The LI-7700 methane analyzer is the world's first open circuit methane measurement device developed and tested by LI-COR Corporation in the United States after 4 years of research and development. The LI-7700 analyzer is lightweight, has low power consumption, and high frequency response, and is used to obtain descriptions of ecosystem CH₄CH necessary for flux₄Density data.

Rice paddies, swamps, wetlands, and other areas that produce CH₄The ecosystem generally does not have the conditions to configure scientific research instruments. LI-7700 Open Circuit CH₄The analyzer is designed specifically for use in remote field environments. The LI-7700 includes multiple innovative designs that significantly reduce on-site maintenance work, making it possible to collect continuous long-term data from remote sites.

LI-COR company has used the LI-7700 analyzer to collect CH data from various ecosystems₄Flux data, their environmental conditions vary greatly - from tundra belts in the Arctic Circle to tropical mangroves.

LI-7700 is an in-situ measurement of CH using vorticity covariance method₄The preferred tool for flux.

application area

LI-7700 can be easily integrated into LI-COR's vorticity covariance monitoring system, using PTP protocol GPS clock to synchronize with wind speed and other data. After SmartFlux processing, the data can be directly output as CH₄Flux. The LI-7700 with the optional LI-7550 can also be used in other monitoring fields. Measure methane emissions from ecosystems such as farmland, swamps, wetlands, and forests.

characteristic

The open circuit design of LI-7700 is atmospheric CH₄Flux measurement provides a first-class solution that meets various ecosystem observation requirements:

·The system has no air pump and pipeline channels, eliminating pressure drop, water vapor adsorption, and time delay effects, resulting in more accurate measurement results ·The system has low power consumption (~8 W) and can be powered by solar panels in the field for LI-7700 ·It can automatically clean the optical path, greatly reducing maintenance work and increasing data security ·Ultrasonic anemometer signal can be connected to analog input channel ·High speed data output; Ethernet interface ·Ultra light weight

TECHNICAL INDEX

LI-7700TECHNICAL INDEX

Resolution (RMS noise): 5 ppb @ 10 Hz, 2000 ppb CH₄
Measurement range: 0-25 μ mol/mol @ -25 ℃, 0~40 μmol/mol @ 25℃
Data communication: Ethernet (up to 40 Hz)
Linearity:<1% of reading
Operating environment:- 25~50℃，50~110 kPa
Output bandwidth: up to 20Hz
Power supply: 10.5~30 V DC
Power consumption: 8 W (during measurement), 16 W (during cleaning period)
Sensor size: diameter 14.33 cm, height 82.8 cm
Optical path size: 0.5 m physical optical path length, Measure the optical path length at 30 meters
Weight: 5.2 kg
User interface: Windows^®Software, operated through Ethernet

7700-101Technical specifications of mirror cleaner

Pump operating temperature:- 10~50℃
Weight: 3.2kg
Size: 44.5 cm × 32.8 cm × 15 cm
Cleaning solution volume: 4L

LI-7550TECHNICAL INDEX

Data storage: Removable USB storage device 16 Gigabyte (expandable)
Data communication: Ethernet、SDM、RS-232、DAC
Bandwidth: up to 20Hz
Input: Ethernet, 4 analog input channels, differential ± 5 V, 16 bits
Operating environment temperature:- 25～50℃
Power supply: 10.5-30V DC
Power consumption: usually 10 W
Size: 35 cm x 30 cm x 15 cm
Weight: 4.4 kg

Optional

LI-7550 analyzer interface unit

ordering information

LI-7700 Open Circuit CH₄Analyzer, including power cord, network cable, calibration device, cleaning components, fixed parts, manual, spare parts package, software CD.

Origin and Manufacturer: LI-COR Corporation, USA