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How to read a rotor flowmeter? Why?
The reading method for the rotor flowmeter is as follows: For the sub flowmeter reading method, stand in front of the flowmeter, with your eyes parallel to the float, and move your line of sight horizontally to the left until you see the outline of the float touching the positioning line. The corresponding reading value is at the intersection of the positioning line and the horizontal scale in the middle of the float.. A rotor flowmeter measures fluid flow based on the principle of throttling, but it changes the flow area of the fluid to maintain a constant differential pressure between the upper and lower parts of the rotor. Therefore, it is also known as a variable flow area constant differential pressure flowmeter or a float flowmeter. In a vertical conical tube that expands from bottom to top, the gravity of the circular cross-section float is supported by liquid dynamics, and the float can freely rise and fall inside the conical tube. Under the action of flow velocity and buoyancy, it moves up and down, and after balancing with the weight of the float, it is transmitted through magnetic coupling to indicate the flow rate on the dial. Generally divided into glass and metal flutter rotor flow meters. Metal rotor flowmeter is the most commonly used in industry. For small diameter corrosive media, glass material is usually used. Due to the inherent fragility of glass material, rotor flowmeters made of precious metals such as all titanium are also used for key control points. Rotary flowmeter is a variable area flow meter based on float position measurement. Adopting an all metal structure and modular concept design, it has low pressure loss, large range ratio (10:1),
2. What are the factors that affect the accuracy of metal rotor flow meters?
The factors that affect the accuracy of metal rotor flow meters mainly include the following:
1. Processing accuracy of cone tube and float. Cone tube uniformity: Metal rotor flow meters measure flow by verifying the height of the float and display the results on the surface plate through magnetic coupling principle.
. Therefore, the uniformity of the taper of the cone tube is crucial for accuracy. When the uniformity of the cone tube is poor, it will increase measurement errors, and increasing the number of actual calibration points can improve accuracy.2. Experimental error of flow coefficient: The flow coefficient is obtained through experimental measurement, so there is an experimental error.
. The accuracy of the C-Re curve has a significant impact on the accuracy of the float flowmeter, especially in the transition zone between low Reynolds numbers or laminar and turbulent flow, where the impact on accuracy is more significant. In these situations, it is best to use real current calibration to improve accuracy.Third, the uncertainty of the accuracy of the standard: The uncertainty inherent in the measuring standard itself can affect the accuracy of the flowmeter scale during measurement calibration.
. Therefore, choosing high-precision and high stability standards is crucial for improving the accuracy of flow meters.Fourth, the influence of physical conditions on fluid characteristics: Changes in physical conditions such as flu
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