IRGASON

Integrated CO2 and H2O Open-Path Gas Analyzer and 3-D Sonic Anemometer

Campbell Scientific’s IRGASON^® fully integrates the open-path analyzer and sonic anemometer. Designed specifically for eddy-covariance carbon and water flux measurements, the patented design is easier to install and use than separate sensors and provides increased measurement accuracy. The IRGASON^® simultaneously measures absolute carbon dioxide and water vapor, air temperature, barometric pressure, three-dimensional wind speed, and sonic air temperature. U.S. patent D680455

For more information about the benefits of having a colocated measurement, refer to the poster “Improved eddy flux measurements by open-path gas analyzer and sonic anemometer co-location.”

Benefits and Features

Combined support structure causes less flow distortion than two separate sensors
Truly colocated gas analyzer and sonic anemometer measurements avoid flux loss due to sensor separation
Synchronized gas analyzer and sonic anemometer measurements avoid the need to correct for time lag
Low power consumption; suitable for solar power applications
Measurements are temperature compensated without active heat control
Low noise
Maximum output rate of 60 Hz with 20 Hz bandwidth
Angled windows shed water and are tolerant to window contamination
Field rugged
Field serviceable
Factory calibrated over wide range of CO₂, H₂O, pressure, and temperature in all combinations encountered in practice
Extensive set of diagnostic parameters
Fully compatible with Campbell Scientific dataloggers; field setup, configuration, and field zero and span can be accomplished directly from the datalogger
Sonic temperature determined from three acoustic paths; corrected for crosswind effects
Innovative signal processing and transducer wicks considerably improve performance of the anemometer during precipitation events

Specifications

Patent	U.S. Patent No. D680455
Operating Temperature Range	-30° to +50°C
Calibrated Pressure Range	70 to 106 kPa
Input Voltage Range	10 to 16 Vdc
Power	5 W (steady state and power up) at 25°C
Measurement Rate	60 Hz
Output Bandwidth	5, 10, 12.5, or 20 Hz (user-programmable)
Output Options	SDM, RS-485, USB, analog (CO₂ and H₂O only)
Auxiliary Inputs	Air temperature and pressure
Warranty	3 years or 17,500 hours of operation (whichever comes first)
Cable Length	3 m (10 ft) from IRGASON^® to EC100
Weight	3.2 kg (7.1 lb) for EC100 electronics 2.8 kg (6.1 lb) for IRGASON^® head and cables

Gas Analyzer

Path Length

15.37 cm (6.05 in.)

A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration.

Gas Analyzer – CO₂ Performance
-NOTE-	A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration.
Accuracy	Assumes the following: the gas analyzer was properly zero and spanned using the appropriate standards; CO₂ span concentration was 400 ppm; H₂O span dewpoint was at 12°C (16.7 ppt); zero/span temperature was 25°C; zero/span pressure was 84 kPa; subsequent measurements made at or near the span concentration; temperature is not more than ±6°C from the zero/span temperature; and ambient temperature is within the gas analyzer operating temperature range. 1% (standard deviation of calibration residuals)
Precision RMS (maximum)	0.2 mg/m³ (0.15 μmol/mol) Nominal conditions for precision verification test: 25°C, 86 kPa, 400 μmol/mol CO₂, 12°C dewpoint, and 20 Hz bandwidth.
Calibrated Range	0 to 1,000 μmol/mol (0 to 3,000 μmol/mol available upon request.)
Zero Drift with Temperature (maximum)	±0.55 mg/m³/°C (±0.3 μmol/mol/°C)
Gain Drift with Temperature (maximum)	±0.1% of reading/°C
Cross Sensitivity (maximum)	±1.1 x 10^-4 mol CO₂/mol H₂O

Gas Analyzer – H₂O Performance
-NOTE-	A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration.
Accuracy	Assumes the following: the gas analyzer was properly zero and spanned using the appropriate standards; CO₂ span concentration was 400 ppm; H₂O span dewpoint was at 12°C (16.7 ppt); zero/span temperature was 25°C; zero/span pressure was 84 kPa; subsequent measurements made at or near the span concentration; temperature is not more than ±6°C from the zero/span temperature; and ambient temperature is within the gas analyzer operating temperature range. 2% (standard deviation of calibration residuals)
Precision RMS (maximum)	0.004 g/m³ (0.006 mmol/mol) Nominal conditions for precision verification test: 25°C, 86 kPa, 400 μmol/mol CO₂, 12°C dewpoint, and 20 Hz bandwidth.
Calibrated Range	0 to 72 mmol/mol (38°C dewpoint)
Zero Drift with Temperature (maximum)	±0.037 g/m³/°C (±0.05 mmol/mol/°C)
Gain Drift with Temperature (maximum)	±0.3% of reading/°C
Cross Sensitivity (maximum)	±0.1 mol H₂O/mol CO₂

Sonic Anemometer – Accuracy
-NOTE-	The accuracy specification for the sonic anemometer is for wind speeds < 30 m s^-1 and wind angles between ±170°.
Offset Error	< ±8.0 cm s^-1 (for u_x, u_y) < ±4.0 cm s^-1 (for u_z) ±0.7° while horizontal wind at 1 m s^-1 (for wind direction)
Gain Error	< ±2% of reading (for wind vector within ±5° of horizontal) < ±3% of reading (for wind vector within ±10° of horizontal) < ±6% of reading (for wind vector within ±20° of horizontal)
Measurement Precision RMS	1 mm s^-1 (for u_x, u_y) 0.5 mm s^-1 (for u_z) 0.025°C (for sonic temperature) 0.6° (for wind direction)
Speed of Sound	Determined from 3 acoustic paths (corrected for crosswind effects)
Rain	Innovative signal processing and transducer wicks considerably improve performance of the anemometer during precipitation events.

Basic Barometer (option -BB)
Total Accuracy	±3.7 kPa at -30°C, falling linearly to ±1.5 kPa at 0°C (-30° to 0°C) ±1.5 kPa (0° to 50°C)
Measurement Rate	10 Hz

Enhanced Barometer (option -EB)
Manufacturer	Vaisala PTB110
Total Accuracy	±0.15 kPa (-30° to +50°C)
Measurement Rate	1 Hz

Ambient Temperature
Manufacturer	BetaTherm 100K6A1IA
Total Accuracy	±0.15°C (-30° to +50°C)

Tengdar vörur

Granite 10

CRS456V

VWIRE 305

Granite 6

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