CN209296088U - A kind of capacitance type liquid level measuring device - Google Patents
A kind of capacitance type liquid level measuring device Download PDFInfo
- Publication number
- CN209296088U CN209296088U CN201821866165.7U CN201821866165U CN209296088U CN 209296088 U CN209296088 U CN 209296088U CN 201821866165 U CN201821866165 U CN 201821866165U CN 209296088 U CN209296088 U CN 209296088U
- Authority
- CN
- China
- Prior art keywords
- capacitance electrode
- high capacitance
- container
- liquid level
- survey high
- 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.)
- Active
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to a kind of capacitance type liquid level measuring devices.The capacitance type liquid level measuring device includes the container for placing liquid；At least one set surveys high capacitance electrode pair, and to including two survey high capacitance electrodes, two survey high capacitance electrode centers are symmetricly set on the side wall of container each survey high capacitance electrode；Container bottom, the calibration capacitance electrode for calibrating characteristics of liquids are set；With survey high capacitance electrode to and calibration capacitance electrode connect, for receives detect capacitance capacitor conversion digit chip, capacitance can be will test and be converted to liquid height value.When by implementing the utility model, by the liquid level in symmetrical capacitance measurement container, not needing to contact with liquid, and measuring, even if liquid level run-off the straight, accurate liquid level can be still obtained, setting is simple, and measurement is convenient.
Description
Technical field
The utility model relates to liquid height detection fields, more specifically to a kind of capacitance type liquid level measuring device.
Background technique
Measurement for liquid height in container, the prior art mainly use two kinds of technical solutions, and one is in container
Portion is directly measured, and directly measurement needs measuring device with waterproofness, anticorrosion, installation difficulty is big, later maintenance is not square
Just defect.Another kind is to be measured indirectly by sensor in external container, and this method requires container in a vertical state,
It cannot be in heeling condition, otherwise will lead to measurement inaccuracy.
In addition, the digital information of liquid level position in container cannot be directly displayed in the prior art, and it is only capable of through wired side
Formula transmission carries out data transmission.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of condenser type
Liquid level emasuring device.
The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of capacitance type liquid level measuring dress
It sets, including the container for placing liquid, further includes:
At least one set surveys high capacitance electrode pair, and the survey high capacitance electrode is to including two survey high capacitance electrodes, two institutes
Survey high capacitance electrode centers are stated to be symmetricly set on the side wall of the container；
The container bottom, the calibration capacitance electrode for calibrating characteristics of liquids are set；
With the survey high capacitance electrode to connect with the calibration capacitance electrode, for receiving the capacitor turn for detecting capacitance
Digit chip.
Further, capacitance type liquid level measuring device described in the utility model, the survey high capacitance electrode to for two groups with
On, survey high capacitance electrode is to including the consistent survey high capacitance electrode of two models, two survey high capacitance electrodes described in every group
Center symmetric setting is on the lateral wall of the container；
Survey high capacitance electrode described in every group is arranged from the container bottom to container top sequence, and described in two adjacent groups
High capacitance electrode is surveyed to be overlapped in Partial Height.
Further, capacitance type liquid level measuring device described in the utility model further includes converting digital core with the capacitor
Piece connection, the display screen for showing measurement gained liquid height value.
Further, capacitance type liquid level measuring device described in the utility model further includes converting digital core with the capacitor
Piece connection, the communication module for sending measurement gained liquid height value.
Further, capacitance type liquid level measuring device described in the utility model, the communication module are wire communication module
Or wireless communication module；
The wireless communication module includes 3G wireless communication module, 4G wireless communication module, 5G wireless communication module, Sub-
One of G wireless module, zigbee wireless module, bluetooth module, WIFI module.
Further, capacitance type liquid level measuring device described in the utility model, the capacitor conversion digit chip are
EFM8SB10 single-chip microcontroller, the communication module are SI4438 wireless communication chips；
The container is nonmetallic vessel.
In addition, the utility model also provides a kind of capacitance type liquid level measuring method, surveyed applied to such as above-mentioned capacitance type liquid level
Measure device, which comprises
S1, the reference capacitance value C for surveying high capacitance electrode is surveyed in high capacitance electrode pair in measurement under container blank statebase；
S2, the detection electricity that high capacitance electrode is surveyed in the survey high capacitance electrode centering is measured after injecting liquid in the above-described container
Capacitance Crst；
S3, the positive area that high capacitance electrode and liquid are surveyed in the survey high capacitance electrode centering is calculated according to following formula
Slqd:
Crst=Cbase+kSlqd
Wherein k is capacity area coefficient；
S4, the capacitor width for surveying high capacitance electrode centering survey high capacitance electrode is set as A, the survey high capacitance electrode is just
Height to liquid is H, then
Slqd=A*H
S5, the liquid height is calculated according to the height H for surveying high capacitance electrode face liquid.
Further, capacitance type liquid level measuring method described in the utility model, if the bottom of liquid levels and the container
In parallel, then the step S1 to step S4 is executed, the capacitor for surveying the centering of high capacitance electrode two survey high capacitance electrodes is measured
Height respectively H1 and H2, and H1=H2；
It is H1 or H2 that the liquid height is calculated in the step S5.
Further, capacitance type liquid level measuring method described in the utility model, if the bottom of liquid levels and the container
It is not parallel, then the step S1 to step S4 is executed, the electricity for surveying the centering of high capacitance electrode two survey high capacitance electrodes is measured
Hold height respectively H3 and H4, and H3 ≠ H4；
It is/2 that the liquid height is calculated in the step S5.
Further, capacitance type liquid level measuring method described in the utility model, before the step S1 further include:
S0, the calibration capacitance value for injecting measurement measurement calibration capacitance electrode after liquid in the above-described container, according to the school
The attribute information of pseudo-capacitance value acquisition liquid；
After the step S5 further include:
S6, the liquid height is shown by display screen；And/or
S7, the liquid height is sent by communication module.
A kind of capacitance type liquid level measuring device for implementing the utility model, has the advantages that
The utility model relates to a kind of capacitance type liquid level measuring devices.The capacitance type liquid level measuring device includes for placing
The container of liquid；At least one set surveys high capacitance electrode pair, and each surveys high capacitance electrode is to including two survey high capacitance electrodes, and two
High capacitance electrode centers are surveyed to be symmetricly set on the side wall of container；Container bottom, the calibration for calibrating characteristics of liquids are set
Capacitance electrode；With survey high capacitance electrode to and calibration capacitance electrode connect, the capacitor conversion for receiving detection capacitance it is digital
Chip can will test capacitance and be converted to liquid height value.By implementing the utility model, by symmetrical capacitance measurement container
Liquid level, do not need to contact with liquid, moreover, even if measurement when, liquid level run-off the straight can still obtain accurate liquid
Face height, setting is simple, and measurement is convenient.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the structural schematic diagram of the utility model first embodiment；
Fig. 2 is the container cross section structural schematic diagram of the utility model first embodiment；
Fig. 3 is the structural schematic diagram of the utility model second embodiment；
Fig. 4 is the structural schematic diagram of the utility model 3rd embodiment；
Fig. 5 is the structural schematic diagram of the utility model fourth embodiment；
Fig. 6 is the structural schematic diagram of the 5th embodiment of the utility model；
Fig. 7 is the structural schematic diagram of the utility model sixth embodiment.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
First embodiment
With reference to Fig. 1 and Fig. 2, capacitance type liquid level measuring device includes the container 10 for placing liquid 20 in the present embodiment,
Because the present embodiment measures the height of 20 liquid level of liquid using the variation of capacitance, it requires that container 10 is nonmetallic vessel,
The material of container 10 also selects synthesis class compound, plastics, glass, wooden etc., these materials do not influence the composition and survey of capacitor
Amount.Preferably, container 10 is symmetrical container, and cross section is center symmetric figure.
Capacitance type liquid level measuring device includes at least one set of high capacitance electrode of surveying to 30 in the present embodiment, each survey high capacitance
Electrode includes two survey high capacitance electrodes 301 to 30, and two are surveyed 301 center symmetric setting of high capacitance electrode in the side wall of container 10
On.It should be noted that the survey high capacitance electrode positioned at 10 sidewall bottom of container should be down to container inside to 30 bottom end height
Bottom is on the lower side, i.e., the bottom end height of corresponding two surveys high capacitance electrode 301 should be on the lower side down to container inside bottom, to guarantee to hold
The liquid level of arbitrary height all can accurately measure in device 10.Alternatively, surveying high capacitance electrode 301 can be by pasting or using external
Fixing piece is fixed on the side wall of container 10.Preferably, the survey high capacitance electrode 301 in the present embodiment is rectangular capacitive.
When only one group of survey high capacitance electrode is to 30, which includes two survey high capacitance electrodes to 30
301, two survey 301 center symmetric settings of high capacitance electrode are on the side wall of container 10.It should be noted that each survey high capacitance
Electrode 301 can independent measurement capacitance, and calculate corresponding liquid level；That is, surveying high capacitance electrode to 30
In two survey high capacitance electrodes 301 measure corresponding liquid level respectively, then calculate liquid again according to two liquid levels
The average height in face.It should be understood that the height of two survey high capacitance electrodes 301 should be greater than or be equal to, liquid 20 can in container 10
The maximum height of energy, so as to measure the arbitrary height of liquid 20.Preferably, the survey high capacitance electrode is high to 30 two surveys
301 model of capacitance electrode is consistent, i.e. the parameters such as the material, size of electrode, thickness are all consistent.
When surveying high capacitance electrode to 30 to be more than two, every group of survey high capacitance electrode includes two consistent surveys of model to 30
High capacitance electrode 301, the i.e. parameters such as the material, size of electrode, thickness are all consistent.Two survey high capacitance electrodes 301 are symmetrical arranged
On the lateral wall of container 10, capacitor is formed.With reference to Fig. 2, container 10 is cylindrical shape, has three groups of survey high capacitance electrodes to 30, then
Every group of survey high capacitance electrode is surveyed central hub of the high capacitance electrodes 301 on barrel about container 10 to two of 30 and is symmetrically divided
Cloth.In Fig. 2, two survey high capacitance electrodes 3011 constitute one group of survey high capacitance, and two survey high capacitance electrodes 3012 constitute one group of survey
High capacitance, two survey high capacitance electrodes 3013 constitute one group of survey high capacitance.
Further, every group of survey high capacitance electrode is arranged from 10 bottom of container to 10 top sequence of container 30, and adjacent two
Group is surveyed high capacitance electrode and is overlapped to 30 in Partial Height, and the total height that capacitance electrode is measured after arrangement should be greater than or be equal to container 10
The possible maximum height of interior liquid 20, so as to measure the arbitrary height of liquid 20.It is measured using multiple measurement capacitors,
Keep measurement result more accurate.Preferably, it is parallel with the symmetry axis of container 10 to meet survey high capacitance electrode 30.
Capacitance type liquid level measuring device includes 10 bottom of container being arranged in, for calibrating 20 characteristic of liquid in the present embodiment
Calibration capacitance electrode 40 is needed when container 10 is vacant and is measured respectively to calibration capacitance electrode 40 when injecting liquid,
So as to later period use when being measured to liquid 20.
Capacitance type liquid level measuring device includes and surveys high capacitance electrode to 30 and the company of calibration capacitance electrode 40 in the present embodiment
It connects, convert digit chip 50 for receiving the capacitor of detection capacitance, capacitor converts digit chip 50 according to the capacitor received
Value calculates the height of liquid 20 in container 10.Preferably, capacitor converts digit chip 50 as EFM8SB10 single-chip microcontroller,
The structure and application method of EFM8SB10 single-chip microcontroller can refer to the prior art, and this embodiment is not repeated.
By implementing the present embodiment, by the liquid level in symmetrical capacitance measurement container, do not need to contact with liquid, if
It sets simply, measurement is convenient.
Second embodiment
With reference to Fig. 3, on the basis of first embodiment, capacitance type liquid level measuring device further includes and capacitor in the present embodiment
The connection of conversion digit chip 50, the display screen 60 for showing measurement gained 20 height value of liquid.Preferably, display screen 60 can make
With digital display tube, liquid crystal display etc..
The liquid height measured is directly displayed out by the present embodiment, and user is facilitated directly to be observed, and structure is simple,
It is easily achieved, does not need to send data to specialized computer and handled and shown, greatly save measurement cost.
3rd embodiment
With reference to Fig. 4, on the basis of the first embodiment or the second embodiment, capacitance type liquid level measuring device in the present embodiment
It further include connecting, with capacitor conversion digit chip 50 for sending the communication module for measuring gained 20 height value of liquid.Communicate mould
Block is wire communication module or wireless communication module 70；Wherein, wireless communication module 70 includes 3G wireless communication module, 4G is wireless
Communication module, 5G wireless communication module, Sub-G wireless module, zigbee wireless module, bluetooth module, one in WIFI module
Kind.
Preferably, communication module is SI4438 wireless communication chips or SI4463 wireless communication chips.
Module sends the liquid height measured to the present embodiment by wireless communication, do not need by conducting wire connection come
Data are acquired, so that the more convenient installation of measuring device and use.
Fourth embodiment
With reference to Fig. 5, capacitance type liquid level measuring method in the present embodiment, applied to above-mentioned capacitance type liquid level measuring device,
The connection relationship of capacitance type liquid level measuring device can parameter above-described embodiment.This method comprises:
S0, the calibration capacitance value that measurement measurement calibration capacitance electrode 40 after liquid is injected in container 10, according to calibration electricity
Capacitance obtains the attribute information of liquid, and attribute information is for determining following capacity area coefficient ks, it will be understood that different liquids pair
The attribute information answered is different, so the attribute information of liquid need to be measured in advance, guarantees to be converted to subsequent according to measurement capacitance
Accuracy when height.
S1, under 10 blank state of container measurement survey high capacitance electrode to 30 in survey high capacitance electrode 301 reference capacitance
Value Cbase；
S2, in container 10 place liquid 20 after measurement survey high capacitance electrode to 30 in survey high capacitance electrode 301 detection
Capacitance Crst；
S3, it is calculated according to following formula and surveys high capacitance electrode to the right opposite for surveying high capacitance electrode 301 and liquid 20 in 30
Product Slqd:
Crst=Cbase+kSlqd
Wherein k is capacity area coefficient, and capacity area coefficient is determined by the attribute of survey high capacitance electrode 301 and liquid.
S4, it sets and surveys high capacitance electrode to the capacitor width of high capacitance electrode 301 is surveyed in 30 as A, survey high capacitance electrode 301 is just
Height to liquid 20 is H, then
Slqd=A*H
S5,20 height of liquid is calculated according to the height H for surveying 301 face liquid 20 of high capacitance electrode, be calculated:
H=(Crst-Cbase)/kA
If 20 liquid level of liquid is parallel with the bottom of container 10, i.e., container 10 is placed vertically, thens follow the steps S1 to step S4,
Measuring high capacitance electrode is respectively H1 and H2 to the capacitor height of two survey high capacitance electrodes 301 in 30, and H1=H2；
It is H1 or H2 that 20 height of liquid is calculated in step S5.
If 20 liquid level of liquid and the bottom of container 10 are not parallel, i.e. 10 slant setting of container, S1 is thened follow the steps to step
S4, measuring high capacitance electrode is respectively H3 and H4 to the capacitor height of two survey high capacitance electrodes 301 in 30, and H3 ≠ H4,
Wherein,
H3=(Crst1-Cbase1)/k1A
H4=(Crst2-Cbase2)/k2A
Wherein Crst1The reference capacitance value that high capacitance electrode 301 measures, C are surveyed to survey high capacitance electrode to one in 30base1
The detection capacitance measured for the survey high capacitance electrode 301；Crst2To survey high capacitance electrode to 30 another survey high capacitance electrode
The 301 reference capacitance values measured, Cbase2The detection capacitance measured for the survey high capacitance electrode 301.K1 and k2 is capacity area
Coefficient.
It is H3+H4/2 that 20 height of liquid is calculated in step S5, i.e. 20 height of liquid are as follows:
[(Crst1-Cbase1)/k1A+(Crst2-Cbase2)/k2A]/2
By implementing the present embodiment, each survey high capacitance electrode 301 can independent measurement capacitance, and calculate corresponding
Liquid level；Corresponding liquid is measured respectively to two survey high capacitance electrodes 301 in 30 that is, surveying high capacitance electrode
Then face height calculates the average height of liquid level again according to two liquid levels.Pass through the liquid level in symmetrical capacitance measurement container
Highly, it does not need to contact with liquid, setting is simple, and measurement is convenient.And either whether container tilts, and can all accurately measure
Liquid level.
5th embodiment
With reference to Fig. 6, capacitance type liquid level measuring method is after step s 5 on the basis of fourth embodiment, in the present embodiment
Further include:
S6,20 height of liquid is shown by display screen 60.20 height of liquid measured is directly displayed out by the present embodiment,
Facilitate user to be directly observed, and have the advantages of simple structure and easy realization, does not need to send data to specialized computer and handled
And display, greatly save measurement cost.
Sixth embodiment
With reference to Fig. 7, capacitance type liquid level measuring method is after step s 5 on the basis of fourth embodiment, in the present embodiment
Further include:
S7,20 height of liquid is sent by communication module.Preferably, by wireless communication module 70 by liquid 20
Height is sent.Wireless communication module 70 include 3G wireless communication module, 4G wireless communication module, 5G wireless communication module,
One of Sub-G wireless module, zigbee wireless module, bluetooth module, WIFI module.Preferably, communication module is
SI4438 wireless communication chips.
Module sends the liquid height measured to the present embodiment by wireless communication, do not need by conducting wire connection come
Data are acquired, so that the more convenient installation of measuring device and use.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of the utility model.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Above embodiments are only to illustrate the technical ideas and features of the present invention, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the protection scope of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should belong to the utility model claims covers model
It encloses.
Claims (6)
1. a kind of capacitance type liquid level measuring device, including the container (10) for placing liquid, which is characterized in that further include:
At least one set surveys high capacitance electrode to (30), and the survey high capacitance electrode includes two survey high capacitance electrodes to (30)
(301), two survey high capacitance electrode (301) center symmetric settings are on the side wall of the container (10)；
It is arranged in the container (10) bottom, the calibration capacitance electrode (40) for calibrating characteristics of liquids；
(30) and the calibration capacitance electrode (40) are connect with the survey high capacitance electrode, the electricity for receiving detection capacitance
Hold conversion digit chip (50).
2. capacitance type liquid level measuring device according to claim 1, which is characterized in that the survey high capacitance electrode is to (30)
To be more than two, described in every group survey high capacitance electrode to (30) include the consistent survey high capacitance electrode (301) of two models, two
Survey high capacitance electrode (301) center symmetric setting is on the lateral wall of the container (10)；
To (30), from the container (10) bottom to container (10), top sequence arranges survey high capacitance electrode described in every group, and adjacent
Survey high capacitance electrode described in two groups is overlapped (30) in Partial Height.
3. capacitance type liquid level measuring device according to claim 1, which is characterized in that further include converting number with the capacitor
Word chip (50) connection, the display screen (60) for showing measurement gained liquid height value.
4. capacitance type liquid level measuring device according to claim 1, which is characterized in that further include converting number with the capacitor
Word chip (50) connection, the communication module for sending measurement gained liquid height value.
5. capacitance type liquid level measuring device according to claim 4, which is characterized in that the communication module is wire communication
Module or wireless communication module (70)；
The wireless communication module (70) includes 3G wireless communication module, 4G wireless communication module, 5G wireless communication module, Sub-
One of G communication module, zigbee communication module, bluetooth module, WIFI module.
6. capacitance type liquid level measuring device according to claim 4, which is characterized in that the capacitor converts digit chip
It (50) is EFM8SB10 single-chip microcontroller, the communication module is SI4438 wireless communication chips；
The container (10) is nonmetallic vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821866165.7U CN209296088U (en) | 2018-11-13 | 2018-11-13 | A kind of capacitance type liquid level measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821866165.7U CN209296088U (en) | 2018-11-13 | 2018-11-13 | A kind of capacitance type liquid level measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209296088U true CN209296088U (en) | 2019-08-23 |
Family
ID=67643693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821866165.7U Active CN209296088U (en) | 2018-11-13 | 2018-11-13 | A kind of capacitance type liquid level measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209296088U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443489A (en) * | 2018-11-13 | 2019-03-08 | 世强先进(深圳)科技股份有限公司 | A kind of capacitance type liquid level measuring device and method |
-
2018
- 2018-11-13 CN CN201821866165.7U patent/CN209296088U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443489A (en) * | 2018-11-13 | 2019-03-08 | 世强先进(深圳)科技股份有限公司 | A kind of capacitance type liquid level measuring device and method |
| WO2020098633A1 (en) * | 2018-11-13 | 2020-05-22 | 世强先进(深圳)科技股份有限公司 | Capacitive liquid level measurement device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109443489A (en) | A kind of capacitance type liquid level measuring device and method | |
| CN102997974B (en) | Adaptive capacitance liquid level meter | |
| CN200986461Y (en) | Intelligent capacitance type liquid level measuring apparatus | |
| CN105527501B (en) | A kind of micro capacitance method | |
| CN203396450U (en) | Novel capacitive sensor | |
| CN204758082U (en) | Intelligent drinking cup of non -contact level sensor and applied this sensor | |
| CN102096057B (en) | Calibration method and device of capacitance measurement circuit | |
| CN209296088U (en) | A kind of capacitance type liquid level measuring device | |
| CN104897239A (en) | Non-contact liquid level sensor and intelligent water cup comprising the same | |
| CN202631043U (en) | Formation gas volume measurement device of flexible package lithium ion battery | |
| CN203534673U (en) | Capacitance liquid level meter of real-time correction dielectric constant | |
| CN205879171U (en) | Static level gauge applied to liquid levels | |
| CN2177240Y (en) | Capacitance matter water content investigator | |
| CN104808261B (en) | Rainfall measurement sensor without mechanical structure | |
| CN103900512B (en) | Micrometric displacement marking apparatus and using method thereof | |
| CN205981364U (en) | Capacitive gauge | |
| CN204944489U (en) | A kind of four points of sphere capacitance level pick-up units | |
| CN108225480A (en) | Non-contact liquid volume measuring method based on linear type capacitive liquid level sensor | |
| CN103017864A (en) | Tubular three-electrode capacitive liquid level detection sensor and detection method | |
| CN104502678A (en) | Method for measuring voltage ratio of power transformer | |
| CN220853774U (en) | Capacitance type liquid level meter for oil tank | |
| CN113237526A (en) | Non-contact automatic measuring device and measuring method for volume and mass of liquid | |
| CN104977330A (en) | Soil volumetric water content measuring method based on one-chip microcomputer | |
| CN205449348U (en) | Sensor device | |
| CN206496815U (en) | Adjustable electric capacitance Capacitor-type Fuel Quantity Sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |