Brief Analysis of Measurement Error of Rotor Type Flow Meter

Abstract: The brief analysis information of the measurement error of the rotor type flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. From the measurement principle of the rotor type flow juice, it is known that it is composed of an orifice differential pressure flowmeter and a turbine flowmeter. It has both the measurement error of the orifice differential pressure flowmeter and the error of the turbine transmission system. Therefore, the error of the rotary vane flowmeter may be more than that. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is a brief analysis of the measurement error of the rotor-type flowmeter. From the measurement principle of the rotor type flow juice, it is known that it is composed of an orifice differential pressure flowmeter and a turbine flowmeter. It has both the measurement error of the orifice differential pressure flowmeter and the error of the turbine transmission system. Therefore, the error of the rotary vane flowmeter may be larger than that of the differential pressure flowmeter. The measurement error of the differential pressure flowmeter under the set working conditions is 1-2%, while the error of the rotary flowmeter when it leaves the factory for±4%, from the analysis of the measurement signal conversion or transmission link, the rotor-type flowmeter has at least the following errors: 1. The error meter generated by the throttling orifice is throttled through the orifice. The differential pressure △P before and after the orifice makes the impeller Rotation, that is to say, the differential pressure signal of the orifice plate is not converted by the differential pressure transmitter, but by the impeller. Therefore, the instrument does not exclude the error of the differential pressure flow meter. In the rotor type flowmeter, according to different The flow range is limited, and three orifice plates with different diameters of d20 are used. This configuration method cannot have the high precision of the orifice plate of the differential pressure flowmeter, because the orifice plate of the differential pressure flowmeter is in a series of known conditions, carefully designed. It can be seen from this that the throttle orifice error of the rotary vane flowmeter is larger than that of the differential pressure flowmeter. 2. The conversion of the differential pressure signal into the conversion error of the impeller speed (△p/n) The conversion of the measurement signal will inevitably produce Error, the differential pressure signal is converted into turbine speed, and the conversion error between them may be large. Differential pressure is potential energy. To make the impeller rotate, the potential energy needs to be converted into kinetic energy through the nozzle. In the instrument, a slight change in the relative position of the nozzle and the nozzle baffle will affect the speed of the impeller and cause measurement errors. 3. Flow measurement error caused by steam pressure fluctuation The instrument shows mass flow blockage. Mass flow depends not only on fluid velocity, but also on flow density. When the steam pressure fluctuates, the density of the steam also fluctuates, and the pressure fluctuates greatly. , density fluctuations are also large, resulting in flow measurement errors. A pressure compensation device is set in the rotor type flowmeter. This pressure compensation device is a mechanical structure and is preset according to the steam pressure value. It can be seen that this compensation method cannot effectively correct the fluid density, let alone track the fluid. density fluctuations. Therefore, the flow measurement error caused by the fluctuation of steam pressure will exist accordingly. 4. Flow measurement error caused by the moisture content in the steam The saturated steam measured by the rotor type flowmeter is all wet steam containing moisture, which is the same as the differential pressure flowmeter. Due to the change of the measurement object of the instrument, a large measurement error will occur. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of Measurement Error of Rotor-type Flow Meter'

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