LI-7500 Open Circuit CO2/H2O Gas Analyzer-Global supplier

Room 639, Tangxing Digital Building, No. 6 Tangxing Road, High tech Zone, Xi'an City, Shaanxi Province

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 monitoringFlux observation network（More than 90% of FLUXNET's flux observation stations use LI-7500 series CO₂/H₂O gas analyzer.

LI-7500DS is a new generation of digital open circuit CO₂/H₂O intelligent analysis system,It is designed for rapid measurement of atmospheric environmentsCO₂andH₂Designed by O，Low of 8WPower consumption and almost maintenance free featuresdropMake it more suitable for long-term stable measurements at field observation stations.

Main features:


Low power consumption:Ensure that it can beOn the field stationConduct long-term positioning measurement	Continuous measurement in all directions：Okay, yesSampling and measurement of airflow in various directions，Thus, there can be multiple installation options and continuous data can be guaranteedmeasure.	Record complete vorticity covariance data：This includes wind speed data collected by ultrasonic anemometers and auxiliary meteorological, radiation, and soil data collected by the LI-COR Biomet system.

LI-7500DS adopts non colorMeasurement of Air by Scattering Infrared SpectroscopyCO₂andH₂The density of O. Infrared rays pass through a temperature controlled filter and then through an open sampling space to reach the infrared detector. CO in the sampling space of infrared radiation with specific wavelengths₂andH₂O absorption, by calculating the degree of infrared attenuation in this bandobtainCO₂andH₂The gas concentration of O.

New features of the instrument

1. Accurate temperature control of light sources and detectors, even in situations wherebigofenvironmentEven under temperature fluctuationsabilityEnsure measurement stability.

2. Precise optical componentsMake itexistnaturePollution in the environment(such as pollen, dust, etc.)The sensitivity is greatly reduced.

3. Design of sapphire scratch resistant lenses with special light waves.

4. High performance controllable temperature brushless chopper，Ensure long-term reliable operation.

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 calculationsResults related to your use in the officeEddyPro^®The results obtained from processing raw data are exactly the same, but more timely. SmartFlux^®The system isFluxSuite^TMThe hardware foundation of the data online monitoring and management system.

TECHNICAL INDEX

CO₂measure

·Calibration range:0~3000µmol/mol

·Accuracy:<1%

·zero drift(per ℃):

typical±0.1µmol/mol

maximum±0.3µmol/mol

·RMS noise/resolution (typical @ 370 µ mol/mol CO)₂)：

@5 Hz：0.08µmol/mol

@10 Hz：0.11µmol/mol

@20 Hz：0.16µmol/mol

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

typical±0.02%

maximum±0.1%

·answerH₂O's sensitivitylinear measure(mol CO₂/mol H₂O)：

typical±2.00E-05

maximum±4.00E-05

H₂O measurement

·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)：

@5 Hz：0.0034 mmol/mol

@10 Hz：0.0047 mmol/mol

@20 Hz：0.0067 mmol/mol

·Gain Drift(Reading% per ℃ @ 20 mmol/mol):

typical±0.15%

maximum±0.30%

·answerCO₂Sensitivity (mol H)₂O/mol CO₂)：

typical±0.02

maximum±0.05

comprehensive

·Basic gas sampling frequency:150Hz bandwidth: 5,10perhaps20Hz；

·Analyzer: Absolute Open CircuitNon dispersive infrared solid-state detector

·Detector: Thermal electric cooling lead selenide optical path length12.5cm

·Data communication: Ethernet

·Air temperature thermistor:10K ohm@25 ℃ thermistor

Accuracy:±0.3℃

resolving power:0.003℃@25℃

Signal noise:0.002℃ RMS@25 ℃ and 20Hz

·Pressure sensor

Range:50-110kPa

resolving power:0.006kPa

Signal noise:0.007kPa（RMS）

·Working temperature range:-25to50℃（Can be expanded as needed-40~50℃）

·Relative humidity range:095% (non condensing) waterproof rating IEC IP65

·Power Supply:10.5~30 VDC

·Power consumption: 8W@25 ℃, at startuphighest25W

·User interface:Windows^®platform

Analyzer probe

·Size: Diameter6.5 cm， 30cm in length

·HeavyQuantity:0.67 kgConnect the base1.3kg; cable length 200cm

DSIbox

·Size:

13.24cm × 14.64cm × 6.24 cm(H×W×D)

·Weight:0.93kg

Origin and Manufacturer: United StatesLI-CORcompany