CN104713614B - A kind of liquid level sensor and detection method - Google Patents
A kind of liquid level sensor and detection method Download PDFInfo
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- CN104713614B CN104713614B CN201510124234.1A CN201510124234A CN104713614B CN 104713614 B CN104713614 B CN 104713614B CN 201510124234 A CN201510124234 A CN 201510124234A CN 104713614 B CN104713614 B CN 104713614B
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Abstract
The invention discloses a kind of liquid level sensor and detection method, described device includes being used for the detecting liquid level mechanism for detecting liquid level, for maintaining the constant fluid path wiper mechanism of the gas in air cavity, for controlling the control system of detecting liquid level mechanism and fluid path wiper mechanism, the detecting liquid level mechanism, the fluid path wiper mechanism are connected with the control system respectively.The present invention passes through the method that the analysis to pressure change in pipette carries out level detection, there is provided one it is simple in construction, stably, accuracy and the high liquid level checking method and device of reliability, improve the sensitivity of level detection, provide users with the convenient.
Description
Technical field
The present invention relates to liquid level field of sensing technologies, more particularly to a kind of liquid level sensor and detection method.
Background technology
Chemical illumination immunity analysis instrument is the self-reacting device for determining some chemical compositions in blood, is by reagent and sample
Originally being filled into reaction cup makes it react to each other, and its reacted reaction solution is automatically analyzed, device have reagent and
Sample is filled into the liquid filling device in reaction cup.
Filling apparatus most at present all passes through capacitance detecting using reusable stainless pin or other conductors
Mode detects to liquid level, realizes the filling to reagent and sample, reuses, deposit after being cleaned after the completion of filling to it
In certain cross pollution.But in the wide immunization program test of test concentrations scope, the cross pollution between reagent and sample is outstanding
To be important.
Therefore, prior art has yet to be improved and developed.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, using disposable pipette, leads to
Cross the method that the analysis to pressure change in pipette carries out level detection, there is provided one it is simple in construction, stably, accuracy and can
By property high liquid level checking method and device, the sensitivity of level detection is improved.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of liquid level sensor, wherein, including：For detecting the detecting liquid level mechanism of liquid level, for maintaining in air cavity
The constant fluid path wiper mechanism of gas, for controlling the control system of detecting liquid level mechanism and fluid path wiper mechanism, the liquid
Face detection agency, the fluid path wiper mechanism are connected with the control system respectively；
The detecting liquid level mechanism includes being used for the pipette for drawing liquid, for installing the probe of the pipette, uses
In the gas circuit pipe of gas circulation, for detecting the pressure sensor of pressure, and the parameter of pressure sensor is handled
Pressure detection circuit, the pipette connect the probe, and the probe is connected by the gas circuit pipe and the pressure sensor
Connect, the pressure sensor is connected with the pressure detection circuit, and the pressure sensor is also connected with control system；
The fluid path wiper mechanism includes being used for the water system for providing water for cleaning, for controlling the cleaning of water system
The magnetic valve whether to be circulated with water, for providing the plunger pump of engine pressure for liquid, for water for cleaning circulation influidic pipe,
And the water for cleaning in influidic pipe is entered to the fluid path pin of probe, the water system connects the control system and institute respectively
Magnetic valve is stated, the plunger pump connects the control system, the magnetic valve and the influidic pipe, the influidic pipe connection respectively
Fluid path pin.
Described liquid level sensor, wherein, the magnetic valve is 2/2-way magnetic valve.
Described liquid level sensor, wherein, pass through connecing with pipe collar between described fluid path pin one end and the influidic pipe
Head is attached, and the other end is located in the probe.
Described liquid level sensor, wherein, pass through connecing with pipe collar between described gas circuit pin one end and the gas circuit pipe
Head is attached, and the other end is located in the probe.
Described liquid level sensor, wherein, connected between the gas circuit pipe and the pressure sensor by flexible pipe
Connect.
Described liquid level sensor, wherein, the length of the fluid path pin is longer than the length of the gas circuit pin, the gas circuit
Pin is in the housing of the probe, the outside of housing of the fluid path pin in probe.
Described liquid level sensor, wherein, the pressure detection circuit also includes being used for obtain pressure sensor
The signal amplifier that voltage signal is amplified.
Described liquid level sensor, wherein, the control system also includes memory, for storing pressure detection circuit
Voltage signal values corresponding to the pressure detected.
Based on the detection method of liquid level sensor described above, wherein, comprise the following steps：
S1, the pressure change for gathering pipette interior；
S2, pipette slowly decline, while gather pressure value every a scheduled time, are exported according to the change of pressure relative
The voltage signal values answered；
S3, the voltage signal values of the voltage signal values and the first sample point that gather the sampled point come are compared in real time
Compared with, and the changing value of voltage signal is calculated, then compared with first threshold, if be more than first threshold, output detection
To liquid level signal, step S4 is performed if first threshold is less than；
S4, judge air pressure change value before the 3rd sampled point and the second sampled point, then compared with first threshold, if
During more than threshold value first threshold, then output detects liquid level signal, then step S5 is then performed less than first threshold；
S5, judge whether sampling time and the ratio of the pressure differential before the first sampled point to current sampling point are less than second
Threshold value, if error is within the specific limits, output detects liquid level signal.
Described liquid level checking method, wherein, when liquid level sensor suspends in atmosphere, liquid level detection circuit detection
Magnitude of voltage corresponding to the pressure gone out, P1 is designated as, caused pressure is designated as P2 after setting pipette enters liquid, and first threshold is set
For L1, first threshold L1=P2-P1；
If △ v1 be pipette from air enter liquid level when neighbouring 2 points between pressure differential, pressure differential is designated as △
P, △ P=P2-P1, △ t are sampling time interval, and Second Threshold is set to L2, L2=△ v1/ △ t.
The invention provides a kind of liquid level sensor and detection method, described device includes being used for the liquid level for detecting liquid level
Detection agency, for maintaining the constant fluid path wiper mechanism of the gas in air cavity, for controlling detecting liquid level mechanism and fluid path clear
The control system of washing machine structure, the detecting liquid level mechanism, the fluid path wiper mechanism are connected with the control system respectively.This
Invention passes through the method that the analysis to pressure change in pipette carries out level detection, there is provided one simple in construction, stably, accurately
Property and the high liquid level checking method and device of reliability, improve the sensitivity of level detection.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the preferred embodiment of liquid level sensor of the present invention.
Fig. 2 is a kind of a kind of level detection analogue signal amplitude-displacement of embodiment of liquid level checking method of the present invention
Waveform diagram.
Fig. 3 is a kind of flow chart of the Application Example of liquid level checking method of the present invention.
1st, water system 2,2/2-way magnetic valve 3, plunger pump 4, reaction cup 5, pipette 6, probe 7, pressure sensor
8th, flexible pipe 9, gas circuit pipe 10, joint 11, pipe collar 12, influidic pipe 13, fluid path pin 14, gas circuit pin 15, pressure detection circuit 16, control
System.
Embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
The invention provides a kind of liquid level sensor, wherein, including：For detecting the detecting liquid level mechanism of liquid level, use
In maintaining the constant fluid path wiper mechanism of the gas in air cavity, for controlling the control of detecting liquid level mechanism and fluid path wiper mechanism
System, the detecting liquid level mechanism, the fluid path wiper mechanism are connected with the control system respectively.
Specifically, as shown in figure 1, the detecting liquid level mechanism includes being used for the pipette 5 for drawing liquid, for installing
The probe 6 of pipette is stated, for the gas circuit pipe 9 of gas circulation, is passed for detecting the pressure sensor 7 of pressure, and by pressure
The pressure detection circuit 15 that the parameter of sensor 7 is handled, the pipette 5 connect the probe 6, and the probe 6 passes through institute
State gas circuit pipe 9 to be connected with the pressure sensor 7, the pressure sensor 7 is connected with the pressure detection circuit 15, the pressure
Force snesor 7 is also connected with control system 16.
The fluid path wiper mechanism includes being used for the water system 1 for providing water for cleaning, for controlling the clear of water system
The magnetic valve 2 whether scouring water circulates, for providing the plunger pump 3 of engine pressure for liquid, the liquid for water for cleaning circulation
Road pipe 12, and the fluid path pin 13 by the water for cleaning in influidic pipe into probe, the water system 1 connect the control respectively
System 16 processed and the magnetic valve 2, the plunger pump 3 connect the control system 16, the magnetic valve 2 and the fluid path respectively
Pipe 12, the influidic pipe 12 are also connected with fluid path pin 13.
When it is implemented, the magnetic valve 2 is 2/2-way magnetic valve.
When it is implemented, the present invention avoids cross pollution to be easy to unload after having filled sample liquid.The pipette
Using disposable pipette.The one end of probe 6 fixes fluid path pin 13 and gas circuit pin 14 and closed, and the other end is gentle by fluid path pin 13
It is outer and form an air cavity with disposable pipette 5 that road pin 14 exposes mouth, when 2/2-way magnetic valve 2 is closed, plunger pump 3 and liquid
In road pin 13 it is hydraulically full after, pressure sensor 7 and disposable pipette 5 form the air cavity of a path.Disposable pipette 5
When entering from air in liquid level, pressure caused by liquid level is set to pass to pressure sensor 7 by air cavity.Disposable pipette 5 is pacified
It is attached on probe 6, is easy to unload after having filled sample, avoids cross pollution.Control system 16, water system 1,2/2-way electricity
Magnet valve 2, plunger pump 3, influidic pipe 12 and fluid path pin 13 constitute fluid path wiper mechanism.Wherein by the residual gas in fluid path pin 13
Discharge, ensures that the gas of air cavity during each detecting liquid level is constant, is advantageous to the stability of detecting liquid level.
Specifically, connected between described one end of fluid path pin 13 and the influidic pipe 12 by the joint 10 with pipe collar 11
Connect, the other end is located in the probe 6.
Specifically, it is attached between described one end of gas circuit pin 14 and the gas circuit pipe 9 by the joint 10 with pipe collar 11,
The other end is located in the probe 6.
When it is implemented, it is attached between the gas circuit pipe 9 and the pressure sensor 7 by flexible pipe 8.
The length of the fluid path pin 13 is longer than the length of the gas circuit pin 14, shell of the gas circuit pin 14 in the probe 6
In vivo, the outside of housing of the fluid path pin 13 in probe 6.
The pressure detection circuit 15 also includes being used for the signal for being amplified the voltage signal that pressure sensor 7 obtains
Amplifier.
Specifically, the control system 16 also includes memory, the pressure pair detected for storing pressure detection circuit
The voltage signal values answered.
Present invention also offers a kind of detection method based on liquid level sensor described above, wherein, including following step
Suddenly：
S1, the pressure change for gathering pipette interior；
S2, pipette slowly decline, while gather pressure value every a scheduled time, are exported according to the change of pressure relative
The voltage signal values answered；
S3, the voltage signal values of the voltage signal values and the first sample point that gather the sampled point come are compared in real time
Compared with, and the changing value of voltage signal is calculated, then compared with first threshold, if be more than first threshold, output detection
To liquid level signal, step S4 is performed if first threshold is less than；
S4, judge air pressure change value before the 3rd sampled point and the second sampled point, then compared with first threshold, if
During more than threshold value first threshold, then output detects liquid level signal, then step S5 is then performed less than first threshold；
S5, judge whether sampling time and the ratio of the pressure differential before the first sampled point to current sampling point are less than second
Threshold value, if error is within the specific limits, output detects liquid level signal.
Described liquid level checking method, wherein, when liquid level sensor suspends in atmosphere, liquid level detection circuit detection
Magnitude of voltage corresponding to the pressure gone out, P1 is designated as, caused pressure is designated as P2 after setting pipette enters liquid, and first threshold is set
For L1, first threshold L1=P2-P1；
If △ v1 be pipette from air enter liquid level when neighbouring 2 points between pressure differential, pressure differential is designated as △
P, △ P=P2-P1, △ t are sampling time interval, and Second Threshold is set to L2, L2=△ v1/ △ t.
Sampling interval duration in the present invention is adjustable, and preferential uses 100ms.
Specifically often the sampled point in invention can be sampled by the sampling time, can also be sampled according to sampled distance.
The present invention also provides a kind of level detection analogue signal amplitude-position of the concrete application embodiment of liquid level checking method
Move oscillogram, as shown in Fig. 2 including start zero point be s0, the first sampling point position s1, the second sampling point position s2, be spaced adopt
Air pressure V2, unit interval displacement △ t, the draught head of unit interval at air pressure V1, sampled point s2 at sample distance △ s1, sampled point s1
△v1；The atmospheric pressure value that collection comes in real time and calculates air pressure change value compared with air pressure V1 at sampled point s1, then with threshold value
1 is compared, and during more than threshold value 1, expression detects liquid level.△ s1 equal to V2 to V1 distance be equal to V2 ˊ to V1 ˊ away from
From parallel the distance between 2 points at equal intervals slided backward are equal to, wherein take the pressure value of △ s1 point-to-point transmissions to be compared,
If the difference of 2 points of pressure value is more than threshold value 1, then it represents that detects liquid level.△ v1 are since s1 points and moved in parallel backward
Adjacent 2 points between pressure differential, △ t be adjacent 2 points between time difference, when entering liquid from gas, due to air pressure
There is a mutation, by calculating the rate of change △ v1/ △ t of air pressure, so as to judge whether to detect liquid level, when rate of change is more than threshold
During value 2, expression detects liquid level.
First pressure value in the computing unit is judged since the S1 of position, and second pressure value is since the S2 of position
Judge, and compared with first pressure value slides backward sampling with second pressure value so that △ s1 are parallel, if two comparing voltage values are big
Liquid level signal is detected in the output of threshold value 1；Specifically, the Pressure Analysis position is since S1, because s0 to s1 is that mechanism is firm
Setting in motion area, belongs to unstable region.
Wherein, when detecting liquid level mechanism suspends in atmosphere, pressure sensor pressure is standard atmospheric pressure, is designated as
P1, caused pressure is designated as P2,1=P2-P1 of threshold value after set mechanism enters liquid.
If △ v1 be pipette from air enter liquid level when neighbouring 2 points between pressure differential, △ t be adjacent two
Time difference between point, threshold value 2=△ v1/ △ t.
Specific implementation, the sampling interval are preferably 100ms, and sampled distance may be set to 0.1mm, and pipette is at the uniform velocity
Move downward.And specific sampling time interval can also determine that the distance of sampling can also move according to pipette according to actual conditions
Dynamic distance determines.
Specifically, the threshold value 1 is adjustable, and threshold value 2 is adjustable, and threshold value can be two or more, and this detection method only makes
With two threshold values.
Present invention also offers a kind of flow chart of the Application Example of liquid level checking method, as shown in figure 3, methods described
Including：
Step S10, start, perform step S20 afterwards;
Step S20, disposable pipette takes a pressure value Vi deposit array, specifically, control system control every △ t
Disposable pipette carries out pressure acquisition while moving down, and △ s are sampled 1 time, and the pressure value Vi of collection is stored in into number
Group.Step S30 is performed afterwards；
Step S30, disposable pipette, which is moved at s1, records pressure value V1 herein, is moved at s2 and records pressure herein
Value V2, step S40 is performed afterwards；
Step S40, judge whether Vi-V1 is more than threshold value 1, if it is, performing step S70；If it is not, then perform step
Rapid S20；
Step S50, judge whether V2- V1 are more than threshold value 1, if it is perform step S70, if it is not, then performing step
S20；
Step S60, judge whether △ v1/ △ t are more than threshold value 2, specifically, △ v1/ △ t are the rate of change of air pressure, work as suction
Liquid pipe from air enter liquid when air pressure have a mutation, when the rate of change △ v1/ △ t of air pressure are more than threshold value 2, then it represents that
Detect liquid level.If it is, step S70 is performed if it is not, then performing step S20；
Step S70, output detects liquid level signal, performs step S70 afterwards；
Step S80, terminate.
In summary, the invention provides a kind of liquid level sensor and detection method, described device includes being used to detect
The detecting liquid level mechanism of liquid level, for maintaining the constant fluid path wiper mechanism of the gas in air cavity, for controlling detecting liquid level machine
The control system of structure and fluid path wiper mechanism, the detecting liquid level mechanism, the fluid path wiper mechanism are respectively with the control
System is connected.The method that the present invention carries out level detection by the analysis to pressure change in pipette, there is provided a structure letter
It is single, stably, accuracy and the high liquid level checking method and device of reliability, improve the sensitivity of level detection.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect scope.
Claims (10)
- A kind of 1. liquid level sensor, it is characterised in that including：For detecting the detecting liquid level mechanism of liquid level, for maintaining gas The constant fluid path wiper mechanism of gas in chamber, for controlling the control system of detecting liquid level mechanism and fluid path wiper mechanism, institute State detecting liquid level mechanism, the fluid path wiper mechanism is connected with the control system respectively；The detecting liquid level mechanism includes being used for the pipette for drawing liquid, for installing the probe of the pipette, for gas The gas circuit pipe of body circulation, for detecting the pressure sensor of pressure, and the pressure that the parameter of pressure sensor is handled Circuit is detected, the pipette connects the probe, and the probe is connected by the gas circuit pipe with the pressure sensor, institute State pressure sensor to be connected with the pressure detection circuit, the pressure sensor is also connected with control system；The fluid path wiper mechanism includes being used for the water system for providing water for cleaning, for controlling the water for cleaning of water system The magnetic valve whether to circulate, for providing the plunger pump of engine pressure for liquid, for the influidic pipe of water for cleaning circulation, and Water for cleaning in influidic pipe is entered to the fluid path pin of probe, the water system connects the control system and the electricity respectively Magnet valve, the plunger pump connect the control system, the magnetic valve and the influidic pipe respectively, and the influidic pipe connects fluid path Pin；The pipette uses disposable pipette；Described probe one end fixes fluid path pin and gas circuit pin and closed, the other end Fluid path pin and gas circuit pin are exposed outside mouth and form an air cavity with disposable pipette, works as closed electromagnetic valve, plunger pump and liquid In the pin of road it is hydraulically full after, pressure sensor and disposable pipette form the air cavity of a path；Disposable pipette is from sky When gas is entered in liquid level, pressure caused by liquid level is set to pass to pressure sensor by air cavity；Disposable pipette is installed to spy On pin, it is easy to unload after having filled sample, avoids cross pollution；Pipette slowly declines, while each gathers pressure value with the scheduled time, and pressure sensor exports according to the change of pressure Corresponding voltage signal values, when pipette enters liquid from gas, because air pressure has a mutation, pressure sensor receives To pressure have a mutation, expression detects liquid level, will detect that liquid level signal exports；When calculating liquid level sensor suspension in atmosphere, magnitude of voltage and imbibition corresponding to the pressure that liquid level detection circuit detects Pipe enters the difference of caused pressure value after liquid；Calculate pipette from air enter liquid level when it is neighbouring between 2 points Pressure differential and sampling time interval quotient；When liquid level sensor is suspended in atmosphere, magnitude of voltage corresponding to the pressure that liquid level detection circuit detects, P1 is designated as, if Determine caused pressure after pipette enters liquid and be designated as P2, first threshold is set to L1, first threshold L1=P2-P1；If △ v1 For pipette from air enter liquid level when neighbouring 2 points between pressure differential, pressure differential is designated as △ P, △ P=P2-P1, △ t are sampling time interval, and Second Threshold is set to L2, L2=△ v1/ △ t；The pressure change of pipette interior is taken, pipette slowly declines, while gathers pressure value every a scheduled time, according to The change of pressure exports corresponding voltage signal values, will gather the voltage signal values and the first sampled point of the sampled point come in real time The voltage signal values at place are compared, and calculate the changing value of voltage signal, then compared with the first threshold, are more than During the first threshold, output detects liquid level signal, then judges the 3rd sampled point and the second sampling less than the first threshold The air pressure change value of point, then compared with first threshold, if being more than first threshold, output detection liquid level signal, if being less than First threshold then judges whether sampling time and the ratio of the first sampled point to the pressure differential of current sampling point are less than described second Threshold value, if error is within the specific limits, output detects liquid level signal.
- 2. liquid level sensor according to claim 1, it is characterised in that the magnetic valve is 2/2-way magnetic valve.
- 3. liquid level sensor according to claim 1, it is characterised in that described fluid path pin one end and the influidic pipe it Between be attached by the joint with pipe collar, the other end is located in the probe.
- 4. liquid level sensor according to claim 1, it is characterised in that described gas circuit pin one end and the gas circuit pipe it Between be attached by the joint with pipe collar, the other end is located in the probe.
- 5. liquid level sensor according to claim 1, it is characterised in that the gas circuit pipe and the pressure sensor it Between be attached by flexible pipe.
- 6. liquid level sensor according to claim 1, it is characterised in that the length of the fluid path pin is longer than the gas circuit The length of pin, the gas circuit pin is in the housing of the probe, the outside of housing of the fluid path pin in probe.
- 7. liquid level sensor according to claim 1, it is characterised in that the pressure detection circuit also includes being used to incite somebody to action The signal amplifier that the voltage signal that pressure sensor obtains is amplified.
- 8. liquid level sensor according to claim 1, it is characterised in that the control system also includes memory, uses In voltage signal values corresponding to the pressure that storage pressure detection circuit detects.
- 9. a kind of detection method based on any one of the claim 1-8 liquid level sensors, it is characterised in that including following Step：S1, the pressure change for gathering pipette interior；S2, pipette slowly decline, while gather pressure value every a scheduled time, corresponding according to the change output of pressure Voltage signal values；S3, in real time by gather come sampled point voltage signal values compared with the voltage signal values of the first sample point, and The changing value of voltage signal is calculated, then compared with first threshold, if be more than first threshold, output detects liquid level Signal, step S4 is performed if first threshold is less than；S4, the air pressure change value for judging the 3rd sampled point and the second sampled point, then compared with first threshold, if more than first During threshold value, then output detects liquid level signal, and step S5 is performed if first threshold is less than；S5, judge whether the sampling time is less than Second Threshold with the first sampled point to the ratio of the pressure differential of current sampling point, if Within the specific limits, then output detects liquid level signal to error.
- 10. detection method according to claim 9, it is characterised in that when liquid level sensor suspends in atmosphere, liquid Magnitude of voltage corresponding to the pressure that face detection electric circuit inspection goes out, is designated as P1, and setting pipette enters caused pressure note after liquid For P2, first threshold is set to L1, first threshold L1=P2-P1；If △ v1 be pipette from air enter liquid level when neighbouring 2 points between pressure differential, pressure differential is designated as △ P, △ P=P2-P1, △ t are sampling time interval, and Second Threshold is set to L2, L2=△ v1/ △ t.
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| CN201510124234.1A CN104713614B (en) | 2015-03-20 | 2015-03-20 | A kind of liquid level sensor and detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105067080B (en) * | 2015-08-06 | 2018-01-02 | 迈克医疗电子有限公司 | Capacitive liquid-level detecting device, method and system |
| CN105004401B (en) * | 2015-08-07 | 2018-07-31 | 迈克医疗电子有限公司 | Liquid detection device and method |
| CN106391606B (en) * | 2016-10-17 | 2019-07-23 | 深圳开立生物医疗科技股份有限公司 | A kind of detecting instrument and its reaction vessel cleaning method |
| CN109718883B (en) * | 2018-12-25 | 2021-11-12 | 迪瑞医疗科技股份有限公司 | Liquid transfer device and liquid transfer method |
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| US4780833A (en) * | 1985-09-17 | 1988-10-25 | Minoru Atake | System for measuring liquid |
| CN1318740A (en) * | 2000-04-19 | 2001-10-24 | 爱科来株式会社 | Level detecting method and device |
| CN1888827A (en) * | 2006-07-12 | 2007-01-03 | 苏州捷美电子有限公司 | Pressure liquid level detector for enzyme immunity instrument |
| CN103185622A (en) * | 2013-01-18 | 2013-07-03 | 厦门优迈科医学仪器有限公司 | Liquid loading device and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS63109330A (en) * | 1986-10-27 | 1988-05-14 | Kyoto Daiichi Kagaku:Kk | Method and apparatus for detecting liquid level |
| JPH02243960A (en) * | 1989-03-17 | 1990-09-28 | Jeol Ltd | System for operating dispenser of analysis apparatus |
| JPH087222B2 (en) * | 1990-01-18 | 1996-01-29 | 持田製薬株式会社 | Automatic dispensing dilution device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4780833A (en) * | 1985-09-17 | 1988-10-25 | Minoru Atake | System for measuring liquid |
| CN1318740A (en) * | 2000-04-19 | 2001-10-24 | 爱科来株式会社 | Level detecting method and device |
| CN1888827A (en) * | 2006-07-12 | 2007-01-03 | 苏州捷美电子有限公司 | Pressure liquid level detector for enzyme immunity instrument |
| CN103185622A (en) * | 2013-01-18 | 2013-07-03 | 厦门优迈科医学仪器有限公司 | Liquid loading device and control method thereof |
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Address after: 130103 No. 3333 livable Road, hi tech Development Zone, Jilin, Changchun Applicant after: Medical Polytron Technologies Inc Address before: 130103 No. 3333 livable Road, hi tech Development Zone, Jilin, Changchun Applicant before: Changchun Dirui Medical Technology Co., Ltd. |
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