measuring torsional wave pulse and driving pulse M; Referring to Fig. 5, Fig. 5 is the circuit module work wave synoptic diagram of the utility model one embodiment.After powering on, single-chip microcomputer 225 sends a driving pulse M electric current, and this electric current is propagated along waveguide filament 11 with the light velocity, produces the loop pulse electromagnetic field around waveguide filament 11.The longitudinal magnetic field stack that pulse current magnetic field produces with the magnet ring of liquid level float 3 and density float 4 respectively forms a spirality magnetic field.Because magnetostrictive effect, the waveguide filament 11 at this position produces twist distortion, generates a torsional wave pulse.This torsional pulses transfers back to sensitive element head 21 in the electronics storehouse 2 with fixing speed along waveguide filament 11, through signal processing circuit 221 mechanical torsional wave is converted to capable telecommunications number again.When the diverse location on the waveguide filament 11 is placed with liquid level float 3 and density float 4 respectively, will produce two echo interfaces.Electric current is with light velocity transmission, thereby can ignore from transmitting terminal to the current delivery time the magnetic float.By time measuring circuit 223 accurately measure driving pulse M and torsional wave the time interval (t1, t2), promptly can determine respectively liquid level float 3 and density float 4 places the position (L1, L2).By timed sending driving pulse M, just can detect the change in location of liquid level float 3 and density float 4 in real time.
The utility model density measure is based on Archimedes principle, and promptly during balance, the weight that arranges liquid equals the weight of himself to density float 4 in liquid.Density float 4 quality are certain, are immersed in the variation that change in depth in the liquid has promptly been reacted fluid density.By design density float 4 structures, in conjunction with the counterweight of adjusting balancing weight 43, be fixed on the density measure scope of sensor between given zone in.When fluid density becomes big, density float 4 certain distance that will float; When fluid density diminishes, 4 of density float certain distance of can sinking again.Density float 4 is corresponding one by one but also nonlinear relation with distance between the liquid level float 3 with density of liquid, experimental calibration and data fitting by precision, with float separation delta h is independent variable, fluid density ρ is a function, utilize the cubic polynomial match that the data that record are handled, obtain the demarcation relational expression ρ=K of float spacing and fluid density
3(Δ h)
3+ K
2(Δ h)
2+ K
1(Δ h)+K
0, K
0-K
3Be match gained parameter, can go out the density of fluid to be measured according to the float distance computation.
Concrete scaling method:
(1) oil product of preparation different densities in the density measure interval is with standard density instrumentation gauging product density value.
(2) compound sensor of the present utility model vertically is positioned in the calibrating tube, injects the oil product of different densities in the pipe, the position of reading density float 4 and liquid level float 3 is input to its special calibrating software systems.
(3) utilize the corresponding data group (more than 4 groups) of the float spacing of density correspondence, simulate the sensor input-output characteristic curve, and correlation parameter is write in the sensor single-chip microcomputer 225.
Be further measuring accuracy and the resolution of improving, practicable areal survey scheme, by stages design density float 4 structures in the utility model, are divided into four sections with density range: 0.69g/cm
3～0.74g/cm
3, 0.74g/cm
3～0.79g/cm
3, 0.79g/cm
3～0.84g/cm
3, 0.84g/cm
3～0.89g/cm
3
The utility model proposes a kind of based on magnetostriction principle, the compound sensor of on-line measurement liquid level, density, temperature simultaneously, level gauging resolution can reach 0.01mm, precision 0.2mm, density measurement accuracy 0.0005g/cm
3, 0.2 ℃ of temperature measurement accuracy possesses that cost is lower, the high-precision characteristics of high resolving power, particularly is applicable to valuable oil metering and production quality control occasion.Not only can be used for the fortune oil tank of carrier all size, also can be used for the oil product weight on-line monitoring of storage tank such as refuelling station, oil depot.If outer tube 13, liquid level float 3 and density float 4 all adopt stainless steel material, and be then nontoxic, also can be applicable to medicine, food and drink processing industry.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.
Claims (10)
1. a compound sensor is characterized in that, comprising:
One measuring staff comprises the hollow outer tube of bottom end seal in the described outer tube waveguide filament being arranged, and described waveguide filament is outside equipped with and is used to the protective casing of protecting this waveguide filament not to be damaged;
One electronics storehouse is connected with an end of described measuring staff;
One liquid level float, its internal fixation have a permanent magnet ring, and described liquid level float freedom suit is on the outer tube of described measuring staff;
One density float is arranged at described liquid level float below, and its internal fixation has a permanent magnet ring, and described density float freedom suit is on the outer tube of described measuring staff;
One temperature sensor is arranged in the described measuring staff and is installed on the described protective casing, electrically connects with described electronics storehouse.
2. compound sensor as claimed in claim 1 is characterized in that, described density float comprises:
Floating drum, described floating drum internal fixation has permanent magnet ring;
Be used to regulate the balancing weight of the proportion of described density float, described balancing weight is connected described floating drum below;
Be used to avoid the density measuring staff of interfering with described liquid level float, be connected with described floating drum top, described liquid level float is arranged in the stroke range of described density measuring staff.
3. compound sensor as claimed in claim 2 is characterized in that, described density measuring staff is at least two thin-wall circular tubes, and described thin-wall circular tube interfixes by support and is connected on the described floating drum.
4. compound sensor as claimed in claim 3 is characterized in that, described density measuring staff is three sealed at both ends thin-wall circular tubes.
5. compound sensor as claimed in claim 3 is characterized in that, described three thin-wall circular tube two ends interfix by described support respectively, and wherein an end is connected on the described floating drum by described support.
6. as claim 2,3,4 or 5 described compound sensors, it is characterized in that described floating drum is a stainless steel elongated cylindrical hollow-core construction.
7. as claim 2,3,4 or 5 described compound sensors, it is characterized in that described floating drum is a plantation rubber cylindricality solid construction.
8. as claim 1,2,3,4 or 5 described compound sensors, it is characterized in that described electronics storehouse comprises:
One sensitive element head electrically connects with described waveguide filament;
One circuit board comprises:
One exciting circuit electrically connects with described waveguide filament;
One signal processing circuit electrically connects with described sensitive element head;
One time measurement circuit is connected with described signal processing circuit;
One single-chip microcomputer electrically connects with described time measuring circuit, described exciting circuit and described temperature sensor respectively;
One telecommunication circuit electrically connects with described single-chip microcomputer.
9. compound sensor as claimed in claim 6 is characterized in that, described electronics storehouse comprises:
One sensitive element head electrically connects with described waveguide filament;
One circuit board comprises:
One exciting circuit electrically connects with described waveguide filament;
One signal processing circuit electrically connects with described sensitive element head;
One time measurement circuit is connected with described signal processing circuit;
One single-chip microcomputer electrically connects with described time measuring circuit, described exciting circuit and described temperature sensor respectively;
One telecommunication circuit electrically connects with described single-chip microcomputer.
10. as claim 1,2,3,4 or 5 described compound sensors, it is characterized in that comprise that also one is used to the snap ring that prevents that described liquid level float and described density float from coming off from described outer tube, described snap ring is fixed on the bottom of described outer tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201469352U CN202057392U (en) | 2011-05-11 | 2011-05-11 | Complex sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201469352U CN202057392U (en) | 2011-05-11 | 2011-05-11 | Complex sensor |
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| CN202057392U true CN202057392U (en) | 2011-11-30 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519553A (en) * | 2012-01-06 | 2012-06-27 | 青岛澳科仪器有限责任公司 | Magnetostrictive liquid level meter |
| CN103487116A (en) * | 2013-10-10 | 2014-01-01 | 太原理工大学 | Digital oil water demarcation face height measurement sensor |
| CN104776881A (en) * | 2014-01-14 | 2015-07-15 | 桓达科技股份有限公司 | Liquid level density sensor provided with magnetic floating balls |
| CN106679767A (en) * | 2017-01-13 | 2017-05-17 | 北京航天金泰星测技术有限公司 | Magnetostrictive liquid level sensor and fixing device thereof |
| CN107305068A (en) * | 2016-11-28 | 2017-10-31 | 杭州电子科技大学 | A kind of water-saving outlet terminal implementation method |
| CN109631737A (en) * | 2019-01-07 | 2019-04-16 | 上海自动化仪表有限公司 | The magnetostrictive displacement sensor of quick response |
| CN110081953A (en) * | 2019-06-10 | 2019-08-02 | 郑州永邦测控技术有限公司 | A kind of alcohol water float for magnetostriction liquidometer |
| CN110375829A (en) * | 2019-08-08 | 2019-10-25 | 范序政 | The method that a DN80 flange hole installs two diameter 75mm magnetic float liquid level sensors on container |
| CN110451111A (en) * | 2018-05-08 | 2019-11-15 | 中国石油天然气股份有限公司 | System for tank heating and method thereof |
| CN111089660A (en) * | 2020-01-03 | 2020-05-01 | 河北工业大学 | Absolute ultrasonic magnetostrictive temperature sensor |
| CN111502797A (en) * | 2020-04-20 | 2020-08-07 | 浙江师范大学 | Engine oil quality detection device |
-
2011
- 2011-05-11 CN CN2011201469352U patent/CN202057392U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519553A (en) * | 2012-01-06 | 2012-06-27 | 青岛澳科仪器有限责任公司 | Magnetostrictive liquid level meter |
| CN102519553B (en) * | 2012-01-06 | 2013-10-23 | 青岛澳科仪器有限责任公司 | Magnetostrictive liquid level meter |
| CN103487116A (en) * | 2013-10-10 | 2014-01-01 | 太原理工大学 | Digital oil water demarcation face height measurement sensor |
| CN103487116B (en) * | 2013-10-10 | 2016-07-06 | 太原理工大学 | A kind of digital oil water demarcation face height measurement sensor |
| CN104776881A (en) * | 2014-01-14 | 2015-07-15 | 桓达科技股份有限公司 | Liquid level density sensor provided with magnetic floating balls |
| CN107305068A (en) * | 2016-11-28 | 2017-10-31 | 杭州电子科技大学 | A kind of water-saving outlet terminal implementation method |
| CN107305068B (en) * | 2016-11-28 | 2020-09-11 | 杭州电子科技大学 | Water-saving type water outlet terminal implementation method |
| CN106679767A (en) * | 2017-01-13 | 2017-05-17 | 北京航天金泰星测技术有限公司 | Magnetostrictive liquid level sensor and fixing device thereof |
| CN110451111A (en) * | 2018-05-08 | 2019-11-15 | 中国石油天然气股份有限公司 | System for tank heating and method thereof |
| CN109631737A (en) * | 2019-01-07 | 2019-04-16 | 上海自动化仪表有限公司 | The magnetostrictive displacement sensor of quick response |
| CN110081953A (en) * | 2019-06-10 | 2019-08-02 | 郑州永邦测控技术有限公司 | A kind of alcohol water float for magnetostriction liquidometer |
| CN110375829A (en) * | 2019-08-08 | 2019-10-25 | 范序政 | The method that a DN80 flange hole installs two diameter 75mm magnetic float liquid level sensors on container |
| CN111089660A (en) * | 2020-01-03 | 2020-05-01 | 河北工业大学 | Absolute ultrasonic magnetostrictive temperature sensor |
| CN111089660B (en) * | 2020-01-03 | 2024-03-22 | 河北工业大学 | Absolute ultrasonic magnetostrictive temperature sensor |
| CN111502797A (en) * | 2020-04-20 | 2020-08-07 | 浙江师范大学 | Engine oil quality detection device |
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Inventor after: Zhao Qiaozhuan Inventor after: Chen Shi Inventor before: Zhao Qiaozhuan |
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