Compressed air flow meter installation precautions

Abstract: The information on the installation precautions of compressed air flow meter is provided by the excellent flow meter and flow meter manufacturer and quotation manufacturer. The use of compressed air flow meters must avoid the following disadvantages. First, the vibration is large. Not every air flow meter is installed in a high-vibration location. But the air flow meter installed in the compression plant and the blower room has to consider the vibration problem. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the details of the article on the installation precautions of compressed air flowmeters. The use of compressed air flow meters must avoid the following disadvantages. First, the vibration is large. Not every air flow meter is installed in a high-vibration location. But the air flow meter installed in the compression plant and the blower room has to consider the vibration problem. This vibration mainly comes from the compressor and blower, and the vibration of the machine can be transmitted to a long distance through the air duct or air duct. The largest vibration is the reciprocating compressor. The vibration generated during the operation of the large reciprocating compressor often drives the workshop and the surrounding ground to vibrate together, posing a threat to the accurate and reliable operation of the relevant air flow meter. It causes the pivot point of the lever differential pressure transmitter to move and cause the instrument to drift. Vibration causes the vortex flow sensor to generate an interference signal corresponding to the vibration frequency, causing the flow indication value to be significantly higher. 2. Gas with water. Compressed air flow meters are drawn from the atmosphere, which always contains a certain amount of water vapor. The content of water vapor is expressed as the partial pressure of water vapor ps. The saturated partial pressure of water vapor in the atmosphere is a function of atmospheric temperature. In rainy and foggy days, the partial pressure of water vapor in the outdoor atmosphere reaches saturation, that is, the relative humidity reaches 100%. At this time, compressing the atmosphere is like compressing a sponge that absorbs enough water. As the volume shrinks, there is a corresponding amount of water. Water comes out. This is the simple principle of compressed air so it carries water. In fine weather, the relative humidity of the atmosphere is low, but as it is compressed and the volume is reduced to a fraction of the original, the partial pressure of water vapor will increase accordingly, and it may also enter a saturated state and precipitate water droplets. For larger-diameter orifice flowmeters used to measure the flow of compressed air, there is often accumulated water in front of the orifice, which will affect the measurement accuracy. There is often a section of water in the impulse line, which causes the differential pressure measured by the differential pressure transmitter to be inconsistent with the differential pressure generated by the throttling device. These are common causes of errors caused by water in the air. In addition, due to the high content of nitrogen oxides in the urban atmosphere, the water droplets in the compressed air are acidic, causing the surface of the ring chamber to corrode and the inner wall of the pipeline to corrode, making the surface rough. When the iron oxide produced by corrosion becomes dry under certain conditions, it is easy to fall off the inner wall of the pipe and be brought to the front of the orifice by the airflow, which will also affect the flow indication value. Therefore, these powdery and lumpy garbage should be removed when the machine is stopped for maintenance. Three, pulsating flow. Most compressor and blower outlet fluids contain a certain amount of pulsation. A reciprocating compressor, for example, exhibits half-wave pulsation. Significant swings in the outlet pressure of the compressor and blower were observed on site. Among them, the pulsation frequency of the positive (fixed) displacement blower outlet is relatively high, generally tens of hertz, while the pulsation frequency of the reciprocating compressor outlet is relatively low, generally several hertz. The flow pulsation causes the differential pressure flowmeter, vortex flowmeter and other flowmeters to show high values, which causes the float in the float flowmeter to jump up and down. There are two common methods to eliminate and reduce the influence of flow pulsation on the indication value of the flowmeter. One is to set a buffer tank at the compressor outlet to filter out the pulsation, and install the flowmeter behind the buffer. In fact, the system of the reciprocating compressor is designed in this way; the second is to install the flow meter away from the pulsation source, so that the gas capacity of the process pipeline and its pipe resistance can be used to form a low-pass filter to attenuate the pulsation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Precautions for installation of compressed air flow meter'

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