IRGASON
Campbell Scientific’s IRGASON fully integrates the open-path analyzer and sonic anemometer. Designed specifically for eddy-covariance 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 vapour, air temperature, barometric pressure, three-dimensional wind speed, and sonic air temperature. U.S. patent D680455
Benefits and Features
- Harsh Sonic Environment Option adds a conformal coating to transducers to better withstand corrosive environments
- 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 the time lag
- Low power consumption; suitable for solar power applications
- Measurements are temperature compensated without active heat control
- Low noise
- The maximum output rate of 60 Hz with 20 Hz bandwidth
- Angled windows shed water and are tolerant of window contamination
- Field rugged
- Field serviceable
- Factory calibrated over a wide range of CO2, H2O, pressure, and temperature in all combinations encountered in practice
- The 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 the performance of the anemometer during precipitation events
- An integrated in-situ, open-path analyzer and sonic anemometer specifically designed for eddy-covariance flux measurements.
- IRGASON simultaneously measures absolute carbon-dioxide and water-vapor densities, air temperature, barometric pressure, three-dimensional wind speed, and sonic air temperature.
| 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 |
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Gas Analyzer |
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| 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 |
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| -NOTE- | A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration. |
| Accuracy |
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| 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 |
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| -NOTE- | A temperature of 20°C and pressure of 101.325 kPa was used to convert mass density to concentration. |
| Accuracy |
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| 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 |
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| -NOTE- | The accuracy specification for the sonic anemometer is for wind speeds < 30 m s-1 and wind angles between ±170°. |
| Offset Error |
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| Gain Error |
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| Measurement Precision RMS |
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| 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) |
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| Total Accuracy |
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| Measurement Rate | 10 Hz |
Enhanced Barometer (option -EB) |
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| Manufacturer | Vaisala PTB110 |
| Total Accuracy | ±0.15 kPa (-30° to +50°C) |
| Measurement Rate | 1 Hz |
Ambient Temperature |
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| Manufacturer | BetaTherm 100K6A1IA |
| Total Accuracy | ±0.15°C (-30° to +50°C) |
| EC100 ingress protection | IP65 |
