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A thermal mass flow meter is a type of flow meter that measures the mass flow rate of a fluid by utilizing the changes in the temperature field that occur when the fluid flows through a pipe heated by an external heat source, or by using the relationship between the energy required to raise the fluid temperature by a certain amount and the mass of the fluid. It features a wide measurement range, accurate measurement, high precision, and low pressure loss. This article mainly introduces the calibration methods for thermal mass flow meters. Precautions for installing thermal gas mass flow meters: 1. Installation direction: Thermal distributed type – The flow sensors of most thermal distributed thermal gas mass flow meters can be installed in any orientation ； Immersion type: The performance of most immersion-type TMFs is not affected by the installation orientation. However, when measuring at low flow rates, the installation position becomes very important due to the influence of heat flow from gas convection within the pipeline. Therefore, to obtain accurate measurements at low or very low flow rates, it is necessary to follow the installation recommendations provided by the manufacturer based on the design of the instrument ； II. Requirements for the straight pipe sections upstream and downstream of a thermal gas mass flow meter: In the case of thermal dispersion: ① The length of the straight pipe sections upstream and downstream can be as short as 2D ； ②Installing a metal mesh at the inlet side can effectively improve the distortion in the flow velocity distribution, resulting in a more uniform airflow ； ③To prevent a sudden increase in diameter from small pipes to larger-diameter instruments, a gradual transition is necessary ； Submersible type: Submersible flow sensors with measuring tubes and insert-type instruments require a certain length of straight pipe section ahead of them; specifically, an upstream straight pipe section of (8~10)D and a downstream straight pipe section of (3~5)D are needed ； For more information, please visit the company’s official website at http://www.yb1518.com/. Please retain this link when reproducing the content! http://www.yb1518.com/UploadFiles/201511391437413.jpg