CN1193103A - Passive liquid-level sensor - Google Patents
Passive liquid-level sensor Download PDFInfo
- Publication number
- CN1193103A CN1193103A CN98104977A CN98104977A CN1193103A CN 1193103 A CN1193103 A CN 1193103A CN 98104977 A CN98104977 A CN 98104977A CN 98104977 A CN98104977 A CN 98104977A CN 1193103 A CN1193103 A CN 1193103A
- Authority
- CN
- China
- Prior art keywords
- sensor
- circuit
- liquid
- induction
- level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The passive lovel sensor relates to a sensor for monitoring level, which is characterized by that it is a rod data smapling sensor using magnetic induction of magnetic-sensing device to sample and having no need of power supply. Said sensor possesses a level nerve line formed of some induction neuron switching circuits, and uses it to transfer level data, and every induction neuron switching circuit comprises a group of magnetic-sensing devices and weight resistance network. Its sampling data is accurate, use is safe and reliable, installation and maintenance are convenient and application range is extensive.
Description
Passive liquid-level sensor of the present invention belongs to technical field of automatic control, particularly is a kind of Level Detection that is used for, especially for the sensor of oil level detection.
Technology and the product that adopts aspect level monitoring both at home and abroad is many at present, concludes for following several:
1, ultrasonic detector.This series products mainly is suitable for the Level Detection of broad area.Instrument is installed in the top away from liquid level, transmits and receives electromagnetic wave to liquid level, and measures electromagnetic reflection wavelength, cycle, measures the distance of liquid level apart from instrument, thereby measures liquid level.This type of production producer is all arranged at present both at home and abroad.
2, differential level sensor: along with development of semiconductor, the semiconductor surface diffusion technique has obtained widespread use in the making of sensor balanced bridge.The diffuse si differential pressure pickup is a pressure principle of utilizing liquid, detects the pressure reduction of the strong and standard atmospheric pressure of liquid base pressure at the bottom of liquid.It is to force semiconductor diffuse si film to produce the piezoelectric effect of deformation by the liquid base pressure, and obtains water level signal.This type of production producer is all arranged at present both at home and abroad.
3, condenser type water (thing) level sensor: be new product, the new technology that occurred in recent years, it relies on capacitance principle and makes.Electric capacity is made of two-plate and medium, changes medium and will change electric capacity.Liquid is as the medium of electric capacity, and it is many more that liquid floods sensor, and the also many more electric capacitys of medium filling are big more.By detecting the size of electric capacity, detect liquid level.Mainly contain several productions such as West Germany, Japan, Canada, the present domestic manufacturer production that also has.
Though more than several sensor technology comparative maturities owing to be subjected to the restriction of service condition, environment aspect, make their usable range be subjected to very big limitation.Particularly in inflammable and explosive liquid, such as the Level Detection of gasoline, kerosene, their use has been subjected to very big limitation.In petrochemical industry and POL depot management, original oil scale, manual measurements are still used in the most places of oil level monitoring at present.
Along with rapid development of science and technology, oil level monitoring just large-scale oil depot and petrochemical industry use in the control automatically, that the oil level detection that spreads all over cities and towns and highway aspects such as refuelling station along the line all suddenly needs is new, can satisfy the general oil level detection control control device that high-performance again can be widely applicable.
Order of the present invention must be:
1, passive detection, safe and reliable, solved the liquid level continuous detecting problem of flammable and combustible liquids.Oil level detection problem as aspects such as oil depot, refuelling stations.
2, enlarge the scope of application, solve installation, use, problem easy to maintenance.
3, reduce cost, provide a kind of simple in structure, adaptable Level Detection liquid level sensor.
Passive liquid-level sensor of the present invention is according to imitative biology. and the theoretical thinking of neural network designs.If a people stands in the water, know that also water logging is less than that position of own health even close eyes.This is that each cell is equivalent to a sensor because human body is a mass of neurocyte, and numerous neurocyte have been formed neural network, neuralward maincenter (brain) mail message.The present invention finishes the transmission of liquid level information by the magnetosensitive neural line that the neural point of several magnetosensitive senses constitutes.Each magnetosensitive induction point is to constitute the magnetic switch circuit by a cover magneto sensor, constitutes the oil level information network by several magnetic switch circuit and weighted resistance network.
Passive liquid-level sensor of the present invention is characterized in that it being a kind of, what liquid level signal can be by suspension magnetic induction neuron circuit sampling, by the bar type sensor that several magnetic inductive neuron circuits are formed, this sensor is made up of two parts on the whole.A part is the data-signal collecting part, and another part is that part is sent in the data-signal change.The data-signal collecting part, its chip skeleton is made with dielectric panel, the front of chip is fixed with some blocks of induction neuron circuit plates, every induction neuron circuit all is to be made of one group of magnetic induction switch circuit, each magnetic induction unit circuit all is the form output signal with switch, be fixed in the induction neuron circuit on the sensor chip skeleton front, it is spaced apart 0.5 centimetre.The chip skeleton of whole passive liquid-level sensor forms with the insulating material casting, and chip becomes a cross section after casting be rectangular solid barred body.Its cross section is generally 20 millimeters * 30 millimeters, and length generally can be designed to 0.5-20 rice as the case may be.The suspension magnetic that is attached to liquid level changes with liquid level change responds to the neural point of corresponding magnetosensitive.
Passive liquid-level sensor is characterized in that the most handy epoxy resin board of chip skeleton makes, and plastic insulating material casting such as available epoxy, plastics form.Shell and whole the branch with liquid contacting part all adopt stainless steel to make, and be antirust, anticorrosion, durable in use.The hydrolock lead terminal is that corresponding neuron circuit sends signal to maincenter when liquid level changes up and down with plastics and epoxy resin or the making of other insulating material.Particularly be exactly, liquid level is during near certain induced inside unit circuit, and this circuit produces switch upset, and just signal becomes " 0 " by " 1 ".Output signal becomes " 1 " by " 0 " when liquid level leaves intrinsic nerve unit circuit.Several are responded to first on-off circuit and have formed a liquid (oil) position neural line.See schematic diagram for details.(Fig. 1) some induction unit's on-off circuits and weighted resistance network have constituted the liquid level decoding circuit.Total effect of whole conversion is: the liquid level change with from low to high finally is transformed to 1-5V, signal output in the mark of 4-20 milliampere.
Passive liquid-level sensor has designed anti-power circuit especially in order to prevent the influence of static or external power supply in sensor and between sensor and the transmitter.If because of maloperation or other reason make signal wire charged, this circuit can play buffer action, and power supply is refused in oil tank (oil depot district) in addition.
Passive liquid-level sensor has different specifications, and its barred body external diameter is 20 millimeters * 30 millimeters.Length is 0.5 meter-20 meters.This sensor mainly is made up of two parts, and a part is a part of data acquisition, and another part is the signal transmitting part.(structure auspicious see Fig. 2, Fig. 3, Fig. 4)
The function of signals collecting part is that liquid level is converted to digital impedance signal.Its chip skeleton (1) is made with epoxy resin board, and the front of (or other dielectric panel) chip is fixed with some magnetic induction unit's on-off circuits (2) and weighted resistance network.The chip of making is put into stainless steel casing (3), forms with the insulating material casting then.The casting Available Material has epoxy resin, plastics etc.
Lead terminal (4) the plug-in type lead terminal that has water seal of design voluntarily.(this connector need not to do other water-proofing treatment and can drop into use in the water (oil) entirely after patching fastening getting well.
The function of signal transmitting part is that digital impedance signal is for conversion into voltage (1-5V) and electric current (4-20 milliampere) signal that meets international standard.Transmitter has power isolation circuit between the two away from (greater than 200 meters) part of data acquisition.
The main application and the advantage of invention:
1, purposes: the oil level that is used for oil, chemical industry and industrial and mining enterprises detects automatically.Be used for oil level detection and POL measuring management such as oil depot, oil tanker, refuelling station.
2. advantage:
A, passive, not have electricity, fire prevention, explosion-proof performance good.
B, digital quantity detect, the precision height, and error is little, and is reliable and stable.
C, full throw-in type, installation, use, easy to maintenance.
Most preferred embodiment: troops oil depot is with 3 meters liquid level sensors.
Sensor section is 25 millimeters * 38 millimeters, and length is 3 meters.This sensor chip skeleton (1) is made with epoxy resin board.The front of chip is fixed with 600 induction neuron circuits and corresponding weighted resistance network device, and each circuit center distance is 0.5 centimetre, and chip is made in the back casts in one 25 millimeters * 38 millimeters with epoxy resin the stainless-steel tube.The top of chip skeleton is equipped with power isolation circuit.
The lead terminal plug-in type lead terminal that has oil sealing of design voluntarily.(this connector fasteningly need not to do other anti-drain process after good and can drop in the oil entirely and use patching.
Description of drawings one; Circuit theory diagrams.
1, microampere constant-current source circuit
2, decode modulated circuit
3, operational amplification circuit
4, passive buffer circuit
5,4-20m output circuit
6,1-5V output circuit
7, RS-485 serial communication interface circuit diagram 2; Fig. 3; Fig. 4; Sensor construction figure.
Fig. 2: be the sensor outer housing front view (FV).Fig. 3: be sensor internal chip front side figure.Fig. 4; It is the sensor vertical view.
1, lead-in wire connector terminals
2, sensor outer housing
3, sensing unit circuit board
4, sensor chip skeleton
5, weighted resistance network circuit board
6. epoxy resin casting inserts
Claims (2)
1, passive liquid-level sensor of the present invention is characterized in that it being a kind of, what liquid level signal can be by suspension magnetic induction sampling, the bar type sensor of forming by several magnetic inductive neuron circuits, but the passive sampling of its data, the distant signal change is sent.This sensor is made up of two parts on the whole, a part is the signal data acquisition part, another part is that part is sent in the signal data change, its chip skeleton of signal data acquisition part is made with dielectric panel, the front of chip is fixed with some blocks of induction neuron circuit plates, every induction neuron circuit all is to be made of one group of magnetic induction switch circuit, each magnetic induction unit circuit all is the form output signal with switch, be fixed in the induction neuron circuit on the sensor chip skeleton front, it is spaced apart 0.5 centimetre.It is stainless solid barred body that the chip of whole signal data acquisition part becomes a shell with the insulating material casting.Its cross section is generally 20 millimeters * 38 millimeters, and length generally can be designed to 0.5-20 rice as the case may be.The suspension magnetic that is attached to liquid level changes with liquid level change responds to corresponding magnetosensitive neuron circuit.
2,, it is characterized in that it being a kind of sensor that is mainly used in oil level detection according to the said passive liquid-level sensor of claim.Its circuit chip and metal shell are cast into one, and shell and whole the branch with liquid contacting part all adopt stainless steel or aluminum to make, and be antirust, anticorrosion, durable in use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104977 CN1069131C (en) | 1998-01-21 | 1998-01-21 | Passive liquid-level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104977 CN1069131C (en) | 1998-01-21 | 1998-01-21 | Passive liquid-level sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1193103A true CN1193103A (en) | 1998-09-16 |
| CN1069131C CN1069131C (en) | 2001-08-01 |
Family
ID=5218611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98104977 Expired - Fee Related CN1069131C (en) | 1998-01-21 | 1998-01-21 | Passive liquid-level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1069131C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221393A (en) * | 2010-04-13 | 2011-10-19 | 王恺 | Signal source device for accurately measuring oil quantity of oil tank of motor vehicle |
| CN102749127A (en) * | 2012-07-23 | 2012-10-24 | 宁夏鲁西化工化肥有限公司 | Liquid level monitoring device of phosphoric acid extraction tank |
| WO2013189124A1 (en) * | 2012-06-19 | 2013-12-27 | Guo Yunchang | Method of determining material-level curve in continuous-type passive nucleonic level gauge |
| CN107123246A (en) * | 2017-04-10 | 2017-09-01 | 劭行（苏州）智能科技有限公司 | Transformer oil surface temperature and oil condition wireless sensing system |
| CN109199119A (en) * | 2017-06-30 | 2019-01-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking equipment |
-
1998
- 1998-01-21 CN CN 98104977 patent/CN1069131C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221393A (en) * | 2010-04-13 | 2011-10-19 | 王恺 | Signal source device for accurately measuring oil quantity of oil tank of motor vehicle |
| WO2013189124A1 (en) * | 2012-06-19 | 2013-12-27 | Guo Yunchang | Method of determining material-level curve in continuous-type passive nucleonic level gauge |
| CN102749127A (en) * | 2012-07-23 | 2012-10-24 | 宁夏鲁西化工化肥有限公司 | Liquid level monitoring device of phosphoric acid extraction tank |
| CN107123246A (en) * | 2017-04-10 | 2017-09-01 | 劭行（苏州）智能科技有限公司 | Transformer oil surface temperature and oil condition wireless sensing system |
| CN109199119A (en) * | 2017-06-30 | 2019-01-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking equipment |
| CN109199119B (en) * | 2017-06-30 | 2021-06-04 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1069131C (en) | 2001-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102589644B (en) | Capacitance type liquid level sensor | |
| CN201917376U (en) | Capacitive liquid level sensor | |
| CN1192272A (en) | Magnetic relative position transducer | |
| CN101738240B (en) | Capacitance sensing type fuel meter | |
| CN201440087U (en) | High security liquid level sensor | |
| CN106052953A (en) | Shock-resistant ice-blockage resistant pressure transmitter | |
| CN1069131C (en) | Passive liquid-level sensor | |
| CN102322918B (en) | Digital liquid level sensor | |
| CN101776334A (en) | Water-level and water-temperature sensor for solar water heater | |
| CN1045018C (en) | Induction type digital water level sensor | |
| CN215064761U (en) | Liquid level meter based on transmission and reflection characteristics of signal in variable impedance medium | |
| CN2643294Y (en) | Capacitor type liquid level sensor | |
| CN205679280U (en) | A kind of ultrasonic hand-held flowmeter | |
| CN2570749Y (en) | Oil tank level electrode detecting apparatus | |
| CN2192029Y (en) | Device for measuring storage fuel contents in oil cylinder | |
| CN2251714Y (en) | Floating differential pressure interface-liquid level transducer | |
| CN1217164C (en) | Method for producing digital indexing type water level sensor | |
| CN217930451U (en) | Non-contact type water level measuring electronic water gauge | |
| CN2058747U (en) | Leve meter for solid matter | |
| CN2362108Y (en) | Resistance level sensor | |
| CN1217165C (en) | Digital indexing type water level sensor | |
| CN2276151Y (en) | Liquid level sensor device | |
| CN201837434U (en) | Integrated intelligent liquid level gauge | |
| CN208872378U (en) | Generator state detection device and generator car | |
| CN220251133U (en) | Low-cost high-sensitivity capacitive sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |