Application of thermal mass flowmeter in chemical industry

The thermal gas mass flowmeter is dedicated to the measurement of a single component gas or a fixed proportion of mixed gas. It has been widely used in petroleum, chemical, semiconductor, medical equipment, biological engineering, combustion control, gas distribution, environmental monitoring, precision instruments, Research, measurement, food, metallurgy, aerospace and other fields. Thermal mass flowmeter is used for precise measurement and automatic control of gas mass flow. The use of standard input and output signals enables centralized computer control. In Daqing Petrochemical Company, there are many types of applications, such as the polypropylene device hydrogen flow meter FT-121A/B uses a BROOKS calorimeter, the measuring range is 1.45Kg/H and 9.5Kg/H. Compared with the traditional flowmeter, it does not need to be equipped with temperature and pressure transmitters, and can directly measure the mass flow rate without performing temperature and pressure compensation (in the standard state, 0℃, 101.325KPa). When the gas is used as the control variable in the production process (such as combustion, chemical reaction, ventilation and exhaust, product drying, etc.), the mass flow controller can be used to directly measure the number of moles of the gas. If you want to maintain a quantitative gas mixture as a mixture or ingredient, or to optimize the chemical reaction process, so far there is no better technology than using a mass flow controller. The mass flow controller is continuously adjustable to control the flow, and the cumulative flow can also be obtained through the display. Thermal mass flowmeter is also a good instrument for the leak detection of pipeline systems and valves. It directly displays the amount of air leakage. The mass flow meter has a high price-performance ratio, is easy to install, and is easy to operate. Using mass flow meters and mass flow controller products is one of the most reasonable choices. Because the sensor of this type of mass flow meter is a thermal principle, if the gas is not a dry gas, it will affect the heat transfer efficiency, thereby affecting the output signal and measurement accuracy of the sensor