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

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

Overview