OPEC Open Path Eddy Covariance System

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Brochure

Dynamax is delighted to introduce the new OPEC (Open Path Eddy Covariance) system. A complete, fully integrated and robust system designed for continuous, long-term and immediate surface atmospheric CO₂ flux determinations by eddy covariance over forest, grassland or crop canopies.

The "plug-in, ready to use" system combines high quality component parts already proven and respected within the ecophysiological research community.

OP-2: ADC's open path CO₂/H₂O analyzer, developed from the NOAA design, is proven in research sites throughout the world. The open path design overcomes time lag effects of traditional closed path analyzers.

R3-50: Gill Instruments' highly respected 50Hz research sonic anemometer. The robust and easy to use sensor is ideally suited for research of large eddies at high mast levels and is fully synchronized with the OP-2.

EDDYMEAS: Windows based software package for data acquisition and post-processing of eddy covariance data. Developed by Max Planck Institute in Germany and used extensively in ecophysiological research sites across the globe.

Features

OP-2 - Open Path Analyzer
R3-50 - Sonic Anemometer
EDDYMEAS - Data Processing Software
Fully Integrated

Specifications

OP-2 Open Path Analyzer

Measurement Technique
Open path, absolute, infrared (NDIR) analyzer. Simultaneous CO₂ and H₂O measurements

CO₂
Typical range and resolution: 200-600 ppm (0.02 ppm)

H₂O
2 Typical range and resolution: 0-40 mb (0.05 mb)

Optical Path
80 cm (4 x folded 20 cm path)

Detector
Thermoelectrically cooled lead selenide (PbSe)

Filter Sampling System
3 narrow bandpass filters. Sampling at 3000 RPM (50 Hz)

Analog / Digital Outputs
Nominal 15 Hz, user-selectable gain and offset. Temperature compensated. Digitized through and synchronized with R3-50.

Power Requirements
Nominal 12 VDC (9.5-18) unregulated at 1.4A 17W

Construction
Anodized aluminum. Entire assembly is weather proofed.

Operating temperature
-25° C to 45° C

Weight
4.4 lbs. (2.0 kg)

R3-50 Sonic Anemometer

Ultrasonic Measurement
Ultrasonic sampling rate: 50Hz Parameters: UVW, Speed of Sound

Wind Speed
Range and resolution: 0-45ms, 0.1ms Accuracy: < ±1% RMS

Direction
Range and resolution: 0-360°, 1° Accuracy: < ±1°

Speed of Sound
Range and resolution: 300-370ms^-1 , 0.01ms^-1 Accuracy: < ±0.5% @ 20° C

Digital Output
Communications: RS422 full duplex, 8 data bits, 1 stop bit, no parity Baud rate: 2400-115200 Output rate: Selectable 0.4 to 50s^-1

Power Requirement
9-30 VDC <4W (eg.< 150 mA at 24 VDC or 300 mA at 12 VDC)

Operating Temperature
-40° C to 60° C

Moisture Ingress
IP65

Precipitation
Operational to 300mm/hr

Weight
2.2 lbs. (1.0kg)