Selection points of rotor flow meter

Abstract: The key points of selection of rotameter flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The rotameter is a device that estimates the flow by measuring the (position) of the rotating parts in the DC pipeline. It has the advantages of accurate measurement, stable performance, flexible use, and high reliability. How should the user use the rotameter? Let's go. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the selection points of rotor flowmeters. The rotameter is a device that estimates the flow by measuring the (position) of the rotating parts in the DC pipeline. It has the advantages of accurate measurement, stable performance, flexible use, and high reliability. How should the user use the rotameter? The following will introduce the selection points of the rotameter in detail, hoping to help everyone. 1. The rotameter must be installed vertically on a vibration-free pipeline. The fluid flows through the flowmeter from bottom to top, and the verticality is better than 2°, the horizontal angle is better than 2 when installed horizontally°;(Now there are rotameters that can be installed horizontally) 2. In order to facilitate maintenance and replacement of flowmeters and cleaning of measuring pipelines, bypass pipelines and bypass valves should be installed on metal tube rotameters installed on process pipelines; 3. There should be a straight pipe section with a length of more than 5 times the pipe diameter at the inlet of the rotameter, and a straight pipe section of 250mm at the outlet; 4. If the medium contains ferromagnetic substances, a magnetic filter should be installed; if the medium contains solid impurities, it should be considered. A filter is installed between the valve and the straight pipe section; 5. When used for gas measurement, the pipeline pressure should be ensured not less than 5 times the pressure loss of the flowmeter, so that the float can work stably; 6. In order to avoid the flowmeter caused by the pipeline Deformation, the flange of the process pipeline must be coaxial with the flange of the flowmeter and parallel to each other, the pipeline is supported to avoid pipeline vibration and reduce the axial load of the flowmeter, the control valve in the measurement system should be installed downstream of the flowmeter: 7 . When measuring gas, if the gas is directly discharged into the atmosphere at the outlet of the flow meter, a valve should be installed at the outlet of the meter, otherwise, the pressure drop at the float will cause data distortion. 8. When installing a PTFE-lined instrument, the flange nut should not be tightened asymmetrically too tightly, so as not to cause deformation of the PTFE lining; For meters powered by lithium batteries, try to avoid direct sunlight and high temperature environments (≥65°C) so as not to reduce the capacity and life of the lithium battery. Note on model selection 1. For the selection of the metal tube float rotameter of the remote transmission type, it is necessary to choose the rotameter suitable for the explosion-proof type of the place of use; during installation, attention should also be paid to the tightening of the shell and the sealing of the wiring port after the instrument is energized. It has reached the requirements of explosion-proof, protection and anti-erosion. 2. For the measured medium temperature is too high (>120°C) or too low, usually take heat preservation or heat insulation measures for the sensor part of the rotameter. In order to ensure the ambient temperature of the signal converter ------ the indicator works normally, a high temperature indicator should be selected. 3. For some measured media that need to be kept warm or cooled, a jacketed rotameter should be selected. The heat tracing or cooling interface of the standard metal tube rotor flowmeter adopts DIN2501 DN15 PN1.6 flange connection. If other flange or threaded connection is required, please specify when ordering. 4. For the unstable pressure of the inlet medium of the rotor flowmeter, especially for gas measurement, in order to ensure the accuracy and service life, a damping structure should be selected. 5. The pressure level required by the medium is higher. When the pressure level exceeds the standard pressure level, please select the high-pressure type structure when selecting the type. The high-pressure type adopts HG20595-97 RF neck butt welding steel pipe flange. If other standards are used, please specify when ordering. 6. When installing the rotameter, ensure that the verticality of the measuring tube is better than 5%, and a bypass should be installed to facilitate maintenance and cleaning without affecting production. 7. The location where the rotor flowmeter is installed should ensure that the inlet has≥5DN straight pipe section, the outlet is not≤250mm straight pipe section; if the medium contains ferromagnetic substances, a magnetic filter should be installed in front of the rotameter. 8. The control valve in the measurement and control system should be installed downstream of the rotameter. When used for gas measurement, the working pressure should be ensured not less than 5 times the pressure loss of the rotameter, so that the rotameter can work stably. 9. Before installing the metal pipe float rotameter, the welding slag in the pipeline should be purged; during installation, take out the stopper element in the rotameter; when using it after installation, slowly open the control valve to avoid impact damage to the rotor flow count. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Key Points for Selection of Rotameter Meters'

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