What are the types of gas micro flow meters

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What are the 5 lines of an 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 Karman vortex air flow meter refers to the vortex that occurs downstream of a cylindrical or triangular object when it is placed in the fluid, with two columns of opposite rotation directions and alternating appearances. In the process of generating Karman vortex, 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 meta

l foil received by the phototransistor is modulated by the vortex, and its output is demodulated to obtain a frequency signal representing the air flow rate. The ultrasonic Karman vortex air flowmeter is equipped with ultrasonic transmission probes and reception probes on both sides of the downstream pipeline of the Karman vortex generator. Due to the influence of Karman vortices on air density, the time for ultra trapped mode sound waves to travel from the transmitting probe to the receiving probe becomes later than without vortices, resulting in a phase difference. By processing this phase signal, a vortex pulse signal can be obtained. The working principle of a hot wire air flow meter is that when there is no air flow, the bridge is in a balanced state, and the control circuit outputs a certain heating current to the hot wire resistor RH. When there is air flow in the air sensitive pants, the heat of RH is absorbed by the air and becomes cold, and its resistance value changes, causing the bridge to lose balance. If the temperature difference between the hot wire resistor and the inhaled air remains constant and constant, the current flowing through the hot wire resistor IH must be increased. Therefore, the hot wire current IH is a function of the air mass flow rate. The working principle of a hot film air flow meter is similar to that of a hot wire air flow meter, both of which operate using a Wheatstone bridge. The difference is that the hot film type does not use white gold wire as the hot wire, but instead uses thick film technology to make the bridge scale simple hot wire resistor, compensation resistor, and bridge circuit resistor on the same ceramic substrate. When air flows in the measuring tube, the target air

What are the 5 lines of an air flow meter?

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