While it is not possible to use Logger Pro or LabQuest software to perform a custom calibration of the Spirometer, you can adjust the slope of the calibration equation to make the sensor more accurate.
To do this you will need a standard 2L calibration syringe. Attach the 2L syringe to the Spirometer and collect data. Push the syringe all the way in and out several times during data-collection.
Measure the volume using Logger Pro or LabQuest App. Determine the percent error in your measurement.
For example, if you delivered 2L to the spirometer and the software measured 1.90 L, you would have an error of 5%.
Go to the Calibration dialog and select on equation. Then increase the slope of the calibration equation to get rid of the error.
For the example above, you would want to increase the slope of the calibration equation by 5%.
You are now ready to collect data. Remember to zero the sensor before collecting data.