With the expanding scope of global change research, the measurement of gas fluxes has garnered increasing attention. Gas flux measurements typically include plant-atmosphere interface fluxes, soil-atmosphere interface fluxes, and ecosystem-atmosphere interface fluxes. Due to the spatial heterogeneity of soils, significant variations in soil respiration exist even within the same area and soil type. Therefore, scientists conducting soil respiration research often require multi-dimensional studies across space, time, and gas species to better elucidate the underlying mechanisms of soil respiration.
The LK-2200 Multi-Channel Subsurface-Surface Greenhouse Gas Automatic Analysis System offers exceptional expandability, supporting configurations with single- or multi-component gas concentration analyzers, as well as various gas isotope analyzers. It can connect to 8, 16, or 24 respiration dark chambers or transparent chambers, along with soil profile gas sampling probes. This system enables high-frequency monitoring of trace gas concentrations in soil pores, facilitating research on the effects of temperature, soil moisture, and fertilizer inputs on trace gas fluxes, production, and consumption. Through continuous and simultaneous monitoring of multiple greenhouse gases at different subsurface and surface locations, it provides deeper insights into soil responses to climate change and reveals the interconnected mechanisms within the soil and at the soil-atmosphere interface, as well as their differential responses to climate change.
Technical Principle
Key Features
Technical Parameters
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CO2/CH4/H2O Analysis Module (Optional) |
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Measurement Parameters |
CO2/CH4/H2O |
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Measurement Range |
CH4：0 - 100 ppm； CO2：0 - 10000 ppm； H2O：0 - 5% |
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Measurement Accuracy |
(At typical working concentrations, 5-min raw average, 1σ) CO2：0.1 ppm； CH4：0.01 ppm； H2O：10 ppm |
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Response Time (T90) |
<30 s |
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Output |
RS485 |
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Calibration |
Factory calibrated, no routine recalibration required |
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Input Voltage |
DC 12 V |
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Operating Current |
260 mA |
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Operating Environment |
-20 - 50 °C, < 95% RH |
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SMC Intelligent Multi-Channel Control System |
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Number of Channels |
1-36 channels (selectable) |
Operating Temperature |
-20 ~ 50 °C |
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Operation Method |
Touch Screen |
Humidity |
<99% R.H. (non-condensing) |
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Positioning Module |
BeiDou/GPS Dual-Mode (Optional) |
Sampling Flow Rate |
Standard 1 L/min, adjustable |
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Data Calculation |
Flux, Respiratory Rate |
Power Supply |
12 VDC |
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Weight |
12 kg |
Standard Gas Module |
Optional |
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Optional Modules |
Additional gas measurement modules, soil temperature/moisture sensors, 4G transmission module, GPS module, etc. |
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Expandability |
The main control board reserves multiple data transmission channels, allowing for the addition of accessories and sensors according to customer requirements. The software is independently developed and can integrate data from newly added sensors accordingly. The system can be simultaneously configured with soil respiration chambers and community photosynthesis chambers for soil-atmosphere interface observation studies, enabling a multi-dimensional trace gas monitoring system for interface emissions. |
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SFL-20 Long-term Soil Flux Chamber |
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Chamber Type |
Transparent (Aluminum Alloy) / Opaque (Acrylic) |
Power Supply |
12 V |
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Overall Dimensions |
530×351×208mm（L×W×H） |
Control Method |
Master Controller |
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Total Weight |
Approx. 5.0 kg |
Chamber volume |
2093 cm3 |
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Measurement Method |
Dynamic Pressure Balance Flow-Through Measurement |
Measurement Volume |
4188 cm3 |
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Operation Mode |
Controlled Automatic Open/Close |
Measurement Area |
314 cm2 |
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Automatic Open-Close Static Chamber |
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Chamber Style |
Transparent / Opaque |
Control mode |
Master Controller |
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Chamber Size |
50 × 50 ×40 cm（L×W×H） |
Power supply |
12 V |
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Chamber Weight |
Approx. 15 kg |
Measurement Volume |
100000 cm3 |
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Chamber Operation Mode |
Controlled automatic rotation (Top window 90°, Side window 45°) |
Chamber Measurement Area |
2500 cm2 |
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Actuation Method |
Electric Actuator |
Temperature Operation |
-40°C to 85°C |
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Material |
Aluminum alloy, Imported Transparent PC Board |
Sealing Method |
Sealing Gasket |
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Subsurface Profile Gas Sampling Device |
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Technical Principle |
Semi-permeable Membrane Gas Sampling Technology |
Control Method |
Master Controller |
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Dimensions |
500mm(L)×6 (customizable) |
Sensor |
Temperature Sensor |
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Material |
Semi-permeable Membrane, Aluminum Alloy Support |
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Manufactured ： Eco-mind, China
