CN206114054U - High accuracy does not have line number word water depth sensor system for experiments - Google Patents
High accuracy does not have line number word water depth sensor system for experiments Download PDFInfo
- Publication number
- CN206114054U CN206114054U CN201620876578.8U CN201620876578U CN206114054U CN 206114054 U CN206114054 U CN 206114054U CN 201620876578 U CN201620876578 U CN 201620876578U CN 206114054 U CN206114054 U CN 206114054U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- sensor system
- depth sensor
- numeral
- wireless communication
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000002474 experimental method Methods 0.000 title claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 101150000595 CLMP gene Proteins 0.000 claims description 3
- 101100382322 Drosophila melanogaster Acam gene Proteins 0.000 claims description 3
- 239000003985 ceramic capacitor Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000002103 nanocoating Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract description 5
- 239000003643 water by type Substances 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a high accuracy does not have line number word water depth sensor system for experiments, including the host computer with from the machine, draw together sensing element, electric capacity digital analog conversion module and follow quick -witted wireless communication module from the press packed bale, sensing element passes through the capacitance value that parallel plate capacitor structure measurement was surveyed water to loop through electric capacity digital analog conversion module and give the host computer from quick -witted wireless communication module sent, the host computer is received from quick -witted wireless communication module sent's capacitor signal. The utility model has the advantages of as follows: measurement accuracy is high, and the measuring speed is fast to can be used for the depth of waters undulant, unstable rivers to survey, only there is a wire in contact with water, it is little to the rivers influence.
Description
Technical field
This utility model is related to public safety and hydro science field, and in particular to one kind experiment high precision wireless numeral water
Deep sensing system.
Background technology
Need to carry out the depth of water continuous, accurate measurement in many scientific experimentss (the especially field such as hydraulics).At present
Existing various water depth sensors cannot meet experiment demand sometimes.Traditional water level probe needs to realize surveying by mechanical movement
Amount, measuring speed is slow, and larger measurement error can be produced (such as rainfall simulation experiment) when water level fluctuation is larger.Ultrasonic liquid level is visited
Device limited precision is surveyed, is typically only capable of reaching centimetres, minority can reach millimeter magnitude, it is impossible to meet the requirement of accurate experiment.
Laser ranging detector precision itself is very high, but due to the transparency of water it is very high, it is bad for effect during water-depth measurement.Pressure type
Sensor is affected than larger by ambient temperature and air pressure, therefore limited precision, and is unsatisfactory for static pressure distribution at some
Using causing measuring error, (such as raindrop can cause extra surge in rainfall simulation experiment, cause pressure sensing under occasion
The anti-depth of water for pushing away of device measured value is bigger than normal).Condenser type water depth sensor needs contact measurement, may in the experiment of water flowing is related to
Flow field is affected, also extra error can be produced because of contact angle hysteretic phenomenon.Also there are other in the water depth sensor that in addition, there will be
Shortcoming.At present major part water depth sensor all exports analogue signal, needs to carry out analog digital conversion that computer could be connected and realizes number
According to automatic data collection and process, second order error is inevitably resulted from analog-digital conversion process.And, analogue signal is in longer-range
Easily it is interfered in transmitting procedure, causes corrupt data.To solve these problems, water depth sensor is needed to realize numeral
Change.In some large-scale hydraulic experiments, need to arrange big quantity sensor in tank diverse location and carry out data acquisition simultaneously.It is existing
Have water depth sensor more and adopt wire transmission mode, need to lay a large amount of cables, waste time and energy, while experimenter may be given
Cause potential safety hazard (being tripped by cable).In addition, the experiment that some needs are carried out in closed environment is (if desired in high pressure/low
The experiment carried out under the specific conditions such as pressure) do not allow to draw cable or draw cable that engineering difficulty can be improved.To solve these
Problem, needs water depth sensor to realize wireless penetration.
Utility model content
This utility model is intended at least solve one of above-mentioned technical problem.
For this purpose, a purpose of the present utility model is to propose a kind of experiment high precision wireless numeral water depth sensor system
System.
To achieve these goals, embodiment of the present utility model discloses a kind of experiment high precision wireless numeral depth of water
Sensing system, including：Slave, the slave includes sensing element, electric capacity D/A converter module and slave wireless communication module,
The sensing element includes insulating vessel, the metallic plate being fixed on the insulating vessel outer wall and inserts in the insulating vessel
The tinsel in portion, described one end wiry is less than predeterminable range, the tinsel and institute apart from the insulating vessel inner bottom wall
State metallic plate to be connected with the electric capacity D/A converter module；The electric capacity D/A converter module and the slave radio communication mold
Block；Main frame, the main frame includes hosi wireless communication module and computer, the hosi wireless communication module and the slave without
Line communication module is communicated to connect.
According to the experiment high precision wireless numeral water depth sensor system of this utility model embodiment, certainty of measurement is high,
Measuring speed is fast, and can be used for fluctuation, the water depth detection of unstable current；Only an one metal wire is contacted with water, to water
Stream affects little.
In addition, according to the experiment high precision wireless numeral water depth sensor system of this utility model above-described embodiment, going back
There can be following additional technical characteristic：
Further, with the medial wall of the insulating vessel of the metallic plate correspondence position on be coated with hydrophobic apply
Layer.
Further, the hydrophobic coat is SiO2Nano coating.
Further, the metallic plate is copper plate.
Further, the predeterminable range is 5mm.
Further, the electric capacity D/A converter module includes reference capacitance and electric capacity numeral conversion chip, the metal
Silk and the metallic plate with the electric capacity numeral conversion chip be connected, the reference capacitance be leaded multilayer ceramic capacitor, the electric capacity number
Word conversion chip is the PCAP01 electric capacity numeral conversion chip of German acam companies.
Additional aspect of the present utility model and advantage will be set forth in part in the description, partly will be from explained below
In become obvious, or by it is of the present utility model practice recognize.
Description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will from the description with reference to accompanying drawings below to embodiment
Become obvious and easy to understand, wherein：
Fig. 1 is that the structure of the experiment high precision wireless numeral water depth sensor system of this utility model one embodiment is shown
It is intended to；
Fig. 2 is the structural representation of the sensing element of this utility model one embodiment；
Fig. 3 is the electrical block diagram of the slave of this utility model one embodiment；
Fig. 4 is the electrical block diagram of the main frame of this utility model one embodiment；
Fig. 5 is the test result figure of this utility model one embodiment.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio
Same or similar element is represented to same or similar label eventually or the element with same or like function.Below by ginseng
The embodiment for examining Description of Drawings is exemplary, is only used for explaining this utility model, and it is not intended that to of the present utility model
Limit.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " on ", D score,
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward " is
Based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplifies description, rather than indicates
Or the device or element of hint indication with specific orientation, with specific azimuth configuration and operation, therefore must not be understood that
It is to restriction of the present utility model.Additionally, term " first ", " second " be only used for describe purpose, and it is not intended that indicate or
Hint relative importance.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly
Connection；Can be mechanically connected, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in this utility model.
With reference to explained below and accompanying drawing, it will be clear that these and other aspects of embodiment of the present utility model.At these
In description and accompanying drawing, some particular implementations in embodiment of the present utility model are specifically disclosed to represent and implement this reality
With some modes of the principle of new embodiment, but it is to be understood that the scope of embodiment of the present utility model is not limited
System.Conversely, embodiment of the present utility model includes all changes fallen in the range of the spirit and intension of attached claims
Change, change and equivalent.
Below in conjunction with Description of Drawings according to the experiment of this utility model embodiment high precision wireless numeral water depth sensor
System.
Refer to Fig. 1, one kind experiment high precision wireless numeral water depth sensor system, including slave and main frame.Please join
Fig. 2 is examined, slave includes sensing element 103, electric capacity D/A converter module 104 and slave wireless communication module 105.Main frame includes master
Machine wireless communication module 101 and computer 102.
Fig. 2 is refer to, sensing element 103 includes insulating vessel 107, the metallic plate being fixed on the outer wall of insulating vessel 107
108 and insertion insulating vessel 107 inside tinsel 109.One end of tinsel 109 is less than apart from the inner bottom wall of insulating vessel 107
Predeterminable range.
Specifically, metallic plate 108 is pasted onto the side-wall outer side of insulating vessel 107, forms a pole plate；Tinsel 109 is inserted
Near diapire in insulating vessel 107, and the tested water imported in insulating vessel 107 forms another pole plate；Thus, metallic plate
108th, tinsel 109 and tested water define a plane-parallel capacitor, and insulating vessel 107 constitutes capacitor dielectric.In the depth of water not
In the case of being very little (less than 5mm), capacitance and the depth of water of the electric capacity are in significant linear function relation, therefore can be with electricity consumption
Capacitance reflects the depth of water.
Electric capacity D/A converter module 104 is connected with tinsel 109 and metallic plate 108, by tinsel 109 and metallic plate 108
Between capacitance be converted to electric capacity digital signal, and electric capacity digital signal is sent to into slave wireless communication module 105.
Electric capacity digital signal is sent to hosi wireless communication module 105, main frame channel radio by slave wireless communication module 105
Electric capacity digital signal is passed to computer 102 by letter module 105, computer 102 can be combined with other devices finally draw it is tested
The depth of water of water.
In one embodiment of the present utility model, in the medial wall with the insulating vessel 107 of the correspondence position of metallic plate 108
On be coated with hydrophobic coat 111, the extra error produced with reducing contact angle hysteretic phenomenon.Preferably, hydrophobic coat 111 is
SiO2Nano coating, the extra error that can greatly reduce contact angle hysteretic phenomenon and produce.
In one embodiment of the present utility model, metallic plate 108 is copper plate, and copper plate conducts electricity very well, and is lifted and is surveyed
Accuracy of measurement.
In one embodiment of the present utility model, (lower end of tinsel 109 is in insulating vessel 107 for predeterminable range
The distance of diapire) it is 5mm, it should be noted that and the lower end of tinsel 109 can also contact the inner bottom wall of insulating vessel 107.
Fig. 3 is refer to, in one embodiment of the present utility model, electric capacity data-converting block 104 includes reference capacitance
113 and electric capacity numeral conversion chip 112.Slave wireless communication module 105 includes radio communication single-chip microcomputer 114, antenna 115 and auxiliary
Help element 116.Slave also includes power module 106, and power module 106 includes battery case 117, switch 118, Voltage stabilizing module 119
With Voltage stabilizing module 120.Wherein, electric capacity numeral conversion chip 112 is respectively at sensing element 103, reference capacitance 113, radio communication
Single-chip microcomputer 114 and Voltage stabilizing module 119 connect.In an example of the present utility model, electric capacity numeral conversion chip 112 adopts moral
The PCAP01 electric capacity numeral conversion chip of acam companies of state, the chip can measure the capacitance of capacitor and directly obtain numeral
Amount.Reference capacitance 113 adopts leaded multilayer ceramic capacitor to reduce noise as far as possible.Auxiliary element 116 is respectively at radio communication single-chip microcomputer
114th, antenna 115 and Voltage stabilizing module 120 connect.Radio communication single-chip microcomputer 114 is using TexasInstruments companies of the U.S.
SOC(system on a chip) that CC2530 is wireless (SoC) solution, the chip can realize Zigbee wireless communication functions.By software
Programming, radio communication single-chip microcomputer 114 can manipulate electric capacity numeral conversion chip 112 and carry out capacitance measurement, read measurement data simultaneously
Main frame is sent to by antenna 115.Auxiliary element 116 is including crystal oscillator etc., it is ensured that the normal work of single-chip microcomputer 114 and antenna 115,
Also LED is used to indicate the working condition of single-chip microcomputer.Power module 106 includes battery case 117, switch 118 and voltage stabilizing mould
Block 119 and 120, is that electric capacity data-converting block 104, slave wireless communication module 105 provide stable power supply.
Fig. 4 is refer to, in one embodiment of the present utility model, hosi wireless communication module 101 includes radio communication
Single-chip microcomputer 117, antenna 118, auxiliary element 119, serial ports turn USB chips 120 and usb 1 21.Wherein, antenna 118 is used to connect
The electric capacity digital signal that the antenna 115 in slave wireless communication module 105 sends is received, and this electric capacity digital signal is passed sequentially through
Serial ports turns USB chips 120 and usb 1 21 sends computer 102.Computer 102 is carried out according to the electric capacity digital signal for receiving
Calculate, finally give the depth of water of tested water.
In an example of the present utility model, different amounts of water is injected in insulating vessel 107, filled with this utility model
Put and sound the depth of the water, while the method weighed with precision electronic balance accurately obtains the actual depth of water in container, the two is contrasted,
Measurement result is as shown in figure 5, in all tests, mean error only 0.27mm, maximum error also only has 0.71mm.
The experiment of this utility model embodiment high precision wireless numeral water depth sensor system, with advantages below：
1st, retain the advantage of electric capacity detectoscope, certainty of measurement is high, measuring speed is fast, and can be used for fluctuation, no
The water depth detection of stationary flow；
2nd, only have an one metal wire to contact with water, it is little to water currents；
3rd, hydrophobic coating is used, the extra error for reducing contact angle hysteretic phenomenon and producing；
4th, sensor height digitized, it is to avoid the unnecessary error that interference and analog digital conversion are caused；
5th, sensor wireless, saves the trouble of laying cable, and can be by way of a main frame multiple stage slave
The bathymetric data of multiple positions is measured simultaneously；
6th, can easily be obtained and storage sensor real time data by the software kit on computer, it might even be possible to enter
Capable some simple data processings.This utility model high precision, measuring speed little to current inhibition are fast, altitude figure,
Can realize that data are wirelessly transferred, the bathymetric data collection that it can be used in the related experiments such as hydraulics.
In addition, the experiment of this utility model embodiment with high precision wireless numeral water depth sensor system other constitute with
And effect is all for a person skilled in the art known, in order to reduce redundancy, is not repeated.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can be
Combine in an appropriate manner in any one or more embodiments or example.
While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that：
In the case of without departing from principle of the present utility model and objective various changes, modification, replacement can be carried out to these embodiments
And modification, scope of the present utility model is by claim and its is equal to limit.
Claims (6)
1. it is a kind of to test with high precision wireless numeral water depth sensor system, it is characterised in that to include：
Slave, the slave includes sensing element, electric capacity D/A converter module and slave wireless communication module, the sensing element
Including the tinsel inside insulating vessel, the metallic plate being fixed on the insulating vessel outer wall and the insertion insulating vessel,
Described one end wiry is less than predeterminable range apart from the insulating vessel inner bottom wall, the tinsel and the metallic plate with
The electric capacity D/A converter module connection；The electric capacity D/A converter module and the slave wireless communication module；
Main frame, the main frame includes hosi wireless communication module and computer, the hosi wireless communication module and the slave
Wireless communication module is communicated to connect.
2. experiment according to claim 1 high precision wireless numeral water depth sensor system, it is characterised in that with institute
Hydrophobic coat is coated with the medial wall of the insulating vessel for stating metallic plate correspondence position.
3. it is according to claim 2 to test with high precision wireless numeral water depth sensor system, it is characterised in that described to hate
Water coating is SiO2Nano coating.
4. it is according to claim 1 to test with high precision wireless numeral water depth sensor system, it is characterised in that the gold
Category plate is copper plate.
5. it is according to claim 1 to test with high precision wireless numeral water depth sensor system, it is characterised in that described pre-
If distance is 5mm.
6. the high precision wireless numeral water depth sensor system of the experiment according to claim 1 or 4, it is characterised in that institute
Electric capacity D/A converter module is stated including reference capacitance and electric capacity numeral conversion chip, the tinsel and the metallic plate are and institute
Electric capacity numeral conversion chip connection is stated, the reference capacitance is leaded multilayer ceramic capacitor, the electric capacity numeral conversion chip is Germany acam
The PCAP01 electric capacity numeral conversion chip of company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620876578.8U CN206114054U (en) | 2016-08-12 | 2016-08-12 | High accuracy does not have line number word water depth sensor system for experiments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620876578.8U CN206114054U (en) | 2016-08-12 | 2016-08-12 | High accuracy does not have line number word water depth sensor system for experiments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206114054U true CN206114054U (en) | 2017-04-19 |
Family
ID=58512472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620876578.8U Active CN206114054U (en) | 2016-08-12 | 2016-08-12 | High accuracy does not have line number word water depth sensor system for experiments |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206114054U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092263A (en) * | 2016-08-12 | 2016-11-09 | 清华大学 | A kind of experiment high precision wireless numeral water depth sensor system |
-
2016
- 2016-08-12 CN CN201620876578.8U patent/CN206114054U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092263A (en) * | 2016-08-12 | 2016-11-09 | 清华大学 | A kind of experiment high precision wireless numeral water depth sensor system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205228375U (en) | Experimental lining deformation monitoring devices of tunnel model | |
| CN102072925A (en) | Stroma moisture and conductivity in situ detector and method for determining salinity | |
| CN210234707U (en) | Novel alternating-current charging stake convenient to carry out quantity value traceability | |
| CN202229811U (en) | Integrated instrument for detecting water level and well depth | |
| CN201787998U (en) | Portable electronic water-level water thermometer | |
| CN206114054U (en) | High accuracy does not have line number word water depth sensor system for experiments | |
| CN204612780U (en) | A kind of low-temperature liquid level measuring system | |
| CN201974399U (en) | Matrix humidity and conductivity in-situ detector | |
| CN106092263A (en) | A kind of experiment high precision wireless numeral water depth sensor system | |
| CN103389138A (en) | Weighing type liquid level meter system based on MSP430 (Mixed Signal Processor 430) single chip microcomputer | |
| CN206281739U (en) | A kind of novel intelligent penetron | |
| CN201255648Y (en) | Liquid level detecting device | |
| CN203929561U (en) | Portable solid penetron | |
| CN205940696U (en) | High accuracy digitization is from dynamic water level test system for experiments | |
| CN105004400A (en) | Simple underground water level measuring device and measuring method | |
| CN113237526A (en) | Non-contact automatic measuring device and measuring method for volume and mass of liquid | |
| CN202793451U (en) | Portable single-well automatic metering device | |
| CN207688964U (en) | A kind of automobile and engineering machinery pressure resistance type high-precision fuel-quantity transducer | |
| CN201965112U (en) | High-precision seawater salinity measuring device | |
| CN206161821U (en) | Many states battery power measuring instrument | |
| CN206725590U (en) | A kind of double-deck automatic detection test tube | |
| CN204242815U (en) | Polar plate spacing can measure formula capacitor | |
| CN2911615Y (en) | Graduated cylinder | |
| CN112212946A (en) | High-precision electronic water gauge | |
| CN218492022U (en) | Detergent liquid level height detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |