Howell-Mann Calculator

R 1 = M a M L P e P o [ 1 e M a M L P o V t 1 ] e M a M L P o V t 2
L : equivalent standard leak rate
V : internal volume of the device package cavity
Pₒ : atmospheric pressure absolute
Pₑ : pressure of exposure absolute
t₁ : time of exposure to Pₑ
t₂ : dwell time between release of pressure and leak detection
R₁ : measured leak rate of tracer gas =

Reverse Calculation

If R is measured at then L=
DISCLAIMER : Please contact Oneida Research Services, Inc. at (315) 736-5480 or Daniel Rossiter by email at for technical discussions regarding the application of the Howell-Mann equation.
30-sep-2016 v1.3