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If using a laminar flow element, in conjunction with Poiseuille's equation, to calculate mass and volumetric flow rate, what would the benefit be to using two absolute pressure transducers to measure dP instead a single differential transducer? I am currently using a single differential sensor and a single absolute (for STP & mass flow calculations), but have become aware of an instrument that uses 3 absolute sensors to accomplish the same calculations. Why would this be done?

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  • $\begingroup$ Are all the sensors measuring to the same standard or accuracy? $\endgroup$ – Solar Mike Apr 4 '19 at 15:30
  • $\begingroup$ @SolarMike Yes. I am just having an issue in fundamentally understanding why one would choose two absolutes instead of a single differential to measure a pressure drop across an orifice.. $\endgroup$ – Gordon Apr 4 '19 at 18:58

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