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『Types of air flow meters』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 mass flow meters?
2. What are the types of air flow meters?
The types of air flow meters include: wing plate air flow meter, vortex air flow meter, hot wire air flow meter, hot film air flow meter, and Karman vortex air flow meter.. 1. Wing type air flow meter: This type of air flow meter measures air flow through one or more movable wing plates. When the airflow passes through, the wing plate will be displaced by the force, and this displacement is proportional to the air flow rate. By measuring the displacement of the wing plate, the size of the air flow can be determined. 2. Eddy current air flow meter: This type of flow meter mainly uses eddy current technology to measure air flow. When air flows through a vortex flowmeter, a series of ordered vortices are generated in the pipeline. There is a certain relationship between the frequency of vortices and the air flow rate. By measuring the vortex frequency, the air flow rate can be calculated. 3. Hot wire air flowmeter and hot film air flowmeter: Both types of flowmeters use thermal principles. The hot wire air flow meter measures the air flow rate by installing a heated thin metal wire inside the pipeline. When the air flows through the metal wire, the heat dissipation of the wire changes, and the air flow rate can be calculated by detecting the temperature change of the wire. The hot film air flow meter uses a heated thin film to detect air flow, and its principle is similar to that of a hot wire type. 4. Karman vortex air flow meter: This type of flow meter works using the Karman vortex principle. When air flows through a specific pipeline, a series of regular vortices are generated inside the pipeline. By detecting th
3. What are the commonly used air flow meters?
1、 The blade type air flow meter has a simple structure and high reliability; However, the intake resistance is high, the response is slow, and the volume is large. The Karman vortex air flow meter uses airflow to bypass a conical object, generating two columns of vortices downstream. The vortex frequency is a function of the intake flow rate, and an instrument that determines the air flow rate by detecting the vortex frequency through optical or ultrasonic methods.
3、 During the process of generating Karman vortices in an optical Karman vortex air flowmeter, the air pressure on both sides of the vortex generator will change, and it will act on the metal foil through the guide hole, causing it to vibrate. When the light from the light-emitting diode shines on the vibrating metal foil, the reflected light on the metal foil received by the photosensitive transistor is modulated by the vortex, and its output is demodulated to obtain a frequency signal representing the air flow rate.
4、 The hot film air flow meter adopts an isothermal hot wire method. The hot film type does not use white gold wire as the hot wire, but instead uses thick film technology to make the hot wire resistor, compensating resistor, and bridge resistor on the same ceramic substrate of Changqiandou. Attention should be paid to the correct installation of the air flow meter when using it. It should meet the requirements of the straight pipeline of the flow meter as much as possible and be