Vacuum Decay Test Pass/Fail Calculator
🔬 Vacuum Decay Test Pass/Fail Calculator
Enter your micron readings and hold time to instantly determine if your HVAC/R system evacuation passes the decay test — with diagnostic guidance on failures.
System settings
Standard: New residential — pass threshold 500 microns. Based on ASHRAE guidelines and common field practice.
Micron readings
Micron level when you isolate the pump
Micron level at end of decay test
Duration of isolated decay period
Enter your readings above
Fill in the isolation reading, final reading, and hold time to get your instant pass/fail result.
Get accurate readings in the field. The DY610 Digital Vacuum Micron Gauge delivers ±1 micron precision with a configurable alarm at your target level — so you know the exact moment your system is ready to charge.