Manually span calibrate (via software)

Select the Span Check option in the Functions panel.

When the Span Check dialog box appears, select the span check port from the drop-down menu.

Each connected gas cylinder has a port assigned to it. Both ports are labelled clearly on the back of the AirCal 1000.

Calculate the dilution ratio.

Select the dilution ratio based on your calculation.

Press OK.

To start the recording of data every minute, select Start Reading in the Functions panel.

Wait 15 minutes for the flow rates to stabilize.

The MFC flow rate adjusts to track to MFM flow rate. This ensures the correct dilution ratio is maintained.

To stop data recording, select Stop Reading in the Functions panel. The data can then be cleared or exported to spreadsheet.

To stop the span check completely, select Stop Check in the Functions panel.

The dilution ratio can be checked manually using the equation shown.