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High Resolution O2 Measurements for Eddy Covariance Systems

OXY Flux

The OXY Flux is an optical oxygen amplifier with microoptode that delivers oxygen measurements at 10 Hz frequency. The oxygen meter can directly be connected to a Nortek Vector and transmits the measurement values via 0 to 5 V analog output. The system is designed for non-invasive eddy covariance measurements on land and in shallow waters down to 60 meters. The microsensor has a tip size of 30 ┬Ám, so there is only minimal flow disturbance. It delivers precise on-the-spot measurements. The inexpensive sensor can easily be exchanged. The OXY Flux is the solution to expand your eddy covariance measurement set-up.

  • O2 measurements with 10 Hz sampling rate for eddy covariance systems
  • Robust optical sensor construction
  • Single cable plug-and-play connection to Nortek Vector
  • Easy and inexpensive sensor exchange

Applications

Aquatic Eddy Covariance Measurements over a Dense Seagrass Bed

The graph on the left shows aquatic eddy covariance data measured over a 49 h period with the OXY Flux amplifier over a dense seagrass bed. Graph (A) shows the three velocity components and mean current velocity. Variations in the horizontal x- and y-velocities represent changing tidal currents. The oxygen concentrations measured with fast-responding optical fiber connected to the OXY Flux amplifier and an independent oxygen sensor are shown in (B). The fast-responding optical system produced a 'clean' signal with no spikes or abnormalities despite turbid field conditions. In (C) the cumulative oxygen flux over the 49 h period is depicted. (D) shows the hourly oxygen flux (error bars represent SE, n= 4). Positive flux values represent a release. Light (PAR) measured above the seagrass canopy and water depth with a clear tidal signal are plotted in (E). The daytime oxygen flux (D) had a strong correlation to light (E), whereas the nighttime flux was affected by current flow and wave action.

Data measured and provided by Amelie Berger and Peter Berg (Aquatic Eddy Covariance Research Lab, University of Virginia)


Technical

Specifications
Sampling rate10 Hz
Analog output0 to 5 V
Power supply12 VDC (via Nortek Vector power supply)
ConnectorTeledyne Impulse 6-PIN male (P/N AG-306-HP-SS)
CalibrationLinear calibration
Waterproof< 60 m
Dimensions (L x B x W)20 cm x 8 cm x 8 cm (cylinder)
Weight560 g

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