Effects of ultrasonic flow meter accuracy factor
Date：2018-12-29
From：
Exclude liquid flow meter principle and structure of its own reasons, affect the accuracy and the external factors mainly attributed to the following three aspects:
1.The fluid properties
In the scene through the flow meter of the fluid may not like the laboratory used by fluid so clean, they may precipitate, corrosive. After a period of use, but also in the tube edge detection component wear, corrosion, scale deposit generated. In the wall of the tube of theprecipitate will change the pipeline wall thickness and roughness. On the standard orifice plate can change the β value, causing the error of± 3~10%; on the turbine, rotor, displacement meter movement parts abrasion, corrosion, light weight error, is unable to work; on electromagnetic flowmeter, ultrasonic flowmeter transducer electrodes, thermal type flow meter in the thermal resistance of thepollution will be reduced its sensitivity, increase the error of differential pressure flowmeter; pressure sampling hole caused by obstruction, etc.. Of course, this process is slow, but never let down. But as long as attention to regular repair and form the system canreduce ( or eliminate ) their impact.
2.fluid
The tests commonly used in the medium is water, air and oil. And in the field of application is faced with will be tens of thousands of various fluid, its physical properties ( such as density, viscosity, thermal conductivity, electrical conductors, sound velocity, component ...... ) are different from those in the tests commonly used in the media, will be more or less affected flow meter accuracy. But these fluidcan pass through some engineering manual check, and corrected to mitigate the impact. This is also the flow meter intelligent is an important content of.
3.flow characteristics
In the laboratory, flow meter should be in the ideal state of flowing, it should be:
Newton fluid: in process industry, in addition to food industry for the Newton fluid.