EC155 CO2/H2O Closed-Path Gas Analyzer
The EC155 has the following outputs:
- Ux (m/s)*
- Uy (m/s)*
- Uz (m/s)*
- Sonic Temperature (°C)*
- Sonic Diagnostic*
- CO2 Mixing Ratio (µmol/mol)
- H2O Mixing Ratio (mmol/mol)
- Gas Analyzer Diagnostic
- Cell Temperature (°C)
- Cell Pressure (kPa)
- CO2 Signal Strength
- H2O Signal Strength
- Differential Pressure (kPa)
- Source Temperature (°C)
*Requires a CSAT3A Sonic Anemometer Head.
Benefits and Features
- Vortex Intake (U.S. Pat. No. 9,217,692) greatly reduces maintenance frequency compared to traditional in-line filters
- Heated inlet increases protection against condensation
- More accurate pressure measurements with the new sample cell absolute pressure sensor
- Fully integrated, detachable intake
- Improved corrosion protection with the stainless-steel sample cell
- Improved sonic temperature from more rigid CSAT3 geometry
- Stream-lined, aerodynamic CSAT3A mounting
- Slim aerodynamic shape with minimal wind distortion
- Analyzer, sample cell, and sonic anemometer measurements have matched bandwidths and are synchronized by a common set of electronics
- Low power consumption; suitable for solar power applications
- Low noise
- Small sample cell for excellent frequency response
- Integrated zero/span connection for simplified field zero/span
- 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 data logger
- Rain: innovative signal processing and transducer wicks considerably improve the performance of the anemometer during precipitation events
Campbell Scientific's EC155 closed-path analyzer incorporates vortex technology for reduced maintenance, an absolute pressure sensor in the sample cell for more accurate measurements, and a sample cell with improved corrosion protection. The EC155 can be combined with the CSAT3A sonic anemometer, as shown in the main image. The revised CSAT3A has a more aerodynamic and rigid design.
The EC155 is ordered as part of a CPEC300-series system (CPEC300, CPEC306, or CPEC310), which also includes the sample pump, data logger, optional valve module, and optional scrub module to provide a zero air source. The EC155 with anemometer simultaneously measures absolute carbon dioxide and water vapour mixing ratio, sample cell temperature and pressure, and three-dimensional wind speed and sonic air temperature.
- CS EC155 CO2/H2O Closed-Path Gas Analyzer an in-situ closed path analyzer specifically designed for eddy covariance flux measurements.
- As a stand-alone analyzer, it simultaneously measures absolute carbon dioxide and water vapour densities, sample cell temperature and pressure.
- With the optional CSAT3A sonic anemometer head, it also measures three dimensional wind speed and sonic air temperature.
| Operating Temperature Range | -30° to +50°C |
| Operating Pressure | 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 |
| EC100 Barometer Accuracy |
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| Sample Intake/Sonic Volume Separation | 15.6 cm (6.1 in.) |
| Warranty | 3 years or 17,500 hours of operation (whichever comes first) |
| Cable Length | 3 m (10 ft) from EC155/CSAT3A to EC100 |
| Weight |
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Gas Analyzer |
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| Sample Cell Thermistor Accuracy | ± 0.15°C (-30° to +50°C) |
| Sample Cell Pressure Accuracy | ± 1.5 kPa (> 0°C ), increasing linearly to ±3.7 kPa at -30°C |
Gas Analyzer - CO2 Performance |
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| Accuracy |
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| Precision RMS (maximum) | 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) | ±0.3 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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| Accuracy |
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| Precision RMS (maximum) | 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) | ±0.05 mmol/mol/°C |
| Gain Drift with Temperature (maximum) | ±0.3% of reading/°C |
| Cross Sensitivity (maximum) | ±0.1 mol H2O/mol CO2 |
Sonic Anemometer |
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| Measurement Path |
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| Transducer Diameter | 0.64 cm (0.25 in.) |
| Range |
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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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