IRGASON Open Circuit Vortex Covariance Monitoring System

Patented design^a
Integrated gas analyzer and ultrasonic anemometer

Summary:

Campbell's IRGASON integrates an open circuit infrared CO2/H2O analyzer with a three-dimensional ultrasonic anemometer, designed specifically for measuring vorticity related fluxes. It is easier to install than standalone sensors and improves measurement accuracy.
IRGASON synchronously measures CO2/H2O, air temperature, atmospheric pressure, three-dimensional wind speed, and ultrasonic air temperature.

Advantages and characteristics:

The integrated design reduces the aerodynamic impact on the measured fluid when it passes through the sensor.
The infrared gas analyzer and ultrasonic wind speed are measured in the same space, avoiding the loss of high-frequency flux between the two sensors when measuring in different spaces
The infrared gas analyzer and ultrasonic anemometer share a set of electronic signal processing system, which better coordinates the measurement time without the need for time delay correction
Low energy consumption, can be powered by solar energy
◇ No heating required, temperature compensation during measurement
◇ Low noise, high accuracy
◇ Maximum output frequency 60Hz, 20Hz bandwidth
◇ Allow mild contamination of the window

◇ Window angled design, good water avoidance effect
Durable and sturdy, suitable for outdoor use
Through comprehensive practice, CO2，H2O， The factory calibration of atmospheric pressure and temperature has a wide range
Multiple diagnostic parameters
◇ Fully compatible with Campbell data collector: on-site settings, configuration, zero and span calibration can all be completed by directly connecting to the data collector
◇ Ultrasonic velocity: determined by three audio paths, corrected for the influence of cross winds
◇ Rain proof: The innovative combination of ultrasonic signal processing and audio transmitter receiver head with water absorbing rain proof mesh greatly improves the performance of anemometers during rainfall processes

Output:
◇ ux (m/s)
◇ uy (m/s)
◇ uz (m/s)
◇ Ultrasonic temperature (℃)
◇ Environmental temperature (℃)
◇ Ultrasonic diagnosis
CO2 density (mg/m3)
◇ H2O density (g/m3)
◇ Infrared gas analyzer diagnosis
◇ CO2 signal intensity
◇ H2O signal strength
◇ Atmospheric pressure (kPa)
◇ Source temperature (℃)
General performance indicators^b：

Suitable working temperature: -30 ℃~+50 ℃
◇ Standard pressure range: 70~106 kPa
◇ Input voltage: 10~16V DC
Power supply: 5W (25 ℃, stable state and startup)
Measurement rate: 60Hz
Output bandwidth: 5, 10, 12.5, or 20Hz; user-defined
◇ Output communication protocol: SDM, RS-485, USB, analog (only CO2 and H2O)
◇ Auxiliary input: Air temperature and pressure
IRGASON head and cable weight: 2.8kg (including cable)
EC100 electronic chassis weight: 3.2kg
◇ Cable length: 3m, from IRGASON to EC100
◇ Warranty: 3 years or 17500 hours of operation, whichever comes first

Performance indicators of gas analyzer^b，c：

◇ Optical path length: 15.37cm

Instrument performance:

Performance indicators of three-dimensional ultrasonic anemometer^b

accuracy^h

^{bias error
ux，uy：<±8.0 cm=''>±8.0>
uz：<±4.0 cm=''>±4.0>
Wind direction: ± 0.7 ° horizontal wind at 1 m s-1
gain error
Horizontal wind direction within ± 5 °:<>
Horizontal wind direction within ± 10 °:<>
Horizontal wind direction within ± 20 °:<>
Measurement accuracy RMS
ux , uy：1 mm s-1
uz：0.5 mm s-1
Ultrasonic temperature: 0.025 ℃
Wind direction: 0.6 °}

^{Technical parameters of pressure gaugeb}

Technical parameters of environmental temperature sensor^b

Manufacturer: BetaTherm 100K6A1IA
Total accuracy: ± 0.15 ℃ (-30 ℃~+50 ℃)

US Patent No. D680455

B is subject to change without prior notice.
C temperature of 20 ° C and atmospheric pressure of 101.325 kPa are used for the conversion between mass (molar) density and molar ratio.
D Determine the use of appropriate standards for zero and span calibration of gas analyzers; CO2 span concentration is 400ppm; The dew point of H2O span is 12 ° C (16.7 ppt); Zero/span temperature is 25 ° C; zero/span air pressure is 84kPa; Subsequent measurements should be the same or close to the span concentration; The temperature distance from zero/span temperature shall not exceed ± 6 ° C; the ambient temperature shall be within the operating temperature range of the infrared gas analyzer.
The standard deviation of the calibration error.
The accuracy verification test conditions for f are: 25 ° C, 86kPa, 400 μ mol/mol CO2, dew point at 12 ° C, and a bandwidth of 20Hz.
Provide g0 to 3000 μ mol/mol as required.
The accuracy parameters of the ultrasonic anemometer are obtained from wind speed<30 ms-1='' wind direction=''>30>

Origin: Campbell Corporation, USA