Measurement of container volume by connecting it at atmospheric pressure to a vacuum pump which has a flow constraint and measuring the time taken to reach a predetermined pressure .

摘要

A container (6) is connected at atmospheric pressure (P1) by a tube (9) to a Venturi (1) which acts as a vacuum pump generating a low pressure (P2). A constraint (5) on flow into the pump is fitted between the container and pump and a pressure sensor (4) detects a predetermined container pressure (Pc). The time take to reach the assigned container pressure (Pc) is measured and used to determine the container volume