EC155

Name: EC155
Brand: Campbell Scientific
SKU: 45305
Availability: InStock

Closed-Path CO2/H2O Gas Analyzer

EC155

Orderable

Closed-Path CO2/H2O Gas Analyzer

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Configuration

Gas Analyzer Only, No Sonic Case-GHPart Number: 45305-GH-NA-BB-GC
CSAT3A & Gas Analyzer, w/Sonic Carrying Case-SSPart Number: 45305-SS-SC-BB-GC

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Model:: EC155
Item Number:: 45305
Warranty:: 3 years or 17,500 hours

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 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 vapor mixing ratio, sample cell temperature and pressure, and three-dimensional wind speed and sonic air temperature.

Key Advantages

Now with Vortex Technology
Use as part of closed-path eddy-covariance system

Technical Description

The EC155 has the following outputs:

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

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 data loggers; 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 performance of the anemometer during precipitation events

Specifications

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: ±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 - 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 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)