A pipeline thermal mass flow meter is an instrument that uses the principle of thermal diffusion to measure the flow rate of gases. The sensor consists of two reference thermal resistance ds (RTDs). One is the speed sensor RH and the other is the temperature sensor RMG which measures the temperature change of the gas. When these two RTDs are placed in the gas to be measured, the sensor RH is heated and the other sensor RMG is used to sense the temperature of the gas being measured. As the gas velocity increases, the air flow takes away more heat and the temperature of the sensor RH drops. Pipeline thermal gas mass flow meter is widely used in gas metering in mineral oil, chemical industry, metallurgy, sewage, electric power, wind power, power generation, metal, and other industries, and accurately measures the instantaneous flow and cumulative flow of the medium within the flow range. It is not affected by the temperature, pressure and viscosity of the measured medium, so it is not easy to block, not easy to stuck, not easy to scale, high temperature resistance, high pressure resistance, high safety and explosion-proof level, and can be used in special working conditions. Thermal mass flow meters have no moving parts inside, and they have been widely used for their stability, precision and long service life.
Pipeline thermal gas mass flow meter is an instrument that uses the principle of heat conduction to measure the flow rate of fluids, and the instrument uses the thermostatic difference method to accurately measure the mass flow of gas. Thermal mass flow meter has the advantages of small size, high degree of digitization, easy installation and accurate measurement.
1. Advantages of pipeline thermal gas mass flow meter:
High precision: Measurement based on the principle of heat conduction can achieve high measurement accuracy, especially suitable for industrial applications with high flow requirements, such as chemical, pharmaceutical and food processing. 123
Wide measuring range: suitable for a wide range of gases, including combustible gases, inert gases and corrosive gases, suitable for different industrial environments. 12
Fast response: The sensor reacts quickly to changes in gas flow, improving productivity and safety.
No moving parts: simple construction, durable and low maintenance. 2
Easy installation and maintenance: If the site conditions allow, it can achieve non-stop installation and maintenance. 4
2. Disadvantages of pipeline thermal gas mass flow meter products:
High pressure loss: Due to the limitations of the measuring principle, a certain pressure loss can occur, which can be problematic for applications that are sensitive to flow resistance. 1
Affected by gas properties: Very sensitive to the thermal conductivity and properties of gases, calibration or adjustment may be required when measuring gases with different properties. 25
Limitation of smaller flows: Performance in the low flow range may be limited, and a weaker heat transfer may lead to measurement instability.
Higher cost: Thermal-mass flow meters typically have a higher cost than other types of flow meters and may be a consideration in budget-constrained applications.
Environmental impacts: Temperature and humidity changes in the external environment may affect performance and require additional measures.
Low sensitivity: Responds to temperature changes in fluids and is not as sensitive as some other flow meters. 3
Susceptible to factors such as fluid density and temperature: Calibration and correction are required to ensure accurate and reliable measurement results.
Restriction on pulsating flow and liquid use: Restriction on use of pulsating flow and viscous liquids will be limited. 46
Easy to block: If the measured gas deposits a scale layer on the pipe wall, it will affect the measured value, and it has the disadvantage of easy clogging.