Software overview

This section provides descriptions of the relevant software features that you'll use with the LI-7500DS analyzer.

Dashboard

The dashboard provides status and diagnostic indicators, live data values, and graphs of flux results. In addition, it is used to configure the gas analysis settings, set eddy covariance parameters, connect with an LI-7700, connect with a biomet system, and connect with the SmartFlux Core System.

Instrument information

Information about the CO2/H2O gas analyzer is presented in this pane.

  • Connected to: Indicates the network name of the gas analyzer.
  • Head serial number: Serial number of the CO2/H2O analyzer sensor head.
  • DSI: Digital System Interface box serial number.
  • Instrument type: Indicates the model of the CO2/H2O analyzer.

Data logging status

  • Logging Status: Indicates Logging or Not logging.

  • USB Size: Total capacity of the USB drive on the SmartFlux Core System.

  • USB Free Space: Available capacity on the USB drive.

  • Last Run: Status of the last half-hour flux processing by EddyPro on the SmartFlux Core System. Gives the most recent date and time when data collection began with a link to download the results (direct connection required). A warning symbol (symbol) indicates that EddyPro data processing was unsuccessful.

  • Start: Starts logging.

  • Stop: Stops logging.

Instrument performance and connection status

Instrument status information is presented in the status pane.

Note: The warning symbol (symbol) next to any component indicates that it is in need of attention. Often it indicates that the software configuration and detected hardware are inconsistent. Start by confirming that data cables are connected, power supplies are on, and then check the software configuration.

  • CO2/H2O Analyzer: Status of the CO2/H2O gas analyzer (OK typically).

  • LI-7700: Status of the LI-7700 Open Path CH4 Analyzer. Serial Number of the instrument, if connected; otherwise None.

  • Biomet System: Status of the Biomet System, if installed. Serial Number if connected. Otherwise, None.

  • SmartFlux: Serial Number of the SmartFlux Core System.

  • Sonic Anemometer: Indicates the status of the sonic anemometer. For most models the software indicates: digital, model, make, and sampling configuration. Some models provide more details.

  • SmartFlux Status: None if not connected; OK of good; Assessing if unknown; Issues detected if an error is detected.

Graphs

Click on one of the three tabs on the left side of the graphing pane. The Real Time tab provides real-time graphing of measured variables. The Results tab displays eddy covariance flux results from the SmartFlux Core System. The Wind tab displays a graph of wind speeds by direction.

  • Real Time: Current data measured by the instrument. Click the button to open the charting.

Real time chart of measurements.

Note: It may take several minutes after you select a tab for data to load into the graph.

  • Results: Presents fully processed flux results (SmartFlux Core System required) for the variables that are measured at the site. Duration sets how many days of data are displayed (maximum of 7 days). Field sets the flux variable that is displayed. The variables available are:
    • H (W/m2),
    • LE (W/m2),
    • ET (mm/h),
    • CO2 Flux (µmol/m2/s),
    • CH4 Flux (µmol/m2/s; LI-7700 required),
    • u* (m/s),
    • CO2 (µmol/mol),
    • H2O (mmol/mol),
    • CH4 (µmol/mol; LI-7700 required).

Flux results on the win-GHG home page.

  • Wind speed: Presents mean wind speed by direction. Duration sets how many days of data are displayed.

Wind directions plot.

Data display

Measured variables are displayed on the right of the dashboard. To change a variable displayed click directly on a data value and select a new item from the Data Items menu.

Measurement data in the win-GHG home page.

The variables available for display are given in Table 6‑2.