Thermal gas mass flowmeter is an instrument that uses the principle of heat conduction to measure flow

The thermal gas mass flowmeter adopts the principle of thermal diffusion. Thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing elements include two thermal resistors (platinum RTD), one is a speed sensor, One is a temperature sensor that automatically compensates for changes in gas temperature. When the two RTDs are placed in a medium, where the speed sensor is heated to a constant temperature difference above ambient temperature, the other temperature sensor is used to sense the medium temperature. The gas mass flow through the velocity sensor is calculated from the amount of heat transfer through the sensing element. As the gas velocity increases, the heat transferred from the sensor to the medium increases. The thermal gas mass flowmeter is an instrument that uses the principle of heat conduction to measure flow. The instrument uses the constant temperature difference method to accurately measure the gas mass flow. It has the advantages of small size, high degree of digitization, convenient installation and accurate measurement. The sensor section consists of two reference grade platinum resistance temperature sensors. Using a bridge loop, one sensor measures the flow temperature and the other maintains a constant temperature difference above the fluid temperature, enabling flow measurement at high temperature and pressure. According to the Kim's law of thermal effect, the thermal gas mass flowmeter has a definite mathematical relationship between heating power P, temperature difference △T (TRH-TRMG) and mass flow Q. P/△T=K1+K2f(Q)K3K1, K2, K3 are constants related to the physical properties of the gas. The temperature difference measurement method of the ZN series thermal gas mass flowmeter* overcomes the large zero point drift caused by the water, oil and impurities in the gas when the thermal gas mass flowmeter adopts the principle of constant temperature difference to measure the gas flow, which makes it impossible Disadvantages of measurement. It can also be used to measure the mass flow of wet gas, such as the real-time detection of the air volume (velocity) in the mine gas drainage, air supply, and exhaust systems. According to the installation method, thermal gas mass flowmeters are divided into: insertion type and pipe section type. Plug-in sensors can be installed and maintained online. The installation process is to first weld a base with external threads on the outer wall of the pipeline, install a 1-inch stainless steel ball valve on the base, and then use a tool to drill a hole with a diameter of 22mm in the pipeline. After the hole is completed, remove the tool and install the sensor on the Insert the sensor into the center of the pipe on the valve (the insertion position of the sensor has been determined at the factory). Plug-in sensors are generally suitable for pipe diameters: DN80~6000mm.

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