Roots flowmeter

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Which is more precise, ultrasonic, turbine, or Roots flowmeter? Different applications have different requirements. What are the differences in the use of acoustic, turbine, and Roots gas flow meters in natural gas metering? Author: Shanghai Keqi Instrument Co., Ltd. Currently, the widely used flow meters in natural gas flow measurement include gas turbine flow meters, gas ultrasonic flow meters, gas Roots flow meters, etc. These types of flow meters each have their own advantages and disadvantages. Gas ultrasonic flowmeter is a new flow measurement method that has emerged in recent years. Its design is relatively complicated, so its price is also relatively high. At present, there are relatively few manufacturers that can produce it, and its scope of use is only limited to natural gas transmission pipelines. Most of them are openly used by large enterprises. As the scope of use expands, production costs are gradually decreasing, and there is a trend towards replacing gas turbine flow meters. Its measurement accuracy is high and maintenance is minimal. Please visit http://www.keqi-sensor.com. 2. Gas turbine flowmeter is a velocity type flow measurement instrument. When the fluid flows into the flowmeter, it is rectified and accelerated by the leading fluid (or rectifier). Due to the angle between the turbine blades and the fluid flow direction, the turbine generates a rotational torque. After overcoming the friction torque and fluid resistance torque, the turbine begins to rotate. Within a certain flow range, the angular velocity of turbine rotation is proportional to the fluid volume flow rate. According to the principle of electromagnetic induction, a magnetic sensor is used to sense a pulse signal proportional to the fluid volume flow rate from a synchronously rotating reference wheel. The signal is amplified, filtered, and shaped before being sent to an intelligent volume correction instrument for processing along with temperature, pressure, and other signals, and displayed on an LCD screen. High precision and easy measurement. However, due to the presence of an impeller, there is a pressure difference between the upper and lower ends of the flowmeter, and the pressure that the impeller is constantly subjected to places high demands on its bearings. Thats also why the turbine flowmeter needs to be replaced in 2-3 years. Moreover, the range ratio of the turbine flowmeter is too narrow, which can result in measurement errors during peak and underestimation of gas usage. Its price is relatively moderate. Widely used in urban gas stations and other places. 3. Gas Roots flowmeter is a volumetric flow meter. When gas passes through the flowmeter, the pressure difference generated between the inlet and outlet acts on a pair of Roots wheels coupled with high-precision synchronous gears, thereby driving the Roots wheels to rotate. During this period, the enclosed space formed between the Roots wheel and the inner wall of the housing and the pressure cover - the metering chamber - is periodically inflated and deflated. Roots made the number of revolutions of his brothers wheel proportional to the volume of gas passing through the flowmeter. The rotation of the Roots wheel is transmitted to the mechanical counter (or output flow pulse signal) through a magnetic coupler, thereby accumulating the volume of dust flowing through the measuring chamber to achieve the purpose of measurement. The gas Roots flowmeter has a small starting flow rate

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