Types of flow measurement devices | What brand is ProMinent, ProMinent metering pumps

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As early as 1738, Swiss man Daniel I. Bernoulli used the Bernoulli equation as a basis to measure water flow using differential pressure method; Later on, the Italian researcher used a Venturi tube to measure flow and published the research results in 1791; In 1886, the American Herschel made a practical device for measuring water flow using a Venturi tube. In the early to mid-20th century, the existing measurement principles gradually matured, and people began to explore new measurement principles. Since 1910, the United States has been developing trough flow meters for measuring water flow in open ditches. In 1922, Pasher transformed the original Churi sink into the Pasher sink. In 1911-1912, Hungarian American Carmen proposed a new theory of the Karman vortex street; In the 1930s, methods for measuring the flow velocity of liquids and gases using sound waves emerged, but there was not much progress until World War II. It was not until 1955 that the Maxson flowmeter, which applied the acoustic circulation method, was used to measure the flow rate of aviation fuel. In 1945, Colin successfully measured blood flow using an alternating magnetic field sock. After the 1960s, measuring instruments began to develop towards precision and miniaturization. For example, in order to improve the accuracy of differential pressure instruments, force balance differential pressure transmitters and capacitive differential pressure transmitters have emerged; In order to miniaturize the sensor of electromagnetic flow meters and improve the signal-to-noise ratio, electromagnetic flow meters using non-uniform magnetic fields and low-frequency excitation methods have emerged. In addition, practical Karman vortex flowmeters with a wide measurement range and no active detection components were also introduced in the 1970s. With the rapid development of integrated circuit technology, ultrasonic (wave) flowmeters with phase-locked loop technology have also been widely used. The widespread application of microcomputers has further improved the ability of flow measurement, such as the application of microcomputers in laser Doppler velocimeters, which can process complex signals. Flow can be indirectly measured using various physical phenomena, so there are many types of flow measurement instruments. According to measurement methods, flow meters can be classified into differential pressure, variable area, volumetric, velocity, and electromagnetic types.

2. English for Energy Measurement

Guides for providing and managing of the measuring instruments of energy in enterprise Guidelines for the Equipping and Management of Energy Measuring Instruments in Enterprises Article 22 energy - using units shall improve their quantitative management in respect of energy , and estabpsh a sound system of energy consumption statistics and of energy utipzation *** ysis Article 22 Energy consuming units shall strengthen energy measurement management, improve energy consumption statistics and energy utilization analysis systems. The major pillars supporting this success include highly efficient illumination , pressed - air systems , new designs for heating and air conditioning , funnepng heat losses from pressors into heating buildings , and detailed energy measurement and bilpng The main reasons for success include high-efficiency lighting equipment, air compression systems, newly designed heating and air conditioning, reducing heat loss when entering bu

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