Email Document Reference

Enter your email address below and the reference for this document will be sent to shortly from webmaster@ceesi.com.

Title: Basic Dynamical Modeling Of Expanding Volume Flow Calibrators
Author: Thomas O. Maginnis
Source: 2002 Measurement Science Conference
Year Published: 2002
Abstract: Standard flow calibrators using the constant pressure expanding volume method employ a circular cylinder as the collection volume, with the volume expansion occurring parallel to the axis. The volume of gas collected in a given time is related to the measured axial displacement through a meter K-factor, (with dimensions of volume per unit axial displacement), that corresponds geometrically to the average interior cross-sectional area of the cylinder. The K-factor should be independent of displacement for a cylinder. This makes such a device flexible as to total volume collected and time consumed per run. Yet these meters as used do not take advantage of this displacement flexibility, but instead operate between geometrically fixed start and stop points. This leads to long run times at low flowrates. Any acceleration of the movable mass that seals the collected gas will frustrate the desired linear expansion of the collection volume at constant flow. It is necessary to understand these effects to optimally choose the start and stop points for each flowrate. The purpose of modeling the dynamics is to understand how dynamic factors limit the useful flow range of each such meter, so that such effects may be overcome or minimized.

In order to prevent spam and automated file downloads for documents within the Measurement Library, please follow the instructions below and then you will be able to email a reference to this article.