What special requirements does the turbine flowmeter have for the medium to be measured?

Turbine flowmeters are widely used in the field of measuring liquids and pure gases. Turbine flowmeters have the advantages of high precision, good repeatability, no zero drift, and high turndown ratio. The turbine flowmeter has high-quality bearings and specially designed guide vanes, so the wear is greatly reduced, it is not sensitive to peaks, and it can also give reliable measurement variables even under harsh conditions. The output signal of the turbine flowmeter is pulse, which is easy to digitize. The pressure loss of the turbine flowmeter is small, the blade can be anti-corrosion, and can measure viscous and corrosive media. ① The uneven distribution of flow velocity and the existence of secondary flow in the pipe are important factors affecting the measurement accuracy of the turbine flowmeter. Therefore, the turbine flowmeter has certain requirements for the upstream and downstream straight pipe sections. For industrial measurement, the straight pipe length of 20D upstream and 5D downstream is generally required. ② The turbine flowmeter has high requirements on the cleanliness of the fluid, and a filter must be installed in front of the flowmeter to ensure the cleanliness of the fluid. The filter can be funnel-shaped, and its own cleanliness can be obtained by measuring the change in differential pressure at both ends. ③ In order to ensure that the liquid passing through the flowmeter is single-phase, that is, air or steam cannot enter the flowmeter, and an air eliminator should be installed upstream of the flowmeter if necessary. For liquids that are easy to vaporize, a certain back pressure must be guaranteed downstream of the flowmeter. The back pressure can be twice the pressure drop of the flow sensor at the maximum flow rate plus 1.2 times the vapor pressure of the measured liquid at the highest temperature. In order to eliminate the secondary flow, it is best to install a rectifier at the upstream end. If the upstream end can ensure a straight pipe section of about 20D and install a rectifier, the measurement accuracy of the flowmeter can reach the accuracy level when it is calibrated.

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