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『Principle of Thermal Gas Flow Meter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. What are the types of thermal gas flow meters?
Thermal gas flow meters are mainly divided into four categories based on measurement principles and installation forms, which can meet the needs of different industrial scenarios.. 1. The thermal distributed gas flowmeter adopts the principle of thermal conduction, and two temperature sensors are installed inside the pipeline: one measures the gas temperature, and the other generates a temperature difference through heating. The larger the gas flow rate, the smaller the temperature difference, thus calculating the flow rate value. Its advantages lie in its simple structure and low cost, but it should be noted that gas composition or temperature and pressure changes may affect measurement accuracy, making it more suitable for working conditions with stable composition. 2. Immersion thermal mass flowmeter sensors are directly inserted into the flowing gas to obtain flow data by measuring the rate at which the gas carries away heat. This type of equipment has industrial grade high precision, with a response time usually less than 1 second, and is particularly suitable for real-time monitoring of large-diameter pipelines, such as process gas flow control in chemical plants. When installing plug-in gas flow meters, there is no need to cut off the pipeline, and the installation is completed through flange components with probes. The probe is equipped with heating elements and temperature measurement modules, which have extremely low requirements for existing pipeline modifications and are easy to install and maintain online. This type of equipment is widely used in fields such as natural gas transmission and distribution, sewage treatment aeration systems, etc.<
4. Thermal dissipation mass flow meters convert flow values by precisely controlling heating power and monitoring the degree of heat loss, with the core advantage being a repeatability error of less than ± 0.5%.
. The temperature compensation algorithm equipped with this type of instrument can effectively overcome environmental interference, and is commonly used in high-precision scenarios such as laboratory gas analysis and special gas measurement in the semiconductor industry.2. Difference between hot gas and vortex gas
What you mentioned may be "hot gas" and "vortex gas", which is more like the technical principle distinction between the two types of flow meters, rather than the type of gas.
. Thermal gas flowmeter uses the principle of thermal diffusion to measure the flow rate by measuring the rate at which the fluid carries away heat; The vortex flowmeter is based on the Karman vortex effect and calculates the flow rate by detecting the frequency of vortex generation in the fluid. The core of a thermal gas flowmeter is the principle of thermal diffusion. It usually has two sensors: one for heating and one for temperature measurement. When gas flows through, it carries away heat, causing temperature changes. By measuring this temperature difference or the energy required to maintain a constant temperature, the mass flow rate of the gas can be calculated. Its advantage lies in directly measuring mass flow without the need for temperature and pressure compensation, especially adept at measuring low flow rate gases. It has no moving parts inside, high reliability, and minimal pressure loss. But its disadvantage is that it is sensitive to changes in the composition of the medium and has a hig