Abstract: Rotameter installation and maintenance information is provided by excellent
flowmeter and flowmeter manufacturers and quotation manufacturers. Dahua Instrument Rotameter installation and maintenance (1) Rotameter installation and use 1. Instrument installation direction. Most rotameters must be installed vertically on a vibration-free pipeline without obvious inclination, and the fluid flows through the meter from bottom to top. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the installation and maintenance of the rotor flowmeter. Dahua Instrument Rotameter installation and maintenance (1) Rotameter installation and use 1. Instrument installation direction. Most rotameters must be installed vertically on a vibration-free pipeline without obvious inclination, and the fluid flows through the meter from bottom to top. The angle between the center line of the rotameter and the plumb line is generally not more than 5°, high-precision (1.5 or above) instrumentθ≤20°. ifθ=12°An additional error of 1% will occur. The instrument does not have strict requirements on the length of the upstream straight pipe section, but there are also manufacturers that require (2 to 5) D lengths, which are actually not necessary. 2. Press-fit for dirty fluids. A filter should be installed upstream of the meter. When the metal tube rotameter with magnetic coupling is used for fluids that may contain ferromagnetic impurities, a magnetic filter should be installed in front of the meter. To keep the float and conical pipe clean, especially for small-diameter instruments, the cleanliness of the float will obviously affect the measured value. If necessary, the piping can be flushed and flushed regularly. 3. Installation of pulsating flow. For the pulsation of the flow itself, such as reciprocating pump or regulating valve upstream of the position where the instrument is to be installed, or a large load change downstream, etc., the measurement position should be changed or the pipeline system should be remedied and improved, such as adding a buffer tank; if the instrument itself oscillates If the gas pressure is too low during measurement, the upstream valve of the instrument is not fully opened, the regulating valve is not installed downstream of the instrument, etc., it should be improved and overcome, or an instrument with a damping device should be used instead. 4. Expand the range of installation. If the flow range required for measurement is wide, and the range exceeds 10, more than two glass tube float flowmeters with different flow ranges are often used in parallel, and one or more meters are connected in series according to the measurement. The indicated value of the flow range meter, read the indicated value of the large
flow meter when the flow is large, the series method is simpler to operate than the parallel method, and there is no need to frequently open and close the valve, but the pressure loss is large. You can also put two floats of different shapes and weights in one meter. When the flow rate is small, take the light float reading, and take the heavy float reading after the float reaches the top. The range can be expanded to 50-100. 5. To drain the liquid use gas in the instrument. The angle type metal rotameter whose inlet and outlet are not in a straight line should be used for liquids. Pay attention to whether there is any residual air in the casing, which is the extension of the displacement of the external float. It must be exhausted. gas. This is more important for small-diameter instruments, otherwise the flow indication will be affected significantly. 6. Make the necessary conversion for the flow value. Unless the meter is specially customized to the manufacturer according to the medium parameters such as density and viscosity, the flow rate of the liquid meter is usually calibrated with water, and the gas meter is calibrated with air, and the fixed value is in the engineering standard state. When the fluid density, gas pressure and temperature of the operating conditions are inconsistent with the calibration, necessary conversions must be made. The conversion formulas and methods are detailed in each manufacturer's instruction manual. (2) Routine maintenance of the rotor flowmeter 1. Check whether the meter indication and power supply are normal on a daily basis, and check whether the meter body (connecting pipelines, lines) is leaking, damaged or corroded. 2. Perform instrument cleaning once a week. 3. The zero point and 100% value can be set by the internal buttons. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Installation and Maintenance of Rotameter Meters'
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