How is the accuracy level of Xiamen flowmeter | clamp type ultrasonic flowmeter classified?

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1. Principle of Mass Flow Meter

Mass flow meters include direct mass flow meters and indirect mass flow meters. Indirect mass flow meters are flow meters that measure mass flow by combining ordinary volumetric flow meters with density meters. Direct mass flow meters can directly measure the mass flow of fluids, mainly including Coriolis mass flow meters and thermal gas mass flow meters. Xiamen Hongkong Instrument specifically introduces the working principles of these two direct mass flow meters. The working principle of Coriolis mass flowmeter HK-CMF series Coriolis mass flowmeter is the most accurate and repeatable product among flow meters. It uses advanced Coriolis force sensors and can directly measure mass flow rate, medium ridge density, and temperature with a single Coriolis force mass flowmeter, allowing users to have a more direct understanding of the fluid operation process. The HK-CMF series mass flowmeter consists of two units: the mass flowmeter sensor and the mass flowmeter associated electronic unit (i.e. transmitter). The flow sensor consists of the main components such as the housing, micro vibration measuring tube, vibration driver, signal detector, and temperature compensation element. When the fluid passes through the vibration measuring tube, under the action of the fluid pushing and the vibration force applied to the measuring tube, the measuring tube will obtain additional Coriolis force, which is proportional to the mass flow rate of the fluid. The phase difference caused by the micro twist of the measuring tube caused by the Coriolis force during vibration can be converted into a linear electrical signal output to obtain the indication of mass flow rate. The electronic unit (i.e. tran

smitter) associated with the mass flow meter adopts a disk mounted structure and integrates the signal converter and flow digital display into one. Simplify the overall structure of the instrument, making wiring and use very convenient. The electronic unit can output standard current signals of 4-20mA and frequency signals of 0-10KHz, and also has 485 communication signals. A mass flow meter measurement system is composed of a sensor and a branch infiltration sleeve, which completes the signal processing and output of mass flow rate. It also has functions such as multi parameter digital display, configuration, communication, and query. It can display instantaneous mass flow rate Qm, cumulative mass total M, density ρ, temperature T; for mixed fluids, such as oil-water mixtures, it can display oil-water ratio Rm (mass flow rate ratio or volume flow rate ratio). The working principle of a thermal gas mass flowmeter is based on the principle of thermal diffusion, and the instrument uses the constant temperature difference method to accurately measure gases. It has the advantages of small size, high degree of digitization, easy installation, and accurate measurement. The sensor part consists of two reference level platinum resistance temperature sensors. When the instrument is working, one sensor continuously measures the medium temperature T1; the other sensor self heats up to a temperature higher than the medium temperature T2 and is used to sense fluid flow velocity, known as a velocity sensor. The temperature Δ T=T2-T1, T2>T1. When a fluid flows through, the gas molecules collide with the sensor and take away the heat of T2, causing the temperature of T2 to decrease. To keep Δ T constant, the power supply current of T2 n

How is the accuracy level of Xiamen flowmeter | clamp type ultrasonic flowmeter classified?

1. Principle of Mass Flow Meter

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