CN112147086A - Water quality on-line monitoring system capable of configuring measurement process at will - Google Patents
Water quality on-line monitoring system capable of configuring measurement process at will Download PDFInfo
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- CN112147086A CN112147086A CN202011233925.2A CN202011233925A CN112147086A CN 112147086 A CN112147086 A CN 112147086A CN 202011233925 A CN202011233925 A CN 202011233925A CN 112147086 A CN112147086 A CN 112147086A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1813—Water specific cations in water, e.g. heavy metals
Abstract
The invention discloses a water quality on-line monitoring system capable of configuring a measurement process at will, which comprises a power system, a quantitative system, a multi-channel valve, a water sample dilution cup, a plurality of pipe clamp valves, at least one air inlet pipe, at least one flow stopping reaction tank and at least one detector connected to a staying reaction tank, wherein the quantitative system is connected between the power system and the multi-channel valve, and the staying reaction tank is connected to the rear side of the multi-channel valve. On the basis of Flow Injection Analysis (FIA) and Sequential Injection Analysis (SIA), the invention combines the characteristics of reciprocating liquid absorption of sequential injection analysis, unidirectional flow of flow injection analysis, flow stopping reaction mode and the like, not only can effectively reduce the residue of suspended matters and silt in a pipeline, but also can reduce the pollution to a quantitative system and a multi-channel valve, save the volume and the times of pure water cleaning in the pipeline, and has the advantages of small reagent usage amount, small waste liquid amount and high universality.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a water quality online monitoring system capable of configuring a measurement process at will.
Background
The existing online monitoring instrument products generally have the following problems:
firstly, suspended matters and silt in a water sample easily cause pipeline blockage, so that instrument alarm, inaccurate data and frequent fault occur, and great troubles are brought to online monitoring and operation and maintenance work;
secondly, some reaction reagents are high in temperature and concentration, so that safety problems can be caused, and higher requirements are provided for materials used by equipment;
and thirdly, the environment of some water stations is severe, the temperature difference between day and night is large, and water mist and dust are easily generated at the metering part made of glass materials, so that inaccurate metering is caused, or false alarm is caused.
Finally, some water stations have long maintenance periods, which puts higher requirements on the stability and reliability of the instrument, and simultaneously, the reagent dosage and the waste liquid generation amount have more rigorous requirements.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides the water quality on-line monitoring system which is based on Flow Injection Analysis (FIA) and Sequential Injection Analysis (SIA) and combines the characteristics of reciprocating liquid absorption of sequential injection analysis and one-way flow and flow stopping reaction modes of flow injection analysis, and the like, thereby not only effectively reducing the residue of suspended matters and silt in a pipeline, but also reducing the pollution to a quantitative system and a multi-channel valve, saving the volume and the times of pure water cleaning in the pipeline, simultaneously ensuring the residue of various reagents and water samples in a pipeline valve body and showing regular changes due to mutual diffusion and interference, having smaller reagent usage amount, less waste liquid amount and greater universality and being capable of configuring a measurement process at will.
The technical scheme of the invention is as follows: a water quality on-line monitoring system capable of configuring a measurement process at will comprises a power system, a quantitative system, a multi-channel valve, a water sample dilution cup, a plurality of pipe clamp valves, at least one air inlet pipe, at least one flow stopping reaction tank and at least one detector connected to a staying reaction tank, wherein the quantitative system is connected between the power system and the multi-channel valve, the staying reaction tank is connected to the rear side of the multi-channel valve, and the power system is used for pumping liquid or air back and forth and providing stable and reliable power for the whole system; the quantitative system effectively distinguishes water samples, air, reagents and organic solvents according to the signal size, and accurately measures liquid with fixed length or volume; the multi-channel valve is controlled by the control panel to open and close each channel, and different water samples or reagents are selectively extracted to enter the common channel; the flow stopping reaction tank is used for high-temperature digestion of a mixed sample of a water sample and a reagent, and simultaneously, colorimetric detection is carried out on the mixed sample through a detector; the pipe clamp valve is controlled to be opened and closed through a circuit, so that the aim of controlling different flow directions of liquid and air is fulfilled.
On the basis of Flow Injection Analysis (FIA) and Sequence Injection Analysis (SIA), the invention combines the characteristics of reciprocating liquid absorption of sequence injection analysis and one-way flow and flow stopping reaction modes of flow injection analysis, and the like, can effectively reduce the residues of suspended matters and silt in a pipeline, can also reduce the pollution to a quantitative system and a multi-channel valve, saves the volume and the times of pure water cleaning in the pipeline, simultaneously ensures the residues of various reagents and water samples in a pipeline valve body, and ensures that mutual diffusion and interference show regular change, the reagent usage amount is smaller, the waste liquid amount is less, and the universality is higher.
Preferably, the number of the detectors is two, namely a first detector and a second detector, and the number of the residence reaction tank is one, wherein the first detector is installed on the side wall of the residence reaction tank, and the second detector is installed on the rear side of the residence reaction tank.
Preferably, the number of pipe clamp valves is three, is first pipe clamp valve, second pipe clamp valve and third pipe clamp valve respectively, first pipe clamp valve sets up between reaction tank and the multichannel valve that stops, second pipe clamp valve sets up between reaction tank and the second detector that stops, third pipe clamp valve is connected between reaction tank and the driving system that stops, the quantity of air inlet pipe is one, and it connects on third pipe clamp valve.
Preferably, the quantity of pipe clamp valve is four, is first pipe clamp valve, second pipe clamp valve, third pipe clamp valve and fourth pipe clamp valve respectively, first pipe clamp valve sets up and stops between reaction tank and multichannel valve, third pipe clamp valve sets up and stops between reaction tank and the second detector, the quantity of admitting air pipe is three, admits air pipe and third air inlet pipe for first air inlet pipe, second respectively, first air inlet pipe is connected on driving system, the second is admitted air union coupling and is stopped between reaction tank and the second detector, the third is admitted air union coupling and is stopped on the reaction tank, the second pipe clamp valve sets up on the second admits air pipe, fourth pipe clamp valve sets up on the third air inlet pipe.
Preferably, the power system is a peristaltic pump, a syringe pump or a plunger pump; the quantitative system is a combination of a quantitative ring and a capacitance type liquid level meter, a combination of the quantitative ring and a photoelectric type liquid level meter, a combination of the quantitative ring and an ultrasonic type liquid level meter or a weight sensor for measuring the weight or the mass of the liquid.
Preferably, the quantitative system adopts a capacitance type liquid level meter with extremely high sensitivity to judge whether liquid exists or not, effectively distinguishes water samples, air, reagents and organic solvents according to the signal size, is matched with a structure of a quantitative ring principle, accurately measures liquid with fixed length or volume, and injects the liquid into a reaction tank, and the repeatability of liquid taking is less than 0.5%.
Preferably, the multi-channel valve is an electromagnetic valve or a direction selection valve capable of realizing respective sampling of various liquids, the residence reaction tank and the first detector form a digestion and colorimetric integrated tank, and the first detector and the second detector are both photoelectric colorimetric detectors.
Preferably, the whole flow path is designed in an annular mode, a waste liquid discharge port is arranged at the lower end of the flow stopping reaction tank, the quantitative system is formed by combining a quantitative ring and a capacitance type liquid level meter, the accurate liquid volume is obtained through the quantitative ring with the fixed length, the liquid level is judged, and the accuracy of the liquid is ensured by using a capacitance proximity switch which outputs a real-time signal.
Preferably, the quantitative ring adopts a tetrafluoride tube or a peek tube or a PFA tube, the inner diameter is required to be less than 2mm, the tube wall is not less than 1mm, and the length is more than 250mm, so that the sampling accuracy is ensured.
Preferably, the hose used by the pinch valve is an inlet corrosion-resistant Pharmed pipe or Norprene pipe.
On the basis of Flow Injection Analysis (FIA) and Sequence Injection Analysis (SIA), the invention combines the characteristics of reciprocating liquid absorption of sequence injection analysis and one-way flow and flow stopping reaction modes of flow injection analysis, and the like, can effectively reduce the residues of suspended matters and silt in a pipeline, can also reduce the pollution to a quantitative system and a multi-channel valve, saves the volume and the times of pure water cleaning in the pipeline, simultaneously ensures the residues of various reagents and water samples in a pipeline valve body, and ensures that mutual diffusion and interference show regular change, the reagent usage amount is smaller, the waste liquid amount is less, and the universality is higher.
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic structural view of example 2 of the present invention;
FIG. 3 is a schematic structural diagram of embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the scope of the present invention is not limited thereto.
Example 1
As shown in fig. 1, an online water quality monitoring system capable of configuring a measurement process at will comprises a power system, a quantitative system, a multi-channel valve, a water sample dilution cup, three pipe clamp valves, an air inlet pipe, a flow stopping reaction tank and two detectors connected to the stay reaction tank, wherein the quantitative system is connected between the power system and the multi-channel valve, the stay reaction tank is connected to the rear side of the multi-channel valve, and the power system is used for pumping liquid or air back and forth to provide stable and reliable power for the whole system; the quantitative system effectively distinguishes water samples, air, reagents and organic solvents according to the signal size, and accurately measures liquid with fixed length or volume; the multi-channel valve is controlled by the control panel to open and close each channel, and different water samples or reagents are selectively extracted to enter the common channel; the flow stopping reaction tank is used for high-temperature digestion of a mixed sample of a water sample and a reagent, and simultaneously, colorimetric detection is carried out on the mixed sample through a detector; the pipe clamp valve is controlled to be opened and closed through a circuit, so that the aim of controlling different flow directions of liquid and air is fulfilled. The two detectors are respectively a first detector and a second detector, the first detector is arranged on the side wall of the stay reaction tank, and the second detector is arranged on the rear side of the stay reaction tank. Three pipe clamp valves are first pipe clamp valve, second pipe clamp valve and third pipe clamp valve respectively, first pipe clamp valve sets up and stops between reaction tank and the multichannel valve, the second pipe clamp valve sets up and stops between reaction tank and second detector, the third pipe clamp valve is connected and is stopped between reaction tank and driving system, the quantity of air inlet pipe is one, and it is connected on the third pipe clamp valve. The multi-channel valve is an electromagnetic valve capable of realizing respective sampling of various liquids, the reaction tank and the first detector form a digestion and colorimetric integrated tank, and the first detector and the second detector are both photoelectric colorimetric detectors.
Example 2
As shown in fig. 2, the number of pipe clamp valves is four, is first pipe clamp valve, second pipe clamp valve, third pipe clamp valve and fourth pipe clamp valve respectively, first pipe clamp valve sets up and stops between reaction tank and the multichannel valve, third pipe clamp valve sets up and stops between reaction tank and the second detector, the quantity of admitting air pipe is three, admits air pipe and third air inlet pipe for first air inlet pipe, second respectively, first air inlet pipe connects on driving system, the second is admitted air union coupling and is being stopped between reaction tank and the second detector, the third is admitted air union coupling and is being stopped on reaction tank, the second pipe clamp valve sets up on the second admits air pipe, fourth pipe clamp valve sets up on the third air inlet pipe.
Example 3
As shown in figure 3, the COD single parameter measurement flow path for the micro water station comprises a peristaltic pump, a multi-channel valve and three pipe clamp valves. The whole flow path adopts an annular flow path structure, so that liquid can be extracted and can be discharged in a positive pressure mode. The annular flow path structure is adopted, waste liquid is directly discharged, and a common channel through which a water sample and a reagent flow is controlled by a pipe clamp valve and a hose. The hose is made of corrosion-resistant materials. The system adopts a mode of matching a capacitive proximity switch with a quantitative ring to accurately measure the volume of the liquid. The quantitative system adopts a capacitance type liquid level meter with extremely high sensitivity to judge whether liquid exists or not, effectively distinguishes water samples, air, reagents and organic solvents according to the signal size, is matched with the structure of a quantitative ring principle, accurately measures liquid with fixed length or volume, and injects the liquid into a reaction tank, and the repeatability of liquid taking is less than 0.5%. Whole flow path adopts the annular design, stops that reaction tank and detector constitute and clears up the integrative pond of color comparison to at the lower extreme of stopping flowing reaction tank, install a waste liquid discharge port, quantitative system adopts ration ring and capacitanc level gauge combination, obtains accurate liquid volume through the ration ring of fixed length, and the liquid level has or not judgement, uses real-time signal output's electric capacity proximity switch, guarantees that liquid has or not accuracy. The quantitative ring adopts a tetrafluoride tube or a peek tube or a PFA tube, the inner diameter is required to be less than 2mm, the tube wall is not less than 1mm, and the length is greater than 250mm, so that the sampling accuracy is ensured. The hose adopted by the pipe clamp valve is an inlet corrosion-resistant Pharmed pipe or Norprene pipe.
In order to obtain more stable and reliable data, a mode that a water sample and a reagent flow in a single direction and are directly discharged from the other end is adopted to realize the transportation of the whole flow path. The water sample only gets into quantitative system at the sample in-process, and at the flowing back in-process, the reaction waste liquid is not taken back the pump, avoids because a large amount of suspended solids and silt, passes through in the pipeline repeatedly. In addition, the mode of adopting the pipe clamp valve, the incoming flow is through water sample and reagent, can avoid suspended solid and silt to have too much residue in the valve way, causes the jam phenomenon.
In addition, the liquid level is judged by adopting a capacitance type liquid level meter, so that the problems of metering error, metering error and the like caused by the quality of water to a quantitative system can be better avoided.
The invention is mainly applied to the fields of surface water, urban domestic sewage, rural sewage, industrial wastewater and the like; the air is used as a current carrying, online sampling and online dilution of a water sample are realized through a quantitative system and a multi-channel valve, and meanwhile, online quantitative sampling of various reagents, pure water and standard samples is realized. The liquid such as water sample, diluted water sample, reagent, pure water, standard sample and the like and the air current are mixed, reacted and digested together in a flow stopping reaction tank, then the quantitative or qualitative analysis is carried out through a first detector, a second detector and the like, and finally the waste liquid is discharged.
The power system in the invention can be a peristaltic pump, and can also be a power system which can realize reciprocating pumping motion, such as a syringe pump, a plunger pump and the like. The quantitative system mainly realizes the accurate measurement of liquid, and can be used for accurately measuring the volume of the liquid by a quantitative ring, a capacitance type, a photoelectric type, an ultrasonic type and the like, and can also be used for accurately measuring the weight or the mass of the liquid. The multi-channel valve realizes the respective sampling of various liquids by means of an electromagnetic valve or a direction selection valve and the like. The number of the channels of the multi-channel valve is not limited and is determined according to actual requirements. The flow stopping reaction tank mainly realizes mixing and reaction among various liquids, and can also perform operation treatments such as heating, illumination, microwave, ultrasonic oscillation and the like on the liquids in an external mode. The flow stopping reaction tank can also carry out different operation treatments on the liquid according to the liquid sequence relation. The mode and time of the operation processing can be freely controlled by program software. The first detector and the second detector can be arranged on two sides of the flow stopping reaction tank or at the rear end of the flow stopping reaction tank according to detection parameters and characteristics of the device.
The invention has the characteristics that:
1) the water sample and the reagents flow in one direction under the pushing of air, so that the pollution to a quantitative system and a multi-channel valve can be reduced, the volume and the times of pure water cleaning in the pipeline are saved, and the residue, mutual diffusion and interference of various reagents and the water sample in the pipeline valve body are guaranteed to present regular changes.
2) On the pipeline of air + liquid one-way flow, can install a plurality of arbitrary stall reaction tanks in theory, can carry out the preliminary treatment many times to the water sample, perhaps carry out the same preliminary treatment reaction simultaneously to a plurality of water samples, improve detection efficiency, simplify the flow path design, practice thrift waste liquid exhaust time.
3) According to the characteristics of the detector, the detector can be arranged on two sides of the flow stopping reaction tank and designed into a reaction and detection integrated tank, or the detector can be arranged at the rear end of the flow stopping reaction tank, for example, after a water sample is digested, an electrolytic tank of anodic stripping voltammetry is arranged at the rear end of the flow stopping reaction tank, and a series of heavy metal detection can be carried out; or a flow-through colorimetric pool is arranged at the rear end of the flow stopping reaction pool, so that the optical path of detection is increased, and the detection limit is improved.
4) Reagent, water sample unidirectional flow can reduce the single use amount of reagent through the mode that water sample or pure water washed, reduces the final volume that produces of waste liquid.
Claims (10)
1. A water quality on-line monitoring system capable of configuring a measurement process at will is characterized in that: the device comprises a power system, a quantitative system, a multi-channel valve, a water sample dilution cup, a plurality of pipe clamp valves, at least one air inlet pipe, at least one flow stopping reaction tank and at least one detector connected to the stay reaction tank, wherein the quantitative system is connected between the power system and the multi-channel valve, the stay reaction tank is connected to the rear side of the multi-channel valve, and the power system is used for pumping liquid or air back and forth and providing stable and reliable power for the whole system; the quantitative system effectively distinguishes water samples, air, reagents and organic solvents according to the signal size, and accurately measures liquid with fixed length or volume; the multi-channel valve is controlled by the control panel to open and close each channel, and different water samples or reagents are selectively extracted to enter the common channel; the flow stopping reaction tank is used for high-temperature digestion of a mixed sample of a water sample and a reagent, and simultaneously, colorimetric detection is carried out on the mixed sample through a detector; the pipe clamp valve is controlled to be opened and closed through a circuit, so that the aim of controlling different flow directions of liquid and air is fulfilled.
2. The water quality on-line monitoring system capable of being configured with a measurement process at will as claimed in claim 1, wherein: the number of the detectors is two, namely a first detector and a second detector, the number of the stay reaction tanks is one, the first detector is arranged on the side wall of the stay reaction tank, and the second detector is arranged on the rear side of the stay reaction tank.
3. The water quality on-line monitoring system capable of being configured with a measurement process at will as claimed in claim 2, wherein: the quantity of pipe clamp valve is three, is first pipe clamp valve, second pipe clamp valve and third pipe clamp valve respectively, first pipe clamp valve sets up and stops between reaction tank and multichannel valve, the second pipe clamp valve sets up and stops between reaction tank and second detector, the third pipe clamp valve is connected and is stopped between reaction tank and driving system, the quantity of air inlet pipe is one, and it is connected on the third pipe clamp valve.
4. The water quality on-line monitoring system capable of being configured with a measurement process at will as claimed in claim 2, wherein: the quantity of pipe clamp valve is four, is first pipe clamp valve, second pipe clamp valve, third pipe clamp valve and fourth pipe clamp valve respectively, first pipe clamp valve sets up and stops between reaction tank and multichannel valve, third pipe clamp valve sets up and stops between reaction tank and second detector, the quantity of air inlet pipe is three, advances the air pipe for first air inlet pipe, second respectively and advances the air pipe and the third advances the air pipe, first air inlet pipe is connected on driving system, the second advances the air pipe and connects between stopping reaction tank and second detector, the third advances the air piping connection on stopping reaction tank, the second pipe clamp valve sets up on the second advances the air pipe, fourth pipe clamp valve sets up on the third advances the air pipe.
5. The water quality on-line monitoring system capable of being configured with a measurement process at will according to claim 3 or 4, characterized in that: the power system is a peristaltic pump, an injection pump or a plunger pump; the quantitative system is a combination of a quantitative ring and a capacitance type liquid level meter, a combination of the quantitative ring and a photoelectric type liquid level meter, a combination of the quantitative ring and an ultrasonic type liquid level meter or a weight sensor for measuring the weight or the mass of the liquid.
6. The water quality on-line monitoring system capable of being configured with a measurement process at will as claimed in claim 5, wherein: the quantitative system adopts the capacitance type liquid level meter with extremely high sensitivity to judge whether liquid exists or not, effectively distinguishes water samples, air, reagents and organic solvents according to the signal size, is matched with the structure of a quantitative ring principle, accurately measures liquid with fixed length or volume, and injects the liquid into a reaction tank, wherein the repeatability of liquid taking is less than 0.5%.
7. The water quality on-line monitoring system capable of being configured with a measurement process at will according to claim 3 or 4, characterized in that: the multi-channel valve is an electromagnetic valve or a direction selection valve which can realize the respective sampling of various liquids, the retention reaction tank and the first detector form a digestion and colorimetric integrated tank, and the first detector and the second detector are both photoelectric colorimetric detectors.
8. The water quality on-line monitoring system capable of being configured with a measurement process at will according to claim 3 or 4, characterized in that: the whole flow path is designed in an annular mode, a waste liquid discharge port is installed at the lower end of the flow stopping reaction tank, the metering module is formed by combining a quantitative ring and a capacitance type liquid level meter, the accurate liquid volume is obtained through the quantitative ring with the fixed length, the liquid level is judged to be accurate, and the accuracy of the liquid is guaranteed to be accurate by using a capacitance proximity switch output by real-time signals.
9. The water quality on-line monitoring system capable of being configured with a measurement process at will as claimed in claim 8, wherein: the quantitative ring adopts a tetrafluoride tube or a peek tube or a PFA tube, the inner diameter is required to be less than 2mm, the tube wall is not less than 1mm, and the length is greater than 250mm, so that the sampling accuracy is ensured.
10. The water quality on-line monitoring system capable of being configured with a measurement process at will as claimed in claim 8, wherein: the hose adopted by the pipe clamp valve is an inlet corrosion-resistant Pharmed pipe or Norprene pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011233925.2A CN112147086A (en) | 2020-11-06 | 2020-11-06 | Water quality on-line monitoring system capable of configuring measurement process at will |
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| CN202011233925.2A CN112147086A (en) | 2020-11-06 | 2020-11-06 | Water quality on-line monitoring system capable of configuring measurement process at will |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858425A (en) * | 2021-01-18 | 2021-05-28 | 江西力沃德科技有限公司 | Acidity analyzer |
| CN116447101A (en) * | 2023-04-24 | 2023-07-18 | 国家海洋技术中心 | Multi-position one-way integrated pump valve |
-
2020
- 2020-11-06 CN CN202011233925.2A patent/CN112147086A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858425A (en) * | 2021-01-18 | 2021-05-28 | 江西力沃德科技有限公司 | Acidity analyzer |
| CN116447101A (en) * | 2023-04-24 | 2023-07-18 | 国家海洋技术中心 | Multi-position one-way integrated pump valve |
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