Precautions for the use of metal tube rotor flowmeters

Abstract: The information on the precautions for the use of metal tube rotor flowmeters is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Precautions for the use of metal tube rotameter 1. Installation direction of the instrument There are two installation directions: horizontal installation and vertical installation. Horizontal installation is divided into left in and out, right in and out. Vertical installation is divided into top in and bottom out, bottom in and top out. 2. It is used for the installation of dirty fluids. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on the use of metal tube rotor flowmeters. Precautions for the use of metal tube rotor flowmeter 1. Installation direction of the instrument There are two installation directions: horizontal installation and vertical installation. Horizontal installation is divided into left in and out, right in and out. Vertical installation is divided into top in and bottom out, bottom in and top out. 2. For the installation of dirty fluid, a filter should be installed upstream of the instrument. When the metal tube rotameter with magnetic coupling is used for fluids that may contain magnetic impurities, a magnetic filter should be installed in front of the meter. To keep the float and conical tube clean, especially for small-diameter instruments, the cleanliness of the float obviously affects the measured value. 3. The pulsation of the installation flow itself, if there is a reciprocating pump or regulating valve upstream of the position where the instrument is to be installed, or there is a large load change in the 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, such as 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. Installation to expand the range. If the flow range required for measurement is wide and the range exceeds 10, you can put two floats of different shapes and weights in one meter. When the flow is small, take the light float for reading, and after the float reaches the top Take the heavy float reading, the range can be expanded to 50-100. 5. To drain the liquid, use an angle metal float flowmeter whose gas inlet and outlet are not in a straight line. When using it for liquid, pay attention to whether there is any residue in the casing of the extension of the displacement of the external float. The air must be exhausted; if the liquid contains tiny bubbles that are easy to accumulate in the casing when flowing, it should be exhausted regularly. This is more important for small-diameter instruments, otherwise the flow indication will be affected significantly. 6. Necessary conversion of flow value. Unless the instrument is specially customized to the manufacturer according to the medium parameters such as density and viscosity, the flow rate of the liquid instrument is usually calibrated with water, and the gas instrument 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. 7. Verification and calibration of rotameter flowmeter The standard table method, volume method and weighing method are commonly used for the calibration and calibration of rotameter flowmeter; the bell jar method is commonly used for gas, and the soap film method is used for small flow. The bulk products of some foreign manufacturers have been calibrated by dry method, that is, by controlling the size of the tapered tube and the weight of the float, and indirectly determining the flow value to reduce the cost, and only the high-precision instrument is calibrated by the actual flow. There are also some domestic manufacturers that strictly control the inner diameter and taper of the conical tube and the size of the float at the starting point. The gauges, conical tubes and floats produced by such manufacturers are already interchangeable and do not require complete replacement. It is a high-efficiency method to calibrate the rotameter using the standard table method. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Precautions for the use of metal tube rotor flow meters'

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