LI-7500 series (including LI-7500, LI-7500A, LI-7500RS, LI-7500DS) open circuit CO₂/H₂The O gas analyzer has been widely used in the field of global vorticity covariance carbon flux monitoring. More than 90% of the flux observation stations of the Global Carbon Flux Observation Network (FLUXNET) use the LI-7500 series CO₂/H₂O gas analyzer.

LI-7500DS is a new generation of digital open circuit CO₂/H₂The O intelligent analysis system is designed for rapid measurement of CO in the atmospheric environment₂And H₂Designed by O,The low power consumption of up to 4W and almost maintenance free characteristics make it more suitable for long-term stable measurements at field observation stations.

main features

built-inSmartFlux^®system
SmartFlux^®The system will integrate EddyPro^®The functionality of the software is brought to your field site, like a powerful field computer that can perform real-time and complete vorticity flux calculations. The calculation results are consistent with your use of EddyPro in the office^®The results obtained from processing raw data are exactly the same, but more timely. SmartFlux^®The system is FluxSuite^®The hardware foundation of the data online monitoring and management system.

TECHNICAL INDEX

CO₂measure

·Calibration range: 0~3000 µ mol/mol
·Accuracy:< 1%
·Zero drift (per ℃): Typical ± 0.1 µ mol/mol, maximum ± 0.3 µ mol/mol
·RMS noise/resolution (typical @ 370 µ mol/mol CO)₂)：

o @5 Hz：0.08µmol/mol
o @10 Hz：0.11µmol/mol
o @20 Hz：0.16µmol/mol

·Gain drift (% of reading per ℃ @ 370 µ mol/mol):

Typical ± 0.02%
Maximum ± 0.1%

·Regarding H₂Sensitivity of O (mol CO)₂/mol H₂O)：

Typical ± 2.00E-05
Maximum ± 4.00E-05

H₂Omeasure

·Calibration range: 0~60 mmol/mol
·Accuracy:< 1%
·Zero drift (per ℃):

Typical ± 0.03 mmol/mol
Maximum ± 0.05 mmol/mol

·RMS noise/resolution (typical @ 10mmol/molH)₂O)：

o @5 Hz：0.0034 mmol/mol
o @10 Hz：0.0047 mmol/mol
o @20 Hz：0.0067 mmol/mol

·Gain drift (% of reading per ℃ @ 20 mmol/mol):

Typical ± 0.15%
Maximum ± 0.30%

·Regarding CO₂Sensitivity (mol H)₂O/mol CO₂)：

Typical ± 0.02
Maximum ± 0.05

comprehensive

·Basic gas sampling frequency: 150Hz. Bandwidth: 5,10 or 20Hz;
·Analyzer: Absolute Open Circuit Non Dispersive Infrared Solid State Detector
·Detector: Thermoelectric cooled lead selenide optical path length 12.5cm
·Data communication: Ethernet
·Air temperature thermistor: 10K Ω @ 25 ℃ thermistor

Measurement range:- 40~70℃
Accuracy: ± 0.25 ℃ @ -20~70 ℃
Resolution: 0.003 ℃ @ 25 ℃

·Pressure sensor

Measurement range: 20-110 kPa
Accuracy: ± 0.4 kPa @ 50~110 kPa
Resolution: 0.006kPa

·Working temperature range: -25 to 50 ℃ (can be expanded to -40~50 ℃ as needed)
·Relative humidity range: 0-95% (non condensing)
·Waterproof rating IEC IP65
·User Interface: Windows Environment PC Software
·Power supply: 10.5~30 VDC
·Power consumption: Typical 4W @ 25 ℃, maximum 8W @ -25 to 50 ° C during operation

Analyzer probe

·Size: Diameter 6.5 cm, Length 30 cm
·Weight: 0.67 kg; Connect the base 1.3kg; Cable length 200cm

DSIbox

·Size: 13.24cm x 14.64cm x 6.24cm (H x W x D)
·Weight: 0.93kg

Origin and Manufacturer: United StatesLI-CORcompany