CN207976198U - A kind of capacitance type liquid level detection device - Google Patents
A kind of capacitance type liquid level detection device Download PDFInfo
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- CN207976198U CN207976198U CN201721585304.4U CN201721585304U CN207976198U CN 207976198 U CN207976198 U CN 207976198U CN 201721585304 U CN201721585304 U CN 201721585304U CN 207976198 U CN207976198 U CN 207976198U
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Abstract
The utility model provides a kind of capacitance type liquid level detection device, including level probe, the microprocessor that is connect with level probe by input/output end port；When level probe immerses testing liquid, the capacitance present value of testing liquid is detected；Microprocessor includes interactive module, setup module, judgment module, display module；Interactive module obtains the class of liquids of a testing liquid input by user；Setup module inquires the relative permitivity of testing liquid according to class of liquids, and the capacitance threshold value of testing liquid is arranged；Judgment module obtains the capacitance present value of testing liquid, is compared with capacitance threshold value；Display module shows the testing result of testing liquid.Pass through above-mentioned setting, the threshold value of liquid level detection device is set in real time according to different liquids so that a liquid level detection device detects plurality of liquid, reduces equipment cost, the accuracy for improving level detection has prodigious realistic meaning to a liquid level detection device detection plurality of liquid.
Description
Technical field
The utility model is related to detection device field more particularly to a kind of capacitance type liquid level detection devices.
Background technology
In medical treatment, industry or consumer's application, including the fluid of liquids and gases is typically stored in container.Such as
In medical field, medical institutions are carrying out needing to adopt with detection with the relevant various types of tests of patient's diagnosing and treating
Collect human body or the biological sample of animal patient, such as urine, serum, blood plasma, cerebrospinal fluid analog are detected analysis.It is similar
Ground, in industrial circle, fluid such as petrochemical industry gas and liquid, chemical gas and liquid and medicinal mixture or compound is usual
It is stored in container.In about many techniques for manufacturing this gas and liquid, it is necessary to measure the water of this gas and liquid
It is flat.For another example, in consumer domain, liquid level is kept in dish-washing machine, washing machine, water heater and fuel tank.
Liquid level sensor (static pressure liquid level meter/fluid level transmitter/liquid level sensor/water level sensor etc.) is a kind of measurement liquid
The pressure sensor of position.Liquid level sensor is divided into two classes：One kind is contact, including single flange static pressure/bis- flanges differential pressure liquid level
Transmitter, float ball type level transducer, magnetic level transmitter, throw-in type liquid transmitter, electronic inner float ball fluid level transmitter,
Electric float level transmitter, capacitive liquid level transmitter, magnetostrictive liquid level transducer, servo liquid transmitter etc..Second
Class is contactless, is divided into supersonic level sensor, radar level transmitter etc..
In the prior art, measuring the traditional method of liquid level using capacitance level transducer is set in liquid level sensor
One fixed threshold is compared after having read fluid to be measured capacitance with the fixed threshold, to judge having for liquid
Nothing.But this method is relatively high to the occasion accuracy rate that need to only detect same liquid.But if plurality of liquid need to be detected, it is examining
When measurement equipment carries out detecting liquid level, for different liquid, relative permitivity is different, and the threshold value of liquid level sensor is fixed,
Then liquid level sensor is sensitive to a kind of liquid detecting, then no longer valid to another liquid.Very in the case where threshold value is single
Difficulty accomplishes that the same liquid level sensor is effectively reliable to different liquids.So as to cause liquid under a kind of liquid level sensor of plurality of liquid
Position detection accuracy rate substantially reduces.Except the quantity of non-increasing liquid level sensor, each liquid corresponds to a liquid level sensor, in this way
The cost and complexity of equipment can be increased.
Therefore, the utility model provides a kind of capacitance type liquid level detection device, and liquid level is arranged in real time according to different liquids
The threshold value of detection device so that a liquid level detection device detects plurality of liquid, is not required to increase the quantity of liquid level detection device,
On the basis of not increasing manufacturing cost, not improving manufacture difficulty, ensure the accuracy of level detection.
Invention content
In order to overcome above-mentioned technological deficiency, the purpose of this utility model is to provide a kind of capacitance type liquid level detection devices.
The utility model discloses a kind of capacitance type liquid level detection device, the liquid level detection device includes：Level probe,
Pass through the microprocessor of input/output end port and level probe communication connection；
When the level probe immerses the testing liquid, the capacitance present value of the testing liquid is detected；
The microprocessor includes interactive module, setup module, judgment module, display module；
The interactive module obtains the class of liquids of a testing liquid input by user；
The setup module is communicated to connect with the interactive module, according to the class of liquids of the testing liquid, inquires institute
The capacitance threshold value of the testing liquid is arranged in the relative permitivity for stating testing liquid；
The judgment module communicates to connect with the setup module, the level probe, obtains working as the testing liquid
Preceding capacitance is compared with the capacitance threshold value；
The display module is communicated to connect with the judgment module, according to the capacitance present value and the capacitance threshold value
Comparison result, show the testing result of the testing liquid.
Preferably, the level probe detects the capacitance present value of the testing liquid, determines the electricity of the testing liquid
Hold changing value, so that it is determined that the liquid level of the testing liquid.
Preferably, the display module communicates to connect with the level probe, shows the liquid level of the testing liquid.
Preferably, the microprocessor further includes：Reseting module；
The reseting module communicates to connect with the display module, setup module, detects and complete in the testing liquid
Afterwards, the capacitance threshold value of the testing liquid is zeroed.
Preferably, the level probe includes a metal sensing chip, and the microprocessor is to the metal sensing chip charge and discharge
Electricity and the inductance capacitance for detecting the metal sensing chip.
Preferably, the metal sensing chip is sealed with an insulation crust.
After using above-mentioned technical proposal, compared with prior art, have the advantages that：
1. capacitance type liquid level detection device provided by the utility model, is arranged liquid level detection device in real time according to different liquids
Threshold value so that liquid level detection device detects plurality of liquid, is not required to increase the quantity of liquid level detection device, is not increasing system
Cause this, do not improve manufacture difficulty on the basis of, ensure the accuracy of level detection.
Description of the drawings
Fig. 1 is the structural schematic diagram for the liquid level detection device for meeting one preferred embodiment of the utility model.
Reference numeral：
100- liquid level detection devices；
11- level probes；
12- microprocessors；
121- interactive modules；
122- setup modules；
123- judgment modules；
124- display modules；
125- reseting modules.
Specific implementation mode
The advantages of the utility model is expanded on further below in conjunction with attached drawing and specific embodiment.
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
It is the purpose only merely for description specific embodiment in the term that the disclosure uses, is not intended to be limiting the disclosure.
" one " of singulative used in disclosure and the accompanying claims book, " described ", "the" etc. are also intended to including majority
Form, unless context clearly shows that other meanings.It is also understood that term "and/or" used herein refers to and wraps
Containing one or more associated list items purposes, any or all may be combined.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " connection " etc. should be done
It broadly understood, for example, it may be mechanical connection or electrical connection, can also be the connection inside two elements, can be direct phase
Even, it can also manage as the case may be indirectly connected through an intermediary, for the ordinary skill in the art
Solve the concrete meaning of above-mentioned term.
With reference to figure 1, the utility model provides a kind of capacitance type liquid level detection device 100, and liquid level detection device 100 wraps
It includes：Level probe 11, the microprocessor 12 communicated to connect by input/output end port and level probe 11；
When level probe 11 immerses testing liquid, the capacitance present value of testing liquid is detected；
Microprocessor 12 includes interactive module 121, setup module 122, judgment module 123, display module 124；
Interactive module 121 obtains the class of liquids of a testing liquid input by user；
Setup module 122 is communicated to connect with interactive module 121, according to the class of liquids of testing liquid, inquires testing liquid
Relative permitivity, the capacitance threshold value of testing liquid is set；
Judgment module 123 communicates to connect with setup module 122, level probe 11, obtains the capacitance present of testing liquid
Value, is compared with capacitance threshold value；
Display module 124 is communicated to connect with judgment module 123, according to the comparison result of capacitance present value and capacitance threshold value,
Show the testing result of testing liquid.
In the utility model, liquid level detection device 100 includes level probe 11, and passes through input/output end port and liquid
The microprocessor 12 that position probe 11 communicates to connect.
Level probe 11
In a preferred embodiment, level probe 11 includes a metal sensing chip, and the microprocessor 12 is to the metal
Sensing chip charge and discharge and the inductance capacitance for detecting the metal sensing chip.
Further, the metal sensing chip is sealed with an insulation crust.
In the utility model, level probe 11 is equipped with liquid level sensor can detect prepare liquid when immersing testing liquid
The capacitance present value of body.It is a sheet metal that level probe 11, which has induction electrode, induction electrode, is equipped with and seals very thin insulation
Shell.Sheet metal and insulation crust are all placed on volume, pipeline or the vessel for containing liquid.
Microprocessor 12
It is equipped with high performance real-time microprocessor 12 in liquid level detection device 100, using CAN communication mode, can incite somebody to action
The capacitance variations value measured is converted into corresponding level value according to saltus step threshold value set by user, and opens by LED and accordingly
Drain port output.
Microprocessor 12 includes interactive module 121, setup module 122, judgment module 123, display module 124 etc.；Wherein,
Interactive module 121 obtains the class of liquids of a testing liquid input by user, is liquid A as user inputs testing liquid；Setting
Module 122 is communicated to connect with interactive module 121, according to the class of liquids A of testing liquid input by user, inquires testing liquid
Relative permitivity εA, the capacitance threshold value T of testing liquid is setA；Judgment module 123 is logical with setup module 122, level probe 11
Letter connection obtains the capacitance present value T of testing liquid, with electricity after the capacitance present value T that level probe 11 detects testing liquid
Hold threshold value TAIt is compared；Display module 124 is communicated to connect with judgment module 123, according to capacitance present value T and capacitance threshold value TA
Comparison result, show the testing result of testing liquid, judge the presence or absence of testing liquid.
In a preferred embodiment, it while level probe 11 detects the capacitance present value of testing liquid, is calculated and waits for
The capacitance variations value for surveying liquid, so that it is determined that the liquid level of testing liquid.
Further, display module 124 are communicated to connect with level probe 11, are showing the testing result of testing liquid
Meanwhile showing the liquid level for the testing liquid that detection obtains.
In a preferred embodiment, microprocessor 12 further comprises reseting module 125, reseting module 125 and display mould
Block 124, setup module 122 communicate to connect, and after the completion of testing liquid detects, the capacitance threshold value of testing liquid is zeroed.So as to
Other testing liquids, such as liquid B, C are measured.
The method that capacitance type liquid level detection device according to the present utility model carries out level gauging includes the following steps：
S100：Obtain the class of liquids of a testing liquid input by user；
S200：According to the class of liquids of the testing liquid, the relative permitivity of the testing liquid is inquired, described in setting
The capacitance threshold value of testing liquid；
S300：The level probe of capacitance type liquid level detection device is immersed into testing liquid, detection obtains the testing liquid
Capacitance present value；
S400：The capacitance present value of the obtained testing liquid is compared with the capacitance threshold value；
S500：According to the comparison result of the capacitance present value and the capacitance threshold value, the inspection of the testing liquid is shown
Survey result.
In a preferred embodiment, S300：The level probe of capacitance type liquid level detection device is immersed into testing liquid, detection
The step of capacitance present value for obtaining the testing liquid includes：
S310：The level probe of capacitance type liquid level detection device is immersed into testing liquid, detection obtains the testing liquid
Capacitance present value；
S320：The level probe detects the capacitance present value of the testing liquid, determines the capacitance of the testing liquid
Changing value, so that it is determined that the liquid level of the testing liquid.
Further, S500：According to the comparison result of the capacitance present value and the capacitance threshold value, display is described to be measured
The step of testing result of liquid further includes：Show the liquid level of the testing liquid.
In a preferred embodiment, the measurement method is further comprising the steps of：
S600：After the completion of the testing liquid detects, the capacitance threshold value of the testing liquid is zeroed.
The variation that non electrical quantity is utilized in capacitance type sensor is converted into the variation of capacitance to realize the measurement to physical quantity.
Capacitance type sensor is widely used in the accurate measurement of the mechanical quantities such as displacement, vibration, angle, acceleration, and is just gradually expanded to pressure
The measurement of power, differential pressure, liquid level (material position), component content etc..Capacitance type sensor has the characteristics that following：1) mechanism letter
Single, small, resolving power is high；It 2) can real non-contact measurement；3) dynamic effect is good.The intrinsic frequency of capacitance type sensor is very
Height, therefore the dynamic effect time is short, and its dielectrical loss is small, and higher working frequency can be used, and can be used for measuring high speed and changes
Parameter；4) temperature stability is good.Itself calorific value is minimum；5) can under the mal-conditions such as high temperature, radiation and strong vibration work
6) capacitance is small for work, and power is small, and output impedance is high, and therefore, load capacity is poor, easily by extraneous anti-interference generation wild effect.
Capacitance type sensor is a kind of sensor for tested non electrical quantity being converted to the variation of selfcapacity amount.These are measured
It is to realize what it was converted for changing the variable element of composition capacitor.The basic functional principle of capacitance type sensor can be used
Most common plane-parallel capacitor illustrates.Two pieces of metal polar plates being mutually parallel, when not considering its edge effect (two pole
The uneven variation for causing capacitance of the electric force lines distribution of plate edge) when, capacitance is：
Wherein, dielectric constants of the ε between capacitor plate；The area that A is covered by two parallel-plates；D be two-by-two parallel-plate it
Between distance.
As long as therefore changing one of parameter, the variation of capacitance will be caused, according to this capacitance structure relationship
It may make up Capacitive Displacement Sensor, capacitor sensor with changed area and change medium sensor, the capacitance for measuring liquid level
Formula sensor.When be using the material in container being constant dielectric constant, interelectrode capacity is proportional to the principle of liquid level and constitutes
, and applied electronics method measures capacitance, to detect liquid level position information.Feature is level gauging and capacitance structure
It is related, it is unrelated with the density of material that the columnar structured liquid level sensor for constituting changed area can be used according to this feature, this
The probe of kind sensor structure is made of the two electrode pads, by air-liquid or expects that the height difference of phase medium causes pole
Between capacitance change and detect object plane position.Its structure very simple is light and handy, is easily installed, safeguards and uses.
Conducting liquid capacitance type sensor mainly utilizes the area coverage of two electrode of sensor with the change of fluid to be measured liquid level
Change and change, carries out level gauging so as to cause the relationship of electric capacitance change, belong to area change type capacitance sensor.If conductive
Container diameter is D, and the dielectric constant of a diameter of d of contre electrode, upper air are ε1, the dielectric constant of lower liquid is ε2, electrode
Overall length is H0, the length submerged in a liquid is H1, then the capacitance of air part can be written according to the formula of concentric circles tubular capacitance
Mathematical model is：
The capacitance of liquid portion is：
After ignoring stray capacitance and the boundary effect of end, the total capacitance between two-stage is
Wherein, C0For initial capacitance, the capacitance measured when liquid is zero；K is transducer sensitivity.
After electrode is surrounded by insulating layer, if with container is concentric installs, a diameter of D of electrode dielectric layer is set1, container diameter is
D, electrode diameter d, the dielectric dielectric constant of electrode dielectric layer are ε1, the dielectric constant of liquid dielectric is ε2, air electricity Jie
The dielectric constant of matter is ε3.C in equivalent circuit1Indicate the stray capacitance unrelated with liquid level, C2Indicate that the electrode of air part is exhausted
Edge layer is dielectric capacitance, and value is：
C3Indicate that dielectric capacitance in air dielectric, value are：
C4Indicate that electrode dielectric layer is dielectric capacitance in liquid, value is：
C5Expression fluid to be measured is dielectric capacitance, and value is：
C2Table and C3It is series relationship, C4With C5Be also series relationship, by the two series circuits again and C1Parallel connection, therefore：
For determining medium, the C in formula0And, constant initial capacitance is considered as preceding two constants, and
Section 3 is considered as the product of sensitivity K1 and H1, when the liquid in container is conducting medium, C5=0, then
The above analysis can obtain, when measuring the boundary position between two kinds of liquid, if being non-conductive liquid, using bare electrode.If
It is conducting liquid wherein to have a kind of, must just use the electrode of packet insulating layer, and sensitivity is directly proportional to the difference of two kinds of dielectric constants,
Therefore, more valuable using capacitance rule when the density of two kinds of liquid is identical, and dielectric constants are very big.With viscosity
Even if conducting medium liquid using the electrode of insulating layer, will produce bridging phenomenon, keep measurement error larger, cannot be expired
The measurement result of the true liquid level of meaning.
The sensitivity of capacitance liquid level meter depends primarily on the difference of two kinds of dielectric constants, moreover, only constant could be protected
It is accurate to demonstrate,prove level gauging, because measured medium is conductive, so metal bar electrode has insulating layer covering.
Capacitance level transducer capacitance and capacitance variations value are all very small, and the capacitance of capacitance sensor is general
It is pF grades, in order to measure so small capacitance, it is necessary to this small capacitance increment is detected by the measuring circuit specially designed, it will
The variation of this capacitance detected is converted to the variation of the frequency for being proportional to capacitance, voltage or electric current, the utility model
The variation for being translated into voltage value may be used in embodiment.
According to differences such as measurement request, measurement objects, used measuring circuit is also different, usually there is annular two poles
Pipe circuit, FM circuit, operational amplifier formula circuit, diode dimorphism AC bridge, pulse-width modulation circuit etc. are several.
It should be noted that the embodiments of the present invention have preferable implementation, and not the utility model is appointed
The limitation of what form, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above
Same effective embodiment, as long as without departing from the content of technical solutions of the utility model, according to the technical essence of the utility model pair
Any modification or equivalent variations and modification, are still within the scope of the technical solutions of the present invention made by above example.
Claims (6)
1. a kind of capacitance type liquid level detection device, which is characterized in that
The liquid level detection device includes：Level probe, communicated to connect with the level probe by input/output end port it is micro-
Processor；
When the level probe immerses testing liquid, the capacitance present value of the testing liquid is detected；
The microprocessor includes interactive module, setup module, judgment module, display module；
The interactive module obtains the class of liquids of a testing liquid input by user；
The setup module is communicated to connect with the interactive module, according to the class of liquids of the testing liquid, is waited for described in inquiry
The relative permitivity for surveying liquid, is arranged the capacitance threshold value of the testing liquid；
The judgment module communicates to connect with the setup module, the level probe, obtains the current electricity of the testing liquid
Capacitance is compared with the capacitance threshold value；
The display module is communicated to connect with the judgment module, according to the ratio of the capacitance present value and the capacitance threshold value
Compared with as a result, showing the testing result of the testing liquid.
2. liquid level detection device as described in claim 1, which is characterized in that
The level probe detects the capacitance present value of the testing liquid, determines the capacitance variations value of the testing liquid, from
And determine the liquid level of the testing liquid.
3. liquid level detection device as claimed in claim 2, which is characterized in that
The display module communicates to connect with the level probe, shows the liquid level of the testing liquid.
4. liquid level detection device as described in any one of claims 1-3, which is characterized in that
The microprocessor further includes：Reseting module；
The reseting module is communicated to connect with the display module, setup module, will after the completion of the testing liquid detects
The capacitance threshold value of the testing liquid is zeroed.
5. liquid level detection device as described in any one of claims 1-3, which is characterized in that
The level probe includes a metal sensing chip, and the microprocessor is to described in the metal sensing chip charge and discharge and detection
The inductance capacitance of metal sensing chip.
6. liquid level detection device as claimed in claim 5, which is characterized in that the metal sensing chip is sealed with outside an insulation
Shell.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579021A (en) * | 2020-04-21 | 2020-08-25 | 汕头大学医学院 | Capacitance liquid level type volume density meter, testing method, image pickup method, and storage medium |
| CN112525291A (en) * | 2020-12-16 | 2021-03-19 | 深圳市纵维立方科技有限公司 | Printing apparatus and liquid level depth detection method |
| CN112629616A (en) * | 2021-01-05 | 2021-04-09 | 华南农业大学 | Material level detection device and material level detection method for unmanned aerial vehicle medicine chest |
| CN112697227A (en) * | 2020-12-29 | 2021-04-23 | 深圳市科皓信息技术有限公司 | Electrode-based liquid monitoring method, liquid monitoring device and storage medium |
| CN113074794A (en) * | 2020-01-06 | 2021-07-06 | 联阳半导体股份有限公司 | Liquid level detector and liquid level detection method |
| CN114995559A (en) * | 2022-04-11 | 2022-09-02 | 西南石油大学 | Control system and control method of intelligent biological sample repository |
| CN116989868A (en) * | 2023-06-08 | 2023-11-03 | 中元汇吉生物技术股份有限公司 | Multi-parameter fusion liquid level detection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074794A (en) * | 2020-01-06 | 2021-07-06 | 联阳半导体股份有限公司 | Liquid level detector and liquid level detection method |
| CN111579021A (en) * | 2020-04-21 | 2020-08-25 | 汕头大学医学院 | Capacitance liquid level type volume density meter, testing method, image pickup method, and storage medium |
| CN112525291A (en) * | 2020-12-16 | 2021-03-19 | 深圳市纵维立方科技有限公司 | Printing apparatus and liquid level depth detection method |
| CN112697227A (en) * | 2020-12-29 | 2021-04-23 | 深圳市科皓信息技术有限公司 | Electrode-based liquid monitoring method, liquid monitoring device and storage medium |
| CN112629616A (en) * | 2021-01-05 | 2021-04-09 | 华南农业大学 | Material level detection device and material level detection method for unmanned aerial vehicle medicine chest |
| CN114995559A (en) * | 2022-04-11 | 2022-09-02 | 西南石油大学 | Control system and control method of intelligent biological sample repository |
| CN116989868A (en) * | 2023-06-08 | 2023-11-03 | 中元汇吉生物技术股份有限公司 | Multi-parameter fusion liquid level detection device and method |
| CN118090841A (en) * | 2024-04-26 | 2024-05-28 | 常熟理工学院 | Fluid layering interface detection device, paraffin and PTFE separation device and method |
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