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?
U. Dreher
A differential transducer is favorable. The reason is mathematical and quite trivial:
- The output signal of absolute pressure transducers will be a - usually quite large - static pressure component, overlaid by the differential pressure. Thus the "useful" signal is just a fraction of the whole signal.
- The differential pressure transducers measure just the pressure difference without a significant offset.
Given the same output range, the differential transducers will always offer the same or a better resolution than the absolute pressure transducers.
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