LI-7500DS Open Circuit CO2/H2O Intelligent Analysis System

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 stable measurements at field observation stations.

Main Features

working principle

LI-7500DS uses non dispersive infrared spectroscopy to measure CO in the air₂And H₂The 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 wavelengths₂And H₂O absorption, obtaining CO by calculating the degree of infrared attenuation in this band₂And H₂The gas concentration of O.

New features of the instrument

1. Accurate temperature control of the light source and detector ensures measurement stability even in large environmental temperature fluctuations.
2. The precise optical components greatly reduce its sensitivity to pollutants such as pollen, dust, etc. in natural environments.
3. Design of sapphire scratch resistant lenses with special light waves.
4. High performance controllable temperature brushless chopper ensures 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 calculations. The calculation results are consistent with your use of EddyPro in the office^®The results obtained from processing raw data are the same, but more timely. SmartFlux^®The system is FluxSuite^TMThe hardware foundation of the data online monitoring and management system.

technical indicators

CO₂measurement
·Calibration range: 0~3000 µ mol/mol
·Accuracy:<1%
·Zero drift (per ℃):
Typical ± 0.1 µ mol/mol
o zui 大 ±0.3µmol/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%
o zui 大 ±0.1%
·Regarding H₂Sensitivity of O (mol CO)₂/mol H₂O)：
Typical ± 2.00E-05
o zui 大 ±4.00E-05

H₂Omeasurement
·Calibration range: 0~60 mmol/mol
·Accuracy:<1%
·Zero drift (per ℃):
Typical ± 0.03 mmol/mol
o zui 大 ±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%
o zui 大 ±0.30%
·Regarding CO₂Sensitivity (mol H)₂O/mol CO₂)：
Typical ± 0.02
o zui 大 ±0.05

comprehensive
·Basic gas sampling frequency: 150Hz bandwidth: 5,10 or 20Hz;
·Analyzer: 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 ohm@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 level IEC IP65
·Power supply: 10.5~30 VDC
·Power consumption: Typical 4W @ 25 ℃, maximum 8W @ -25 to 50 ° C during operation
·User Interface: Windows^®platform

Analyzer probe
·Size: Diameter 6.5 cm, Length 30 cm
·Weight: 0.67 kg; base connected 1.3kg; cable length 200cm

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