CN214252247U - Device for detecting ammonia nitrogen concentration in liquid - Google Patents
Device for detecting ammonia nitrogen concentration in liquid Download PDFInfo
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- CN214252247U CN214252247U CN202022516429.XU CN202022516429U CN214252247U CN 214252247 U CN214252247 U CN 214252247U CN 202022516429 U CN202022516429 U CN 202022516429U CN 214252247 U CN214252247 U CN 214252247U
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Abstract
The utility model discloses an ammonia nitrogen concentration detection device in liquid is equipped with the flourishing liquid cavity of advance appearance pipe and reagent pipe, and the time measuring utilizes advance appearance pipe earlier to let in to flourishing liquid cavity and awaits measuring liquid, recycles reagent pipe and lets in sodium hydroxide reagent liquid to flourishing liquid cavity, and the pH value that reagent liquid will await measuring liquid adjusts to 11, makes the ammonium ion that awaits measuring in the liquid turn into free ammonia. The gas collecting cavity is independently arranged in the liquid containing cavity, the liquid containing cavity is separated from the gas collecting cavity by the waterproof breathable film, part of free ammonia in the liquid containing cavity is collected into the gas collecting cavity through the waterproof breathable film, the ammonia concentration detection piece detects the concentration of the free ammonia in the gas collecting cavity, when the free ammonia in the liquid containing cavity and the gas collecting cavity reaches dynamic balance, the ammonia concentration detection piece feeds back a concentration signal to the controller, the controller calculates the ammonia nitrogen concentration of the liquid to be detected according to the concentration signal, the ammonia nitrogen concentration of the liquid to be detected is automatically acquired, the operation is more convenient, the detection result is more accurate, the detection precision and the operation convenience are improved.
Description
Technical Field
The utility model relates to an ammonia nitrogen concentration detects technical field, in particular to ammonia nitrogen concentration detection device in liquid.
Background
In the field of aquaculture, the ammonia nitrogen in the culture pond is mainly free ammonia (NH)3) And with ammonium ion (NH)4+) The ammonia nitrogen concentration in the culture pond increases along with the increase of sediments such as excrement, and when the ammonia nitrogen concentration is higher, the life of aquatic organisms such as fishes is threatened, and underground water is polluted, so that the detection of the ammonia nitrogen concentration is particularly necessary.
The existing common ammonia nitrogen concentration detection methods mainly comprise a spectrophotometric method, a Kjeldahl method and an ammonia gas-sensitive electrode method, wherein although the spectrophotometric method has higher sensitivity, chemical reagents in the method are easy to cause secondary pollution to ammonia nitrogen sample liquid, and the accuracy of a detection result is influenced. The equipment structure related to the Kjeldahl method and the ammonia gas-sensitive electrode method is usually complex and inconvenient to operate.
Therefore, improving the detection accuracy and the operation convenience is a technical problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the utility model is to provide an ammonia nitrogen concentration detection device in liquid, utilize reagent liquid to adjust the pH value of the liquid that awaits measuring of liquid intracavity to 11 so that the ammonium ion in the liquid that awaits measuring turns into free ammonia under predetermineeing the temperature, free ammonia passes water proof ventilated membrane and collects to the gas collection intracavity, the controller is according to the ammonia concentration that the signal count that the ammonia concentration detection piece feedback that the gas collection intracavity was established was measured the ammonia nitrogen concentration of liquid, the operation is more convenient and the testing result is more accurate, it obtains promoting to detect precision and simple operation nature.
The specific scheme is as follows:
the utility model provides an ammonia nitrogen concentration detection device in liquid, includes:
the reagent liquid flowing out of the reagent tube is used for adjusting the pH value of the liquid to be detected flowing out of the sample tube to 11 at a preset temperature so as to convert ammonium ions in the liquid to be detected into free ammonia gas;
the gas collecting cavity is independently arranged in the liquid containing cavity, and the liquid containing cavity and the gas collecting cavity are separated by a water-proof gas-permeable film so that free ammonia gas in the liquid containing cavity is collected into the gas collecting cavity through the water-proof gas-permeable film;
the ammonia concentration detection part is used for detecting the concentration of free ammonia in the gas collection cavity;
and the controller is used for calculating the ammonia nitrogen concentration of the liquid to be detected when the free ammonia gas in the liquid containing cavity and the gas collecting cavity reaches dynamic balance according to the concentration information fed back by the ammonia concentration detection piece.
Preferably, the device further comprises a display screen connected with the controller, and the controller is used for controlling the display screen to display the ammonia nitrogen concentration of the liquid to be detected in real time.
Preferably, the sampling pipe is provided with a liquid inlet valve and further comprises a liquid level detection part for detecting the liquid level of the liquid to be detected in the liquid containing cavity, the liquid inlet valve and the liquid level detection part are both connected with the controller, and the controller is used for controlling the liquid inlet valve to be closed when the liquid level of the liquid to be detected in the liquid containing cavity reaches a preset height according to a signal sent by the liquid level detection part.
Preferably, the reagent pipe is provided with a reagent valve, and further comprises a pH value detection part for detecting the pH value of the mixed liquid in the liquid containing cavity after the liquid to be detected is mixed with the reagent liquid, the reagent valve and the pH value detection part are both connected with the controller, and the controller is used for controlling the reagent valve to be closed when the pH value of the mixed liquid reaches 11 according to a signal fed back by the pH value detection part.
Preferably, still including the casing that has flourishing liquid chamber and locate the casing periphery and be used for adjusting the temperature regulator of flourishing liquid intracavity mixed liquid temperature and be used for detecting the temperature detection piece of flourishing liquid intracavity mixed liquid temperature, the temperature regulator all links to each other with the controller with temperature detection piece, the controller is used for starting the temperature regulator according to the signal that temperature detection piece feedback and in the temperature of mixed liquid and predetermine the temperature inconsistent start the temperature regulator and heat or refrigerate mixed liquid correspondingly until the temperature of mixed liquid and predetermine the temperature unanimity
Preferably, the waterproof breathable film further comprises a protective sleeve sleeved on the periphery of the waterproof breathable film, and the protective sleeve is provided with a vent hole.
Preferably, a drying layer is arranged in the waterproof breathable film.
Preferably, the bottom of the shell is provided with a drain pipe, and the drain pipe is provided with a drain valve.
Preferably, the drain pipe is provided with a drain pump.
Preferably, the shell is a transparent shell, and the transparent shell is provided with scale marks for indicating the height of the liquid level.
For background art, the utility model provides an ammonia nitrogen concentration detection device in liquid is including flourishing sap cavity, gas collecting cavity, ammonia concentration detection spare and controller, flourishing sap cavity is equipped with into appearance pipe and reagent pipe, utilize into appearance pipe earlier during the detection and let in a certain amount to wait to detect the liquid to flourishing sap cavity, recycle reagent pipe and let in sodium hydroxide reagent liquid to flourishing sap cavity, reagent liquid mixes with waiting to detect the liquid under the temperature of predetermineeing, reagent liquid will wait to detect the pH value of liquid and adjust to 11, make the ammonium ion in waiting to detect the liquid turn into free ammonia. The flourishing liquid intracavity is independently located to the gas collecting chamber, flourishing liquid chamber is separated by the water proof ventilated membrane with the gas collecting chamber, the part free ammonia in flourishing liquid intracavity collects to the gas collecting intracavity through the water proof ventilated membrane, ammonia concentration detection piece detects the concentration of the free ammonia in the gas collecting chamber, when the free ammonia in flourishing liquid chamber and gas collecting chamber reaches dynamic balance, ammonia concentration detection piece feedback concentration signal to controller, the controller calculates the ammonia nitrogen concentration of waiting to survey the liquid according to this, from this the automatic acquisition waits to survey the ammonia nitrogen concentration of liquid, the operation is more convenient and the testing result is more accurate, consequently the utility model provides an in the liquid ammonia nitrogen concentration detection device's detection precision and convenient operation all obtain promoting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of a device for detecting ammonia nitrogen concentration in liquid according to an embodiment of the present invention.
The reference numbers are as follows:
the device comprises a shell 1, a liquid containing cavity 2, a sample inlet pipe 3, a reagent pipe 4, a gas collecting cavity 5, a water-proof and gas-permeable film 6, an ammonia gas concentration detection piece 7, a controller 8, a display screen 9, a pH value detection piece 10, a temperature detection piece 11, a protective sleeve 12, a drying layer 13, a drain pipe 14 and a liquid discharge pump 15;
a sample injection piston 31;
a reagent piston 41;
a vent 121.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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 order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a device for detecting ammonia nitrogen concentration in liquid according to an embodiment of the present invention.
The embodiment of the utility model discloses ammonia nitrogen concentration detection device in liquid, including flourishing sap cavity 2, gas collecting cavity 5, ammonia concentration detection spare 7 and controller 8, flourishing sap cavity 2 is used for holding liquid and reagent liquid waiting to be surveyed. The housing 1 has a liquid receiving chamber 2. In order to conveniently observe the height of the liquid level in the liquid containing cavity 2, the shell 1 can be a transparent shell, and scale marks for indicating the height of the liquid level are arranged on the outer side surface of the transparent shell. The transparent shell can be made of glass or plastic materials, but no matter what materials are used, the transparent shell is ensured to have good acid and alkali resistance.
In order to facilitate drainage, the bottom of the casing 1 is provided with a drain pipe 14, and the drain pipe 14 is provided with a drain valve. After the detection is finished, the drain valve is opened, and the mixed liquid in the liquid containing cavity 2 is discharged from the drain pipe 14. Furthermore, drain pipe 14 is equipped with positive displacement pump 15, and during the flowing back, starts positive displacement pump 15, and positive displacement pump 15 pumps the mixed liquid in flourishing liquid chamber 2, conveniently flourishing liquid chamber 2 drains clean mixed liquid, avoids influencing next detection precision.
The liquid containing cavity 2 is provided with a sample inlet pipe 3 and a reagent pipe 4, when in detection, a certain amount of liquid to be detected is firstly introduced into the liquid containing cavity 2 by the sample inlet pipe 3, and when the liquid to be detected reaches a certain volume, the introduction of the liquid to be detected is stopped; and then, introducing 1mol/L sodium hydroxide reagent solution into the solution containing cavity 2 by using the reagent tube 4, mixing the reagent solution and the solution to be detected at a preset temperature, adjusting the pH value of the solution to be detected to 11 by using the reagent solution, and stopping introducing the reagent solution to convert ammonium ions in the solution to be detected into free ammonia gas. The sampling tube 3 and the reagent tube 4 can be plastic tubes.
In addition, a sample injection piston 31 is arranged in the sample injection pipe 3, and the sample injection piston 31 is used for controlling the liquid inlet amount and the sample injection speed of the sample injection pipe 3. Similarly, a reagent piston 41 is provided in the reagent tube 4, and the reagent piston 41 controls the amount of the reagent in the reagent tube 4 and the reagent addition rate.
It should be noted that the predetermined temperature is an optimum temperature for maximum conversion of ammonium ions in the solution to be measured into free ammonia gas, and is related to the components of the solution to be measured, and is not limited herein.
The gas collecting cavity 5 is independently arranged in the liquid containing cavity 2, the liquid containing cavity 2 and the gas collecting cavity 5 are separated by a water-proof breathable film 6, and part of free ammonia gas in the liquid containing cavity 2 is collected into the gas collecting cavity 5 through the water-proof breathable film 6, so that the gas collecting cavity 5 can contain a certain volume of free ammonia gas. The waterproof breathable film 6 can be made of polytetrafluoroethylene, polyethylene or polypropylene, so that the waterproof breathable film 6 has good acid and alkali resistance.
For the life of extension water proof ventilated membrane 6, the utility model discloses still including the lag 12 of cover in the 6 peripheries of water proof ventilated membrane, lag 12 is equipped with air vent 121, and free ammonia pierces through water proof ventilated membrane 6 through air vent 121. The protecting jacket 12 can prevent the water-proof and breathable film 6 from deforming, and can isolate the gas collecting cavity 5 in the liquid containing cavity 2. The protective sleeve 12 is a plastic sleeve, and has good acid and alkali resistance.
Be equipped with dry layer 13 in the water proof ventilated membrane 6, dry layer 13 is used for absorbing the moisture in the gas collection chamber 5, guarantees that the free ammonia volume in the gas collection chamber 5 reaches the biggest, makes things convenient for ammonia concentration detection spare 7 accurate detection gas collection chamber 5 in the concentration of free ammonia. The drying layer 13 comprises one or more of silica gel drying agent or calcium chloride drying agent.
The ammonia concentration detection piece 7 detects the concentration of free ammonia in the gas collection chamber 5, and the ammonia concentration detection piece 7 is specifically a semiconductor ammonia concentration sensor, but the type is not limited thereto.
The ammonia concentration detection piece 7 is connected with the controller 8, under the condition of preset temperature, when the free ammonia in the liquid containing cavity 2 and the gas collecting cavity 5 reaches dynamic balance, the ammonia concentration detection piece 7 feeds back a concentration signal to the controller 8, and the controller 8 calculates the ammonia nitrogen concentration of the liquid to be detected according to the stored ammonia concentration calculation formula, so that the ammonia nitrogen concentration of the liquid to be detected is automatically obtained, the operation is more convenient, and the detection result is more accurate.
In this embodiment, casing 1 is equipped with the holding tank that is used for holding controller 8, and the holding tank integral type is located on casing 1, avoids the liquid in flourishing liquid chamber 2 to influence controller 8. The controller 8 comprises a central processing module for processing signals and an analog circuit board for amplifying current signals, and an external power line passes through the top cover of the shell 1 and is connected with the analog circuit board.
To sum up, the utility model provides an ammonia nitrogen concentration detection device's detection precision and simple operation nature all obtain promoting in the liquid.
For making things convenient for the measurement personnel audio-visual ammonia nitrogen concentration who acquires the liquid that awaits measuring, the utility model discloses still include the display screen 9 that links to each other with controller 8, controller 8 will wait that the ammonia nitrogen concentration of liquid sends to display screen 9, controls display screen 9 and shows in real time that the ammonia nitrogen concentration of waiting to measure the liquid. The display screen 9 is fixedly arranged on the top cover of the shell 1, and the display screen 9 is connected with the analog circuit board through a power line.
The reagent pipe 4 is provided with a liquid inlet valve which is specifically an electromagnetic valve. The utility model discloses still include the liquid level detection piece, the liquid level detection piece is used for detecting 2 interior liquid level heights of waiting to detect of flourishing liquid chamber, and the liquid level detection piece specifically can be level sensor. The liquid inlet valve and the liquid level detection part are both connected with the controller 8. When the liquid level detection piece detects that the liquid level of the liquid to be detected in the liquid containing cavity 2 reaches the preset height, the liquid level detection piece sends a signal to the controller 8, the controller 8 controls the liquid inlet valve to be closed, the liquid inlet pipe automatically stops leading in the liquid to be detected, the automation degree is high, the volume of the liquid to be detected in the liquid containing cavity 2 can be accurately controlled, and adjustment is provided for obtaining an accurate detection result. The preset height refers to the maximum liquid level height of the liquid to be measured in the liquid containing cavity 2, and can be input into the controller 8 in advance according to the volume of the liquid containing cavity 2.
Further, the reagent tube 4 is provided with a reagent valve, which is specifically an electromagnetic valve. Correspondingly, the utility model discloses still include pH value detection piece 10, pH value detection piece 10 is used for detecting the pH value of flourishing liquid cavity 2 internal mixing liquid after waiting to detect liquid and reagent liquid mixture, and pH value detection piece 10 specifically is pH value sensor. Reagent valve and pH value detection piece 10 all link to each other with controller 8, and when pH value detection piece 10 detected the pH value of mixed liquid and reached 11, pH value detection piece 10 feedback signal to controller 8, controller 8 control reagent valve closed, and reagent pipe 4 automatic stop lets in reagent liquid, and degree of automation further improves to some extent, can accurately guarantee that the pH value of mixed liquid reaches 11, is favorable to further promoting detection accuracy.
Furthermore, the utility model discloses still include the thermoregulator and the temperature detection spare 11 that link to each other with controller 8 respectively, the thermoregulator sets firmly in casing 1 periphery for adjust the temperature of flourishing liquid cavity 2 interior mixing liquid. When the temperature of the mixed liquid is higher than the preset temperature, the temperature regulator refrigerates the liquid containing cavity 2, and reduces the temperature of the mixed liquid in the liquid containing cavity 2 until the temperature of the mixed liquid reaches the preset temperature. When the temperature of the mixed liquid is lower than the preset temperature, the temperature regulator heats the liquid containing cavity 2, and the temperature of the mixed liquid in the liquid containing cavity 2 is increased until the temperature of the mixed liquid reaches the preset temperature. When the temperature of the mixed liquid is equal to the preset temperature, the temperature regulator does not work.
The temperature detecting element 11 is used for detecting the temperature of the mixed liquid in the liquid containing cavity 2, and can be a temperature sensor.
The controller 8 judges whether the temperature of the mixed liquid is consistent with the preset temperature or not according to the temperature signal fed back by the temperature detection piece 11, and if so, the temperature regulator is controlled not to work; if not, the controller 8 starts the temperature regulator to heat or refrigerate, correspondingly increases or decreases the temperature of the mixed liquid until the temperature of the mixed liquid is consistent with the preset temperature, so that the temperature of the mixed liquid in the liquid containing cavity 2 is automatically adjusted, the temperature of the mixed liquid in the liquid containing cavity 2 is kept constant, ammonium ions in the liquid to be detected are converted into free ammonia gas to the maximum extent, and the detection result is more accurate.
The utility model provides an ammonia nitrogen concentration detection device's theory of operation in liquid as follows:
firstly, a certain amount of liquid to be detected is introduced into the liquid containing cavity 2 by using the sample inlet pipe 3, and when the volume of the liquid to be detected reaches a certain volume, the introduction of the liquid to be detected is stopped;
then, 1mol/L of sodium hydroxide reagent solution is introduced into the solution containing cavity 2 by using the reagent tube 4, the reagent solution and the solution to be detected are mixed at a preset temperature, the pH value of the solution to be detected is adjusted to 11 by the reagent solution, the introduction of the reagent solution is stopped, ammonium ions in the solution to be detected are converted into free ammonia gas, and part of the free ammonia gas in the solution to be detected passes through the waterproof breathable film 6 from the vent hole 121, is dried by the drying layer 13 and then is collected into the gas collecting cavity 5;
under the condition of preset temperature, when the free ammonia in the liquid containing cavity 2 and the gas collecting cavity 5 reaches dynamic balance, the ammonia concentration detection part 7 in the gas collecting cavity 5 feeds back a concentration signal to the controller 8, the controller 8 calculates the ammonia nitrogen concentration of the liquid to be detected, and controls the display screen 9 to display the ammonia nitrogen concentration of the liquid to be detected;
the liquid discharge pump 15 is started, the liquid discharge pump 15 sucks the mixed liquid in the liquid containing chamber 2, and the mixed liquid is discharged from the water discharge pipe 14.
The above has described the device for detecting the concentration of ammonia nitrogen in liquid provided by the present invention in detail, and the specific examples are applied herein to explain the principle and the implementation of the present invention, and the description of the above examples is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The utility model provides an ammonia nitrogen concentration detection device in liquid which characterized in that includes:
the liquid containing cavity (2) is provided with a sample inlet pipe (3) and a reagent pipe (4), and the reagent liquid flowing out of the reagent pipe (4) is used for adjusting the pH value of the liquid to be detected flowing out of the sample inlet pipe (3) to 11 at a preset temperature so as to convert ammonium ions in the liquid to be detected into free ammonia gas;
the gas collecting cavity (5) is independently arranged in the liquid containing cavity (2), and the liquid containing cavity (2) is separated from the gas collecting cavity (5) by a water-proof gas-permeable membrane (6) so that free ammonia gas in the liquid containing cavity (2) is collected into the gas collecting cavity (5) through the water-proof gas-permeable membrane (6);
an ammonia concentration detection piece (7) for detecting the concentration of free ammonia in the gas collection cavity (5);
and the controller (8) is connected with the ammonia concentration detection piece (7), and the controller (8) is used for calculating the ammonia nitrogen concentration of the liquid to be detected when the free ammonia in the liquid containing cavity (2) and the gas collecting cavity (5) reaches dynamic balance according to the concentration information fed back by the ammonia concentration detection piece (7).
2. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 1, further comprising a display screen (9) connected with the controller (8), wherein the controller (8) is used for controlling the display screen (9) to display the concentration of ammonia nitrogen in the liquid to be detected in real time.
3. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 1, wherein the sampling pipe (3) is provided with a liquid inlet valve, and further comprises a liquid level detection part for detecting the liquid level of the liquid to be detected in the liquid containing cavity (2), the liquid inlet valve and the liquid level detection part are both connected with the controller (8), and the controller (8) is used for controlling the liquid inlet valve to be closed when the liquid level of the liquid to be detected in the liquid containing cavity (2) reaches a preset height according to a signal sent by the liquid level detection part.
4. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, wherein the reagent pipe (4) is provided with a reagent valve, and further comprises a pH value detection part (10) for detecting the pH value of the mixed liquid in the liquid containing cavity (2) after the liquid to be detected and the reagent liquid are mixed, the reagent valve and the pH value detection part (10) are both connected with the controller (8), and the controller (8) is used for controlling the reagent valve to be closed when the pH value of the mixed liquid reaches 11 according to a signal fed back by the pH value detection part (10).
5. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, further comprising a housing (1) having the liquid containing cavity (2), a temperature regulator disposed on the periphery of the housing (1) and used for regulating the temperature of the mixed liquid in the liquid containing cavity (2), and a temperature detecting member (11) used for detecting the temperature of the mixed liquid in the liquid containing cavity (2), wherein the temperature regulator and the temperature detecting member (11) are both connected to the controller (8), and the controller (8) is used for starting the temperature regulator to correspondingly heat or refrigerate the mixed liquid until the temperature of the mixed liquid is consistent with the preset temperature according to a signal fed back by the temperature detecting member (11) when the temperature of the mixed liquid is inconsistent with the preset temperature.
6. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, further comprising a protective cover (12) covering the periphery of the water-proof and air-permeable membrane (6), wherein the protective cover (12) is provided with a vent hole (121).
7. The device for detecting the concentration of ammonia nitrogen in liquid according to any one of claims 1 to 3, wherein a drying layer (13) is arranged in the water-proof and breathable film (6).
8. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 5, wherein a drain pipe (14) is arranged at the bottom of the shell (1), and the drain pipe (14) is provided with a drain valve.
9. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 8, wherein the drain pipe (14) is provided with a drain pump (15).
10. The device for detecting the concentration of ammonia nitrogen in liquid according to claim 5, wherein the shell (1) is a transparent shell, and the transparent shell is provided with scale marks for indicating the height of the liquid level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022516429.XU CN214252247U (en) | 2020-11-04 | 2020-11-04 | Device for detecting ammonia nitrogen concentration in liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022516429.XU CN214252247U (en) | 2020-11-04 | 2020-11-04 | Device for detecting ammonia nitrogen concentration in liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214252247U true CN214252247U (en) | 2021-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022516429.XU Active CN214252247U (en) | 2020-11-04 | 2020-11-04 | Device for detecting ammonia nitrogen concentration in liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214252247U (en) |
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- 2020-11-04 CN CN202022516429.XU patent/CN214252247U/en active Active
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