Questions about flowmeter calibration?
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The flow rate shown is 35.5 t/h; after adjusting for pressure and temperature, it becomes 33 t/h. My question is: since the value indicated by the flow meter is the mass flow rate, then this value should remain unchanged after taking temperature and pressure into account. The mass flow rate should be constant under any conditions. I ask everyone for help in answering this.
What type of flow meter are you using? Vortex street or differential pressure? What is measured here is the volumetric flow rate.
What medium? What flow meter?
It definitely isn’t a mass flow meter; it must be a volume flow meter……
When the medium is an ideal gas or a liquid, its density is not necessarily constant; the introduction of temperature and pressure compensation can affect the measurement of flow rate. Examples include gas, superheated steam, hydrogen, and alcohols of different strengths
Looking at the PId graph, it’s an Aonuba flow meter
It is a volumetric flow meter; before compensation the display shows t/h, while after compensation it shows another value. So there’s a slight doubt: if it’s volumetric flow rate ahead, then that’s correct.
Temperature and pressure corrections are applied to density; what you originally measured was the mass flow rate at the density under operating conditions, and density changes with temperature and pressure
In simple terms, when measuring gas flow rate, due to the high compressibility of gases, it is necessary to take into account changes in gas density when converting conventional volume flow rates into mass flow rates; temperature and pressure compensation is used to address the issue of gas density under conditions other than those for which the system was designed