EC150 CO2/H2O Open-Path Gas Analyzer
The CSAT3A has the following outputs:
- Ux (m/s)*
- Uy (m/s)*
- Uz (m/s)*
- Sonic Temperature (°C)*
- Sonic Diagnostic*
The EC150 has the following outputs:
- CO2 Density (mg/m3)
- H2O Density (g/m3)
- Gas Analyzer Diagnostic
- Ambient Temperature (°C)
- Atmospheric Pressure (kPa)
- CO2 Signal Strength
- H2O Signal Strength
- Source Temperature (°C)
*The first five outputs require the CSAT3A Sonic Anemometer Head.
Benefits and Features
- The unique optical configuration gives a slim aerodynamic shape with minimal wind distortion
- Analyzer and sonic anemometer measurements are synchronized by a common set of electronics
- The maximum output rate of 60 Hz with 20 Hz bandwidth
- Low power consumption; suitable for solar power applications
- Low noise
- Measurements are temperature compensated without active heat control
- Angled windows to shed water and are tolerant to window contamination
- Field rugged
- Field serviceable
- Factory calibrated over a wide range of CO2, H2O, pressure, and temperature in all combinations encountered in practice
- An 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
- Speed of sound 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
Campbell Scientific’s EC150 is an open-path analyzer specifically designed for eddy-covariance carbon and water flux measurements. As a stand-alone analyzer, it simultaneously measures absolute carbon-dioxide and water-vapor densities, air temperature, and barometric pressure. With the optional CSAT3A sonic anemometer head, three-dimensional wind speed and sonic air temperature are measured.
| 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 25⁰C |
| 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 |
| Gas Analyzer/Sonic Volume Separation | 5.0 cm (2.0 in.) |
| Warranty | 3 years or 17,500 hours of operation (whichever comes first) |
| Cable Length | 3 m (10 ft) from EC150 and CSAT3A to EC100 |
| Weight |
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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 |
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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/mole 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 |
|
| Precision RMS (maximum) | 0.004 g/m3 mmol/mol (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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| 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 ultrasonic signal processing and user-installable wicks considerably improve the performance of the anemometer under all rain events. |
Ambient Temperature |
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| Manufacturer | BetaTherm 100K6A1IA |
| Total Accuracy | ±0.15°C (-30°C to +50°C) |
