The interconnections and procedures followed when using gas flow measurement instruments are critical to obtaining accurate flow measurements. Errors can be introduced from; interactions between flow sources and flow measurement instruments, interconnecting plumbing, thermal instabilities and pressure variations. The introduced uncertainties can be especially large when measuring gas flow in situ at industrial installations. When flow measurements are taken, a temperature change or dynamic pressure change in the gas volume (connecting volume) between a flow source and the calibration instrument will cause a measurement error.
To read the full article please go to: http://drycal.mesalabs.com/wp-content/uploads/sites/5/2013/12/B4.4-268-Edward-Morrell-Interactions-between-gas-flow-measurement-instruments-and-gas-flow-sources-US.pdf
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