Thiết bị phân tích khí Gas CO2/H20 Campbell Scientific EC155

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Thiết bị phân tích khí Gas CO2/H20 Campbell Scientific EC155

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Thiết bị phân tích khí Gas CO2/H20 Campbell Scientific EC155

Overview

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 the CPEC200 system, which also includes the sample pump, datalogger, optional valve module, and optional scrub module to provide a zero air source. The EC155 with anemometer simultaneously measures absolute carbon dioxide and water vapor mixing ratio, sample cell temperature and pressure, and three-dimensional wind speed and sonic air temperature.

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 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 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

  • Rain: innovative signal processing and transducer wicks considerably improve performance of the anemometer during precipitation events

Detailed Description

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.

 

Specifications

Operating Temperature Range

-30° to +50°C

Operating Pressure

70 to 106 kPa

Input Voltage

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

  • ±1.5 kPa (> 0°C), increasing linearly to ±.3.7 kPa at -30°C (basic)

  • ±0.15 kPa (-30° to +50°C) (enhanced)

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

  • 3.9 kg (8.5 lb) for EC155 head and cables

  • 1.7 kg (3.7 lb) for CSAT3A head and cables

  • 0.4 kg (0.9 lb) for mounting hardware

  • 3.2 kg (7 lb) for EC100 electronics

Gas Analyzer

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

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)

0.15 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

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)

0.006 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

Measurement Path

  • 10.0 cm (3.9 in.) vertical

  • 5.8 cm (2.3 in.) horizontal

Transducer Diameter

0.64 cm (0.25 in.)

Range

  • ±30 m s-1 (for ux)

  • ±60 m s-1 (for uy)

  • ±8 m s-1 (for uz)

  • -50° to +60°C (for Ts)

  • ±170° (for wind direction)

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 ux, uy)

  • < ±4.0 cm s-1 (for uz)

  • ±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 ux, uy)

  • 0.5 mm s-1 (for uz)

  • 0.025°C (for sonic temperature)

  • 0.6° (for wind direction)

 

Download

Brochures

EC155 CO2 and H2O Closed-Path Gas Analyzer

Manuals

EC155 CO2 and H2O Closed-Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer

Technical Papers

Quantifying Frequency Response of a Low-power Closed-path CO2 and H2O Eddy-covariance System

EC150, IRGASON, or EC155: Which CO2 and H2O Eddy-Covariance System Is Best for My Application?

Damping Temperature Fluctuations in the EC155 Intake Tube

EdiRe Software for Micrometeorological Applications

Compliance

EC155 EU Declaration of Conformity

Miscellaneous

Performance Evaluation of an Innovative Sampling System for Closed Path Eddy Covariance Measurements

Using Molecular Sieve to Zero Infrared Gas Analyzers for Eddy Covariance or Atmospheric Profile Measurements

Field-Performance Verification of Carbon Dioxide, Water, and Nitrous Oxide Closed-Path Eddy Covariance Systems with Vortex Intakes Poster

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