Factors affecting the inaccuracy of orifice plate flow meters
Thread Content
What are the factors that affect the accuracy of orifice plate flowmeters? (1) The orifice plate is worn or clogged. (2) The orifice plate is not installed correctly. (3) The pressure guide tube is clogged or leaking. (4) Changes in fluid temperature lead to changes in density, and the density of the fluid itself does not match the design specifications. I know these are the reasons; everyone, are there any other reasons?
One more thing: during the selection calculation, issues such as \"excessive or insufficient pressure difference\" and \"the original pipe diameter not being compatible with the selected orifice flow meter\" arise"
Another issue is the incorrect selection of the orifice plate!
Also, check whether the straight sections at the front and back meet the installation requirements!
If the pressure before the throttling device differs significantly from that in the calculations, it will cause severe distortion, and it is necessary to recalculate the maximum differential pressure.
For orifice plate flowmeters used to measure gas flow rates, the factors that affect their accuracy are as follows: 1: During actual operation, when the range of flow variations exceeds the range specified during the design of the flowmeter, this leads to a decrease in its precision. 2: The atmospheric pressure value set in the flow meter does not match that of the actual installation site. 3: The flow integrator does not take into account the compressibility factor of the gas when calculating the flow rate at standard conditions. 4: The accuracy of the sensors used for pressure and temperature compensation calculations is insufficient, resulting in a decrease in overall measurement accuracy. Wait.........
Additionally, sometimes small-signal rejection is also required.