Thiết bị đo gió 3 chiều + phân tích khí Gas CO2/H2O Campbell Scientific IRGASON

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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IRGASON Integrated CO2 and H2O Open-Path Gas Analyzer and 3-D Sonic Anemometer

 

Gọi 0904251826 để được trợ giúp

Thiết bị đo gió 3 chiều + phân tích khí Gas CO2/H2O Campbell Scientific IRGASON

Overview

Campbell Scientific’s IRGASON fully integrates the open-path analyzer and sonic anemometer. Designed specifically for eddy-covariance flux measurements, the patented design is easier to install and use than separate sensors and provides increased measurement accuracy. The IRGASON simultaneously measures absolute carbon dioxide and water vapor, air temperature, barometric pressure, three-dimensional wind speed, and sonic air temperature. U.S. patent D680455

For more information about the benefits of having a co-located measurement, refer to the poster "Improved eddy flux measurements by open-path gas analyzer and sonic anemometer co-location."

Benefits and Features

  • Combined support structure causes less flow distortion than two separate sensors

  • Truly colocated gas analyzer and sonic anemometer measurements avoids flux loss due to sensor separation

  • Synchronized gas analyzer and sonic anemometer measurements avoid the need to correct for time lag

  • Low power consumption; suitable for solar power applications

  • Measurements are temperature compensated without active heat control

  • Low noise

  • Maximum output rate of 60 Hz with 20 Hz bandwidth

  • Angled windows shed water and are tolerant to window contamination

  • 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

  • Sonic Temperature: determined from three acoustic paths; corrected for crosswind effects

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

Detailed Description

The IRGASON has the following outputs:

  • Ux (m/s)

  • Uy (m/s)

  • Uz (m/s)

  • Sonic Temperature (°C)

  • Sonic Diagnostic

  • 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)

Specifications

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 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°C (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

Ambient Temperature

Manufacturer

BetaTherm 100K6A1IA

Total Accuracy

±0.15°C (-30° to +50°C)

Download

Brochures

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

Manuals

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

Open Path Eddy Covariance System with IRGASON or EC150/CSAT3A Quick Deploy Guide

IRGASON Packing Information

Technical Papers

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

EdiRe Software for Micrometeorological Applications

Miscellaneous

High-Frequency Air-Temperature Fluctuations for Spectroscopic Corrections Poster

Benefits of Having a Co-Located Measurement Poster

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

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