LI-7500AThe open circuit carbon dioxide/water vapor analyzer is a high-speed, high-precision, non dispersive infrared gas analyzer that can measure the density of carbon dioxide and water vapor in turbulent air structures. By using the eddy covariance technique, these data are combined with air turbulence data measured by an ultrasonic anemometer to calculate carbon dioxide and water vapor fluxes.

LI-7500ABased on proven evidenceLI-7500Technology, in eddy covariance research, open circuit measurement of carbon dioxide/Water vapor, this instrument has always been in a primary position. Relying on newly invented optical solutions and system designs, bringLI-7500Has year after year reliability. And it has full backward compatibility, compatibilityLI-7500The data management application.

characteristic

※ Based on proven evidenceLI-7500platform

※ Low power consumption requirements（12W）

※ high-precision

※ 0.11 ppm CO2 RMS @ 10 Hz

※ 0.0047 ppt H2O RMS @ 10 Hz

※ On site highwayCO2/H2Omeasure

※ Very ideal for the application of eddy covariance

LI-7500AImproved and raisedLi-7500Performance of:

※ High speed analog input channels are used to assist sensors, such as ultrasonic anemometers(*large20Hzsampling)

※ Collect eddy covariance data and transmit it to an internal removable storage device, * large20Hz

※ Ethernet is used for bidirectional communication/Data transmission using standard network protocols

※ Multiple outputs, including Ethernet,SDM(Synchronous device measurement),RS-232High speed digital-Analog converter

※ Reduced energy consumption in cold environments, with a detachable housing design for use in low-temperature environments

Proven technology

LI-7500AIt can achieve precise, precise, and rapid carbon dioxide emissions/Water vapor measurement using non dispersive infrared spectroscopy（NDIR）Detection technology.NDIR NDIRIt has been proven to be a consistent high-speed and high-precision measurement technology for carbon dioxide and water vapor. sinceLI-CORSince the company began producing high-precision carbon dioxide sensors, there have been23In the year, the company is constantly improving and enhancing its measurement technology.LI-7500AThis is the result of continuous progress and influence.

Simplify the collection of eddy covariance data

integrateCO2/H2OMeasurement and ultrasonic anemometerU，V，WandTFour analog inputs

Collect integrated eddy covariance data and store it internallyUSBOn storage devices

LI-7500ASampling the process of collecting eddy covariance data, simplifying the setup, and collecting eddy covariance data in text file format makes it very easy to input into a spreadsheet file. Data collection software and communication interface convert text file formats to make them suitable for useEdiRe1There are no additional costs.

7550-101Equipped with an optional auxiliary sensor interface, providing a waterproof wiring terminal for connecting external sensors. Provide four universal options±5VInput, used for simulating data input, can enable any fast ultrasonic anemometer (includingCampbell ScientificThe company,Gill InstrumentsThe company,MetekThe company,AppliedTechnologiesThe company, andKaijoThe company,RM YoungCompany, etc

LI-7500AMultiple collection elements:

※ time

※ date

※ CO2 (mmol/m3Absorption ratio, orμmol/mol)

※ H2O (mmol/m3Absorption ratio, ormmol/mol)

※ （℃）

※ Pressure（KPa）

※ temperature

※ Cooling voltage（V）

※ Diagnostic value

※ External input1(For example)UUltrasonic output voltage

※ External input2(For example)VUltrasonic output voltage

※ External input3(For example)WUltrasonic output voltage

※ External input4(For example, ultrasound virtual temperature output voltage)

Integrated data storage

Ethernet enables global data connectivity and transmission

MovableUSBData storage device

New typeLI-7550The communication interface unit of the analyzer (excluding) has high-speed digital signal processing electronic components and is capable of collecting completed data, including carbon dioxide/Water vapor, ultrasonic anemometer, and diagnostic data.LI-7500AThere is a user programmable delay that allows for data collection to be sent to external storage devicesLI-7500ASynchronize output data with other additional devices.USBStorage device usage4GBIndustrial grade storage is open,LI-7550Can store20Oh my god10Hz 24The data of the channel can also be stored using larger storage devices, such as≥16 GB.

Multiple data output options

LI-7500ASupports four data output options, including Ethernet and linear numbers/Model conversion（DACs），RS-232Serial port, andSDMOutput forCampbellThe company's data collector can be selected5，10or20 HzOutput.

Ethernet –The instrument adopts industrial standardsTCP/IPNetwork protocol for network communication with computers

RS-232 –Serial port data output, connection speed read as115200At baud rate, * is large20Records per second. A software command or serial hardware control can also be used to questionLI-7500AIndividual data recording

number/Analog output –Six users can configure linearityDACsOutput, per second300Secondary digital signal processing

SDM –useSDMOutput and serial data can also be achieved50HzOutput rate