LEAK TESTING · ENGINEERING CALCULATOR
An isolated rigid chamber gives an average total gas influx from its pressure increase: Q = V Δp/Δt.
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Model
Calculate
Assumptions and use
Assume constant temperature and volume over the interval. The result includes real leakage, desorption, permeation and fixture background. Subtract a separately measured background only when the configurations and conditions are comparable. Temperature drift requires the correction shown below.
Worked example
For 0.75 m³ rising from 0.2 to 50 Pa in 600 s, total gas load is 0.06225 Pa·m³/s.
Record the units, gas, temperature, background and instrument settings with every result. Confirm the model assumptions before applying a calculated limit to a real test.
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