A DN50 vortex flowmeter has a liquid flow range of 3-50m3/h. Our calibration result on the oil flow standard device is that 10-50m3 /h meets the accuracy requirements, but the accuracy below 10m3/h is not qualified. How should we evaluate this flowmeter?
The flow range indicated in the vortex Street flow specification is the flow range used for a specific reference medium, such as liquid - such as normal temperature water.For other media, the available flow range will vary with the viscosity and density of the medium.Because the oil flow standard device uses diesel oil with a higher viscosity than water and a lower density than water as the calibration medium, the lower limit flow rate of the flowmeter will generally be increased accordingly, narrowing the range of available flow.Therefore, it is normal for the vortex flowmeter to have a small flow performance deterioration in the oil flow calibration device.Therefore, it is not difficult to infer that if the vortex street flow juice is calibrated with liquefied petroleum gas (LPG) (such a low viscosity medium), the opposite result will be better than that of water.
