The Pressure Decay test determines pressure loss measured over a fixed time and presented as the amount of absolute pressure change. The basic operation of a pressure decay test is to fill the test part to a specified target test pressure, isolate the test part circuit from the pressure source, stabilized the pressure, and measured the pressure loss over a defined test time. The test results for pressure decay provide a delta pressure loss as the result of a leak and reported as dP or dP/dT. The dP test reports the ‘pressure drop’ for the full test time. The dP/dT test measures the pressure drop and reports the ‘average pressure drop’ to specify the pressure loss in one second.
Example: dP and dP/dT test results
| dP Test | Test time | = 10 sec |
| Measured leak | = 1.0 psig | |
| Pressure drop | = 1 psig in 10 seconds | |
dP/dT Test |
Test time |
= 10 sec |
| Measured leak | = 1.0 psig | |
| Pressure drop | = 1.0 psig / 10 sec = 0.1 psig per second |
As standard, the pressure decay leak test methods can be performed with pressure (P) or vacuum (V) and results identified as dP, dV, dP/dT, or dV/dT.
Cincinnati Test Systems utilizesIP67 & IP68standards in all our pressure decay test solutions.
For more information please see our FAQ pagehere.
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