Rotameter and throttling differential pressure flowmeter

There are many kinds of instruments that can be used to measure air flow, but there are not many types of air flowmeters actually used in the field according to their principles. The most important ones are glass rotameter, throttling differential pressure flowmeter, vortex flowmeter and average velocity tube flowmeter. ① Rotameter. Rotameters are widely used in medium and small experimental setups because they are simple, intuitive, inexpensive and suitable for general indication. There are two types of rotameters: glass conical tube type and metal conical tube type. The disadvantage of glass conical tube type is that the pressure resistance is not high and the glass conical tube is fragile. In addition, the temperature and pressure of the fluid have a great influence on the displayed value. Generally, it can be manually converted according to the actual temperature and pressure of the fluid according to the formula door ^^. In the formula due to the introduction of&, when the measured gas is not air, this formula can also be used for conversion. ② Throttle-type differential pressure flowmeter. Restrictive differential pressure flow meters have a long history in air flow measurement. Although the throttling differential pressure flowmeter has major shortcomings such as narrow range, troublesome installation and maintenance, and large pressure loss, it still has high reliability, good stability, and anti-interference ability in compressor rooms and blower rooms where vibration is obvious. Strong preferred gauge. The most important thing to measure air flow with a throttling differential pressure flowmeter is to deal with the water accumulation in front of the throttling parts, the water accumulation in the high and low pressure chamber of the transmitter, and the water accumulation in the pressure pipeline.

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