EC150 Analizador Gases Open-Path CO2/H2O
Diseño innovador
Uso como parte de un sistema eddy-covariance open-path o como IRGA autónomo
meteorología aplicaciones agua aplicaciones energía aplicaciones gas flux & turbulence aplicaciones infraestructuras aplicaciones suelo aplicaciones

Resumen

El EC150 de Campbell Scientific es un analizador open-path especialmente diseñado para medida de flujos eddy-covariance (covarianza torbellinos). Como analizador autónomo, mide simultáneamente densidades absolutas de dióxido de carbono y vapor de agua, temperatura del aire y presión barométrica. Junto con el cabezal anemómetro sónico CSAT3A (opcional), el EC150 mide también el viento en tres dimensiones y la temperatura del aire (sónica).

Leer más

Ventajas y características

  • Diseño óptico único que le transfiere una forma aerodinámica fina con una distorsión mínima del viento
  • Colocación cercana óptima del analizador y de la medida de viento
  • Bajo consumo, adecuado para aplicaciones con placa solar
  • Bajo ruido
  • Tolerante con la contaminación del visor
  • Las medidas incluyen compensación en temperatura
  • Soporte integrado con analizador y anemómetro sónico
  • Las medidas del analizador y anemómetro sónico se sincronizan en el tiempo
  • Field serviceable
  • Mantenimiento en campo
  • Amplio conjunto de parámetros de diagnóstico
  • Compatible con dataloggers Campbell Scientific; setup/configuración en campo y ajuste del zero y span en campo se pueden llevar a cabo directamente en el datalogger
  • Máxima velocidad de salida de 50Hz con ancho de banda de 25Hz
  • Ventanas anguladas para desprender el agua y que toleran contaminación de la ventana
  • Rain: innovative signal processing and transducer wicks considerably improve performance of the anemometer during precipitation events
  • Calibración en fábrica sobre un amplio rango de CO2, H2O, presión y temperatura, con todas las combinaciones que se puedan encontrar en la práctica

Imágenes

Descripción técnica

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.

Especificaciones

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
  • 2.0 kg (4.4 lb) for EC150 head and cables
  • 1.7 kg (3.7 lb) for CSAT3A head and cables
  • 3.2 kg (7.1 lb) for EC100 electronics

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/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
  • 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 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

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)
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

Manufacturer BetaTherm 100K6A1IA
Total Accuracy ±0.15°C (-30°C to +50°C)
EC100 ingress protection IP65

Compatibilidad

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000
CR1000X
CR200X (retired)
CR6
CR800
CR850

Miscellaneous

Product Compatible Note
CR216X (retired)
CR3000
CR5000 (retired)
CR9000X

Descargas

ECMon v.1.6 (10.7 MB) 29-03-2016

EC100-Series Support Software.

Preguntas frecuentes

Número de FAQs relacionadas con EC150: 21

Expandir todoDesplegar todo

  1. The molecular sieve is a non-hazardous material that can be shipped to any country.

  2. The molecular sieve is a direct replacement for the old magnesium perchlorate bottles. The molecular sieve may be used for any Campbell Scientific analyzer that used the old bottles.

  3. The bottles of sieve for drop-in replacement contain the pellets and a membrane on top. The membrane is necessary to keep the pellets contained while allowing gas to pass over the zeolite. The bottle has the same footprint as the old magnesium perchlorate bottles. The amount in each bottle is listed on the bottle. The amount of sieve needed for each analyzer is the following:

    • The EC150 needs 22 g (drop-in bottle).
    • The IRGASON® needs 22 g (drop-in bottle).
    • The EC155 needs 22 g (drop-in bottle).
    • The AP200 needs 500 g (refill).
    • The 27423 needs 1000 g (refill).
    • The 31022 needs 500 g (refill).
  4. The molecular sieve has been demonstrated here by our engineering department to be effective at removing CO2 and H2O from the air sample. The change was made for two reasons:

    1. It was a safer alternative than using the previous chemicals.
    2. Increased shipping regulations for the chemicals limited the number of suppliers. 
  5. The factory calibration accounts for CO2 and H2O signal strengths down to 0.7. Therefore, to ensure quality data, windows should be cleaned before signal strengths drop below 0.7. 

  6. Yes. A fine-wire thermocouple, such as a FW05, can be used.

  7. The barometer and temperature sensor are needed because the IRGASON® and EC150 have been calibrated at the factory over a range of temperatures (-30° to +50°C) and barometric pressures (70 to 106 kPa). 

  8. The power requirement for the IRGASON® or EC150 with CSAT3A is 5 W at room temperature regardless of whether it is powering up or under steady-state operation.  At extreme cold or hot temperatures, the power requirement reaches 6 W.

  9. The EC150 and IRGASON® can report a negative water concentration if enough liquid water accumulates on the optical windows. This is because the absorption spectrum of liquid water differs from that of water vapor. Typically, large rain droplets do not cause this phenomenon. Rather, misty or condensing conditions, which create a water film across the entire optical window, can cause this phenomenon. After the water film evaporates, the former measurement accuracy will be restored.  

    The IRGASON® and EC150 may also experience some amount of drift over time. If conditions are relatively dry and it has been a long time since a zero and span has been performed on the analyzer, it is possible to report a negative water vapor concentration. In this situation, perform a zero and span of the analyzer.  

  10. For greatest accuracy, Campbell Scientific recommends that a zero and a span be done on the EC150 or IRGASON®. However, if a span gas is difficult to obtain, at the minimum, perform a zero on the analyzer.  Performing a zero will correct the majority of drift experienced by the analyzer. Follow the zero procedure in the analyzer’s manual for details.

Casos de aplicación

Alaska: Measuring Fluxes in Forests
Scientists and land-use managers have long recognized the importance of forest lands for their role......leer más

Artículos y notas de prensa