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Differential pressure flow meter overview introduction

The differential pressure type flowmeter (hereinafter referred to as DPF or electromagnetic flowmeter) is a meter that measures the flow rate based on the differential pressure generated by the flow detecting member installed in the pipe, the known fluid condition, and the geometrical dimensions of the detecting member and the pipe. The DPF consists of a primary device (detection) and a secondary device (differential pressure conversion and flow display instrument). The DPF is usually classified by the type of the test piece, such as an orifice flow meter, a venturi flow meter, and a constant velocity tube flow meter. The secondary device is a variety of mechanical, electronic, electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display and calculation instruments. It has developed into a series of specifications with high degree of serialization, generalization and standardization. A large class of instruments. The differential pressure gauge can be used to measure flow parameters as well as other parameters (such as pressure, level, density, etc.).
DPF can be divided into throttling type, dynamic pressure head type, hydraulic resistance type, centrifugal type, dynamic pressure gain type and jet type according to the principle of its detecting parts, including throttling and dynamic head type applications. The most extensive.
The detectors of the throttle type DPF are classified into two types according to their standardization degree: standard type and non-standard type. The so-called standard throttling device refers to the design, manufacture, installation and use according to the standard documents. It can determine the flow value and estimate the flow measurement error without real-current calibration. The non-standard throttling device is poorly mature and has not yet arrived. The test piece in the standard file.
The development of the standard throttling DPF has gone through a long process. As early as the 1920s, large-scale throttling device experiments were started in the United States and Europe. The most common throttling device in the month - orifice plates and nozzles began to standardize. One type of standard ISA 1932 nozzle for standard nozzles is now standardized in the 1930s, and the standard orifice plate was also known as the ISA 1932 orifice plate. The standardization of the structure of the throttling device has far-reaching significance. Because only the structural form of the throttling device is standardized, it is possible to bring together many international research results, which promotes the depth and breadth of the theory and practice of the test piece. This is beyond the reach of other flow meters.

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