CN106289448A - A kind of Level Detection prior-warning device - Google Patents
A kind of Level Detection prior-warning device Download PDFInfo
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- CN106289448A CN106289448A CN201510317332.7A CN201510317332A CN106289448A CN 106289448 A CN106289448 A CN 106289448A CN 201510317332 A CN201510317332 A CN 201510317332A CN 106289448 A CN106289448 A CN 106289448A
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- sensing probe
- capacitive sensing
- capacitive
- warning device
- voltage signal
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 239000000523 sample Substances 0.000 claims abstract description 46
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 230000009916 joint effect Effects 0.000 claims abstract description 7
- 238000000151 deposition Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 2
- 230000001934 delay Effects 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000006124 Pilkington process Methods 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The present invention relates to a kind of Level Detection prior-warning device, it is made up of capacitive sensing probe and testing circuit, described testing circuit includes capacitive divider, rectifier filter, single-chip microcomputer, system control cpu, the electric capacity that described capacitive sensing probe detects and the reference capacitance joint effect in capacitive divider are by the fixed frequency square-wave signal of SCM PWM input to capacitive divider, square-wave signal inputs after capacitive divider to rectifier filter again and obtains voltage signal, voltage signal inputs to single-chip microcomputer again, A/D converter within single-chip microcomputer utilization inputs to system control cpu after being acquired voltage signal processing, described capacitive sensing probe is that hollow is arranged in the container depositing liquid reagent, distal portion is close to container bottom.Technical solution of the present invention effectively reduces the complexity of device.
Description
Technical field
The present invention relates to a kind of Level Detection prior-warning device, particularly in a kind of automatic clinical chemistry analyzer
Level Detection prior-warning device.
Background technology
When in detection field, Automatic analyzer, reagent carries out biochemical reaction, for ensureing that reaction has in time
Effect is carried out, and is necessary for supplementing enough reaction reagents at any time, the most effectively detects level change
Become the key of technology.
The technology being currently used for level detection has float method, supersonic reflection method, electrical conductivity method, capacitance method
Deng.Wherein float-type transmitter volume is big, and supercritical ultrasonics technology cost is high, and electrical conductivity method is easily subject to different batches
The impact of the factors such as secondary liquid reagent dielectric constant and environment temperature and humidity, prior art mainly uses electricity
The method of appearance formula liquid level sensing carries out level detection, and patent CN201010193016.0 discloses a kind of electric capacity
The reagent surplus detection of formula and prior-warning device, the pipette of device and probe, as two parts, are respectively taken charge of
Its duty, device complexity is higher, adds the volume of device.
Summary of the invention
For solving above-mentioned technical problem, the invention provides a kind of Level Detection prior-warning device, it is by electric capacity
Formula pickup probe and testing circuit composition, described testing circuit include capacitive divider, rectifier filter,
In single-chip microcomputer, system control cpu, the electric capacity that described capacitive sensing probe detects and capacitive divider
Reference capacitance joint effect by SCM PWM input to the fixed frequency square-wave signal of capacitive divider,
Square-wave signal inputs after capacitive divider again and obtains voltage signal to rectifier filter, and voltage signal is the most defeated
Entering to single-chip microcomputer, the A/D converter within single-chip microcomputer utilization inputs after being acquired voltage signal processing
To system control cpu, described capacitive sensing probe is that hollow is arranged in the container depositing liquid reagent,
Distal portion is close to container bottom.
Described capacitive sensing probe end position is set to insulation.
Described capacitive sensing probe is by probe end splicing insulant or plating at probe end
Distal portion is set to insulation by the method for insulating coating.
Preferably, capacitive sensing probe end insulant is plastics or pottery.
Preferably, capacitive sensing probe end insulating coating is Teflon coating.
Described fixed frequency square-wave signal is 100～500KHz.
The method that present invention also offers the detection of a kind of Level Detection prior-warning device, during work, along with reagent
Consuming liquid level constantly to reduce, the electric capacity that capacitive sensing probe in detecting arrives is slowly varying, when reagent liquid level drops
As little as capacitive sensing probe insulation position time, capacitive sensing probe in detecting to capacitance can produce one
Individual saltus step, capacitive sensing probe detect reference capacitance joint effect in electric capacity and capacitive divider by
SCM PWM inputs the square-wave signal to capacitive divider, and square-wave signal is amplitude after capacitive divider
Change, then input to rectifier filter and be converted into voltage signal, voltage signal inputs to single-chip microcomputer again,
Single-chip microcomputer utilizes internal A/D converter to input after being acquired voltage signal processing to CPU to control and is
System, is provided information warning by CPU, reminds user's liquid make-up reagent.
The Level Detection prior-warning device of the present invention, capacitive sensing probe is set to hollow structure, makees simultaneously
For the path of liquid reagent flowing, effectively reduce the complexity of device, and by capacitive sensing probe
The material of main body section and distal portion is distinguish between, and when liquid level is reduced to insulate position, detects
Capacitance can produce saltus step, and testing circuit capture change also provides information warning, accurately to remind user to mend
Fill liquid reagent, avoid sucking air during reagent reacting simultaneously, cause the leakage of reagent to add or add less.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of Level Detection prior-warning device of the present invention.
Detailed description of the invention
The present invention is described in more detail below in conjunction with the accompanying drawings, but is not used to limit the present invention.
Embodiment 1
Level Detection prior-warning device, as it is shown in figure 1, be made up of capacitive sensing probe and testing circuit,
Testing circuit includes capacitive divider, rectifier filter, single-chip microcomputer, system control cpu, and condenser type passes
The electric capacity that sense probe detects is defeated by SCM PWM with the reference capacitance joint effect in capacitive divider
Entering the fixed frequency square-wave signal to capacitive divider, square-wave signal inputs to the most whole after capacitive divider again
Stream wave filter obtains voltage signal, and voltage signal inputs to single-chip microcomputer, the A/D within single-chip microcomputer utilization again
Transducer inputs to system control cpu after being acquired voltage signal processing, and capacitive sensing probe sets
Put in the container depositing liquid reagent, for reducing device complexity, capacitive sensing probe is set to
Hollow, simultaneously as the path of liquid reagent flowing.
For sucking air during preventing reagent reacting, the leakage of reagent is caused to add or add less, by Level Detection
The capacitive sensing probe end position of prior-warning device is set to insulation, and main body section and distal portion are from material
Material is distinguish between, and when liquid reagent is reduced to insulate position, the capacitance detected can produce saltus step,
Testing circuit capture change also provides information warning.
The distal portion of capacitive sensing probe does insulation processing by two kinds of methods, is respectively by visiting
Pin terminal splice insulant or plate insulating coating at probe end, the preferred plastics of insulant or pottery,
Insulating coating preferred Teflon coating.
Embodiment 2
In Automatic analyzer work process, constantly reduce along with reagent consumes liquid level, capacitive sensing
The electric capacity that probe in detecting arrives is slowly varying, when reagent liquid level is reduced to capacitive sensing probe insulation position,
Capacitive sensing probe in detecting to capacitance can produce saltus step.
The fixed frequency square-wave signal of SCM PWM output 100～500KHz is to capacitive divider, electricity
Hold the reference capacitance in potentiometer and electric capacity joint effect that capacitive sensing probe detects inputs to electric capacity
Square-wave signal in potentiometer, square-wave signal amplitude after capacitive divider changes, then input to
Being converted into voltage signal after rectifier filter, voltage signal inputs to single-chip microcomputer again, and single-chip microcomputer utilizes internal
A/D converter voltage signal is acquired process after input to system control cpu, CPU give
Go out information warning, remind user's liquid make-up reagent.The computing formula of square-wave signal amplitude change is:
AConvert amplitude=CReference capacitance/(CReference capacitance+CProbe)×AOriginal amplitude
When capacitive sensing probe detect reagent liquid level drop to probe insulation position time, probe detects
Electric capacity increases rapidly, and after the conversion that prior-warning device detects, the amplitude of square-wave signal increases the most therewith, works as increasing
It is added to Level Detection prior-warning device threshold value set in advance, i.e. AConvert amplitude＜ AThreshold value, prior-warning device will be given
Go out information warning.
Claims (7)
1. a Level Detection prior-warning device, it is characterised in that by capacitive sensing probe and testing circuit group
Becoming, described testing circuit includes capacitive divider, rectifier filter, single-chip microcomputer, system control cpu,
The electric capacity that described capacitive sensing probe detects and the reference capacitance joint effect in capacitive divider are by list
Sheet machine PWM inputs the fixed frequency square-wave signal to capacitive divider, and square-wave signal is through capacitive divider
After input again to rectifier filter and obtain voltage signal, voltage signal inputs to single-chip microcomputer, single-chip microcomputer profit again
Input to system control cpu after being acquired processing to voltage signal with internal A/D converter, described
Capacitive sensing probe is that hollow is arranged in the container depositing liquid reagent, and distal portion is close to container bottom
Portion.
2. Level Detection prior-warning device as claimed in claim 1, it is characterised in that described capacitive sensing
Probe end position is set to insulation.
3. Level Detection prior-warning device as claimed in claim 2, it is characterised in that described capacitive sensing
Probe is by probe end splicing insulant or plating the method for insulating coating by end at probe end
Position, end is set to insulation.
4. Level Detection prior-warning device as claimed in claim 3, it is characterised in that described capacitive sensing
Probe end insulant is plastics or pottery.
5. Level Detection prior-warning device as claimed in claim 3, it is characterised in that described capacitive sensing
Probe end insulating coating is Teflon coating.
6. the Level Detection prior-warning device as described in any one of claim 1-5, it is characterised in that described solid
Determining frequency square wave signal is 100～500KHz.
7. the method detecting liquid level with the Level Detection prior-warning device described in any one of 1-6, its feature
When being work, constantly reducing along with reagent consumes liquid level, the electric capacity that capacitive sensing probe in detecting arrives delays
Slow change, when reagent liquid level is reduced to capacitive sensing probe insulation position, capacitive sensing probe is examined
The capacitance measured can produce a saltus step, and capacitive sensing probe detects in electric capacity and capacitive divider
Reference capacitance joint effect believed by SCM PWM input to the square-wave signal of capacitive divider, square wave
Amplitude change number after capacitive divider, then input to rectifier filter and be converted into voltage signal, voltage
Signal inputs to single-chip microcomputer again, and the A/D converter within single-chip microcomputer utilization is acquired place to voltage signal
Input after reason to system control cpu, CPU provide information warning, remind user's liquid make-up reagent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510317332.7A CN106289448A (en) | 2015-06-11 | 2015-06-11 | A kind of Level Detection prior-warning device |
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| CN201510317332.7A CN106289448A (en) | 2015-06-11 | 2015-06-11 | A kind of Level Detection prior-warning device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989793A (en) * | 2017-04-28 | 2017-07-28 | 中航工业南航（深圳）测控技术有限公司 | Sample circuit and detection means |
| CN107328696A (en) * | 2017-01-11 | 2017-11-07 | 江苏省交通科学研究院有限公司 | A kind of novel road-face creepage instrument and its measuring method |
| CN110736519A (en) * | 2019-11-28 | 2020-01-31 | 珠海格力电器股份有限公司 | Liquid level detection method, liquid level detection device and household appliance |
| CN114569009A (en) * | 2022-03-03 | 2022-06-03 | 深圳市优必选科技股份有限公司 | Water tank water level detection equipment and robot of sweeping floor |
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|---|---|---|---|---|
| JPS63210627A (en) * | 1987-02-26 | 1988-09-01 | Shikoku Kakoki Co Ltd | Liquid-level meter |
| US5493922A (en) * | 1993-07-09 | 1996-02-27 | Akzo N.V. | Liquid level sensing probe and control circuit |
| CN201467099U (en) * | 2009-06-08 | 2010-05-12 | 深圳市鑫汇科科技有限公司 | Capacitive sensing key circuit and keyboard |
| CN101900596A (en) * | 2010-06-04 | 2010-12-01 | 深圳市新产业生物医学工程有限公司 | Reagent warning device for chemiluminescent immunoassay |
| CN101975603A (en) * | 2010-10-27 | 2011-02-16 | 长沙开元仪器股份有限公司 | Liquid level detector |
| CN103278211A (en) * | 2013-05-10 | 2013-09-04 | 重庆南方数控设备有限责任公司 | Capacitive type liquid level detection device and method |
| CN204679150U (en) * | 2015-06-11 | 2015-09-30 | 北京勤邦生物技术有限公司 | A kind of level sensing prior-warning device |
-
2015
- 2015-06-11 CN CN201510317332.7A patent/CN106289448A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63210627A (en) * | 1987-02-26 | 1988-09-01 | Shikoku Kakoki Co Ltd | Liquid-level meter |
| US5493922A (en) * | 1993-07-09 | 1996-02-27 | Akzo N.V. | Liquid level sensing probe and control circuit |
| CN201467099U (en) * | 2009-06-08 | 2010-05-12 | 深圳市鑫汇科科技有限公司 | Capacitive sensing key circuit and keyboard |
| CN101900596A (en) * | 2010-06-04 | 2010-12-01 | 深圳市新产业生物医学工程有限公司 | Reagent warning device for chemiluminescent immunoassay |
| CN101975603A (en) * | 2010-10-27 | 2011-02-16 | 长沙开元仪器股份有限公司 | Liquid level detector |
| CN103278211A (en) * | 2013-05-10 | 2013-09-04 | 重庆南方数控设备有限责任公司 | Capacitive type liquid level detection device and method |
| CN204679150U (en) * | 2015-06-11 | 2015-09-30 | 北京勤邦生物技术有限公司 | A kind of level sensing prior-warning device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328696A (en) * | 2017-01-11 | 2017-11-07 | 江苏省交通科学研究院有限公司 | A kind of novel road-face creepage instrument and its measuring method |
| CN107328696B (en) * | 2017-01-11 | 2023-09-05 | 广东惠和工程检测有限公司 | Novel pavement water seepage instrument and measuring method thereof |
| CN106989793A (en) * | 2017-04-28 | 2017-07-28 | 中航工业南航（深圳）测控技术有限公司 | Sample circuit and detection means |
| CN110736519A (en) * | 2019-11-28 | 2020-01-31 | 珠海格力电器股份有限公司 | Liquid level detection method, liquid level detection device and household appliance |
| CN114569009A (en) * | 2022-03-03 | 2022-06-03 | 深圳市优必选科技股份有限公司 | Water tank water level detection equipment and robot of sweeping floor |
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Inventor after: Wu Xiaosheng Inventor after: Long Guangzong Inventor after: He Fangyang Inventor after: Zhao Zhengmiao Inventor after: Wan Yuping Inventor before: Jiang Jinfeng Inventor before: Zhang Ying Inventor before: Nie Wenying Inventor before: Wu Xiaosheng Inventor before: Long Guangzong Inventor before: He Fangyang |
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