OP2 Open Path CO2/H2O Analyzer

OP2 Open Path CO₂/H₂O Analyzer

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Brochure

Manual

The OP2 provides simultaneous rapid measurement of atmospheric fluctuations of carbon dioxide and water vapor. It has been specially designed to be used in conjunction with a sonic anemometer for eddy-covariance studies, where the correlation between fluctuations in CO₂ and H₂O with vertical windspeed are used to estimate vertical fluxes of CO₂ and water vapor.

Traditionally these measurements are made using a "closed path" analyzer, such as an ADC2250. Although the ADC2250 itself has a very fast response time (0.1 second), there is always a lag time between the sampling area and the analyzer some centimeters away.

Now using "state of the art" gas analyzer technology, OP2 has been especially developed to overcome these delayed responses.

Features

Open path design/Immediate response
Simultaneous CO₂/H₂O
0.02ppm CO₂ resolution
Weather proof
Power by 12V DC
Typical use with sonic anemometer and other
environmental sensors

Specifications

Measurement Technique
Open path, absolute, infrared (NDIR) analyzer. Simultaneous CO₂ and H₂0 measurements.

CO₂
Typical calibration range 200-600ppm Resolution 0.02ppm

H₂0
Typical calibration range 0-40mb Resolution 0.05mb

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

Optics
All exposed optics coated for weather and abrasion resistance

Detector
Thermometrically cooled lead selenide (pbSe)

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

Analog outputs
Nominal 15Hz. 5V

Power requirements
Nominal 12 volts DC (9.5 to 18) unregulated at 1.4A 17W.

Construction
Anodized aluminum. Entire assembly weather proofed. Calibration sleeve included. Instrument cable 5.5m.

Weight
2.5 lbs. (1.1kg)

Dimensions
Cylindrical; 37cm length x 7.6cm diameter