Learn how to check your gauge’s calibration. This can be done quickly and easily in the field.
Why it Matters
Digital gauges can drift over time—even small errors affect airtightness results.
Surprisingly, tube issues (pinching, water, leaks) are more frequent problems and can cause larger errors than gauge drift.
A quick field calibration can catch both gauge and tubing issues, ensuring trustworthy data.
Do This before Every Test
Connect Channels A and B
Plug a clean pressure tube between Channel A and Channel B ports on the gauge.Set to Pressure Mode
Switch the gauge to show PrA and PrB readings.Wait for Stabilization
Allow time for pressure to equalize, considering any active time-averaging settings.Confirm Accuracy
Readings should match within 2%. If they do, your gauge and tubing are working properly.
If not, inspect tubes and fittings—replace or reroute until stable.
This quick check takes less than a minute and is recommended daily or before critical tests, preventing false readings or wasted trips.
Trouble Shooting Tips
Problem Indicator Likely Cause Fix
>2% difference pinched/blocked tube or gauge drift swap tubes; recheck
Slow leaks tube damage or loose connection replace tube/fitting
Water in tube erratic readings blow or drain tube
Sun/wind interference baseline readings drift shade or secure tubing
A simple channel-to-channel check is the fastest, most effective field test you can perform. It ensures both your gauge and tubing are functioning correctly—so your blower-door or duct tests are based on solid, reliable data.
