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From: Ewalt Schultz <eschultz@fo*.co*>
Subject: Re: Gas flow meters (was gas blending)
To: m87stme@mt*.ch*.se* (Sten Meyer) (Sten Meyer)
Date: Thu, 2 Nov 95 13:22:26 EST
Cc: techdiver@terra.net

  
  Sten,	

  It's true that flowmeters are typically calibrated for fixed density.

  Using mass, not volumetric, flowmeters and the appropriate conversion
  factor for other gases or compounds, accurate flow rates (+/- 1%
  full scale including linearity over 15-25 degrees C) is available.

  The negitive is that I've only seen units (transducers) only able
  to handle a maximum 500 psi, to date.

  Mass flow flowmeters appear to offer the best opportunity because of 
  electronic correction of the PV = nRT relationships but to date, 
  there has not been a demand for development of transient flow 
  measurement of high pressure gases.

  Ewalt Schultz
  <eschultz@fo*.co*>

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