Understanding from the principle of thermal gas flowmeter, steam media can not be measured for reaso

Project Overview

　　Thermal gas flow meters measure gas flow and are based on the principle of heat transfer. Steam cannot be measured accurately due to non-conductivity, complex flow characteristics and interference from impurities. Vortex or differential pressure flowmeters can be considered for more accurate and reliable measurement of steam flow.

　　Thermal gas flowmeter is an instrument to measure gas flow using the principle of heat conduction or heat diffusion. Its working principle mainly has two kinds of constant temperature difference method and thermistor method.

　　Constant differential temperature method: The mass flow rate of the gas to be measured is derived by measuring the energy of the heater. The greater the gas flow, the greater the cooling effect and the greater the energy required to maintain the differential temperature.

　　Thermistor method: The sensor consists of two reference level resistance thermistors (RTDs), a velocity sensor, RH, and a temperature sensor, RMG, which measures the change in temperature of the gas. when these two RTDs are placed in the gas under test, the sensor, RH, is heated and the other sensor, RMG, is used to sense the temperature of the gas under test. As the gas flow rate increases, the gas stream carries away more heat and the temperature of the sensor RH decreases.

　　The reason why steam media cannot be measured by a thermal gas flow meter is mainly related to its physical properties and operating principle. Steam is usually non-conductive, and its flow characteristics are different from those of gases. In a thermal gas flow meter, the measurement of the flow rate depends on the transfer of heat from the gas. However, steam, due to its special physical state (coexistence of gas and liquid phases), can lead to unstable and inaccurate heat transfer. In addition, water droplets or impurities that may be contained in the vapour may also interfere with the measurement, further affecting its accuracy.

　　In summary, steam media cannot be measured by thermal gas flowmeters, mainly due to factors such as the non-conductivity of steam, the complexity of the flow characteristics, and the possible interference of impurities. If you need to measure the steam flow, you can consider using other types of flow meters, such as vortex flowmeter or differential pressure flowmeter. These flowmeters offer greater accuracy and reliability in measuring steam flow.