Soil gas flux meter

Soil gas flux meter is an automated system used to measure soil CO2 flux. The standard channel is 4 channels and can be expanded to 8 channels. Sensors for other gases can be added to the system.

　　

Soil gas flux meter

-Quantifying the role of urban areas in global carbon budgets primarily focuses on short-term studies of CO2 concentration, documenting spatial patterns across cities or individual locations.

-Record the actual flux of CO2 and its diffusion characteristics in urban environments.

-Assess potential impacts on climate and biosphere at all scales.

-Dynamics of Oil Carbon Emissions from Landfills

-Land

-Coal industry

-Volcano

-Forest

-Swamp

　　Detection Principle

Carbon dioxide in soil is produced through the respiration of plant roots and surrounding microorganisms, as well as heterotrophic microorganisms that metabolize plant litter and soil organic matter. The carbon dioxide produced in soil CCO2S (CO2 concentration in soil) moves from the production site to CCO2S (CO2 concentration in the chamber). This depends on the moisture and temperature of the soil. The moisture and temperature of the soil need to be measured through additional sensors. The pump sends a certain volume of gas sample from the chamber to the measurement system for detection.Online Soil Gas Flux SystemThe automatic measurement system can accurately measure CO2 exchange in soil, which is very useful for investigation or long-term measurement. The daily and seasonal patterns of CO2 evolution are the result of changes in soil moisture, temperature, carbon resources, and other factors. Long term measurements can be conducted in one location for weeks or months.

A known volume chamber is placed on soil by a robot arm and the rate of CO2 increase inside the chamber is monitored. Using this system, air is continuously sampled in a closed loop, and soil respiration rate is calculated, displayed, and recorded by instruments. The air inside the chamber is carefully mixed to ensure that the sampling is representative and does not create pressure differentials that affect the evolution of carbon dioxide on the soil surface.

Due to the inherent variability of soil, measurements are usually required at multiple locations to obtain reliable average soil CO2 flux values. To evaluate spatial variability and time measurement, it is possible to multiplex and measure up to 4 chambers (optional up to 8 chambers). Modular systems enable researchers to build their customized systems according to their requirements.

　　sensor position

Soil moisture, temperature, pressure, and other auxiliary sensors are built into each chamber.

　　Sensor protection level

CO2， Temperature and pressure infrared sensor (IP55)/soil moisture sensor (IP67)/auxiliary sensor interface: O2, H2S, CH4, NH3, VOC, etc. (IP55).

　　Airborne data collection

The pneumatic circuit transports the sample gas from the chamber to the control unit. Data analysis is provided by user-friendly software applications. Users can quickly draw meaningful analysis charts to evaluate and manage measurements.

　　Lithium battery power supply system

Each chamber system is powered by an internal rechargeable battery. Equipped with an external battery for long-term measurement.

　　Mechanical cavity arm system

A professionally designed robotic arm system can reduce interference from harsh environmental conditions such as wind, snow, precipitation, natural sunlight, and soil.

　　Technical data

　　scope of work

Temperature: -10 ° C to 45 ° C;

Relative humidity: 0 to 95% Rh;

Non condensing gas flow rate: maximum 1 L/min;

Sensor CO ₂: Range: 0-5.000ppm, Accuracy: 2%

Wind and rain resistance level: IP55

Memory: 18M onboard flash memory for data acquisition (32MB in total)

Battery life: up to 4 days

　　Electrode range and accuracy

CO₂： 0–5000 ppm 精度： ± 100 ppm

O ₂: 0-25% Accuracy: ± 0.2%

Flow rate: 0-1000 sml/min Accuracy: ± 10 sml/min

Humidity: 0-100% Accuracy: ± 3%

Temperature: -40 ° C to 125 ° C Accuracy: ± 0.3 ° C

Absolute pressure: 150-1150 mbar Accuracy: ± 15 mbar

　　cycle

A measurement in a place consists of two cycles. The first one is the waiting period, and the other is the measurement period. During the measurement process, as long as the measurement occurs at one location, these two cycles will be repeated continuously.

Including processor, sensor, pump, and backup battery, etc.