284 results about "Carbon dioxide sensor" patented technology

The invention belongs to the field of atmospheric environment monitoring, and particularly relates to a portable multi-point soil CO2 continuous monitoring and data remote transmission system. According to the portable multi-point soil CO2 continuous monitoring and data remote transmission system, the closed air chamber-non-dispersive infrared method is adopted for measuring the soil CO2 concentration, the SenseAir carbon dioxide sensor is connected with the portable soil breathing air chamber, remote and anti-interference wireless data transmission is achieved through the LoRa technology, and the system is simple in structure, convenient to use and high in practicability. The portable multi-point soil CO2 continuous monitoring and data remote transmission system is manufactured. Therefore, automation of multi-point continuous monitoring of soil CO2 in a large-scale range is realized, the dynamic change process of soil respiration is accurately mastered, and a scientific basis is provided for making carbon sequestration and emission reduction measures.

The embodiment of the invention discloses a water-gas interface greenhouse gas flux automatic monitoring system and a distribution prediction method. The system comprises a wind speed sensor and an air pressure and temperature sensor which are respectively used for collecting the wind speed of air at a monitoring point, the atmospheric pressure and the Kelvin air temperature; the infrared sensor is used for collecting the content of CO2, CH4 and N2O in the air of the monitoring point; the acidity sensor and the temperature sensor are respectively used for collecting the pH value and the centigrade water temperature of monitoring point water; the carbon dioxide sensor is used for collecting the concentration of bicarbonate in water at a monitoring point; the methane sensor and the nitrous oxide sensor are respectively used for collecting the contents of greenhouse gases CH4 and N2O dissolved in the monitoring point water; and the calculation module is used for calculating the flux of the greenhouse gas on the water-gas interface. According to the embodiment of the invention, the water-gas interface flux of various greenhouse gases under actual conditions can be accurately monitored.

The invention discloses a carbon dioxide sensitive material and a carbon dioxide sensor, the carbon dioxide sensitive material is formed by compounding Co-Ni LDH and PEI, and the mass ratio of Co-Ni LDH to PEI is (0.2-20): 1; the invention also provides a carbon dioxide sensor prepared from the sensitive material, the carbon dioxide sensor can realize high-sensitivity detection on 15-900ppm carbon dioxide under the environment of room temperature and 50-70% RH humidity, the response value on 15ppm carbon dioxide can reach 25%, the response value on 500ppm CO2 can reach 377.8%, the response value on 900ppm carbon dioxide can reach 713%, and the response value on 15ppm CO2 can reach 377.8%. The problems that an existing carbon dioxide sensor is high in working temperature and low in detection sensitivity are solved, the testing environment range is widened, and high-sensitivity detection of carbon dioxide can be achieved in the environment with the RH of 50%-70%.

A soil carbon measurement device (100) can include a subsurface support (110) configured to be inserted at least partially under a soil surface. The subsurface support can include an interior volume (114) and a. gas-permeable barrier separating the interior volume (114) from soil under the soil surface. The device (100) can also include an ultraviolet light source (1.30) positioned to expose the soil under the soil surface to ultraviolet light, and a carbon dioxide sensor (150) configured to measure a concentration of carbon dioxide in the interior volume (114) of the subsurface support (110).

The invention discloses a livestock and poultry health state intelligent evaluation method based on multi-sensor fusion and an AI prediction model, and belongs to the technical field of livestock breeding, and the method comprises the following steps: setting multiple types of sensors in a livestock and poultry breeding area, collecting multi-source data such as temperature, humidity, carbon dioxide concentration, ammonia gas concentration, illumination intensity, weight and current, and carrying out the analysis of the data; wherein the weight data is obtained through the weighing platform, and the current data is used for sensing the operation state of drinking, ingestion, ventilation or lighting equipment; various types of sensors such as temperature and humidity sensors, carbon dioxide sensors, ammonia gas sensors, illumination sensors, weight sensors and current sensors are deployed in livestock and poultry breeding areas, all-directional data acquisition of environments and behavior states is realized, and dynamic modeling and feature extraction of key behavior nodes are realized by introducing a deep neural network structure of a gating circulation unit and an attention mechanism.

The embodiment of the invention provides a continuous blood oxygen monitoring system in extracorporeal circulation and a control method thereof. The continuous blood oxygen monitoring system comprises a vein sensor, an artery sensor, a blood flow sensor, an oxygen sensor, a carbon dioxide sensor, a controller and a display, the vein sensor monitors the vein blood oxygen saturation degree; the artery sensor monitors arterial oxygen saturation and hematocrit; the blood flow sensor monitors the blood flow of the artery pipeline; the oxygen sensor monitors the oxygen concentration of the oxygenator; the carbon dioxide sensor monitors the carbon dioxide concentration of the oxygenator; the display provides an interaction control, responds to a trigger operation acting on the interaction control, sends an interaction instruction to the controller, and updates information displayed in an interaction interface according to the control of the controller; the controller receives the interaction instruction and executes processing corresponding to the interaction instruction; the processing includes controlling display information of the display; the display information comprises information corresponding to the monitoring parameters. The scheme ensures the safety and effectiveness of the treatment process.

A system may include a flow valve coupled to a gas inlet of a landfill gas system and a pump coupled to the flow valve and configured to draw gas from the landfill gas system via the gas inlet. The system may further include an oxygen sensor comprising at least one laser configured to detect oxygen concentration in the gas, a carbon dioxide sensor comprising at least one infrared light source configured to detect carbon dioxide concentration in the gas, and / or one or more chemical sensors configured to sense concentrations of a respective one or more chemicals in the gas. A microprocessor may determine sensed data including at least the oxygen concentration, the carbon dioxide concentration, concentrations of the one or more chemicals, the static pressure, the atmospheric pressure, and / or a differential pressure, and communicate the sensed data to a mobile control device.

The invention belongs to the technical field of expiration detection, and particularly relates to an intelligent expiration tail end gas sampling device and method. The device specifically comprises a shell, a circuit board, a carbon dioxide sensor, a pressure sensor, a baffle, a top cover, a suspension plate, an air pump, a relay, a breathing mask, a mask connector with an internal small cavity, a thermal desorption tube, a TD tube, a Bluetooth module, an air path channel, a silicone tube and the like. End-expiratory gas collection is achieved through accurate triggering and flow control, and dead space gas mixing is avoided; collected gas is directly enriched into a thermal desorption (TD) adsorption tube, so that the loss of VOCs in the transmission and storage process is reduced; and through quantitative sampling volume control and an optimized pipeline material / structure, the adsorption / release and background pollution of the device body to the sample are reduced, so that the representativeness and sensitivity of sampling and the repeatability among different operators / different places are improved.

The invention provides a carbon emission metering and analyzing device, which relates to the technical field of carbon emission metering and comprises a carbon emission detector, a carbon dioxide sensor and a diaphragm air pump. The blocking degree of the first filter screen is detected through the reversing locking mechanism, when the first filter screen is blocked, the diaphragm air pump is difficult to extract air from the first conical opening, the air pressure in the first conical opening is reduced, a limiting piston in the reversing locking mechanism compresses a reset spring to move, and a triangular wedge is separated from a first triangular groove; the driving motor drives the reversing rotating disc to rotate, so that the positions of the first filter screen and the second filter screen are changed, manual intervention on the replacement operation of the filter screens is not needed, the blocked first filter screen is changed to the position below the second conical opening, and the second conical opening is formed in the air outlet end, so that the blocked first filter screen is subjected to reverse blowing cleaning by airflow; and when the second filter screen is blocked, the second filter screen can be automatically replaced, so that the automatic cleaning of the filter screens is realized, and the workload and the cost are reduced.

The invention relates to a medical device for evaluating physiological parameters of a respiratory system, and the device comprises a sampling device which is used for collecting detected exhaled gas after a rising inflection point of carbon dioxide; the gas sensor comprises a nitric oxide sensor and a carbon dioxide sensor; the processor is used for receiving the gas signal generated by the gas sensor; the processor is configured to establish a linear expression for calculating a risk parameter R according to the detected carbon dioxide concentration and nitric oxide concentration; the linear expression of the risk parameter R is shown in the specification; wherein the parameter is set as a constant; the parameter is nitric oxide concentration; the parameter is carbon dioxide concentration; and the parameter is a nitric oxide dynamic change rate function. Compared with the prior art, the method provided by the invention provides a more comprehensive evaluation capability for airway inflammation and abnormal ventilation.

The utility model relates to the technical field of dam spreading pig breeding, and discloses a pig house comprehensive environment automatic measuring device, which comprises a hanger rail and a breeding inspection machine, and the breeding inspection machine comprises a conveyor running on the hanger rail and an inspection box; an inspection camera, a programmable logic controller, an image analysis module, a sound recognition module, an environment sensing module, a communication module and a power supply module are mounted on the inspection box; the environment sensing module comprises a temperature and humidity sensor, an ammonia gas sensor and a carbon dioxide sensor; the environment parameters, such as temperature, humidity, ammonia gas and carbon dioxide concentration, of the pig house are monitored in real time through the sensors and automatically adjusted according to needs so as to maintain the optimal breeding environment, the breeding environment is optimized, healthy growth of pigs is promoted, diseases are reduced, the breeding quality is improved, an automatic system reduces dependence on manual inspection and management, and the breeding efficiency is improved. And the labor cost is reduced.

The utility model discloses a carbonization detection box for concrete durability detection, which comprises a detection box main body, and a carbonization mechanism is mounted in the detection box main body; the detection box main body comprises a box body; the carbonization mechanism comprises a carbonization box located in an inner cavity of the box body, one end of the carbonization box is in threaded connection with a sealing cover, the surface of the carbonization box is communicated with a first electromagnetic valve and a second electromagnetic valve, the gas inlet end of the second electromagnetic valve is communicated with a manual flow regulating valve, and the gas inlet end of the manual flow regulating valve is communicated with a carbon dioxide gas cylinder. A carbon dioxide sensor is fixedly mounted on the surface of the carbonization box. The carbonation detection box has the advantage of controlling the concentration of carbon dioxide, and solves the problems that the concentration of carbon dioxide in the carbonation detection box is inconvenient to control and the durability change of a concrete test piece under different concentrations of carbon dioxide is difficult to reflect in the use process of the existing carbonation detection box for concrete durability detection.

The invention belongs to the technical field of granary access control, and particularly relates to an intelligent granary access control system which comprises an environment sensing module, an identity recognition module, a processing control module and an execution and feedback module. The environment sensing module is used for collecting environment parameter data at the entrance of the granary in real time and comprises a phosphine sensor, an oxygen sensor and a carbon dioxide sensor; according to the invention, by fusing the technical characteristics of the hydrogen phosphide sensor, the oxygen sensor and the carbon dioxide sensor, the environmental safety is comprehensively evaluated, and compared with the dependence of a single sensor, the accuracy and reliability of environmental state judgment are remarkably improved, and the occurrence of false alarms and missing alarms is effectively prevented. Due to the fact that a control logic process of'absolute priority of environmental safety 'is adopted, the technical characteristic ensures that personnel safety is put at the first place under any condition, which is a core guarantee of high safety of the system, and the effect of the system is directly reflected as protection of life safety.

The invention discloses an indoor environment monitoring method based on thermal comfort analysis, and particularly relates to the field of indoor environment industrial data processing and monitoring, which comprises the following steps: deploying a temperature and humidity sensor and a carbon dioxide sensor based on gridding, dynamically clustering a personnel dense area and migrating nodes, the Manhattan distance and random sampling consistency technology is combined to execute fault self-inspection and calibration; infrared and millimeter wave radars and a color depth camera are integrated to acquire radiation temperature and physiological data. The sensor layout is optimized through the dynamic clustering algorithm, and the fault self-inspection technology is integrated, so that the monitoring reliability of the dense area is improved; multi-modal data are aligned by using space-time diagram convolution, and privacy security is ensured in combination with a dual-encryption mechanism; the multi-region air distribution is coordinated based on the block chain to avoid conflicts; adopting reinforcement learning to construct a heat transfer model fused with physiological parameters to enhance simulation adaptability; and on the basis of regulation and control of federal learning linkage equipment, global optimization of industrial data processing of personalized thermal comfort and energy consumption balance is realized.

The utility model belongs to the technical field of bird breeding, and relates to a multi-sensor controlled intelligent parrot brooding box which comprises a cuboid box body, a sensor box arranged on the inner side wall of the box body and opposite to a box door, a control display box arranged above the box door, and an air inlet fan arranged above the outer side wall of the box body. The switching power supply box is fixed on the inner side wall of the box body and is communicated with the air inlet fan; the ultrasonic humidifier is arranged on the side wall of the box body; wherein two ends of the sensor box are respectively provided with a sensor box air inlet hole and a sensor box air outlet hole, the built-in air filtering sponge covers the sensor box air inlet hole, and the sensor box air inlet fan is fixedly arranged at one end where the sensor box air inlet hole is located and is adjacent to the air filtering sponge; the temperature and humidity sensor and the carbon dioxide sensor are arranged on the inner wall of the sensor box; a single-chip microcomputer is arranged in the control display box, and a liquid crystal screen is arranged outside the control display box. The environment in the brooding box is intelligently controlled through the single chip microcomputer, and the growth and development and breeding production efficiency of nestlings is improved.

A chick transport vehicle based on intelligent environment control comprises a vehicle body and a compartment, an air conditioning system composed of a condenser and an evaporator is arranged in the front side of the compartment, a circulating fan of the air conditioning system is arranged in the front side of the compartment, a fresh air blower communicated with the outside is further arranged in the rear side of the compartment, and an intelligent control cabinet is arranged on the front side of one side of the compartment. The intelligent control cabinet is composed of a PLC, a temperature and humidity sensor, a carbon dioxide sensor, a pressure difference transmitter, an air filter bag and a computer display screen, wherein the temperature and humidity sensor, the carbon dioxide sensor and the pressure difference transmitter are evenly arranged on the top of the compartment. Intelligent automatic control over fresh air is achieved, and automatic entering of the fresh air, automatic discharging of carbon dioxide, automatic air overflowing of the compartment and automatic temperature control are achieved; the tail loading and unloading platform is effectively prevented from being opened due to bumping in the transportation process or being separated from the double-door structure to form a large gap, and the tail loading and unloading platform is closed more firmly in the transportation process.

The utility model discloses a low-concentration infrared carbon dioxide sensor probe which comprises a shell, a PCB (Printed Circuit Board), an infrared light source, a detector, a gas chamber mounting seat and a gas chamber upper cover, the air chamber upper cover is arranged at the bottom of an inner cavity of the shell, the air chamber mounting seat is arranged in the inner cavity of the shell and located above the air chamber upper cover, the infrared light source and the detector are arranged in the air chamber mounting seat and electrically connected with the PCB, the PCB is located at the top end of the air chamber mounting seat, and the air chamber mounting seat is arranged in the air chamber mounting seat. The inner cavity of the air chamber upper cover and the bottom wall of the air chamber mounting seat form an air chamber, and the bottom wall of the air chamber mounting seat is provided with a light source mounting hole for an infrared light source to pass through and a light outlet hole for a detector to receive infrared light. The utility model provides a low-concentration infrared carbon dioxide sensor probe which can improve the detection precision of low-concentration carbon dioxide.

The invention relates to a spectral analysis-based breeding air quality detection system, which comprises: a sensor module for detecting the concentration of ammonia gas, carbon dioxide and dust in a breeding environment in real time, the sensor module comprising: an ammonia gas sensor for quantitatively detecting the absorption characteristic of ammonia gas to light with a specific wavelength; the carbon dioxide sensor is used for measuring the concentration by adopting non-dispersive infrared light and utilizing the characteristic that carbon dioxide absorbs infrared light; the dust sensor is used for calculating the dust concentration by measuring the light scattering condition of particulate matters in the air; the data processing module is used for receiving detection data from the sensor module; according to the breeding air quality detection system based on spectral analysis and the detection method thereof, various pollutants can be accurately monitored on the basis of a modern spectral analysis technology, and real-time monitoring and dynamic adjustment of a breeding environment are realized through an intelligent data processing and automatic control mechanism, so that the health of bred animals is guaranteed, and the breeding production efficiency is improved.

The present application belongs to the technical field of factory planting of mushrooms, and particularly relates to a climate control system and method based on the growth and metabolism of mushrooms in a mushroom house, which comprises: a supply air temperature sensor, a supply air relative humidity sensor, a supply air carbon dioxide sensor, a supply air volume sensor, a house temperature sensor, a house relative humidity sensor, a house carbon dioxide sensor, a mushroom house climate control module, a house supply air distribution pipe, a pressure-regulated air outlet, mushroom culture material, a mushroom house air conditioning device, a supply air pipe, a return air pipe, a mushroom house, and a mushroom planting bed frame. The present application measures and calculates the metabolic rate, the release rate, and the parameter value of the water vapor and carbon dioxide release ratio in the mushroom house by measuring relevant climate parameters, and optimally controls the climate in the mushroom house based on the state of these growth and metabolism parameters, so that the climate control parameters in the mushroom house are matched with the growth and metabolism parameters of the mushrooms, and the goal of high-quality, high-yield, and low-consumption mushroom planting is achieved.

The invention provides a mine greenhouse gas emission monitoring system and a carbon emission climate influence calculation method, and the system comprises a sensor assembly which is integrated with a methane sensor, a carbon dioxide sensor, a wind speed sensor, an environmental parameter sensor and a data collection processor. The methane sensor and the carbon dioxide sensor emit laser signals to the oppositely arranged reflectors and receive laser feedback signals reflected by the reflectors, and a methane concentration detection value and a carbon dioxide concentration detection value are determined according to the laser feedback signals; the environmental parameter sensor detects the temperature, air pressure and humidity in the roadway; the wind speed sensor detects the wind speed in the roadway; and the data acquisition processor corrects the methane concentration detection value and the carbon dioxide concentration detection value according to the wind speed, the temperature, the air pressure and the humidity to obtain a methane concentration value and a carbon dioxide concentration value in the roadway. The methane concentration value and the carbon dioxide concentration value obtained by the scheme have higher accuracy, and basic measurement data are provided for calculating the emission of methane and carbon dioxide in a mine.

A coffin is provided, and the coffin includes a coffin body with a top opening and a coffin lid for closing the coffin body. The coffin lid is provided with an air intake hole and an exhaust air hole, the air intake hole and the exhaust air hole are respectively connected to an air intake device and an exhaust air device through pipelines to supply the oxygen required for decomposition of a body and exhaust waste gases. The coffin lid is further provided with an exhaust liquid pipe connected to a peristaltic pump. An oxygen or carbon dioxide sensor, and a hydrogen sulfide or ammonia concentration sensor are installed in an exhaust channel. The coffin body includes a plastic waterproof bag, and the coffin lid is pasted with adhesive plastic film. The function of the plastic waterproof bag is to prevent waste liquids from polluting the coffin body.

The invention discloses a stationary pollution source carbon emission continuous monitoring device, and relates to the technical field of air pollution detection, the stationary pollution source carbon emission continuous monitoring device comprises a case and a driving assembly, one side of the case is fixedly provided with a monitor main body, the bottom of the case is provided with a fixed pipe, and the outer side of the lower end of the fixed pipe is rotatably connected with a reversing pipe; and filters are arranged in the two ends of the reversing pipe. When the carbon emission content of a pollution source is monitored, the motor is started firstly, the sliding seat is driven to reciprocate through the double-output-shaft speed reducer and the reciprocating lead screw, the piston rod slides in one cavity in the case in a reciprocating mode, and therefore the air pressure change in the case is adjusted; the inside of one end of the reversing pipe is communicated with the inside of the case through the fixing pipe, so that external to-be-detected gas can be sucked into the case through the first one-way valve, and at the moment, the carbon dioxide sensor probe on the monitor main body can monitor the carbon content of the air.

The utility model discloses a carbon dioxide in-situ monitoring system and relates to the technical field of soil monitoring. Comprising a measuring box which is internally provided with a carbon dioxide sensor and is in communication connection with a monitoring unit; the measuring box comprises an upper measuring part and a lower measuring part, the lower measuring part is used for being installed on a soil layer, the middle of the lower measuring part is of a through structure, and an annular protrusion is arranged at the position, corresponding to the contour edge of the through structure, of the bottom of the lower measuring part; the lower measuring part is provided with a supporting column which is vertically and upwards arranged relative to the lower measuring part; the upper measuring part comprises a cover body and a measuring chamber located at the upper end of the cover body, the side edge of the measuring chamber is connected with the supporting column in a sliding sleeve mode and can slide up and down relative to the supporting column, so that the cover body can correspondingly cover the annular sealing structure at the edge of the through structure of the lower measuring part, and an in-situ measuring cavity corresponding to soil is formed. The soil carbon flux measuring device has the measuring capacity of high portability and simplified operation process, and can meet the requirement of soil carbon flux measurement.

To provide a carbon dioxide recovery apparatus that can suppress deterioration of an adsorbent material therein even in a high ambient air temperature environment. A carbon dioxide recovery apparatus 1 includes: an ambient air temperature sensor that acquires an ambient air temperature at a location where a reactor is disposed; a carbon dioxide sensor that acquires a carbon dioxide concentration in the atmosphere; a humidity sensor that acquires a humidity in the atmosphere; and a flow rate controller that adjusts a flow rate of the gas flowing in the reactor by controlling the fan, an intake valve, and an exhaust valve based on the ambient air temperature, the carbon dioxide concentration, and the humidity so that the temperature of an adsorbent material in an adsorption step of adsorbing carbon dioxide on the adsorbent material does not exceed a preset threshold.

The utility model discloses a carbon emission monitoring device which comprises an installation box arranged on a flue gas emission pipe, a carbon dioxide sensor is arranged in the installation box, the detection end of the carbon dioxide sensor extends into an opening of the flue gas emission pipe, and a rotating ring is arranged on the outer wall of the installation box and surrounds the detection end of the carbon dioxide sensor. A driving device is further arranged on the mounting box, a cleaning rod is arranged on the rotating ring, a cleaning piece is arranged on the side wall of the cleaning rod, and the cleaning piece abuts against the detection end of the carbon dioxide sensor. The detection end of the carbon dioxide sensor can be timely cleaned on line through the cleaning rod annularly arranged on the peripheral side of the detection end of the carbon dioxide sensor, so that the carbon dioxide sensor keeps high monitoring precision, and then high-precision monitoring of carbon emission is achieved. According to the carbon emission monitoring device, the detection end of the carbon dioxide sensor can be cleaned in time through cooperation of the cleaning rod and the cleaning piece, and the carbon emission monitoring device has the use advantage of being high in monitoring precision.

The invention relates to the technical field of air conditioning, in particular to a management system for centralized control of air conditioners, which comprises an environment sensing module for acquiring the real-time concentration reading of a carbon dioxide sensor, establishing the current CO2 concentration value, judging the general situation of personnel and generating a regional state evaluation result. According to the method, the personnel density is judged by obtaining the carbon dioxide concentration reading in real time, the regional personnel activity state is evaluated, meanwhile, the reasonable temperature and fresh air volume benchmark is set according to the particulate matter pollution level, and the pertinence of air quality control is enhanced. And the determination mode of the air conditioning demand intensity is refined through quantitative calculation of the health and comfort difference, so that the adjustment of the temperature and the fresh air volume better meets the actual demand. The priority of the temperature or the fresh air volume is dynamically judged based on the air conditioning demand intensity, the control weight serves as a quantitative reference, the flexibility of an adjusting strategy is reasonably improved, and the hysteresis of a traditional static control mode is avoided.

The utility model discloses a grain situation insect gas pipeline air tightness automatic diagnosis system, which comprises an in-bin gas path system and an insect gas detection system, the in-bin gas path system comprises a plurality of gas path channels, and each gas path channel comprises an in-bin gas collecting pipe, an in-bin pipe outlet device, a control ball valve and a gas pipe connector, the in-bin gas collecting pipe, the in-bin pipe outlet device, the control ball valve and the gas pipe connector are connected in sequence; the insect gas detection system comprises an insect detection channel and a gas detection channel, the in-bin gas path system is connected with the insect detection channel and the gas detection channel through a first T-shaped tee joint, and the insect detection channel comprises an insect detection ball valve, an insect detection counting module, an insect collection bottle and a large air pump; the gas measuring channel comprises a gas measuring solenoid valve, a first filter, a replacement solenoid valve, a second filter, a one-way throttle valve, a carbon dioxide sensor, an oxygen sensor, a phosphine sensor, a diagnosis solenoid valve and a small gas pump. According to the utility model, the functions of real-time detection of gas in the granary, pest detection, counting, statistics and early warning, gas path pressure detection, gas tightness diagnosis and the like can be realized.

This item is a sensor for measuring the amount of carbon dioxide in the air.

The invention discloses an anti-freezing shallow groundwater monitoring system and method.The anti-freezing shallow groundwater monitoring system comprises a heat preservation water tank, a detection mechanism and a temperature control mechanism, a heat preservation layer is arranged on the outer side of the heat preservation water tank, and the top of the heat preservation water tank is connected with a water supply pipeline; the detection mechanism comprises a water quality analyzer, a carbon dioxide sensor, a first temperature sensor and a liquid level sensor, and a probe of the water quality analyzer, the carbon dioxide sensor, the temperature sensor and the liquid level sensor are arranged in the water tank and used for detecting underground water; the temperature control mechanism comprises a heating piece arranged at the bottom of the heat preservation water tank, a controller and a second temperature sensor arranged on the inner wall of the water tank, and the controller is electrically connected with the heating piece and the second temperature sensor to control the temperature of the heat preservation water tank. The anti-freezing shallow groundwater monitoring system provided by the invention has the advantages of adaptability to severe cold weather, low energy consumption and high reliability.

The application relates to a sampling device, in particular to a sampling device for real-time continuous analysis of end-exhaled air. The sampling device comprises first to fourth three-way valves, a first sampling ring, a second sampling ring, an air suction pump, a purge gas pipeline, an exhaled air pipeline, a carbon dioxide sensor and an analysis detector; the air inlets of the first sampling ring and the second sampling ring are connected with the purge gas pipeline through the first three-way valve and connected with the exhaled air pipeline provided with the carbon dioxide sensor through the second three-way valve; the air outlets of the first sampling ring and the second sampling ring are connected with the analysis detector through the third three-way valve and connected with the air suction pump through the fourth three-way valve; through linkage switching of the first to fourth three-way valves, the first sampling ring and the second sampling ring alternately carry out sampling and sampling, real-time accurate sampling of end-exhaled air in each breathing cycle and continuous sampling analysis are realized. The application has high time resolution, accurate end-exhaled air sampling and constant volume, and good consistency of detection results.