Internal pressure and vacuum monitoring apparatus

Details Internal pressure and vacuum monitoring apparatus Internal pressure and vacuum monitoring apparatus

1977-07-15

1978-10-03

Woodiel, Donald O.

Measuring and testing

Testing sealed receptacle

209599, 209597, G01M 336

Patent

active

041177185

ABSTRACT:
An apparatus and method for monitoring the internal pressure or vacuum in a sealed container is provided which measures the amount of deflection of a flexible wall of the container as a function of the internal pressure. The apparatus provides a first electrical signal representative of the distance between a first point on the flexible wall and a first sensing means and a second electrical signal representative of the average of the distances between at least two other points of the flexible wall and second sensing means. The two signals are compared and a third signal indicative of the deflection of the flexible wall is provided.

REFERENCES:
patent: 3392829 (1968-07-01), Keinanen
patent: 3802252 (1974-04-01), Hayward et al.

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