CN204679150U - A kind of level sensing prior-warning device - Google Patents
A kind of level sensing prior-warning device Download PDFInfo
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- CN204679150U CN204679150U CN201520399282.7U CN201520399282U CN204679150U CN 204679150 U CN204679150 U CN 204679150U CN 201520399282 U CN201520399282 U CN 201520399282U CN 204679150 U CN204679150 U CN 204679150U
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Abstract
The utility model relates to a kind of level sensing prior-warning device, be made up of capacitive sensing probe and testing circuit, described testing circuit comprises capacitive divider, rectifier filer, single-chip microcomputer, system control cpu, reference capacitance joint effect in the electric capacity that described capacitive sensing probe detects and capacitive divider is inputed to the fixed frequency square-wave signal of capacitive divider by SCM PWM, square-wave signal inputs to rectifier filer again and obtains voltage signal after capacitive divider, voltage signal inputs to single-chip microcomputer again, single-chip microcomputer inputs to system control cpu after utilizing inner A/D converter to carry out acquisition process to voltage signal, described capacitive sensing probe is that hollow is arranged on and deposits in the container of liquid reagent, distal portion is close to container bottom.Technical solutions of the utility model effectively reduce the complicacy of device.
Description
Technical field
The utility model relates to a kind of level sensing prior-warning device, particularly level sensing prior-warning device in a kind of automatic clinical chemistry analyzer.
Background technology
At detection field, when reagent carries out biochemical reaction in Automatic analyzer, carrying out, just must supplement enough reaction reagents at any time for ensureing that reaction is timely and effective, therefore how immediately effective detection level change becomes the key of technology.
Technology at present for level detection has float method, supersonic reflection method, electrical conductivity method, capacitance method etc.Wherein float-type transmitter volume is large, supercritical ultrasonics technology cost is high, electrical conductivity method is easily subject to the impact of the factors such as different batches liquid reagent specific inductive capacity and environment temperature and humidity, the method that prior art mainly adopts capacitance level to respond to carries out level detection, patent CN201010193016.0 discloses a kind of capacitive reagent surplus and detects and prior-warning device, and the pipette of device and probe are as two parts, and Each performs its own functions, device complexity is higher, adds the volume of device.
Utility model content
For solving the problems of the technologies described above, the utility model provides a kind of level sensing prior-warning device, it is made up of capacitive sensing probe and testing circuit, described testing circuit comprises capacitive divider, rectifier filer, single-chip microcomputer, system control cpu, reference capacitance joint effect in the electric capacity that described capacitive sensing probe detects and capacitive divider is inputed to the fixed frequency square-wave signal of capacitive divider by SCM PWM, square-wave signal inputs to rectifier filer again and obtains voltage signal after capacitive divider, voltage signal inputs to single-chip microcomputer again, single-chip microcomputer inputs to system control cpu after utilizing inner A/D converter to carry out acquisition process to voltage signal, described capacitive sensing probe is that hollow is arranged on and deposits in the container of 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 distal portion being set to insulation at probe end splicing insulating material or the method that plates insulating coating at probe end.
Preferably, capacitive sensing probe end insulating material is plastics or pottery.
Preferably, capacitive sensing probe end insulating coating is Teflon coating.
Described fixed frequency square-wave signal is 100 ~ 500KHz.
The utility model additionally provides a kind of method that level sensing prior-warning device detects, during work, constantly reduce along with reagent consumes liquid level, capacitive sensing probe in detecting to electric capacity slowly change, when reagent liquid level is reduced to capacitive sensing probe insulation position, capacitive sensing probe in detecting to capacitance can produce a saltus step, the capacitive sensing probe reference capacitance joint effect detected in electric capacity and capacitive divider is inputed to the square-wave signal of capacitive divider by SCM PWM, square-wave signal is amplitude change after capacitive divider, voltage signal is converted into after inputing to rectifier filer again, voltage signal inputs to single-chip microcomputer again, single-chip microcomputer inputs to system control cpu after utilizing inner A/D converter to carry out acquisition process to voltage signal, information warning is provided by CPU, reminding user liquid make-up reagent.
Level sensing prior-warning device of the present utility model, capacitive sensing probe is set to hollow structure, simultaneously as the path of liquid reagent flowing, the complicacy of effective reduction device, and the main body section of capacitive sensing probe and the material of distal portion are distinguished, when liquid level is reduced to insulation position, the capacitance detected can produce saltus step, testing circuit is caught and is changed and provide information warning, with accurate reminding user liquid make-up 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 the utility model level sensing prior-warning device.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described, but be not used for limiting the utility model.
Embodiment 1
Level sensing prior-warning device, as shown in Figure 1, be made up of capacitive sensing probe and testing circuit, testing circuit comprises capacitive divider, rectifier filer, single-chip microcomputer, system control cpu, reference capacitance joint effect in the electric capacity that capacitive sensing probe detects and capacitive divider is inputed to the fixed frequency square-wave signal of capacitive divider by SCM PWM, square-wave signal inputs to rectifier filer again and obtains voltage signal after capacitive divider, voltage signal inputs to single-chip microcomputer again, single-chip microcomputer inputs to system control cpu after utilizing inner A/D converter to carry out acquisition process to voltage signal, capacitive sensing probe is arranged on to be deposited in the container of liquid reagent, for reducing device complicacy, capacitive sensing probe is set to hollow, simultaneously as the path of liquid reagent flowing.
For preventing sucking air in reagent reacting process, the leakage of reagent is caused to add or add less, the capacitive sensing probe end position of level sensing prior-warning device is set to insulation, main body section and distal portion are distinguished from material, when liquid reagent is reduced to insulation position, the capacitance detected can produce saltus step, and testing circuit is caught and changed and provide information warning.
The distal portion of capacitive sensing probe does insulation processing by two kinds of methods, is respectively by splicing insulating material at probe end or plating insulating coating at probe end, the preferred plastics of insulating material or pottery, the preferred Teflon coating of insulating coating.
Embodiment 2
In the Automatic analyzer course of work, constantly reduce along with reagent consumes liquid level, capacitive sensing probe in detecting to electric capacity slowly change, when reagent liquid level be reduced to capacitive sensing probe insulation position time, capacitive sensing probe in detecting to capacitance can produce saltus step.
SCM PWM exports the fixed frequency square-wave signal of 100 ~ 500KHz to capacitive divider, the electric capacity joint effect that reference capacitance in capacitive divider and capacitive sensing probe detect inputs to the square-wave signal in capacitive divider, square-wave signal amplitude after capacitive divider changes, voltage signal is converted into after inputing to rectifier filer again, voltage signal inputs to single-chip microcomputer again, single-chip microcomputer inputs to system control cpu after utilizing inner A/D converter to carry out acquisition process to voltage signal, information warning is provided by CPU, reminding user liquid make-up reagent.The computing formula of square-wave signal amplitude change is:
A
transform amplitude=C
reference capacitance/ (C
reference capacitance+ C
probe) × A
original amplitude
When capacitive sensing probe detect reagent liquid level drop to probe insulation position time, the electric capacity that probe detects increases rapidly, after the conversion that prior-warning device detects, the amplitude of square-wave signal also increases thereupon, when the threshold value being increased to level sensing prior-warning device and presetting, i.e. and A
transform amplitude< A
threshold value, prior-warning device will provide information warning.
Claims (6)
1. a level sensing prior-warning device, it is characterized in that being made up of capacitive sensing probe and testing circuit, described testing circuit comprises capacitive divider, rectifier filer, single-chip microcomputer, system control cpu, reference capacitance joint effect in the electric capacity that described capacitive sensing probe detects and capacitive divider is inputed to the fixed frequency square-wave signal of capacitive divider by SCM PWM, square-wave signal inputs to rectifier filer again and obtains voltage signal after capacitive divider, voltage signal inputs to single-chip microcomputer again, single-chip microcomputer inputs to system control cpu after utilizing inner A/D converter to carry out acquisition process to voltage signal, described capacitive sensing probe is that hollow is arranged on and deposits in the container of liquid reagent, distal portion is close to container bottom.
2. level sensing prior-warning device as claimed in claim 1, is characterized in that described capacitive sensing probe end position is set to insulation.
3. level sensing prior-warning device as claimed in claim 2, is characterized in that described capacitive sensing probe is by distal portion being set to insulation at probe end splicing insulating material or the method that plates insulating coating at probe end.
4. level sensing prior-warning device as claimed in claim 3, is characterized in that described capacitive sensing probe end insulating material is plastics or pottery.
5. level sensing prior-warning device as claimed in claim 3, is characterized in that described capacitive sensing probe end insulating coating is Teflon coating.
6. the level sensing prior-warning device as described in any one of claim 1-5, is characterized in that described fixed frequency square-wave signal is 100 ~ 500KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520399282.7U CN204679150U (en) | 2015-06-11 | 2015-06-11 | A kind of level sensing prior-warning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520399282.7U CN204679150U (en) | 2015-06-11 | 2015-06-11 | A kind of level sensing prior-warning device |
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| CN204679150U true CN204679150U (en) | 2015-09-30 |
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| CN201520399282.7U Active CN204679150U (en) | 2015-06-11 | 2015-06-11 | A kind of level sensing prior-warning device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289448A (en) * | 2015-06-11 | 2017-01-04 | 北京勤邦生物技术有限公司 | A kind of Level Detection prior-warning device |
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2015
- 2015-06-11 CN CN201520399282.7U patent/CN204679150U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289448A (en) * | 2015-06-11 | 2017-01-04 | 北京勤邦生物技术有限公司 | A kind of Level Detection prior-warning device |
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