WO2024237792A1 - Système et procédé d'étalonnage d'un capteur de mesure d'un gaz dissous dans un liquide - Google Patents

Système et procédé d'étalonnage d'un capteur de mesure d'un gaz dissous dans un liquide Download PDF

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Publication number
WO2024237792A1
WO2024237792A1 PCT/NO2024/000003 NO2024000003W WO2024237792A1 WO 2024237792 A1 WO2024237792 A1 WO 2024237792A1 NO 2024000003 W NO2024000003 W NO 2024000003W WO 2024237792 A1 WO2024237792 A1 WO 2024237792A1
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WIPO (PCT)
Prior art keywords
gas
liquid
gases
equilibrator
phase
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PCT/NO2024/000003
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English (en)
Inventor
Aga Morten
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Searas AS
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Searas AS
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Publication of WO2024237792A1 publication Critical patent/WO2024237792A1/fr
Priority to NO20251234A priority Critical patent/NO20251234A1/en
Anticipated expiration legal-status Critical
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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
    • 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
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0006—Calibrating gas analysers
    • 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
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature

Definitions

  • the present invention relates to a method and system for calibrating a sensor that measures the amount of a gas dissolved in a liquid.
  • the present invention is an improvement of existing measurement methods for measuring gas dissolved in liquid at very low concentrations.
  • the invention builds on systems and methods previously patented by the holder Searas AS, such as the solutions described in PCT applications PCT/N02020/050280 and PCT/N02022/000002, and the present invention provides an improvement of these solutions.
  • An improved calibration is introduced by changing the temperature, humidity, and pressure of the calibration gas supplied to the sensor so that it has approximately the same properties (temperature and humidity) as the liquid in which the gas measurement is to be performed.
  • Sulfate-reducing bacteria are anaerobic bacteria that form H2S. This occurs in areas of the fish tank or water treatment system where there is poor water circulation. It also occurs in the biofilter if anaerobic conditions arise. Under a heterotrophic biofilm, there will also be anaerobic conditions. Small amounts of H2S are produced here, and therefore there will always be a certain background level of H2S in all RAS systems. This level is low, often around 100 ng/liter, and is therefore difficult to measure in water. The sensors are also very susceptible to the corrosive seawater environment.
  • the present invention relates in a first aspect to a system for determining the amount of one or more gases dissolved in a liquid, such as process water, where the system comprises means for continuously supplying said liquid to an equilibrator arranged to establish equilibrium between gases in a gas phase and a liquid phase, and where a sensor device measures the amount of said gas(es) in the gas phase, characterized in that the system comprises a calibration loop where a calibration gas is introduced to the sensor device and where the system comprises means arranged to change the properties of said calibration gas such as humidity, temperature, or pressure before the calibration gas is introduced into the sensor device.
  • said means is a closed container arranged surrounded by liquid in a tank.
  • the properties of the calibration gas such as humidity, temperature, or pressure are changed to the same or approximately the same values as the gas in the gas phase.
  • gases from the gas phase in a closed gas volume are brought into contact with the liquid phase.
  • the system comprises an air pump arranged to pump calibration gas through the system to the sensor device.
  • the system comprises means arranged to change the temperature and humidity of the calibration gas.
  • said means is a closed container arranged surrounded by liquid in a tank.
  • calibration gas is supplied through a diffuser stone arranged to form small bubbles.
  • the system comprises a gas transporter arranged to cause circulation of gases from the gas phase to the liquid phase.
  • the equilibrator has an outlet with a water lock to regulate the liquid level in the equilibrator.
  • the sensor device measures the amount of gases directly in the gas phase in the equilibrator.
  • gases from the gas phase are circulated in a closed loop through the liquid phase.
  • the system comprises a gas transporter that transports gases in a closed loop from the gas phase to the liquid phase.
  • the gas transporter comprises a pump and a pipeline for transporting gases from the gas phase to the liquid phase.
  • the system comprises a closed loop and that gases from the gas phase are transported by a gas transporter to the liquid phase via this loop, and that a sensor device is arranged in the loop and measures the amount of one or more gases in the gas phase.
  • gas from the gas phase is circulated in a closed loop via a sensor device for measuring the amount of a given gas.
  • the gas supply unit is a hose equipped with an air pump to draw gas from the gas phase and supply it to the liquid phase.
  • the gas transporter is an ejector.
  • liquid is supplied via pump and pipelines to the top of the equilibrator and the ejector arranged in the liquid phase in the equilibrator, and that gases from the gas phase are drawn into the ejector via pipeline.
  • a foam suppressor is arranged in the gas phase in the equilibrator.
  • the foam suppressor is arranged in the equilibrator so that there is a gas phase above the foam suppressor.
  • gases are drawn to the sensor device from the gas phase below the foam suppressor and that gases returning from the sensor device return to the equilibrator via the gas phase above the foam suppressor.
  • liquid is supplied to the equilibrator via a nozzle, arranged to spread the water over the cross-section of the equilibrator or that the liquid is supplied and flows down along the inner surfaces of the equilibrator.
  • the gas transporter is a diffuser.
  • gases from the gas phase are pumped from the foam suppressor to the diffuser.
  • the equilibrator is arranged substantially horizontally and that gases are circulated in a closed loop through the gas phase in the equilibrator using a pump or propeller.
  • the sensor device is connected to the closed loop.
  • liquid is transferred to the equilibrator via nozzles, and supplied to the end edge of the equilibrator where it flows out through a pipeline with a water lock.
  • the measurements of the amount of gas are calibrated with measurements of a gas mixture, such as air, with a known gas composition.
  • the calibration takes place in a closed loop equipped with valves, and that the calibration is performed automatically at given times.
  • liquid supplied to the equilibrator is drawn from a first container.
  • the system comprises a container upstream of the equilibrator and downstream of the container for regulating the pH of the liquid before it is transferred to the equilibrator.
  • the container arranged to regulate the pH of the liquid comprises means for adding a pH-regulating agent to the container.
  • the pH-regulating agent can be in the form of a gas, a liquid, or a solid.
  • the present invention relates to a method for determining the amount of a gas dissolved in a liquid, characterized by continuously supplying the liquid in a closed loop to an equilibrator arranged to establish equilibrium between the gases in a gas phase and the gases dissolved in a liquid phase in the equilibrator, and where gases from the gas phase in a closed gas volume are brought into contact with the liquid phase, and a sensor device measures the amount of one or more gases in the gas phase, characterized by introducing a calibration gas to the sensor device and where the system comprises means arranged to change the properties of said calibration gas such as humidity, temperature, or pressure before the calibration gas is introduced into the sensor device.
  • the properties of the calibration gas such as humidity, temperature, or pressure are changed to the same or approximately the same values as the gas in the gas phase.
  • gases from the gas phase in a closed gas volume, are brought into contact with the liquid phase.
  • an air pump pumps calibration gas through the system to the sensor device.
  • the temperature and humidity of the calibration gas are changed before it is introduced to the sensor.
  • calibration gas is supplied through a diffuser stone arranged to form small bubbles.
  • a gas transporter causes circulation of gases from the gas phase to the liquid phase.
  • gases from the gas phase are transported by a gas transporter to the liquid phase in a closed loop, and a sensor device is arranged in the loop and measures the amount of one or more gases in the gas phase.
  • gas from the gas phase is circulated in a closed loop via a sensor device for measuring the amount of a given gas.
  • the sensor device measures the amount of one or more gases selected from hydrogen sulfide, carbon dioxide, oxygen, and ammonia.
  • the gas is hydrogen sulfide.
  • the flow rate and amount of liquid through the equilibrator are measured or calculated, so that the absolute amount of gas dissolved in the liquid can be calculated.
  • the gas transporter generates microbubbles in the liquid phase.
  • the liquid is continuously transferred from a first container to the equilibrator.
  • a system according to any of claims 1 -33 is arranged in multiple locations in a fish farm.
  • the system is arranged to measure gas amounts in liquid entering the fish tank.
  • the system is arranged to measure gas amounts released from the system via the CO2 stripper.
  • the liquid is supplied with a pH-regulating agent after leaving the container and before being transferred to the equilibrator, to adjust the pH of the liquid so that the equilibrium between the gas dissolved in the liquid and its ions dissolved in the liquid shifts, resulting in more gas being dissolved in the liquid.
  • the change in pH due to the addition of the pH-regulating agent is used to calculate the amount of gas dissolved in the liquid in the container based on measurements of the amount of said gas in the gas phase corrected for the change in the amount of gas due to the change in pH.
  • Figure 1 schematically shows a system for measuring the concentration or amount of a gas in a liquid.
  • the liquid is transferred in a continuous flow to an equilibrator, and the amount of gas is measured in the gas phase in this equilibrator.
  • Figure 2 shows the same solution as Figure 1 , but additionally includes a gas transporter for transporting gases from the gas phase in the equilibrator to the liquid phase in the equilibrator.
  • Figure 3 schematically shows a system for measuring the amount of a gas dissolved in a liquid.
  • the liquid is transferred in a continuous flow to an equilibrator via a container for adjusting the liquid's pH.
  • Figure 4 shows the same solution as in Figure 1 , but additionally includes a gas transporter for transporting gases from the gas phase in the equilibrator to the liquid phase in the equilibrator.
  • Figure 5 shows an embodiment according to the invention where a calibration loop is introduced to ensure that the calibration gas is given the same temperature and humidity as the process liquid.
  • the liquid for example, water in a fish farm
  • the equilibrator is a container where equilibrium is established between gases in the liquid phase 80b and in the gas phase 80a.
  • gases from the gas phase 80a are brought into contact with the liquid phase to achieve an efficient exchange of gases between the gas and liquid phases, so that equilibrium between gases in the gas phase and liquid phase is established more quickly.
  • this is achieved by circulating the gases passing through the sensor box in a closed loop through the water flowing through the equilibrator. This will establish an equilibrium between the water and the gas above the water surface, so that the gases in this gas phase at all times reflect the content of gases in the liquid phase.
  • the sensors therefore measure gases that are in equilibrium with the liquid and are not directly exposed to the liquid, avoiding problems such as fouling, maintenance, sensor lifespan, and accuracy.
  • Figure 1 schematically shows a general embodiment for measuring gases dissolved in a liquid 10, where the concentration or amount of a given gas dissolved in a liquid 10 in a container 11 is to be measured.
  • the container 11 can, for example, be a closed fish farming pen or the tank in a RAS system.
  • the liquid 10 is transferred in a continuous flow using a pump 62 via a pipeline 60 to an equilibrator 80.
  • the liquid is supplied to the upper part of the equilibrator, but the liquid 10 can, in principle, be supplied to any part of the equilibrator 80, including the liquid phase 80b at the bottom of the equilibrator 80.
  • the liquid is supplied so that it flows down along the inner sides of the equilibrator 80.
  • an outlet 70 is arranged to regulate the water level in the equilibrator 80.
  • the equilibrator 80 In the equilibrator 80, an equilibrium is established with respect to the amount of gases between the liquid phase 80b and the gas or air phase 80a, so that the amount of a given gas in the gas phase 80a is correlated to the amount of this gas in the liquid phase 80b. Since the liquid 10 continuously flows from the container 11 to the equilibrator 80, and since the system is closed, the content of a given gas in the gas phase 80a is correlated to the amount of this gas dissolved in the liquid 10 in the container 11. The actual gas content in the liquid 10 in the container 11 can then be calculated based on the measurement of the gas content in 80a.
  • This solution represents a completely new principle for measuring the amount or concentration of a gas in a liquid, by having the liquid flow through the equilibrator. Gases from the gas phase 80a are circulated in a closed loop that is in contact with or flows through the liquid phase 80b, establishing an equilibrium between gases in the liquid phase 80b and the gas phase 80a. The gas measurement is performed in the gas phase 80a, but reflects the amounts of gas in the liquid phase 80b. This avoids the sensors being in contact with the liquid 10.
  • This principle can be used for measuring any gas, but is particularly suitable for monitoring gases that are difficult to measure directly in the liquid.
  • the system and method according to the invention are specifically developed to measure low concentrations of H2S and NH3, but can also be used for other gases and also when the amounts of gas dissolved in the liquid are larger.
  • the sensors 200 are placed directly in the gas phase 80a. This solution is not shown in the figures. If the liquid is trickled/sprayed into the equilibrator 80, no additional means are needed to transport gas from the gas phase 80a to the liquid phase 80b. However, it is often preferable to have other means arranged in the equilibrator 80 to transfer gases from the gas phase 80a to 80b.
  • Figure 1 shows a more preferred solution for measuring the concentration and amount of gases.
  • a pipeline 200a carries the gases using a pump 202 from the gas phase 80a via a sensor device 200, and back to the equilibrator 80, preferably via the liquid phase 80b in the equilibrator 80.
  • This circuit is closed, and no gases or air are supplied from outside as the gases only circulate from the gas phase 80a to the liquid phase 80b, via the sensor device 200.
  • This circulation of gases is beneficial for establishing equilibrium between gases in the liquid phase 80b and the gas phase 80a, and the measurements of a given gas are most accurate when there is near equilibrium in the equilibrator 80.
  • sensors S1 , S2, and S3 which can, for example, be sensors for measuring H2S, CO2, and 02, which are important gases to monitor in a RAS system.
  • Figure 2 shows essentially the same solution as in Figure 1 , but includes an additional gas transporter 100 to improve the exchange of gases between the gas phase 80a and the liquid phase 80b, i.e. , so that equilibrium in the equilibrator 80 is established more quickly.
  • the gas transporter 100 in Figure 2 is a pipeline extending from the gas phase 80a to the liquid phase 80b, equipped with a pump 102 so that gas can be transported from the gas phase 80a to the liquid phase 80b.
  • the circuit is closed, and no gas is supplied to the system, only a transfer from 80a to 80b to improve the exchange of gases between the two phases.
  • this gas transporter 100 is schematically shown arranged inside the equilibrator 80, but in an alternative embodiment, it is arranged outside the equilibrator 80 with pipelines extending through the equilibrator 80 so that gases can be transferred from 80a to 80b.
  • the gases released from the gas transporter into the liquid phase 80b to be in the form of small air bubbles, preferably microbubbles. These have a large surface area relative to volume, i.e. , a relatively large interface between liquid and gas, which enables efficient gas exchange between 80a and 80b, and a rapid establishment of equilibrium in the equilibrator 80.
  • Figure 3 schematically shows such a system for adjusting the pH of a liquid before the gas amount in the liquid is measured in an equilibrator 80.
  • the goal is to measure the amount or concentration of a given gas in a liquid contained in a container 11 .
  • This can, for example, be a fish farm, such as a RAS system.
  • Conventional methods for measuring gas amounts for many types of gas are not sufficiently sensitive to measure the gas amount in the liquid in the container 11 itself. Therefore, the liquid is transferred to an equilibrator 80 via pipelines 60, using a pump 62.
  • a water lock 70 Associated with the equilibrator 80 is a water lock 70 at the outlet to regulate the liquid level in the equilibrator 80.
  • an equilibrium for the gas to be measured will be established between the amount of gas dissolved in the liquid 80b in the equilibrator 80 and the amount of gas dissolved in the gas phase 80a above the liquid level in the equilibrator 80. It is preferred that this equilibrium between gas dissolved in the liquid phase 80b and the gas phase 80a is established quickly so that the measurements of the amount of the relevant gas, measured using sensors 200 in the gas phase 80a, can be performed continuously.
  • the system is preferably equipped with means to facilitate the circulation of the gas phase 80a to the liquid phase 80b.
  • gases from the gas phase 80a are transported to the liquid phase 80b, and preferably also transported through the liquid phase 80b, the equilibrium between gases in the liquid phase 80b and the gas phase 80a will be established more quickly.
  • These means for transporting gases through the liquid phase 80b are schematically illustrated in some of the figures as a gas transporter with reference number 100.
  • the gas measured in sensor 200 is transported to a lower level in the liquid phase 80b so that bubbles of gas phase 80a rise through the liquid phase 80b.
  • any gas passed through the liquid phase 80b will facilitate a faster establishment of equilibrium between gas in the gas phase 80a and the liquid phase 80b.
  • bubble another gas such as air or oxygen
  • air or oxygen can be supplied using an injector or ejector directly to the liquid phase 80b.
  • the gas (e.g., air) supplied to the liquid phase 80b forms small bubbles, preferably microbubbles, in the liquid phase 80b.
  • Such bubbles, and preferably microbubbles establish a relatively large interface between gases in the gas phase 80a (which also includes the volume inside the bubbles) and gases in the liquid phase 80b. A larger interface accelerates the establishment of equilibrium.
  • FIG. 4 schematically shows this gas transporter 100 arranged inside the equilibrator 80, but in an alternative embodiment, it is arranged outside the equilibrator 80 with pipelines extending through the equilibrator 80 so that gases can be transferred from 80a to 80b, i.e. , gases are extracted from the gas phase 80a and supplied, preferably at a lower level, to the liquid phase 80b.
  • gases can be transferred from 80a to 80b, i.e. , gases are extracted from the gas phase 80a and supplied, preferably at a lower level, to the liquid phase 80b.
  • it is beneficial for the gases released from the gas transporter into the liquid phase 80b to be in the form of small air bubbles, preferably microbubbles.
  • microbubbles have a large surface area relative to volume, i.e. , a relatively large interface between liquid and gas, which enables efficient gas exchange between 80a and 80b, and a rapid establishment of equilibrium in the equilibrator 80.
  • sensors 300a are arranged to measure the pH in the fish tank 11 itself, so that the pH can be measured at any time before adding the pH-regulating agent. Furthermore, the pH can be measured using sensor 300b to measure the pH in the liquid phase 80b of the solution in the equilibrator 80.
  • the sensor 300b for measuring the pH after adding the pH-adjusting agent can also be arranged in the pipeline that leads the liquid 10 from the container 20 for pH adjustment to the equilibrator 80.
  • Conventional pH meters can be used, and preferably these are read automatically, and the results are sent to a control unit so that the pH of the solution before adding the pH-regulating agent and the pH after adding it can be continuously monitored.
  • the number of times the concentration of NH3 has changed after adding the pH-regulating agent can be calculated, and it can be corrected back to calculate how much NH3 was originally present in the liquid 10, i.e., before adding the pH-regulating agent.
  • the sensitivity of the measurement is increased as the equilibrium between gas dissolved in the liquid and its corresponding ions dissolved in the liquid is shifted to a pH value where the equilibrium is shifted towards the gas.
  • the pH-regulating agent can be dosed in such a way that the amount added is fully controlled.
  • the pH value after addition can be calculated, and this calculated value can be used to determine the number of times the amount of the relevant gas, such as NH3, has increased with the pH adjustment.
  • Figure 7 schematically shows a system where a container 350 for receiving the pH-regulating agent is arranged. The pipeline leading from the container 350 to the container 20 is equipped with a dosing unit 400 that controls and measures the amount of pH-regulating agent added.
  • the dosing unit 400 can preferably dose and measure the amount based on weight. Such dosing units 400 are conventional and can be purchased.
  • the system and method according to the invention are described for measuring NH3 in a fish farm, but we emphasize that other gases can also be measured, especially other gases that shift the equilibrium between gas and ions dissolved in the liquid if a pH change is imposed.
  • other gases can be measured with the system and method, i.e., without adjusting the pH, or without this affecting the amount of the mentioned gas in the liquid 10, but by simply using the effect of transferring the liquid to an equilibrator to measure the amount of gas in the gas phase 80a and not in the liquid 10 itself.
  • multiple gases can be measured simultaneously by using multiple sensors 200, each specific to at least one of the mentioned gases to be measured.
  • the invention provides an opportunity for continuous measurement of gases in liquids in a facility, such as a fish farm.
  • the two principles including (i) measuring gas levels in the gas phase when the liquid is in an equilibrator 80 and equilibrium is established between the mentioned gas in the gas phase 80a and the liquid phase 80b, and (ii) adjusting the pH of the liquid 10 to shift the equilibrium towards more dissolved gas in the liquid to indirectly measure smaller amounts of gas in the liquid, bring new opportunities for continuous control of gas concentrations in the liquid, especially gases that can have a harmful effect on species, such as fish, that are farmed in the liquid 10 in the container 11 .
  • the method and system provide an opportunity for continuous control over the development of gases in the liquid. Relative values can be easily measured, i.e., changes in the amount of a given gas can be measured, but one can also easily calculate the absolute values and determine if these are approaching a level that would be harmful to the fish, so that measures can be taken.
  • Figure 5 schematically describes the present invention, i.e. , a method and system for calibrating a sensor used for measuring one or more gases dissolved in a liquid.
  • the system and method shown in Figure 5 are an improvement over existing methods as they allow the sensor to be calibrated with a gas that has the same temperature, humidity, and pressure as the process liquid 10.
  • a sensor that measures gases in the air is often calibrated against air with known gas content or partial pressure.
  • gases in the atmosphere have known contents such as CO2 - 420 ppm, O2 - 20.95%, H2S - 0 ppm, NH3 - 0 ppm.
  • calibrating a sensor against one of the aforementioned gases it will be calibrated against the content of the relevant gas, but also in most uses of a sensor, the pressure, temperature, and RH will be the same as in the air being measured.
  • gases such as CO2 - 420 ppm, O2 - 20.95%, H2S - 0 ppm, NH3 - 0 ppm
  • the calibration loop 300 includes a pump 320 for intake of a known gas such as air.
  • a gas (air) taken in by the pump 320 is led into a humidifier and temperature adjuster 340, such as a closed container 340 arranged to be surrounded by process liquid 10, which will set the temperature in the container 340 to the same temperature as the process water 10.
  • the process water is led through tank 10, which contains a closed container 340 with distilled water.
  • the tank 10 and the closed container 340 will then achieve the same temperature as the process water.
  • the calibration air is led into the closed container 340 and rises through the water, achieving the same temperature and approximately 100% humidity before being led to the sensor elements 200 for calibration verification.
  • it is crucial that the calibration gas has the same temperature and humidity as the gas being measured.
  • a separate air calibration pump (320) is introduced, which draws air from, for example, the atmosphere and pumps it through a "humidifier and temperature adjuster" (LFTI) (340).
  • the LFTI (340) contains clean water through which the gas is pumped. At the same time, the water is surrounded by process water 10, so it achieves the same temperature as the process water 10. It is important that the temperature transfer from the process water is sufficient concerning the temperature influences from the gas being pumped through the water.
  • the air When the air is pumped down into the water in (340), it can preferably pass through a diffuser stone 360 or similar, forming small bubbles. These will more easily achieve the same temperature and humidity (RH).
  • the gas above the liquid phase in the container 340 is then led to the sensor for calibration.
  • the calibration air (310) had the same temperature and humidity as the process air (gas phase 80a from the equilibrator). Then the humidity in the sensor housing changed very little (80.1 % to 80.3%). This means that when we calibrate, we find the zero point for NH3 (based on the fact that outdoor air does not contain NH3) with the same influence of temperature and humidity from both process air and calibration air.

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Abstract

L'invention concerne un système et un procédé pour déterminer la quantité d'un ou plusieurs gaz dissous dans un liquide, tel que de l'eau de traitement, le système comprenant des moyens pour fournir en continu ledit liquide à un système d'équilibrage conçu pour établir un équilibre entre des gaz dans une phase gazeuse et dans une phase liquide, et un dispositif de capteur mesurant la quantité dudit ou desdits gaz dans la phase gazeuse, le système et le procédé comprenant une boucle d'étalonnage pour étalonner le capteur.
PCT/NO2024/000003 2023-05-15 2024-05-14 Système et procédé d'étalonnage d'un capteur de mesure d'un gaz dissous dans un liquide Ceased WO2024237792A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO20251234A NO20251234A1 (en) 2023-05-15 2025-10-15 System and method for calibrating a sensor for measuring a gas dissolved in a liquid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20230572 2023-05-15
NO20230572A NO349329B1 (no) 2023-05-15 2023-05-15 System og fremgangsmåte for å kalibrere en sensor for måling av en gass oppløst i en væske

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WO2024237792A1 true WO2024237792A1 (fr) 2024-11-21

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PCT/NO2024/000003 Ceased WO2024237792A1 (fr) 2023-05-15 2024-05-14 Système et procédé d'étalonnage d'un capteur de mesure d'un gaz dissous dans un liquide

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756069A (en) * 1971-08-04 1973-09-04 Gow Mac Instrument Co Gas analyzer apparatus
EP1697739A1 (fr) * 2003-12-22 2006-09-06 LAR Analytik und Umweltmesstechnik GmbH Procede et systeme pour determiner des substances contenues dans l'eau
CN211348203U (zh) * 2019-12-24 2020-08-25 自然资源部第二海洋研究所 一种海水二氧化碳传感器高精度高效校准装置
CN113777262A (zh) * 2021-09-24 2021-12-10 同济大学 一种基于恒温控制的海水甲烷传感器校准装置及校准方法
NO20210604A1 (no) * 2021-05-12 2022-11-14 Searas As System og fremgangsmåte for å måle mengde av en gass oppløst i en væske

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756069A (en) * 1971-08-04 1973-09-04 Gow Mac Instrument Co Gas analyzer apparatus
EP1697739A1 (fr) * 2003-12-22 2006-09-06 LAR Analytik und Umweltmesstechnik GmbH Procede et systeme pour determiner des substances contenues dans l'eau
CN211348203U (zh) * 2019-12-24 2020-08-25 自然资源部第二海洋研究所 一种海水二氧化碳传感器高精度高效校准装置
NO20210604A1 (no) * 2021-05-12 2022-11-14 Searas As System og fremgangsmåte for å måle mengde av en gass oppløst i en væske
CN113777262A (zh) * 2021-09-24 2021-12-10 同济大学 一种基于恒温控制的海水甲烷传感器校准装置及校准方法

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