CN212780522U - Portable water quality analyzer for soluble organic matters and turbidity - Google Patents
Portable water quality analyzer for soluble organic matters and turbidity Download PDFInfo
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- CN212780522U CN212780522U CN202021409102.6U CN202021409102U CN212780522U CN 212780522 U CN212780522 U CN 212780522U CN 202021409102 U CN202021409102 U CN 202021409102U CN 212780522 U CN212780522 U CN 212780522U
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model relates to a water quality analysis detects technical field, discloses a portable solubility organic matter and turbidity water quality analyzer. The device comprises a shell, a cassette and an optical detection assembly arranged in the cassette, wherein the optical detection assembly comprises a cuvette with four light transmission surfaces, and an ultraviolet LED light source module, a visible light LED light source module, a fluorescence light intensity detection module and a scattering light intensity detection module which are respectively arranged corresponding to each light transmission surface of the cuvette, the ultraviolet LED light source module and the visible light LED light source module are arranged oppositely, and the fluorescence light intensity detection module and the scattering light intensity detection module are arranged oppositely. The utility model discloses utilize ultraviolet LED to arouse aquatic organic matter and produce fluorescence signal and reflect the concentration of solubility organic matter, the visible light that sends simultaneously through visible light LED meets the particulate matter and takes place the scattering and realize the detection to aquatic turbidity to satisfy the on-the-spot short-term test demand of solubility organic matter and turbidity.
Description
Technical Field
The utility model relates to the online water quality monitoring technique in environmental analysis detection area, concretely relates to portable water quality analyzer based on two light source fluorescence methods of ultraviolet LED and visible light LED and scattered light can realize the short-term test to the fluorescence class organic matter concentration and the turbidity index of aquatic dissolubility.
Background
Soluble organic matter (DOM), colloids and particulate matter are ubiquitous in various natural waters and sewages. Soluble organics are the main contributors to the Chemical Oxygen Demand (COD) and soluble organic carbon (DOC) indicators, while the content of suspended solids and colloids such as soil, gravel, plankton and the like in water is measured by the turbidity indicator.
Methods for analyzing and detecting the DOM concentration level mainly include chemical methods and spectroscopic methods. Wherein the chemical method mainly comprises a chemical oxygen demand test and a total organic carbon test; and the spectroscopic method includes an ultraviolet absorbance method and a fluorescence spectroscopy method. The ultraviolet absorbance mainly utilizes the ultraviolet absorption of the soluble organic matters at 254nm, and the fluorescence spectroscopy mainly utilizes the protein fluorescence with the emission wavelength of 340 +/-20 nm and the humus fluorescence with the emission wavelength of 450 +/-30 nm after the soluble organic matters in water are excited by ultraviolet light. Recent studies show that the fluorescence of the humus has good linear correlation with the ultraviolet absorbance at 254 nm. Although the chemical method is widely adopted in national or industrial standards, the online monitoring equipment has the advantages of complex structure, larger volume, high price, long test period, chemical reagent requirement, secondary chemical pollution and high operation and maintenance and waste liquid treatment cost; the spectrum method has the advantages of simplicity, rapidness, no need of chemical reagents and the like, and the China Water conservancy enterprises Association publishes technical guide of the spectrum method water quality on-line monitoring system T/CWEC 13-2019, so that the feasibility of the spectrum method in the field of on-line monitoring of the chemical oxygen demand water quality index is determined.
The turbidity index is one of indexes which can be directly observed and sensed by people, and is also one of the conventional five parameters in the field of water monitoring at present. The turbidity test method mainly comprises a turbidimetry (visible light absorption) method or a scattered light method, and both a visible wavelength absorbance method and a scattered light method are the main methods of the current turbidimeter.
In summary, the water quality indexes of soluble organic matters and turbidity can be rapidly detected by the spectrometry. At present, the commercially applied spectroscopy equipment reflecting the DOM concentration level mainly adopts a pulsed xenon lamp light source or a low-pressure mercury lamp light source. For example, a low-pressure mercury lamp is used as a light source, and ultraviolet absorbance (UV254) at a wavelength of 254nm is measured as an alternative index of chemical oxygen demand; a pulse xenon lamp light source is adopted, and the analysis and detection of indexes such as nitrate concentration, DOM concentration, turbidity and the like are realized by testing the ultraviolet-visible absorption luminosity of the 200-750nm wave band. However, the water quality monitoring device or probe based on the low-pressure mercury lamp or pulse xenon lamp light source has the problems of large volume and high power consumption. In particular, such devices require a specific power source, and development of portable handheld products is difficult to achieve.
The light emitting diode LED has the advantages of small volume, low power consumption, low cost, good monochromaticity, low operating voltage, high-speed and frequent switching and the like. In particular, in recent years, the deep ultraviolet LED technology has been commercialized, and provides a novel light source technology for water quality detection by spectroscopy. The invention patent with application number 201910035691.1 discloses a double-fluorescence signal and turbidity water quality monitoring probe based on an LED light source and a use method thereof, the invention adopts a 280 plus or minus 10nm deep ultraviolet LED chip and a 465 plus or minus 10nm blue light LED chip for composite packaging, the two LED chips work alternately, the emitted deep ultraviolet light excites a water sample to generate protein fluorescence and humus fluorescence with two emission wavelengths, and the protein fluorescence and the humus fluorescence are respectively detected by a silicon photodiode in combination with two band-pass filters 330 and 400-doped 500 nm; the scattered light generated when the emitted blue light meets the particles or the colloid is detected by the silicon photodiode through the 400-nm and 500-nm band-pass filter. The invention is characterized in that (1) a composite packaging LED light source is adopted, and (2) the silicon photodiode containing the 400-plus 500nm band-pass filter has double functions, so that the fluorescence of humus can be detected, and the turbidity can be detected through the scattered light of blue light. The invention is designed in a probe type, the composite packaging cost of the blue light LED chip and the deep ultraviolet LED chip is higher, and the turbidity detection cannot be carried out by adopting other visible light wavelengths because a channel is multiplexed by adopting fluorescence detection and blue light scattered light detection.
The invention patent with the application number of 201910932111.9 discloses a portable rapid water quality detector and a water quality detection method, and the method of the application mainly adopts a deep ultraviolet LED with the central wavelength within the range of 250-300 nm to realize the synchronous rapid detection of ultraviolet absorbance indexes, protein fluorescence and humus fluorescence of soluble organic matters. The deep ultraviolet LED with the central wavelength of 250-300 nm is mainly adopted, the LED is packaged by TO39 with a quartz lens, and the price is still high; in addition, the electro-optic conversion efficiency of the deep ultraviolet LED chip is still low, about 2%, the generated heat affects the light intensity stability of the LED, and therefore, a light source detection module needs to be arranged to correct the light intensity change of the light source. In addition, to the on-the-spot quick detection demand of aquatic dissolubility organic matter and turbidity, the device does not have the turbidity and detects the function, restricts its more extensive application.
Disclosure of Invention
1. Problems to be solved
To aquatic dissolubility organic matter and turbid on-spot short-term test demand, the utility model aims at providing a portable water quality analyzer based on two light sources of ultraviolet LED and visible light LED, through setting up optical detection subassembly into ultraviolet LED light source module, visible light LED light source module and two light intensity detection modules correspond the light transmission face that the cell is different respectively, wherein ultraviolet LED light source module is relative with visible light LED light source module, two light intensity detection module relative structures, utilize ultraviolet LED to arouse aquatic organic matter and produce the concentration that fluorescence signal reflects dissolubility organic matter, the visible light scattering that utilizes visible light LED to send simultaneously realizes the detection to aquatic turbidity, thereby make dissolubility organic matter and turbidity on-spot test go on in step, the detection efficiency is greatly improved, expand the range of application.
2. Technical scheme
In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:
the invention provides a portable water quality analyzer for soluble organic matters and turbidity, which comprises a shell, a hidden box and an optical detection assembly arranged in the hidden box, wherein the optical detection assembly comprises a cuvette with four light transmission surfaces, and an ultraviolet LED light source module, a visible light LED light source module, a fluorescence light intensity detection module and a scattered light intensity detection module which are respectively arranged corresponding to each light transmission surface of the cuvette, the ultraviolet LED light source module and the visible light LED light source module are oppositely arranged, and the fluorescence light intensity detection module and the scattered light intensity detection module are oppositely arranged.
Preferably, the cassette comprises a cassette cover positioned at the upper part and a cassette body positioned at the lower part, and a square opening for inserting the cuvette into the cassette is arranged on the cassette cover; the ultraviolet LED light source module, the visible light LED light source module, the fluorescence light intensity detection module and the scattering light intensity detection module are fixed inside the cassette body.
In a preferred scheme, the fluorescence light intensity detection module and the scattered light intensity detection module respectively comprise a circuit board, a silicon photodiode fixedly arranged on the circuit board, a fixing part and a band-pass filter, and the band-pass filter is fixed on the silicon photodiode through the fixing part.
Preferably, the central wavelength of the ultraviolet LED light source is 365 +/-10 nm, and the packaging form of the ultraviolet LED light source can be TO18 metal packaging, TO39 metal packaging, F3 plastic packaging or F5 plastic packaging, and more preferably, TO39 metal packaging is adopted.
Preferably, the visible light LED light source has a center wavelength of 680 ± 20nm (red), 620 ± 20nm (orange-red) or 550 ± 20 (green), and the package form may be TO18 metal package, TO39 metal package, F3 plastic package or F5 plastic package, and more preferably, the 680nm red LED packaged by TO18 metal is adopted.
In a preferred embodiment, the bandpass wavelength range of the bandpass filter corresponding to the fluorescence intensity detection module is 400-500nm, and/or the bandpass wavelength range of the bandpass filter corresponding to the scattering intensity detection module is 650-700nm, 600-650nm, or 525-575nm, which is matched with the wavelength of the adopted visible light LED light source.
In a preferred scheme, the operational amplification circuit comprises two stages of operational amplification chips, wherein the first stage of operational amplification chip adopts a transimpedance operational amplification form, and the second stage of operational amplification chip adopts an inverse operational amplification form; the fluorescence light intensity detection module is used for detecting a fluorescence signal generated by exciting a soluble organic matter in water by ultraviolet light, the band-pass wavelength range of a corresponding optical filter is 400-1000 Mohm, and the resistance range of a feedback resistor used by the transimpedance operational amplification circuit is 200-1000 Mohm; the scattered light intensity detection module is used for detecting the intensity of scattered light in the vertical direction generated by the visible light LED irradiating particles, the band-pass wavelength range of the corresponding optical filter is matched with the wavelength of the adopted visible light LED, and the resistance value range of the feedback resistor used by the transimpedance operational amplification circuit is 10-200M omega.
Preferably, the circuit main board comprises a single chip microcomputer, a key circuit, a power management circuit, a display screen driving circuit, a bluetooth module, a buzzer, an LED driving control circuit and a DC-DC boost circuit, and more preferably, the ultraviolet LED and visible light LED driving control circuit adopts a bright microelectronic SM32105E chip.
In the preferable scheme, the ultraviolet LED and the visible light LED adopt an alternate stroboscopic mode, and in the working period of the ultraviolet LED, a singlechip on a circuit mainboard collects an electric signal generated by a fluorescence signal light intensity detection module; when the visible light LED works, the single chip microcomputer on the circuit main board collects electric signals generated by the scattered light intensity detection module.
Preferably, the shell comprises an upper shell and a lower shell, the upper shell is provided with a square hole for inserting the cuvette and a shading cover for opening and closing the square hole, and the square hole corresponds to the square opening below the cuvette.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a portable dissolubility organic matter and turbidity water quality analyzer excites the aquatic organic matter through the ultraviolet LED that central wavelength is 365 10nm and produces the concentration that 400 supplyes blood the fluorescent signal in the 500nm wavelength range and reflect the dissolubility organic matter, and the visible light scattering that sends through red wavelength LED or green wavelength LED realizes the detection to aquatic turbidity, has a tractor serves two-purpose, and synchronous detection's characteristics satisfies the on-the-spot short-term test demand of dissolubility organic matter and turbidity.
(2) The utility model discloses a portable solubility organic matter and turbidity water quality analyzer, from the principle of solubility organic matter and turbidity detection, combine two kinds of detection methods through simple setting, set up ultraviolet LED light source module respectively through around the cell, visible light LED light source module and two light intensity detection module, make above-mentioned module correspond different printing opacity faces respectively, and make ultraviolet LED light source module, visible light LED light source module corresponds the setting, two light intensity detection module correspond and set up and realize solubility organic matter and turbid synchronous detection analysis, holistic compact structure, it is less to occupy the volume, the utilization is promoted.
(3) The utility model discloses a portable solubility organic matter and turbidity water quality analyzer, to humus fluorescence signal detection, adopt 365nm LED to replace 275nm LED light source that adopts usually among the prior art as the light source, because the absorbance of solubility organic matter at 365nm is less, it is little that consequently adopt 365nm LED to receive inside covering effect interference as the light source, have the linear detection scope of higher concentration, on the other hand, because 365nm LED is high and the heat production is little than 275nm LED's luminous efficacy, light source intensity is more stable, need not light source intensity calibration.
(4) The utility model discloses a portable solubility organic matter and turbidity water quality analyzer adopts independent ultraviolet LED and visible LED light source, and the cost of manufacture is lower than compound encapsulation's multi-wavelength LED, and realizes independent control and device change easily.
Drawings
FIG. 1 is a schematic diagram of the housing and the internal structure of a portable water quality analyzer for dissolved organic substances and turbidity in example 1;
FIG. 2 is a view of a cassette and an optical detection assembly;
FIG. 3 is a diagram of the position relationship of the optical inspection assembly;
FIG. 4 is a schematic diagram of a light intensity detection module;
in the figure: 11. an upper housing; 12. a lower housing; 13. a light-shielding cover; 14. pressing a key; 15. a light guide pillar; 16. acrylic plates; 17. a support plate; 18. a fixing plate; 19. a cassette cover; 20. a cassette body; 21. a cuvette; 22. an ultraviolet LED light source module; 23. a visible light LED light source module; 24. the device comprises fluorescent light intensity detection modules 25, scattered light intensity detection modules 31 and a circuit board; 32. a silicon photodiode; 33. a band-pass filter; 34. and a fixing component.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1, the portable water quality analyzer for dissolved organic substances and turbidity in the present embodiment includes a housing, a battery, a button 14, a display screen, a circuit board, a light guide column 15, an acrylic plate 16, a support plate 17, a fixing plate 18, and a cassette.
The housing includes an upper housing 11 and a lower housing 12, and the upper housing is provided with a square hole and a light shielding cover 13 for opening and closing the square hole.
The acrylic plate 16 and the display screen are fixed on the upper shell 11 through the supporting plate 17, the acrylic plate 16 plays a waterproof protection role for the display screen, the keys 14 and the circuit main board are fixed on the upper shell 11 through screws, and the battery is fixed on the lower shell 12 through the fixing plate 18.
The keys 14 include a power key, a return key, a menu key, a save key, a measurement key and a zero calibration key, and the light guide column 15 is used for guiding out an indicator light source on the circuit main board to indicate key response and charging state.
As shown in FIG. 2, the optical detection assembly is located in the camera bellows and includes a cuvette 21 having four light-transmitting surfaces, an ultraviolet LED light source module 22, a visible LED light source module 23, a fluorescence intensity detection module 24, and a scattered light intensity detection module 25. As shown in fig. 3, the ultraviolet LED light source module 22, the visible light LED light source module 23, the fluorescence light intensity detection module 24, and the scattered light intensity detection module 25 are fixed around the cuvette 21 and respectively correspond to different light transmission surfaces, wherein the ultraviolet LED light source module 22 and the visible light LED light source module 23 are disposed opposite to each other, and the fluorescence light intensity detection module 24 and the scattered light intensity detection module 25 are disposed opposite to each other.
The cassette comprises a cassette cover 19 and a cassette body 20, the cassette is made of black plastic materials and has the functions of shading light and fixing, a square opening is arranged on the cassette cover 19 and is opposite to the square opening in position, and the square opening is used for enabling the cuvette 21 to be inserted into the cassette from the upper part when the shading cover 13 is opened; the cassette body 20 below is provided with a fixing slot position, and plays a role in fixing the ultraviolet LED light source module 22, the visible light LED light source module 23, the fluorescence light intensity detection module 24 and the scattered light intensity detection module 25.
The central wavelength of the ultraviolet LED light source is 365 +/-10 nm, the packaging form is TO39 metal packaging, as the adopted ultraviolet wavelength can penetrate through K9 glass, and the lens material at the front end of the TO39 metal packaging can adopt K9 glass TO replace quartz, the packaging cost is reduced.
The visible light LED light source is a 680nm red LED, the packaging form of the visible light LED light source is TO18 metal packaging, the light emitting angle of the packaging is less than 5 degrees, and scattered light of the light source can be reduced.
As shown in fig. 4, the fluorescence intensity detecting module 24 and the scattered intensity detecting module 25 respectively include a circuit board 31, a silicon photodiode 32 fixed on the circuit board, a band pass filter 33, and a fixing member 34.
The circuit board 31 is printed with an operational amplifier circuit which comprises two stages of operational amplifier chips, wherein the first stage of operational amplifier chip adopts OPA129 and adopts a transimpedance operational amplifier form, and the second stage of operational amplifier chip is OPA227 and adopts an inverse operational amplifier form; the fixing member 34 is a fixing dome which fixes the band pass filter 33 on the silicon photodiode 32.
The fluorescence light intensity detection module 24 is used for detecting a fluorescence signal generated by exciting a soluble organic matter in water by ultraviolet light, the band-pass wavelength range of the corresponding band-pass filter 33 is 400-500nm, and the resistance value of a feedback resistor used by the transimpedance operational amplification circuit is 500 MOmega; the scattered light intensity detection module 25 is configured to detect the intensity of scattered light in a vertical direction generated when the visible light LED irradiates the particulate matter, the bandpass wavelength range of the corresponding bandpass filter 33 is 650-700nm, and the resistance value of the feedback resistor used by the transimpedance operational amplification circuit is 100M Ω.
The circuit main board comprises a single chip microcomputer, a key circuit, a power management circuit, a display screen driving circuit, a Bluetooth module, a buzzer, an LED driving control circuit and a DC-DC booster circuit, wherein the ultraviolet LED and visible light LED driving control circuit adopts a bright micro-electronic SM32105E chip, the reference voltage of the chip is 170mV, the ultraviolet LED driving control circuit adopts a 4 omega reference resistor, the current of the ultraviolet LED driving control circuit is about 40mA, the red light LED driving control circuit adopts a 16 omega reference resistor, and the current of the red light LED driving control circuit is about 10 mA. The ultraviolet LED and the visible light LED adopt an alternate stroboscopic mode, and in the working period of the ultraviolet LED, a singlechip on a circuit mainboard collects an electric signal generated by the fluorescence signal light intensity detection module 24; when the visible light LED works, the single chip microcomputer on the circuit main board collects an electric signal generated by the scattered light intensity detection module 25.
Example 2
This embodiment is basically the same as embodiment 1 except that:
the central wavelength of the ultraviolet LED light source is 365 +/-10 nm, the packaging form is TO18 metal packaging, and the resistance value of a feedback resistor used by the transimpedance operational amplification circuit in the fluorescent light intensity detection module 24 is 1G omega.
The visible light LED light source is a 620nm orange red LED, and the packaging form of the visible light LED light source is TO39 metal packaging. The band-pass wavelength range of the optical filter 33 adopted by the scattered light intensity detection module 25 is 600-650nm, and the resistance value of the feedback resistor used by the transimpedance operational amplification circuit is 200 MOmega.
Example 3
This embodiment is basically the same as embodiment 1 except that:
the central wavelength of the ultraviolet LED light source is 365 +/-10 nm, and the packaging form is F5 plastic packaging.
The visible light LED light source is a 550nm green LED, and the packaging form is F3 plastic packaging. The band-pass wavelength range of the optical filter 33 adopted by the scattered light intensity detection module 25 is 525-575 nm.
Claims (10)
1. The utility model provides a portable solubility organic matter and turbidity water quality analyzer, includes shell, magazine and sets up the inside optical detection subassembly in the magazine, its characterized in that: the optical detection assembly comprises a cuvette (21) with four light transmission surfaces and an ultraviolet LED light source module (22), a visible light LED light source module (23), a fluorescent light intensity detection module (24) and a scattered light intensity detection module (25) which are respectively arranged corresponding to each light transmission surface of the cuvette (21), wherein the ultraviolet LED light source module (22) is arranged opposite to the visible light LED light source module (23), and the fluorescent light intensity detection module (24) and the scattered light intensity detection module (25) are arranged opposite to each other.
2. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 1, characterized in that: the cassette comprises a cassette cover (19) positioned at the upper part and a cassette body (20) positioned at the lower part, and a square opening for inserting a cuvette (21) is arranged on the cassette cover (19); the ultraviolet LED light source module (22), the visible light LED light source module (23), the fluorescence light intensity detection module (24) and the scattered light intensity detection module (25) are fixed inside the cassette body (20).
3. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 1 or 2, characterized in that: fluorescence light intensity detection module (24) and scattered light intensity detection module (25) include circuit board (31), silicon photodiode (32), fixed part (34) and band pass filter (33) that fixed set up on circuit board (31) respectively, band pass filter (33) are fixed on silicon photodiode (32) through fixed part (34).
4. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 3, characterized in that: the central wavelength of the ultraviolet LED light source is 365 +/-10 nm, and/or the packaging form of the ultraviolet LED light source comprises TO18 metal packaging, TO39 metal packaging, F3 plastic packaging or F5 plastic packaging.
5. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 4, wherein: the central wavelength of the visible light LED light source comprises 680 +/-20 nm, 620 +/-20 nm or 550 +/-20.
6. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 5, wherein: the packaging form of the visible light LED light source comprises TO18 metal packaging, TO39 metal packaging, F3 plastic packaging or F5 plastic packaging.
7. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 5, wherein: the band-pass wavelength range of the band-pass filter (33) corresponding to the fluorescence light intensity detection module (24) is 400-500nm, and/or the band-pass wavelength range of the band-pass filter (33) corresponding to the scattering light intensity detection module (25) is 650-700nm, 600-650nm or 525-575nm, and is matched with the wavelength of the adopted visible light LED light source.
8. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 3, characterized in that: the circuit board (31) is printed with an operational amplification circuit, the amplification circuit comprises two stages of operational amplification chips, the first stage of operational amplification chip adopts a transimpedance operational amplification form, and the second stage of operational amplification chip adopts an inverse operational amplification form.
9. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 8, wherein: the resistance range of a feedback resistor used by a primary operational amplification chip of the fluorescence light intensity detection module (24) is 200-1000 MOmega; the resistance range of a feedback resistor used by a secondary operational amplification chip of the scattered light intensity detection module (25) is 10-200M omega.
10. The portable water quality analyzer for dissolved organic matters and turbidity according to claim 2, characterized in that: the shell includes upper portion shell (11) and lower part shell (12), be equipped with on upper portion shell (11) and be used for the quad slit of inserting cell (21) and be used for the shading lid (13) of quad slit switching, the quad slit corresponds with the square mouth of below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021409102.6U CN212780522U (en) | 2020-07-16 | 2020-07-16 | Portable water quality analyzer for soluble organic matters and turbidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021409102.6U CN212780522U (en) | 2020-07-16 | 2020-07-16 | Portable water quality analyzer for soluble organic matters and turbidity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212780522U true CN212780522U (en) | 2021-03-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102022107746A1 (en) | 2022-03-31 | 2023-10-05 | Lytegate GmbH | Method and measuring arrangement for examining organic material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102022107746A1 (en) | 2022-03-31 | 2023-10-05 | Lytegate GmbH | Method and measuring arrangement for examining organic material |
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