Selection of mixed gas flowmeter | Vortex flowmeter requires parameters to be provided | Ningxia ultrasonic flowmeter manufacturer

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How does a mass flow controller measure the flow rate of a mixed gas?

The mass flowmeter adopts a thermal measurement method, which measures the flow rate by the amount of heat carried away by the separated molecules. Because it uses a thermal measurement method, the measurement results will not be affected by changes in gas temperature and pressure.. When gas flows through the heating element, it takes away heat, and the amount of heat taken away is proportional to the flow rate and density of the gas. In order to maintain a fixed temperature difference between the two temperature sensors, the circuit needs to provide more power to the heating element. The output power of the circuit is related to the mass of the fluid, and the flow rate is measured accordingly. This method is commonly used in Japanese engines. Another commonly used method for measuring intake air volume in engines is the velocity density method, which is widely used by European and American engine manufacturers.

2. Parameters required for selection of vortex flowmeter

The parameters required for selection of vortex flowmeter are as follows: the name and type of the measured medium should be clearly stated in the measured medium information.

. If the medium is a mixed gas, the volume percentages of each component must be provided, such as the mixing ratio of oxygen and nitrogen, to ensure the adaptability of the flowmeter to the characteristics of the medium. Working pressure: The pressure value of the medium under normal operating conditions. Maximum and minimum pressure: the limit values of medium pressure fluctuations, used to evaluate the pressure resistance range and stability of flow meters. For example, if the p Mixed gas flowmeter

ressure fluctuation range of the medium is 0.5-1.5 MPa, it is necessary to ensure that the flow meter range covers this range. Medium temperature parameter working temperature: the temperature value of the medium under normal operating conditions. Maximum operating temperature: The highest temperature that the medium may reach, taking into account the impact of extreme operating conditions on the flowmeter sensor and materials. For example, high-temperature steam requires the selection of high-temperature resistant vortex flowmeter. Maximum flow rate range of medium: The flow rate value of the medium under peak operating conditions determines the upper limit of the flowmeter range. Common flow rate: The flow rate value of the medium under normal operating conditions, which is randomly used to optimize the linear measurement range of the flowmeter. Minimum flow rate: The flow rate value of the medium under low load conditions, ensuring that the flowmeter can maintain accuracy at low flow rates. For example, if the commonly used flow rate is 50m3/h, it is necessary to avoid selecting a model with a large range that may cause measurement errors. Pipeline conditions and pipeline size: The inner and outer diameters of the pipeline need to be provided to ensure that the flowmeter matches the physical dimensions of the pipeline. Pipeline materials, such as carbon steel, stainless steel, PVC, etc., affect the installation method and compatibility of flow meters. Form of flow obstruction: It is necessary to indicate whether there are contraction pipes, expansion pipes, elbows (single elbows, same plane/different plane double elbows), valves, T-shaped branch pipes, etc. in the pipeline. These structures will affect the fluid state

Selection of mixed gas flowmeter | Vortex flowmeter requires parameters to be provided

How does a mass flow controller measure the flow rate of a mixed gas?

2. Parameters required for selection of vortex flowmeter

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