LI-8250 multi-channel soil N₂O/CH₄/CO₂/H₂The O flux long-term automatic measurement system is based on the LI-8250 multiplexer, LI-7810, LI-7820 gas analyzers, and multiple long-term monitoring chambers, to achieve long-term monitoring of the spatiotemporal heterogeneity of the monitoring sample site. One end of the LI-8250 multiplexer is connected to the LI-7810/7820 gas analyzer, and the other end is connected to a multi-point long-term monitoring and measurement room. The analyzer and gas room are uniformly controlled and data is integrated to process the flux results. This system integrates LI-COR's analyzer and software and hardware resources, enabling real-time acquisition of monitoring data from multiple terminals and remote monitoring system functionality.

system composition

l LI-8250 multiplexer (optional cellular module)
l LI-7810 CH₄/CO₂/H₂O Trace Analyzer
l LI-7820 N₂O/H₂OTrace gas analyzer
l 1-8 long-term monitoring chambers (8200-104 opaque long-term monitoring chamber, or 8200-104C transparent long-term monitoring chamber)
l SoilFlux PRO Soil Gas Flux Analysis Software
l Optional 8250-01 expansion to 36 channels

LI-8250 multiplexer

LI-8250Embedded flux calculation and storage module, flexible connection to gas analyzer, automatic execution of long-term measurement program for soil greenhouse gas flux.

LI-8250A multi-channel long-term observation system for soil carbon, nitrogen, and water fluxes, connected to 8 measurement rooms (expandable to 36 measurement rooms), has achieved the monitoring of soil CO at multiple points₂、 CH₄、 N₂O、H₂Long term and continuous monitoring of O flux. Meanwhile, the system can also be used for atmospheric CO₂、 CH₄、 N₂O、H₂O-profile research. In addition, by connecting other environmental sensors such as solar radiation, soil temperature, and soil moisture sensors, the correlation between environmental conditions and soil greenhouse gas flux can be studied.

main features

l Flexible connection of various gas analyzers
l Accurate, automatic, and repetitive measurement, no need for on-site monitoring
l Built in Wi Fi, mobile phones, tablets, and computers can connect through a browser
l Equipped with cellular module for remote access
l Contains soil greenhouse gas flux calculation module
l 8GB data storage

More powerful than LI-8150 in terms of functionality

l Flexible connection/replacement of third-party gas analyzers
l Contains flux calculation module
l Embedded Wi Fi
l Contains system control module
l Connect SDI-12 long-term measurement room
l Built in GPS

LI-7810/LI-7820 Trace Gas Analyzer

LI-7810 and LI-7820 are the new generation of high-performance, portable trace gas analyzers launched by LI-COR. Adopting the principle of optical feedback cavity enhanced absorption spectroscopy (OF-CEAS), it provides a new dimension for trace gas measurement and monitoring with high accuracy, stability, durability, and calibration free. LI-7810 is for measuring CH₄/CO₂/H₂O's high-precision analyzer,LI-7820high-precisionMeasure N₂O/H₂O.

l Accurate and stable measurement of CH₄Or N₂O， No need for frequent calibration
l After connecting the LI-8250 multiplexer, real-time flux data can be provided
l Compact in appearance, lightweight and compact, it can also be easily installed for long-term unmanned field measurements
l Low power consumption, maintenance free, both solar and AC power can support outdoor operation
l Easy to operate, just connect the pipeline and start measuring after preheating the machine

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Long term measurement room

8200-104 opaque long-term measurement room

8200-104 is designed based on the previous generation of long-term monitoring rooms, using validated and reliable technologies. The standard SDI-12 interface has been introduced to enable each measurement room to incorporate measurement data from other sensors.

The cover of the 8200-104 measurement room is made of white enamel that is conducive to reflection and is equipped with a shading plate. At the end of the measurement, the cover rotates away from the position of the soil ring to minimize interference with the soil. Long term placement after setting, automatic measurement at regular intervals.

8200-104C Transparent Long term Measurement Room

8200-104C is specifically used for net carbon exchange (NCE) research. During measurement, sunlight passes through a transparent cover to maintain continuous photosynthesis of plants on the surface of the soil being measured. At the end of the measurement, the cover rotates away from the measuring soil ring position and is placed for a long time. It is automatically measured at regular intervals.

SoilFlux PRO Soil Gas Flux Analysis Software

SoilFluxPRO^TMThe software is a professional soil greenhouse gas flux analysis software developed by LI-COR company in the United States. With this software, users can easily achieve a series of practical functions such as spatial visualization of greenhouse gas concentrations, statistical analysis of data variables, and recalculation of soil greenhouse gas fluxes.

Technical Parameter

Instrument Overview

Size:38.5 cm L × 52 cm W × 18.5 cm H
Weight:7.7 kg
Waterproof performance:Compliant with IEC IP55 standard
Work environment:Temperature -20~45 ℃, humidity 0~95% RH, no condensation
User data storage:8 GB
GPS：Accuracy 2.5 m CEP
Coverage Area:

Gas chamber distance LI-8250 maximum radius: 15.0 m, 1 extension pipeline per gas chamber
Gas chamber distance LI-8250 maximum diameter: 30.0 m, 1 extension pipeline per gas chamber

Pump:Flow rate between chamber and gas:~2 to 3 lpm, type of diaphragm pump (the pump in the analyzer will subsample the gas flow in LI-8250)
Pressure sensor:

Measurement range:20 ~ 110 kPa
Sensor accuracy: ± 0.4 kPa @ 50~110 kPa
Resolution: 0.006 kPa

communication

LEDDisplay:Power supply, status, network, USB status
connect:3 Ethernet interfaces, Wi Fi (available in some countries)
Wi-Ficompatibility:2.4 GHz, 802.11 a/b/g/n/ac
Interface:

USB-A： 1, sealed, used to connect LI-870 CO₂/H₂O analyzer
USB-A： 2 standards for internal data storage (file export) or Wi Fi adapters
RJ-45 Ethernet: 3 seals, used to connect LI-COR trace gas analyzer, local Ethernet network, or cellular network module. The interface can also be connected to a standard non sealed RJ-45 Ethernet cable.

Output interface:RS-422 communication and 24 VDC power supply, full duplex, 115200 baud+ 24 VDC output (limited to~1.8 A ± 15% per output port)

power supply

Power supply demand:10~30 VDC (optional 120 VAC or 240 VAC). When connecting LI-870, LI-8250 supplies power to LI-870. Other analyzers require independent power supply. The total power consumption of the system is shown in the table below

Note: a is the typical maximum power of LI-8250, with no additional startup power consumption;B is the actual power during the opening or closing process, not the power during the sampling period

8250-770AC-DC converter

Size:15 cm L × 12.5 cm W × 8.5 cm H
Weight:1.3 kg
Protective performance: compliant withIEC IP55 standard
Working environment: Dustproof and waterproof performance meets IP55 standardsTemperature -20~50 ℃
Power supply:100 ~ 240 VAC, 50/60 Hz, 120 VA
Output voltage:12 VDC, 6.67 A

Long term measurement room 8200-104 (opaque)

Dimensions (L × W × H): 48.3 cm × 38.1 cm × 33.0 cm
Weight: 7.3 kg
Air chamber volume: 3955 cm³
Measure soil area: 317.8 cm²
Protection level: IEC IP55
Air temperature sensor:Working temperature:- 20 ~ 50℃；Accuracy: ± 0.3 ℃ @ -20~50 ℃

Light sensor current input:Range: 0-100 μ A; Resolution: 1.5 nA; Accuracy: ± (0.37% of reading+8 nA) @ -20~50 ℃

SDI-12 Communication:Maximum number of devices: 10; Voltage output: 12 VDC, 200 mA

Long term measurement room 8200-104C (transparent)

Dimensions (L × W × H): 48.3 cm × 38.1 cm × 33.0 cm
Weight: 7.3 kg
Air chamber volume: 3955 cm³
Measure soil area: 317.8 cm²
Protection level: IEC IP55
Air temperature sensor:Working temperature: -20~50 ℃; Accuracy: ± 0.3 ℃ @ -20~50 ℃

Light sensor current input:Range: 0-100 μ A; Resolution: 1.5 nA; Accuracy: ± (0.37% of reading+8 nA) @ -20~50 ℃

SDI-12 Communication:Maximum number of devices: 10; Voltage output: 12 VDC, 200 mA

Origin and Manufacturer: LI-COR, USA