High range ratio differential pressure flow device composed of a multi parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter, and pressure transmitter) for differential pressure orifice flowmeter, which can measure the flow of gas, steam, liquid, and natural gas. It is widely used in process control and measurement in the fields of petroleum, chemical, metallurgy, power, heating, water supply, etc.

Manufacturer of differential pressure orifice flowmeter

Differential pressure flow meters are widely used in industrial production, and their throttling devices are usually installed on process pipelines, forming a flow measurement system that includes pressure pipes and differential pressure transmitters. This system calculates flow by measuring differential pressure and has the characteristics of simple structure and easy maintenance.

Composition of differential pressure flowmeter

Differential pressure (also known as throttling) flowmeter, whose working principle is based on the throttling characteristics of fluid flow. When the fluid passes through a specially designed throttling device, a pressure difference between the front and rear is generated, which is used for flow measurement. This flowmeter usually consists of three parts: throttling elements (such as orifice plates, nozzles, etc., which can convert fluid flow into differential pressure signals), differential pressure gauges or transmitters, and display instruments.

This type of flowmeter has a wide range of applications in various industrial fields such as chemical engineering and refining, and has accumulated rich practical experience and complete experimental data through long-term use. For common standard throttling devices such as orifice plates and nozzles, corresponding standards have been developed both domestically and internationally, allowing for direct manufacturing and use based on calculation results without the need for separate experimental calibration. However, for non-standard special throttling devices, individual calibration is required when put into use.

Regulations on the use conditions of differential pressure flowmeter

Firstly, the measured medium must flow continuously and fill the cross-section of the pipeline. Secondly, the flow inside the pipeline should remain stable. In addition, the medium should not undergo a phase change when passing through the orifice plate, for example, the liquid should not evaporate, gases dissolved in the liquid should not be released, and the medium should exist in a single-phase state. For media with complex components, it is only applicable when their properties are similar to those of a single component medium. In addition, condensation or dust generated when measuring gas (steam) flow rate, as well as gas or sediment generated when measuring liquid flow rate, must not accumulate near the orifice plate or in the connecting pipe. At the same time, it is necessary to regularly clean the medium flow that may cause blockage of the orifice plate. Finally, the inner surface of the pipeline within the 2D range of the front and rear end faces of the orifice plate should be smooth, without protrusions or visible roughness and unevenness. These conditions also apply to standard nozzles, standard Venturi nozzles, and standard Venturi tubes.

Orifice plates are widely used due to their simple manufacturing process, convenient installation, and low cost. But special caution should be taken when using, especially for flow measurement of corrosive media and media containing dust. Measurement results should be regularly observed to ensure accuracy and prevent excessive measurement errors or inability to measure due to corrosion and blockage of the pressure tap. During annual major maintenance, the orifice plate should be cleaned, and if severe corrosion is found, a new orifice plate should be replaced immediately.
Transmitters are essential detection equipment in industrial processes, mainly used to measure and transform various parameters such as flow rate, liquid level, pressure, and density. Among them, differential pressure transmitters have attracted much attention due to their wide range of applications. Capacitive transmitters, with their unique conversion components, convert pressure parameters into changes in capacitance, thereby achieving accurate detection and transmission of pressure or differential pressure signals. It can output a standard signal of 4-20mA DC， And with its high precision, compact size, excellent performance, high reliability, and long-term stability, as well as convenient adjustment functions, it has won widespread praise. Usually, its accuracy level can reach 0.25, meeting various complex industrial measurement requirements.