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technical article
Metal tube float flowmeter to keep the small diameter of the float and cone tube clean
2012-4-16 16:06:35


必须垂直安装在无振动的管道上,不应有明显的倾斜,流体自下而上流过仪表。 The metal tube float flowmeter must be installed vertically on a non-vibrating pipe, there should be no obvious tilt, and the fluid flows through the meter from bottom to top. The angle between the center line and the plumb line of the float flowmeter generally does not exceed 5 degrees. If θ = 12 °, there will be 1% additional error. There is no strict requirement for the length of the upstream straight pipe section, but there are also manufacturers that require (2-5) D length, which is actually not necessary. 2 For the installation of dirty fluid, a filter should be installed upstream of the instrument. When a magnetically coupled metal tube float flowmeter 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 cone tube clean, especially for small-caliber instruments, the cleanliness of the float significantly affects the measured value. 3 Installation of pulsating flow The pulsation of the flow itself, if there is a reciprocating pump or regulating valve upstream of the proposed instrument position, or there is a large load change downstream, etc., the measurement position should be changed or the pipeline system should be remedied and improved, such as installing a buffer tank; If the instrument itself oscillates, for example, the gas pressure is too low during measurement, the upstream valve of the instrument is not fully opened, and the regulating valve is not installed downstream of the instrument, etc., it should be improved by targeted measures, or the instrument with damping device 4 should be used to expand the scope. If the measurement requires a wide range of flow, when the range exceeds 10, you can put two floats of different shapes and weights in one meter, take a light float reading at a small flow, and take a heavy float reading after the float reaches the top. The degree can be expanded to 50-100. 5To exhaust the gas in the instrument, the angle type metal float flowmeter with the inlet and outlet not in a straight line, when the liquid is used to pay attention to whether there is residual air in the extension sleeve of the externally transmitted float, it must be exhausted; It is easy to accumulate in the casing and should be vented regularly. This is more important for small-caliber instruments, otherwise it will significantly affect the flow indication.

流量值做必要换算、若非按使用密度、粘度等介质参数向制造厂专门定制的仪表,液体用仪表通常以水标定流量,气体仪表用空气标定,定值在工程标准状态。 6 The flow value of the metal tube float flow meter is necessary to be converted. If it is not a customized instrument to the manufacturer according to the medium parameters such as the use density and viscosity, the liquid meter is usually calibrated with water and the gas meter is calibrated with air. The 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 conversion must be done. Conversion formulas and methods are detailed in each manufacturer's instruction manual.

的校验和标定、浮子流量计的校验和标定液体常用标准表法、容积法和称量法;气体常用钟罩法,小流量用皂膜法。 7 metal tube float flowmeter calibration and calibration, float flowmeter calibration and calibration liquid commonly used standard table method, volume method and weighing method; gas commonly used bell cover method, small flow using soap film method. The bulk products of some foreign manufacturers have achieved dry calibration, that is, controlling the size of the conical tube and the weight of the float, and indirectly determining the flow value to reduce costs. Only high-precision instruments are calibrated by solid flow. There are also some domestic manufacturers that strictly control the inner diameter and taper of the starting point of the conical tube and the size of the float. The actual flow verification only serves to check the quality of the inner surface of the conical tube. Gauges, tapered tubes and floats from these manufacturers have been interchanged and do not need to be replaced in sets. The float meter is calibrated with a standard meter method, which is a high-efficiency method.