Each LI-COR vorticity covariance system can collect complete biological and meteorological sensor data through LI-COR's data acquisition module (DAqM). The data collected by these sensors is synchronized with the gas analyzer and ultrasonic anemometer in time and fully integrated into the. ghg vorticity covariance data, which can be used for later data interpolation and flux result interpretation.

The DAqM data acquisition module is designed and manufactured by LI-COR for collecting Biomet data and providing it to the SmartFlux system. These data are time synchronized with EddyPro's vorticity covariance dataset and can be used for flux calculation and post-processing.

DAqMmain features

Easy to use - Start and run quickly using a graphical user interface, and achieve simple configuration through clearly labeled connectors.

Easy to expand - add additional digital, analog, or SDI-12 sensors as needed. Four or more DAqM modules can be connected together to provide over 72 analog inputs.

Flexible placement - DAqM modules can be placed within the flux footprint or within 50 meters of the top or bottom of the tower.

The system can be equipped with an optional DRM data storage module. If the system loses power, the DRM data storage module provides data backup storage, including low-frequency sensors and system controlled data collection priority. Equipping this module ensures uninterrupted collection of biological meteorological data even in the event of a power outage. The data storage module includes a backup battery to power the biosensor, so that the sensor can continue to collect data when the main power is disconnected. These data can be used for data interpolation in the post-processing process.


TECHNICAL INDEX

DAqMData Acquisition Module Analog inputs: 18 single ended or up to 9 differential inputs; 2 with built-in excitation voltage; 5 V; 25 mA； 2 optional currents or voltages Resolution: 24 bit SDI-12 input Digital input/output: 4; 5V logic output; 5V or 3.3V logic input Switching voltage output: 3; 9~30VDC; Maximum 1A, electric current should be charged 12V excitation voltage output: 1; Up to 200mA Sampling frequency: 1 time per second Communication: RS-485 input/output Power supply:+ 9 ~ 32 VDC Power consumption: 0.7~1 W

DRMdata storage module Communication protocol: RS-485 input or output Configurable power output: 4 Unregulated power output: 1 Adjust power output: 3 (maximum 24 VDC) Power supply demand:+ 9 ~ 32 VDC DC/DC converter: Convert the input 9-30 VDC to the required 12 VDC for sensors and components. Backup battery charger: Charge the backup battery when the main power is turned on, and switch to the backup battery when the main power fails. Data storage: 32MB; Typically, it can store Biomet data for over a month.

Temperature and humidity sensor (Vaisala HMP155) Radiation Shield (RM Young) Working temperature:- 80~+60℃ Working voltage: 7~28VDC Output signal: Voltage (0~1V, 0~5V, 0-10V) PT100 resistor RS485 Weight: 86g temperature sensor Range:- 80~+60℃ Accuracy: Voltage output ± (0.226-0.0028 × temperature) ℃ @ -80~+20 ℃± (0.055+0.0057 × temperature) ℃ @+20~+60 ℃ PT100 resistance ± (0.1+0.00167 × temperature) ℃ RS485 output ± (0.176-0.0028 × temperature) ℃ @ -80~+20 ℃± (0.07+0.0025 × temperature) ℃ @+20~+60 ℃ Relative humidity sensor Range: 0~100% RH Accuracy: +15~+25℃ ±1%RH（0~90%RH） ±1.7%RH（90~100%RH） -20~+40 ℃± (1.0+0.008 x reading)% RH -40~-20 ℃± (1.2+0.012 x reading)% RH +40~+60 ℃± (1.2+0.012 x reading)% RH -60~-40 ℃± (1.4+0.032 x reading)% RH Radiation shield Weight: Approximately 1kg Diameter: 11.9cm No power supply required

Flip bucket rain gauge (Texas Electronics TR-525M) Resolution: 0.1mm Accuracy: 1.0% @ 50mm/hr Rain collector diameter: 245mm Funnel depth: 183mm Splash protection:> 50mm Working temperature: 0~+50 ℃ Working humidity: 0~100% Weight: 1.2kg

Photosynthetically active radiation sensor(LI-COR LI-190R) Absolute calibration: ± 5% Sensitivity: Typical 5-10 µ A/1000 µ mol s-1m-2 Linearity: Maximum deviation of 1% (10000 µ mol s)-1m-2Within) Response time:< 1µs Temperature related: ± 0.15%/℃ Cosine correction: incidence angle within 82 ° Azimuth error: At a 45 ° elevation angle, the error within a 360 ° azimuth range is less than ± 1% Tilt error: will not cause errors due to fixed orientation Work environment:- 45~65 ℃, 0~100% RH (non condensing) Detector: High stability silicon photovoltaic detector (blue light enhanced) Sensor housing: anodized aluminum waterproof housing with acrylic diffuser and stainless steel screws; Sensor base with O-ring seal Size: 2.36 Dia x 3.63 cm H Weight: Head: 24g; 2-meter screw base: 60g Cable length: 2 meters, 5 m, 15 m, 50 m

Total solar radiation sensor(LI-COR LI-200R) Absolute Calibration: Calibrate using an Eppley Sunlight Intensity Meter (PSP) under natural sunlight,Typical error ± 3% (incident angle within 60 °) Sensitivity: Typical 75 µ A/1000 W/m2 Linearity: Maximum deviation of 1% (3000 W/m)2Within) Response time:< 1µs Temperature related: ± 0.15%/℃ Cosine correction: incidence angle within 82 ° Azimuth error: At a 45 ° elevation angle, the error within a 360 ° azimuth range is less than ± 1% Tilt error: will not cause errors due to fixed orientation Work environment:- 45~65 ℃, 0~100% RH (non condensing) Detector: High stability silicon photovoltaic detector (blue light enhanced) Sensor housing: anodized aluminum waterproof housing with acrylic diffuser, stainless steel screws; Sensor base with O-ring seal Size: 2.36 Dia x 3.63 cm H Weight: Head: 24g; 2-meter screw base: 60g Cable length: 2 meters, 5 m, 15 m, 50 m

Soil Moisture Sensor (Stevens Hydra Probe II) Dielectric constant: range 1~80, accuracy ± 1.5% or 0.2 Soil moisture content (non organic and mineral soils): ranging from 0 to saturation, with an accuracy of ± 0.01 WFV (for most soils) and a maximum of ± 0.03 (for fine soils) Conductivity: Range 0.01~1.5 S/m, accuracy ± 2.0% or 0.005 S/m Temperature: -10~55 ℃, accuracy ± 0.1 ℃

Net radiation sensor(single component Kipp & Zonen NR Lite2) Response band: 0.2~100 μ m Response time: less than 60s@95 % Sensitivity: 10 μ V/Wm-2 Non linearity: less than 1% Temperature related:- 0.1%/℃ Perspective: 180 ° up and down sensor Working temperature:- 40~+80℃ Weight: 490g

Net radiation sensor(four component CNR4) Response band: shortwave 300~2800nm; Long wave 4.5~42 μ m Response time: less than 18s@95 % Sensitivity: 7-20 μ V/Wm-2Shortwave; 5~10μV/Wm-2long wave Non linearity: less than 1% Temperature related: 5%/℃ (-10 ℃~+40 ℃) Viewing angle: 180 ° shortwave, 170 ° shortwave 180 ° upper long wave, 150 ° lower long wave Working temperature:- 40~+80℃ Weight: 850g

Soil Heat Flux Plate (Hukseflux HFP01) Sensitivity: 50 μ V/Wm2 Working temperature:- 30~+70℃ Sensor thermal resistance: less than 6.25 × 10-3km2/W Range: ± 2000W/m2 Expected accuracy:- 15%~+5%

Self calibrated soil heat flux plate(Hukseflux HFP01SC) Sensitivity: 50 μ V/Wm2 Resistance: 2 Ω Heating resistance: 100 Ω Working temperature:- 30~+70℃ Calibration voltage input: 9-15VDC Calibration voltage output: 0~2VDC Expected accuracy: ± 3% Calibration time: ± 3min@1.5W Average power consumption: 0.02 or 0.04W

Optional set

Optional configuration

DRMdata storage module If the system loses power, the DRM data storage module provides data backup storage, including low-frequency sensors and system controlled data collection priority. Equipping this module ensures uninterrupted collection of biological meteorological data even in the event of a power outage.
PhenocamPhenological lens Phenocam phenological lenses use durable outdoor cameras integrated into LI-COR's vorticity covariance system to record daily images and upload them to the server. You can log in to FluxSuite to view the images or download them to your computer. Phenocam is the NetCam SC for StarDot technology.

Origin and Manufacturer: United StatesLI-CORcompany