Home page

Whenever you first connect to the LI-8250 Multiplexer you will see the Home page. This is the primary page you will interact with and consists of the menu and four panes: Multiplexer, Real Time Variables, Graphs, and Device Network.

You'll see some or all of the following items:

Multiplexer

Features the Start button to initiate or stop a sampling sequence, and displays information about the status of the sampling sequence, including which port is active in the sequence, what phase the sequence is in, and the percentage of the sequence that is complete.

  • Start: Start or Stop a sampling sequence. The sampling sequence will run as configured until you choose to stop it.
  • Active Port: Displays the port that is currently being sampled.
  • Measurement: Current status of the sampling sequence.
    • Preparing is when the chamber is closing.
    • Active is when a sampling sequence is in progress.
    • Idle indicates that a sampling sequence has not been started.
  • Observation Phase: Indicates where the current observation is according to the configuration.
    • Waiting phase.
    • Delay is a programmed wait time.
    • Chamber closing indicates that the chamber is moving to the closed position.
    • Pre-purge is displayed while the pump is purging the sample lines in preparation for the measurement.
    • Observation (%) indicates that the observation is underway.
    • Post-purge indicates that the pump is purging sample lines after a measurement.
  • Sampling Sequence: Indicates what percentage of the sequence is complete at this time. This section also provides an estimate of the time to complete a measurement and the total time of the sequence.
  • Calibration Sequence: Shows state and progress of automatic calibration adjustments (8250-02 Calibration Manifold required).
    • Delaying indicates that the calibration schedule has started but the device has added a delay to complete a measurement.
    • Stabilizing indicates that the calibration is underway, but the device is waiting for the measurement to meet stability criteria.
    • Zeroing indicates that the zero is being adjusted.
    • Completed YYYYMMDD HHMMSS is the date and time that the calibration was finished.
    • Waiting indicates that the time is outside the scheduled calibration adjustment.
    • Failed YYYYMMDD HHMMSS indicates that the calibration did not succeed.

Real Time Variables

The Real Time Variables pane lets you select from multiple variables provided by the LI-8250 Multiplexer, LI-COR long-term chambers, LI-COR gas analyzers, and sensors to view them in real time. Selecting a variable from the menu will add that variable to your Real Time Variables list and clicking on the trashcan will remove the variable. You can change the order of your variables by clicking and dragging them to a different level in the list.

Graphs

The Graphs pane allows you to add any of the variables from your Real Time Variables list (up to two at a time) to graph the variable in real time. To graph a variable, click anywhere on the variable. The variable will turn gray and will begin being graphed in the Graphs pane. Clicking on the same variable again will deselect it and remove it from the graph.

The Graphs pane will only allow you to plot two variables at a time. To replace one of the variables in the graph, delete one of the variables being plotted. Then add the new variable you would like plotted.

Device Network

The Device Network pane gives an overview of the devices that are available and connected to your network. This pane will also show the different states of instruments.

Green icons indicate normal operation.
Yellow icons indicate that there is a problem.
A red icon indicates that communication between the LI-8250 Multiplexer and that device is not established.
A circle with an exclamation mark indicates a conflict between what device is connected to the port and how the port is configured in the user interface.

Hovering over a green chamber icon will provide you with flux readings from that chamber, while hovering over yellow or red icons provides you with some information about the issue with that device. Visiting the Diagnostics page can help you learn more about these issues.

The LI-870 CO2/H2O Analyzer, 8250-01 Extension Manifold, and 8200-104/C Long-Term Chamber icons are automatically added to the graphic once the data cables from those devices are connected to the LI-8250. Trace Gas Analyzers are added by connecting the tubing and data cable between the Trace Gas Analyzer and the LI-8250 (see Attaching gas analyzers), and then adding the block and selecting the Trace Gas Analyzer hostname. See Multiplexer and component blocks.