Selection of metal rotor flowmeter | Measurement method and instrument selection of rotor flowmeter

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1. Introduction to Metal Tube Rotor Flowmeters

The SZFZ series metal rotor flowmeter, professionally produced, has the characteristics of simple structure, reliable operation, wide application range, accurate measurement of faults, and easy installation. Detailed information on SZ-FZ metal rotor flowmeter: It has high temperature resistance, high pressure resistance, and SZFZ series silver metal rotor flowmeter has ordinary and anti-corrosion types. The above two types are divided into on-site indication type (SZFZZ -) and electric remote transmission type (SZFZD -), ordinary flow sensor, instrument material (1Cr18Ni9Ti), and anti-corrosion type (1Cr18Ni9Ti) lined with PTEF. If the medium measured by the metal rotor flowmeter contains ferromagnetic particles, a magnetic filter should be installed at the inlet of the flowmeter. Its material should be the same as the corresponding flowmeter.

2. 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 to 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 Selection of metal rotor flowmeter

• 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: Keep the normal operating flow within the range of 30-70% of the flowmeters range • Choose a model specifically designed for low pressure loss, such as the OPTISWRL 4200 series vortex flowmeter from Cologne • Regular maintenance: Keep the rotor active and flexible to avoid particle accumulation and increase pressure loss. 5 For pumping systems, it is recommended to control the flow meter pressure loss within 10% of the total system pressure loss; The self linked flow system should choose a model with lower pressure loss (such as<2 kPa). The latest national standard GB/T 2624-2022 has detailed regulations on the pressure loss testing method for flow meters. When selecting, suppliers can be required to provide test reports that comply with this standard.

Selection of metal rotor flowmeter | Measurement method and instrument selection of rotor flowmeter

1. Introduction to Metal Tube Rotor Flowmeters

2. Pressure loss of rotor flowmeter

3. Measurement method and instrument selection of rotor f

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