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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 installed horizontally. The inner diameter of the flow meter should correspond to the inner diameter of the pipeline. The wear-resistant flange bolts should be tightened completely to prevent d
2. What are the 5 lines of the air flow meter?
The five wires of the air flow meter: two are intake temperature wires: one is a live wire, one is a signal wire, and the other three are a live wire, one is a ground wire, and one is a signal wire.. An air flow meter is a device that converts the amount of air drawn in into an electrical signal. The advantages of an air flow meter are minimal pressure loss and a wide range of measurable flow rates. The ratio of the maximum flow rate to the minimum flow rate of an air flow meter is generally above 20:1, and it is suitable for a wide range of industrial pipe diameters, up to 3m. The output signal is linear with the measured flow rate, with high accuracy, and can measure the fluid flow rate of acid, alkali, salt solutions, water, sewage, corrosive liquids, as well as mud and slurry with conductivity ≥ 1 μ s/cm. But air flow meters cannot measure the flow of gas, steam, and purified water. Additional information: Classification of principles of air flow meters Blade type air flow meters The structure of air flow meters is simple and highly reliable; However, the intake resistance is high, the response is slow, and the volume is large. The so-called Kar
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