Which flow meter is better for measuring tiny flow of gas or liquid?

Abstract: Which flow meter is better to use for measuring tiny flow of gas or liquid? The information is provided to you by the excellent manufacturers of flowmeters and flowmeters. The flowmeter produced by Liangbang Instrument is a well-known domestic brand flowmeter, manufactured and sold by Changzhou Liangbang Instrument Co., Ltd., a well-known domestic flowmeter manufacturer. Liangbang Instrument Factory has produced the first type of flowmeter since 2004, and it has a history of more than ten years. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is which flowmeter is better for measuring small flow of gas or liquid? Article details. The flowmeter produced is a well-known domestic brand flowmeter, which is manufactured and sold by Liangbang Instrument, a well-known domestic flowmeter manufacturer. The factory has produced the first flow meter since 2004. It has a history of more than ten years. It has been insisting on it for more than ten years.“Quality first, customer first”The factory management policy, implement the GB/T19001-2000 quality management system requirements, ensure long-term stability and continuous improvement of product quality, and provide users with high-quality products and perfect services. This time, let's talk about what type of flow meter is needed to measure the medium with small flow. There are many kinds of common flowmeters suitable for measuring tiny, such as differential pressure type, float type, volumetric type, thermal type, etc. Some of them are suitable for measuring medium and large flow, as well as small flow, while others are specially designed for measuring small flow. Designed to measure tiny flow rates. 1. The differential pressure flowmeter is composed of a standard throttling device and a differential pressure flowmeter, which is limited in three aspects in the measurement of small flow. The first limitation is the size of the pipe diameter. Standard throttling devices are available for pipe diameters of 50mm and above. If the pipe diameter is too small, the diameter of the throttling device becomes smaller accordingly, and it is difficult to carry out similar processing according to the shape specified in the standard. The second limitation is that the differential pressure is too small. This differential pressure is proportional to the square of the flow rate. When the flow rate is low to a certain value, the differential pressure becomes so small that it cannot be distinguished. The third limit is the lower limit of the Reynolds number. Different types of throttling devices have different lower limit of Reynolds number. Generally speaking, Reynolds number≥104 is the limit that can be used. The average flow velocity and flow rate corresponding to this lower limit of Reynolds number is the lower limit of measurement for small flow. If the Reynolds number is too small, the outflow coefficient will change significantly with the change of the Reynolds number, so that the uncertainty will increase. 2. Float flowmeter The rotameter is mainly composed of a float and a conical tube. The conical tube in the glass tube rotameter is a glass tube; the conical tube of the metal tube rotameter is made of metal, the fluid temperature can reach 180℃, and the fluid pressure can reach 13MPa. The rotameter is a medium and low precision instrument. The basic error of the metal rotameter is 1% to 2.5% FS for the local indication type, 1% to 4% FS for the remote type; 2.5% for the small diameter glass tube rotameter. %～5%FS. Therefore, it is generally only suitable for flow monitoring, not for accounting measurement. The glass tube rotameter is only suitable for gases and liquids with high transparency, otherwise the height of the float in the conical tube is not easy to see. The metal tube rotameter does not have this limitation. The flow measurement range of the small-diameter rotameter can be made very small, including 0.3-3L/h for water and 5-50L/h for air. Micro glass float flowmeters commonly used in atmospheric samplers, process online analysis instruments and laboratory analysis instruments, which are widely used in environmental protection, can have a smaller measurement range. In the measurement of liquid level, flow and density in industrial processes, if the measured medium has a high viscosity or is corrosive. The method of air blowing or liquid blowing is commonly used for isolation, and the flow rate of air blowing and liquid blowing is usually measured by rotameter. In the case where the pressure of the gas (liquid) source fluctuates greatly or the pressure of the measured medium fluctuates greatly, in order to measure the flow of air blowing and liquid blowing stably and accurately, some products combine the float flowmeter with the regulator (constant current device). ) into a set of constant differential pressure flow regulator. The development of the instrumentation industry and technological breakthroughs in the instrumentation industry are inseparable from the support and efforts of various instrumentation manufacturers. As a flow meter manufacturer, our company strives to learn new technologies from others, introduce advanced equipment, and develop more technologies to meet the needs of more customers. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Which flow meter is better for measuring small flow of gas or liquid? 》

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