How to measure compressed air flow

Abstract: How to measure the compressed air flow meter information is provided by the excellent flow meter and flow meter production and quotation manufacturers. Compressed air, that is, air compressed by an external force. Air is compressible, and the air after the air compressor does mechanical work to reduce its volume and increase its pressure is called compressed air. Compressed air is an important power source. Compared with other energy sources, it has. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of how to measure the compressed air flowmeter. Compressed air, that is, air compressed by an external force. Air is compressible, and the air after the air compressor does mechanical work to reduce its volume and increase its pressure is called compressed air. Compressed air is an important power source. Compared with other energy sources, it has the following obvious characteristics: clear and transparent, easy to transport, no special harmful properties, no fire danger, not afraid of overload, can work in many unfavorable environments, air is everywhere on the ground, take it Endless. Huaian Runtai Instrument 1. Working principle and characteristics of vortex flowmeter Vortex flowmeter is a kind of flowmeter with international advanced level based on the principle of Karman vortex flow. Since the 1970s, it has developed rapidly. According to relevant data, the proportion of vortex flowmeters used in Japan, Europe and the United States and other developed countries has increased significantly. It has been widely used in various fields and will dominate the future flow meters. It is the ideal substitute for orifice flowmeter. The vortex flowmeter sets a vertical column in the measuring pipe, and the fluid passes through the two sides of the column to alternately generate regular vortices, which are also called Karman vortex streets. The release frequency of the Karman vortex street is related to the flow velocity of the fluid and the width of the column, which can be expressed by the following formula: where f is the release frequency of the Karman vortex street; Sr is the sensor coefficient (called the Strohha number); Flow velocity; d - column width This formula shows that when the instrument coefficient Sr and the column width d remain unchanged, the frequency of the Karman vortex street is proportional to the flow velocity of the fluid. Therefore, by measuring the release frequency of the Karman vortex street The instantaneous flow rate of the fluid in the pipe can be calculated. The vortex release frequency of the KTLU series vortex flow sensor is detected by the piezoelectric element inside it according to the stress acting on the detection sensor alternately by the vortex. 2. Composition of measurement system The flow measurement system of high-pressure air consists of Huaian Runtai RTLUGB vortex flow sensor and intelligent flow totalizer. The vortex sensor is mainly composed of sensor (with amplifying board), connecting rod, and vortex generator assembly (with triangular column and probe), which can be used for the measurement of superheated steam, saturated steam, compressed air and general gases. In this measurement system, the vortex flow sensor is installed on the vertical pipe, and it sends the pulse signal corresponding to the high-pressure wind flow to the intelligent flow totalizer. The intelligent flow totalizer adopts advanced single-chip technology, and can cooperate with vortex flow sensor or orifice flow sensor for flow measurement. It has a full Chinese LCD display, which can display instantaneous flow, instantaneous heat, cumulative flow, cumulative heat, and vortex flow. Frequency, medium pressure temperature, density, time and date and other information, and also has rich functions such as automatic compensation of small flow, power failure compensation, automatic meter reading and so on. Connecting the temperature and pressure signal can also automatically perform temperature and pressure compensation. It converts the pulse signal from the flow sensor into instantaneous flow and accumulates it for local display, and outputs a 4~20mA signal proportional to the instantaneous flow to facilitate the connection with the DCS. 3. Precautions in use 1. Correctly installing the sensor is the primary premise to ensure accurate and reliable measurement. If you make mistakes in the selection of the installation location and method, the measurement accuracy will be affected, and the service life of the sensor will be affected or even damaged. sensor. ① When installing the sensor in the proper straight pipe section, the length of the upstream straight pipe section is generally 15-40DN, and the length of the downstream section is 5DN. It can be adjusted appropriately according to the conditions of the upstream and downstream pipes to ensure the measurement accuracy. The sensor should also avoid installing the sensor on a very long overhead pipeline. After a long time, the seal between the sensor and the flange will easily leak due to the sagging of the sensor. If it is necessary to install it, it must be installed at the upstream and downstream 2D ​​of the sensor. Fastening devices such as pipe brackets are respectively provided. ② Avoid strong vibration The sensor should not be installed on the pipeline with strong vibration. If it is necessary to install it, vibration reduction measures must be adopted, and the pipeline fastening device should be installed at the upstream and downstream 2D ​​of the sensor, and anti-vibration pads should be added. The vibration at the outlet of the air compressor is strong, so the sensor cannot be installed, and should be installed after the air storage tank. ③Select the appropriate installation method according to the measuring fluid. When measuring the high pressure wind,You can choose to install the sensor on a horizontal pipe or a vertical pipe, but if the moisture content in the high-pressure wind is high, the sensor should be installed at a higher part of the pipeline when installed horizontally, and the gas flow direction should be from bottom to top when installed vertically. Whether installed horizontally or vertically, the flow direction of the fluid must be consistent with the flow direction arrow on the sensor body.

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