CN208334395U - Detecting liquid level tracking device for Flow Analyzer - Google Patents
Detecting liquid level tracking device for Flow Analyzer Download PDFInfo
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- CN208334395U CN208334395U CN201820970436.7U CN201820970436U CN208334395U CN 208334395 U CN208334395 U CN 208334395U CN 201820970436 U CN201820970436 U CN 201820970436U CN 208334395 U CN208334395 U CN 208334395U
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- sample
- sample introduction
- operational amplifier
- adjustable resistance
- liquid level
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Abstract
The detecting liquid level tracking device for Flow Analyzer of the utility model includes sample tube, sample introduction needle, converter, operational amplifier, detector and controller, the positive input terminal of operational amplifier is connect with converter by first line, the negative input end of operational amplifier and one end of resistance pass through the second connection, the other end of resistance is grounded, sample tube after sample introduction needle and ground connection forms the capacitor of ground connection, the connection of the output end of detector and operational amplifier, variation of the detector for the pulse of detection calculations amplifier output, controller is connect with detector by tertiary circuit.The technical solution of the utility model determines liquid level according to the principle of capacitance method, the speed of sample introduction needle decline is controlled according to the decrease speed of liquid level, sample introduction syringe needle is in always at the following fixed position relative of liquid level, effectively reduce the cross contamination between sample, consumption and the scavenging period for reducing cleaning solution, mitigate the workload of sample introduction needle cleaning.
Description
Technical field
The utility model relates to analytical chemistry fields, track more particularly to a kind of detecting liquid level for Flow Analyzer
Device.
Background technique
When the work of flow analysis instrument, sampling step is very crucial, if sample introduction is accurate, is conducive to analyze result standard
Really.The sample introduction of Flow Analyzer is generally used autosampler sample introduction at present, autosampler include sample disc, sample introduction arm,
The devices such as motor are connected with sample introduction needle on sample introduction arm.Sampling needle is generally metal material, and sample introduction needle is usually goed deep into sample by when use
The bottom pipette samples of product test tube, the sample solution for being attached to sample introduction needle outer wall in this way is excessive, not only leads to sample loss, and
It is be easy to cause cross contamination, is one of an important factor for causing sample test error.If can subtract to detecting liquid level and tracking
The contact length or contact area of few sample introduction needle and sample or solution, it is possible to reduce cross contamination, it is ensured that test data is accurate；Together
When can be reduced cleaning sample introduction needle generate waste liquid, save the time, improve the intelligent level of instrument.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of structure is simple, it is possible to reduce the intersection between sample
Pollute and mitigate the detecting liquid level tracking device for Flow Analyzer of the workload of sample introduction needle cleaning.
The detecting liquid level tracking device for Flow Analyzer of the utility model, including the sample for containing sample solution
Product test tube, the sample introduction needle for extracting sample solution, converter, operational amplifier, detector and the control being connect with sample introduction needle
The positive input terminal of device processed, operational amplifier is connect with converter by first line, the negative input end and resistance of operational amplifier
One end by the second connection, the other end of resistance is grounded, and the sample tube after sample introduction needle and ground connection forms the electricity of ground connection
Hold, so that sample introduction needle contacts front and back with the sample solution in sample tube, operational amplifier exports different pulses, the detection
The connection of the output end of device and operational amplifier, variation of the detector for the pulse of detection calculations amplifier output are described
Controller is connect with detector by tertiary circuit.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein it further include the first adjustable resistance,
One end of first adjustable resistance is connected in first line, and the other end of first adjustable resistance is connected to tertiary circuit
On, so that the first adjustable resistance is in parallel with operational amplifier, detector.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein it further include the second adjustable resistance,
One end of second adjustable resistance is connected on the second route, and the other end of second adjustable resistance is connected to tertiary circuit
On, so that the second adjustable resistance is in parallel with operational amplifier, detector.
The detecting liquid level tracking device for Flow Analyzer of the utility model, including the sample for containing sample solution
Product test tube, the sample introduction needle for extracting sample solution, converter, operational amplifier, detector and the control being connect with sample introduction needle
The positive input terminal of device processed, operational amplifier is connect with converter by first line, the negative input end and resistance of operational amplifier
One end by the second connection, the other end of resistance is grounded, and sample introduction needle includes inner layer sleeve and outer layer sleeve, the internal layer
Teflon film, outer layer sleeve ground connection are coated between casing and outer layer sleeve, inner layer sleeve and outer layer sleeve form the electricity being grounded
Hold, so that sample introduction needle contacts front and back with the sample solution in sample tube, operational amplifier exports different pulses, the detection
The connection of the output end of device and operational amplifier, variation of the detector for the pulse of detection calculations amplifier output are described
Controller is connect with detector by tertiary circuit.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein it further include the first adjustable resistance,
One end of first adjustable resistance is connected in first line, and the other end of first adjustable resistance is connected to tertiary circuit
On, so that the first adjustable resistance is in parallel with operational amplifier, detector, first adjustable resistance is for reducing operational amplifier
Amplification factor.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein it further include the second adjustable resistance,
One end of second adjustable resistance is connected on the second route, and the other end of second adjustable resistance is connected to tertiary circuit
On, so that the second adjustable resistance is in parallel with operational amplifier, detector, second adjustable resistance is for increasing operational amplifier
Amplification factor.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein further include sample introduction arm, it is described into
Sample arm is installed on the top of sample tube in which can move up and down and rotate left and right, and the sample introduction needle is installed on the sample introduction arm
On, for driving the sample introduction needle up and down and moving left and right, the sample tube is placed in sample disc the sample introduction arm, described
Sample tube is glass sample test tube or plastic sample test tube, and sample disc is metal sample disk or plastic sample disk.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein the controller and the inspection
The motor for surveying device and sample introduction arm is separately connected, the controller be used to be controlled according to the pulse change that operational amplifier exports into
Sample arm is moved towards sample tube or far from sample tube.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein the front end of the sample introduction needle connects
It is connected to sample introduction syringe needle, the sample introduction needle is stainless steel material sample introduction needle, and sample introduction syringe needle is 5-25 millimeters long, the sample introduction syringe needle and institute
It states and is seamlessly connected together between sample introduction needle.
The technical solution of the utility model provides a kind of for Flow Analyzer (including bubble interval Continuous Flow Analysis instrument
And flow injection analyzer) liquid detection device, liquid level is determined according to the principle of capacitance method, according to the lower reduction of speed of liquid level
It spends to control the speed of sample introduction needle decline, sample introduction syringe needle is in always at the following fixed position relative of liquid level, effectively reduces sample
Between cross contamination, reduce consumption and the scavenging period of cleaning solution, mitigate the workload of sample introduction needle cleaning.
Detailed description of the invention
Fig. 1 is that the structure of the first embodiment of the detecting liquid level tracking device for Flow Analyzer of the utility model is shown
It is intended to；
Fig. 2 is that the structure of the second embodiment of the detecting liquid level tracking device for Flow Analyzer of the utility model is shown
It is intended to；
Fig. 3 is the structural schematic diagram of sample introduction arm.
Specific embodiment
Embodiment one
As shown in Figure 1, the detecting liquid level tracking device for Flow Analyzer of the utility model, including for containing sample
The sample tube 1 of product solution, the sample introduction needle 2 for extracting sample solution, converter 3, the operational amplifier being connect with sample introduction needle
4, the positive input terminal of detector 5 and controller 6, operational amplifier 4 is connect with converter 3 by first line, operation amplifier
The negative input end of device 4 and one end of resistance 9 are by the second connection, and the other end of resistance 9 is grounded, after sample introduction needle 2 and ground connection
Sample tube 1 form the capacitor of ground connection so that before and after sample introduction needle contacts with the sample solution in sample tube, operational amplifier
The different pulse of 4 outputs, detector 5 are connect with the output end of operational amplifier 4, and detector 5 is defeated for detection calculations amplifier 4
The variation of pulse out, controller 6 are connect with detector 5 by tertiary circuit.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein further include the first adjustable resistance
7, one end of the first adjustable resistance 7 is connected in first line, and the other end of the first adjustable resistance 7 is connected on tertiary circuit,
So that the first adjustable resistance is in parallel with operational amplifier, detector.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein further include the second adjustable resistance
8, one end of the second adjustable resistance 8 is connected on the second route, and the other end of the second adjustable resistance is connected on tertiary circuit, with
Keep the second adjustable resistance in parallel with operational amplifier, detector.
Embodiment two
As shown in Figure 2 and Figure 3, the detecting liquid level tracking device for Flow Analyzer of the utility model, including for containing
The sample tube 1 of dress sample solution, the sample introduction needle 2 for extracting sample solution, the converter 3 connecting with sample introduction needle, operation are put
Big device 4, detector 5 and controller, the positive input terminal of operational amplifier are connect with converter by first line, operation amplifier
The negative input end of device and one end of resistance 9 are by the second connection, and the other end of resistance 9 is grounded, and sample introduction needle 2 includes internal layer set
Pipe and outer layer sleeve, coat Teflon film between inner layer sleeve and outer layer sleeve, inner layer sleeve connects converter 3, outer layer jacket
Pipe ground connection, inner layer sleeve and outer layer sleeve form the capacitor of ground connection, so that sample introduction needle is contacted with the sample solution in sample tube
Front and back, operational amplifier export different pulses, and the output end connection of detector and operational amplifier, detector is for detecting fortune
The variation of the pulse of amplifier output is calculated, controller is connect with detector by tertiary circuit.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein further include the first adjustable resistance
7, one end of the first adjustable resistance is connected in first line, and the other end of the first adjustable resistance is connected on tertiary circuit, with
Keep the first adjustable resistance in parallel with operational amplifier, detector, the first adjustable resistance is used to reduce the times magnification of operational amplifier
Number.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein further include the second adjustable resistance
8, one end of the second adjustable resistance 8 is connected on the second route, and the other end of the second adjustable resistance 8 is connected on tertiary circuit,
So that the second adjustable resistance is in parallel with operational amplifier, detector, the second adjustable resistance is used to increase the amplification of operational amplifier
Multiple.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein further include sample introduction arm 21, sample introduction
Arm 21 is installed on the top of sample tube 1 in which can move up and down and rotate left and right, and sample introduction needle 2 is installed on sample introduction arm 21, sample introduction
For driving about 2 sample introduction needle and moving left and right, sample tube 1 is placed in sample disc arm 21, and sample tube 1 is glass sample
Test tube or plastic sample test tube, sample disc are metal sample disk or plastic sample disk.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein controller 6 and detector 5 with
And the motor 22 of sample introduction arm is separately connected, the variation for the pulse that controller 6 is used to be exported according to operational amplifier 4 controls sample introduction arm
It is moved towards sample tube or far from sample tube.
The detecting liquid level tracking device for Flow Analyzer of the utility model, wherein the front end of sample introduction needle 2 is connected with
Sample introduction syringe needle, sample introduction needle are stainless steel material sample introduction needle, and sample introduction syringe needle is 5-25 millimeters long, nothing between sample introduction syringe needle and sample introduction needle 2
Seam links together.
If capacitance is excessive, the resistance value of the first adjustable resistance is adjusted, reduces the amplification factor of operational amplifier.It is described
The second adjustable resistance of parallel connection is gone back between operational amplifier negative input end and detector adjusts second if capacitance is too small
The resistance value of adjustable resistance increases the amplification factor of operational amplifier.The technical solution of the utility model provides a kind of liquid level spy
Device is surveyed, the amplification factor of operational amplifier can be adjusted according to the property and local environment of sample solution, it not only can be according to liquid level
Decrease speed come control sample introduction needle decline speed, be in sample introduction syringe needle always at the following fixed position relative of liquid level, and
And it is suitable for the sample of differing dielectric constant, avoid the generation of wrong report.
The technical solution of the utility model provides a kind of for Flow Analyzer (including bubble interval Continuous Flow Analysis instrument
And flow injection analyzer) liquid detection device, liquid level is determined according to the principle of capacitance method, according to the lower reduction of speed of liquid level
It spends to control the speed of sample introduction needle decline, sample introduction syringe needle is in always at the following fixed position relative of liquid level, effectively reduces sample
Cross contamination between product reduces consumption and the scavenging period of cleaning solution, mitigates the workload of sample introduction needle cleaning.
The detecting liquid level tracking device for Flow Analyzer of the utility model determines liquid according to the principle of capacitance method
Face, the speed of sample introduction needle decline is controlled according to the decrease speed of liquid level, and sample introduction needle is in the relatively fixed position of liquid level or less always
Place is set, the cross contamination between sample is effectively reduced, mitigates the workload of sample introduction needle cleaning, the device is for environmental change
Smaller, high sensitivity is influenced, is not susceptible to report by mistake.
The liquid detection device for Flow Analyzer of the utility model, wherein sample needle has two kinds of single layer and bilayer,
When using single layer samples needle, sample disc or sample tube ground connection, sample needle and sample disc or sample tube form a capacitor.
When using bilayer sample needle, sample needle is divided to inside and outside two casings, and the outer wall of inner layer sleeve and the inner wall of outer layer sleeve coat Teflon
Dragon, such bilayer sleeve are equivalent to a capacitor, and sample is sucked by the inside of inner layer sleeve.When sample and sample needle contact
When, since dielectric constant changes, the capacitance of capacitor can change, by converter by the signal of the variation of capacitance
Be converted to voltage or current signal.
The liquid detection device for Flow Analyzer of the utility model is in sampling, when sample introduction needle 2 is hanged in air
When empty, the capacitor of ground connection is formed by the sample tube 1 after sample introduction needle 2 and ground connection, the variation of the capacitance of the capacitor passes through conversion
Device 3 is converted to voltage or current signal, enters detector through operational amplifier 4, detector judges whether the numerical value is more than system
The minimum threshold value of setting, under normal circumstances, the variable signal of the capacitance when sample introduction needle 2 is not in contact with liquid level pass through converter 3
Voltage or current signal are converted to, the signal after operational amplifier 4 is far smaller than the minimum threshold value set, which is transmitted to
After controller, controller control sample introduction needle continues to decline towards sample tube.
After sample introduction needle 2 enters sample tube 1 and contacts with the liquid level of sample solution, due to the dielectric constant of sample solution
Occur compared with the dielectric constant of air variation (this variation size and solution property it is related), by sample introduction needle 2 with connect
Corresponding change also has occurred in the capacitance that sample tube 1 behind ground forms ground connection, and the variation of the capacitance passes through 3 turns of converter
It is changed to voltage or current signal, enters detector through operational amplifier 4, detector judges whether the numerical value is more than default
Minimum threshold and max-thresholds, if the dielectric constant of sample solution and the dielectric constants of air are larger, signal is most
Between big threshold value and minimum threshold, then the signal is directly entered controller, and the direction of motion of sample introduction arm is determined by controller；If
The dielectric constant of sample solution and the dielectric constants of air are smaller, and signal then passes through between minimum threshold and minimum threshold value
After detector 5 judges, the resistance value of the second adjustable resistance 8 is adjusted, detector is entered after input signal is further amplified, if put
For signal after big between max-thresholds and minimum threshold, then the signal is directly entered controller, determines sample introduction arm by controller
The direction of motion；If the dielectric constant of sample solution and the dielectric constants of air are very big, signal is in max-thresholds and pole
Between big threshold value, then after the judgement of detector 5, the resistance value of the first adjustable resistance 7 is adjusted, is entered after input signal is reduced in right amount
Detector, if the signal after reducing is between max-thresholds and minimum threshold, which is directly entered controller, by controlling
The direction of motion of device decision sample introduction arm.
The liquid detection device for Flow Analyzer of the utility model by detector judge sample introduction needle 2 whether with sample
Product solution contact, so that liquid level of solution is accurately detected, by periodically detecting, judging during sample introduction, to realize
Detecting liquid level and tracking sample introduction.
Controller 6 and the motor 22 of detector 5 and sample introduction arm 21 are separately connected, and at work, controller 6 is according to operation
The variation for the pulse that amplifier 4 exports controls sample introduction arm and moves towards sample tube 1 or far from sample tube 1, such controller 6
Can cooperate with detector 5, control 2 needle of sample introduction needle with the decline of sample solution liquid level and and then declines, remain into
The syringe needle of sample needle 2 at the following fixed position relative of sample solution liquid level, bottom without entering sample tube 1, into
Sample needle 2 and sample solution contact area remain very little, when being lifted off sample solution into sample introduction needle 2 after complete sample every time, into
Sample syringe needle and sample introduction needle outer wall will not adhere to drop.
The technical solution of the utility model determines liquid level according to the principle of capacitance method, according to the decline of sample solution liquid level
Control the speed of sample introduction needle decline, sample introduction syringe needle is at the following fixed position relative of liquid level always, can effectively subtract in this way
Cross contamination between few sample, reduces consumption and the scavenging period of cleaning solution, mitigates the workload of sample introduction needle cleaning.
Above are merely preferred embodiments of the utility model, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of this utility model, it can also make several improvements and retouch, these improvements and modifications
Also it should be regarded as the protection scope of the utility model.
Claims (9)
1. a kind of detecting liquid level tracking device for Flow Analyzer, which is characterized in that including for containing sample solution
Sample tube, the sample introduction needle for extracting sample solution, the converter being connect with sample introduction needle, operational amplifier, detector and
The positive input terminal of controller, operational amplifier is connect with converter by first line, the negative input end and electricity of operational amplifier
One end of resistance is grounded by the second connection, the other end of resistance, and the sample tube after sample introduction needle and ground connection forms ground connection
Capacitor, so that sample introduction needle contacts front and back with the sample solution in sample tube, operational amplifier exports different pulses, the inspection
The output end for surveying device and operational amplifier connects, variation of the detector for the pulse of detection calculations amplifier output, institute
It states controller and is connect with detector by tertiary circuit.
2. being used for the detecting liquid level tracking device of Flow Analyzer as described in claim 1, which is characterized in that further include first
One end of adjustable resistance, first adjustable resistance is connected in first line, the other end connection of first adjustable resistance
In on tertiary circuit, so that the first adjustable resistance is in parallel with operational amplifier, detector.
3. being used for the detecting liquid level tracking device of Flow Analyzer as claimed in claim 2, which is characterized in that further include second
One end of adjustable resistance, second adjustable resistance is connected on the second route, the other end connection of second adjustable resistance
In on tertiary circuit, so that the second adjustable resistance is in parallel with operational amplifier, detector.
4. a kind of detecting liquid level tracking device for Flow Analyzer, which is characterized in that including for containing sample solution
Sample tube, the sample introduction needle for extracting sample solution, the converter being connect with sample introduction needle, operational amplifier, detector and
The positive input terminal of controller, operational amplifier is connect with converter by first line, the negative input end and electricity of operational amplifier
By the second connection, the other end of resistance is grounded for one end of resistance, and sample introduction needle includes inner layer sleeve and outer layer sleeve, it is described in
Teflon film, outer layer sleeve ground connection are coated between layer casing and outer layer sleeve, inner layer sleeve and outer layer sleeve form ground connection
Capacitor, so that sample introduction needle contacts front and back with the sample solution in sample tube, operational amplifier exports different pulses, the inspection
The output end for surveying device and operational amplifier connects, variation of the detector for the pulse of detection calculations amplifier output, institute
It states controller and is connect with detector by tertiary circuit.
5. being used for the detecting liquid level tracking device of Flow Analyzer as claimed in claim 4, which is characterized in that further include first
One end of adjustable resistance, first adjustable resistance is connected in first line, the other end connection of first adjustable resistance
In on tertiary circuit, so that the first adjustable resistance is in parallel with operational amplifier, detector, first adjustable resistance is for reducing
The amplification factor of operational amplifier.
6. being used for the detecting liquid level tracking device of Flow Analyzer as claimed in claim 5, which is characterized in that further include second
One end of adjustable resistance, second adjustable resistance is connected on the second route, the other end connection of second adjustable resistance
In on tertiary circuit, so that the second adjustable resistance is in parallel with operational amplifier, detector, second adjustable resistance is for increasing
The amplification factor of operational amplifier.
7. being used for the detecting liquid level tracking device of Flow Analyzer as claimed in claim 6, which is characterized in that further include sample introduction
Arm, the sample introduction arm are installed on the top of sample tube in which can move up and down and rotate left and right, and the sample introduction needle is installed on described
On sample introduction arm, for the sample introduction arm for driving the sample introduction needle up and down and moving left and right, the sample tube is placed on sample disc
On, the sample tube is glass sample test tube or plastic sample test tube, and sample disc is metal sample disk or plastic sample disk.
8. being used for the detecting liquid level tracking device of Flow Analyzer as claimed in claim 7, which is characterized in that the controller
It is separately connected with the motor of the detector and sample introduction arm, the pulse that the controller is used to be exported according to operational amplifier becomes
Change control sample introduction arm to move towards sample tube or far from sample tube.
9. being used for the detecting liquid level tracking device of Flow Analyzer as claimed in claim 8, which is characterized in that the sample introduction needle
Front end be connected with sample introduction syringe needle, the sample introduction needle is stainless steel material sample introduction needle, and sample introduction syringe needle is 5-25 millimeters long, the sample introduction
It is seamlessly connected together between syringe needle and the sample introduction needle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820970436.7U CN208334395U (en) | 2018-06-22 | 2018-06-22 | Detecting liquid level tracking device for Flow Analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820970436.7U CN208334395U (en) | 2018-06-22 | 2018-06-22 | Detecting liquid level tracking device for Flow Analyzer |
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| Publication Number | Publication Date |
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| CN208334395U true CN208334395U (en) | 2019-01-04 |
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ID=64769434
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820970436.7U Active CN208334395U (en) | 2018-06-22 | 2018-06-22 | Detecting liquid level tracking device for Flow Analyzer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI757792B (en) * | 2019-07-17 | 2022-03-11 | 台灣積體電路製造股份有限公司 | Detector, detection device and method of using the same |
-
2018
- 2018-06-22 CN CN201820970436.7U patent/CN208334395U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI757792B (en) * | 2019-07-17 | 2022-03-11 | 台灣積體電路製造股份有限公司 | Detector, detection device and method of using the same |
| US11674919B2 (en) | 2019-07-17 | 2023-06-13 | Taiwan Semiconductor Manufacturing Company Ltd. | Detector, detection device and method of using the same |
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