Campbell Scientific EC150 – CO2/H2O Open-Path Gas Analyzer

Name: Campbell Scientific EC150 - CO2/H2O Open-Path Gas Analyzer
SKU: EC150
Price: 26179.18 USD
Availability: InStock

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.

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SKU: EC150 Category: Campbell Scientific

Description
Additional information

Benefits and Features

New conformal coating helps protect sonic transducers in corrosive environments
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
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 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
Speed of sound determined from three acoustic paths; corrected for crosswind effects
Innovative signal processing and transducer wicks considerably improve performance of the anemometer during precipitation events

Detailed Description

The CSAT3A has the following outputs:

U_x (m/s)*
U_y (m/s)*
U_z (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.

Specifications

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 u_x, u_y) < ±4.0 cm s^-1 (for u_z) ±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 u_x, u_y) 0.5 mm s^-1 (for u_z) 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.