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『Selection of metal rotor flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Pressure loss of rotor flowmeter
The pressure loss of rotor flowmeter mainly depends on its structural design, rotor shape, and flow range, usually between a few kPa and tens of kPa, much lower than that of orifice plate and other throttling flowmeters The pressure loss range of rotor flow meters with different diameters and types varies significantly: • Small glass tube rotor flow meters (DN15-DN25): full range pressure loss of about 1.5-4 kPa • Metal tube rotor flow meters (DN50-DN100): full range pressure loss of about 5-25 kPa • High pressure or large diameter special models: maximum pressure loss can reach more than 50 kPa 2. Key influencing factors • Rotor shape: The streamlined design of elliptical rotors can significantly reduce pressure loss, which is more than 30% smaller than spherical rotors • Cone tube angle: The smaller the cone tube taper (usually 2-3 °), the lower the pressure loss but the measurement range becomes narrower • Medium viscosity: When measuring high viscosity fluids, the pressure loss will increase by 20-50% • Flow upper limit: Actual flow rate used The closer to full range, the greater the pressure loss Compared with other flow meters in terms of pressure loss • VS orifice flow meter: the pressure loss of the rotor flow meter is only 1/3-1/5 of that of the orifice plate (the typical pressure loss of the orifice plate is 20-100 kPa) • VS vortex flow meter: the pressure loss of the two is comparable, but the pressure loss of the vortex street is smaller at low flow rates • VS electromagnetic flow meter: the electromagnetic flow meter has almost no additional pressure loss (only pipeline friction loss). 4 Practical solution to reduce pressure loss • Reserve margin when selecting:
2. What is the approximate price of a rotor flowmeter?
3. Measurement method and instrument selection of rotor flowmeter
The measurement method of rotor flowmeter is mainly based on the principle of variable area, and the flow value is determined by observing the stable position height of the float in the conical tube;
; The selection of instruments should be based on the characteristics of the medium, pipe diameter, flow range, and environmental conditions to choose glass or metal materials, and consider the type of output signal and additional functions. The following is a specific explanation: Basic principle of measurement method: The rotor flowmeter consists of a vertical cone tube and a freely movable float. When the measured medium flows from bottom to top through the conical tube, the float rises due to the action of flow velocity and buoyancy, and the annular gap area increases accordingly. The decrease in flow velocity leads to a d