4 Steps to more effective gas flow calibration

By R Ainsworth, Fluke Calibration


Published in:

Electricity+Control, December 2014 (pages 20 - 22)

Enquiries: Email mark.phillips@ni.com


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The 4 steps to more effective gas flow calibration are:


1 Make leak free connections

You probably will not be able to establish a 100 % leak-free connection between the flow reference and the Unit Under Test.


2 Produce and maintain steady-state flow

Since the flow rate of the reference and the Unit Under Test are compared in real time during the gas flow calibration process, it is important that the gas system flow rate does not vary with time. Flow rate changes at one location in the plumbing system may not be reflected in other parts of the system.


3 Compare the reference and Unit Under Test over the same time period

Most process flow sensors have real time and continuous output indications.


4 Improve gas flow calibration results through automation

There are software applications that enable you to automate the flow calibration process. They provide data acquisition capability, allowing you to take multiple readings from your Unit Under Test and reference at the same time.


Take note

  • Gas flow sensor calibration requires making a leak free plumbing connection between the Unit Under Test and a flow reference.
  • Gas flow calibration devices that have been traditionally used to calibrate gas flow sensors have limitations.
  • The author suggests four steps to improve gas flow calibration results.