『Air flow meter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
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 kind of flowmeter is good for measuring compressed air
There are many instruments that can be used to measure air, but there are not many types of air flow meters actually used on site according to their working principles.
. The most important ones are rotor flow meters, throttling differential pressure flow meters, vortex flow meters, and averaging tube flow meters.1、 When measuring compressed air, flow meters are usually installed in the compressor room and blower room. However, vibrations generated by compressors or blowers can be transmitted to distant vibrations through air ducts or ducts. This vibration can cause the vortex flow sensor to generate interference signals corresponding to the vibration frequency, disrupting the cavity mode and resulting in significantly higher and slower flow readings.
2、 Compressed air is taken from the atmosphere, which always contains water vapor. For orifice flow meters that measure the flow rate of compressed air with larger diameters, there is often water accumulation in front of the orifice plate, which can affect the measurement accuracy. In addition, there is often a section of water accumulation in the pressure pipe, which causes
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