A thermal mass flow meter uses the principle of heat transfer to measure the mass flow of gases. A sensor element is heated. When gas flows past the sensor, it dissipates the heat. The electronics then regulate the heating power to maintain a constant temperature difference. The energy input required for this is directly proportional to the mass flow rate. This enables precise measurement of the gas flow without the need for additional pressure or temperature compensation. Advantages include high accuracy, repeatability and low maintenance.

• High accuracy: Thermal mass flow meters are characterised by their high precision when measuring mass flow. They can accurately measure even the smallest flow rates, making them particularly suitable for use in the medical, pharmaceutical and semiconductor manufacturing industries.
• Wide range of applications: Thermal mass flowmeters can be used with various gases and liquids. Since the measurement is based on heat transfer, thermal mass flowmeters are largely independent of pressure and temperature fluctuations in the medium. This makes them stable and reliable in environments with changing conditions.
• Easy installation: These flowmeters have no moving parts, making them low-maintenance and durable.
• They are ideal for gases. Thermal mass flow meters are particularly well-suited to gas applications, as the specific heat capacity of gases aligns well with the measurement method. They are frequently used in the process industry, environmental monitoring and gas pipeline monitoring.