It is not possible to use our software to perform a typical custom calibration on any of our spirometers. But you can adjust the calibration to make them more accurate. You will need a 2L (or larger) calibration syringe to perform the calibration adjustment. A 2L calibration syringe can be acquired from several sources. We recommend A-M Systems (www.a-msystems.com)

If you have a Go Direct® Spirometer (GDX-SPR) you can adjust the volume correction factor in GA4 to make the sensor more accurate.

Attach a 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 for each cycle and determine the percent error of 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%.

Next, tap on the sensor icon in the bottom right corner of the application window. Find the sensor ID number. Tap or click on the (i) that is located next to the sensor ID. This will launch the device information dialog. Select Advanced at the bottom of the window. Increase the volume correction factor to account for the error in measurement.

The default correction factor is 1. From the example above, to correct for a 5% error in volume, you should increase the correction factor by 0.05. So you would type in 1.05. Tap or click on save after you have adjusted the correction factor.

You are now ready to collect data.

If you have a Spirometer (SPR-BTA) you can adjust the slope of the calibration equation to make the sensor more accurate.

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.

Go to the Calibration dialog and click on or select Equation. Then increase or decrease the slope of the calibration equation to get rid of the error.

You are now ready to collect data. Remember to zero the sensor before collecting data.

Published: August 22, 2019. Updated: August 8, 2020.