Ultrasonic flowmeter is an instrument for measuring flow by detecting the effect of fluid flow on ultrasonic beam (or ultrasonic pulse). According to the principle of signal detection, ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam offset method, Doppler method, cross-correlation method, spatial filtering method and noise method.

The thermal flowmeter sensor consists of two sensing elements, a speed sensor and a temperature sensor. They automatically compensate and correct gas temperature changes. The electric heating part of the instrument heats the speed sensor to a fixed value higher than the working condition temperature, so as to form a constant temperature difference between the speed sensor and the sensor measuring the working condition temperature.

It can be considered from five aspects: flowmeter performance, fluid characteristics, installation conditions, environmental conditions and economic factors. The detailed factors of the five aspects are as follows: Instrument performance: accuracy, repeatability, linearity, range, flow range, signal output characteristics, response time, pressure loss, etc;

When the indication value of the flow control instrument system reaches the minimum, first check the on-site detection instrument. If it is normal, the fault is in the display instrument. When the indication of the field detection instrument is also the smallest, check the opening of the regulating valve. If the opening of the regulating valve is zero, it is often a fault between the regulating valve and the regulator.

Driving factors according to the prediction of the International Energy Agency (IEA), from 2007 to 2030, the world needs to invest $26.0 trillion in energy infrastructure (in 2007 dollars). Among them, the investment in the power industry is US $13.6 trillion, accounting for 52.3% of the total investment. By 2030, the infrastructure of oil, gas and electricity in many parts of the world will need to be replaced.

Traditional mechanical flowmeter, such as differential pressure flowmeter, volumetric flowmeter and variable area flowmeter, has been in the stage of popularization, with fierce price competition, decreasing profit space, less technological innovation and relatively mature market. The realization of product differentiation and customized production is an important breakthrough point for manufacturers in the fierce competition in mature markets.

Stainless steel pressure gauges​ are widely used in petroleum, chemical industry, chemical fiber, metallurgy, power station, food and other industrial departments to measure the pressure of various fluid media in the process flow with high requirements for corrosion resistance and high temperature resistance. The stainless steel pressure gauge is composed of pressure guiding system

IP protection level is composed of two numbers. The first number represents the level of dust prevention and prevention of foreign invasion; The second number indicates the tightness against moisture and water intrusion. The larger the number, the higher the protection level. The protection level represented by the two marked numbers is described as follows

Stainless steel pressure gauges are widely used in petroleum, chemical industry, chemical fiber, metallurgy, power station, food and other industrial departments to measure the pressure of various fluid media in the process flow with high requirements for corrosion resistance and high temperature resistance. The gauge adopts direct contact connector and pressure sensing element materials, icr18ni9t, ocr18ni12mo2ti and SUS316. The structure is fully sealed.

The innovation from mechanical flowmeter to electronic flowmeter is one of the most important development trends of flowmeter. Target flowmeter, electromagnetic flowmeter, ultrasonic flowmeter, vortex flowmeter and V-cone Flowmeter (orifice flowmeter) work based on electrical principle, so as to avoid the moving parts that need to be replaced in the work of mechanical flowmeter.