Types of Measuring Gas Flow Meters

Vortex flowmeters are mainly used for flow measurement of industrial pipeline media fluids, such as gas, steam and other media. It is characterized by small pressure loss, large measuring range and high precision. It is almost not affected by parameters such as fluid density, pressure, temperature and viscosity when measuring volume flow in working conditions. There are no moving mechanical parts, resulting in high reliability and low maintenance. Instrument parameters can be stable for a long time. The vortex flowmeter adopts piezoelectric stress sensor, which has high reliability and can work in the working temperature range of -20℃～+250℃. It has analog standard signal and digital pulse signal output. It is easy to be used with computer and other digital systems. It is a relatively advanced and ideal measuring instrument. The range is very wide, the price is relatively cheap, and the application is widest. The flow profile of the flow sensor of the swirling vortex flowmeter is similar to the profile of a Venturi tube. A set of spiral guide vanes are placed on the inlet side. When the fluid enters the flow sensor, the guide vanes force the fluid to generate a severe vortex flow. When the fluid enters the diffusion section, the vortex flow is affected by the backflow and starts to rotate twice, forming a gyroscopic vortex precession phenomenon. The precession frequency is proportional to the flow rate and is not affected by the physical properties and density of the fluid. The detection element can obtain good linearity in a wide flow range by measuring the secondary rotational precession frequency of the fluid. The signal is amplified, filtered, and shaped by the preamplifier and converted into a pulse signal proportional to the flow rate, and then sent to the microprocessor together with the temperature, pressure and other detection signals for cumulative processing, and finally displayed on the LCD screen. Measurement results (instantaneous flow, cumulative flow and temperature, pressure data). The price is relatively medium, and the gas measurement range is slightly lower. It is mostly used to measure fuel gases such as natural gas, liquefied petroleum gas, and oxygen and hydrogen. Turbine flowmeter Gas turbine flowmeter uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate. This kind of flowmeter is used to detect instantaneous flow and total cumulative flow, and its output signal is frequency, which is easy to digitize. In the figure, the induction coil and the permanent magnet are fixed on the shell together. When the ferromagnetic turbine blades pass by the magnet, the reluctance of the magnetic circuit changes, thereby generating an induced signal. The signal is amplified and shaped by the amplifier, and sent to the counter or frequency meter to display the total accumulated flow. At the same time, the pulse frequency is converted to frequency-voltage to indicate the instantaneous flow rate. The speed of the impeller is proportional to the flow rate, and the number of revolutions of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system. It has a turndown ratio of up to 10:1 and an accuracy of±Within 0.2%. The time constant of the turbine flowmeter with low inertia and small size can reach 0.01 seconds. The gas turbine flowmeter is a relatively ideal trade settlement gas flowmeter, which can display temperature, pressure, instantaneous flow, cumulative flow, daily cumulative flow, etc. on the same screen. When the price is relatively high, the cleanliness of the medium is relatively high. Verabar Flowmeter The Verabar Flowmeter is an insertion type flow measuring instrument. A Verabar sensor is inserted in the pipeline, and when the fluid flows through the sensor, a high pressure distribution area is generated in front of it (in the direction of flow) and a low pressure distribution area is generated in its rear. There are multiple pairs of sensors arranged in a certain order in the high and low pressure areas, usually three pairs of pressure-taking holes, which measure the total pressure of the fluid, including static pressure and average velocity pressure P1 and static pressure P2. Introduce P1 and P2 into the differential pressure transmitter respectively, and measure the differential pressure △P=P1-P2, △P reflects the average velocity of the fluid, so the flow rate of the fluid can be calculated. It is a typical differential pressure flowmeter. The technology comes from the United States. It is widely used in the occasions of low flow rate in large pipelines. It is equipped with a high-precision differential pressure transmitter to achieve accurate measurement of low flow rate gas in large pipelines, and the cost is simple. , a very good gas flow meter

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