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Using Flowmeters for Varying Tasks – Part one: Blending and Mixing

Pelton Wheel

Being highly efficient, the Pelton Wheel meter, also known as a radial turbine, has many distinct advantages:

  • The blade area, being very large compared with the flow inlet port size, produces an exceptionally wide-range flowmeter, which easily can measure very low flows.
  • The flow through the inlet of the meter is accurately directed onto the rotor.
  • The rotor rotates at a speed in linear proportion to the flow rate.
  • A small sensing coil detects the ferrites mounted in the flowmeter rotor blade tips as they pass.
  • There is no drag imposed on the rotor, therefore assisting in an accurate measurement of extremely low flows.
  • Having Sapphire bearings allows for mechanically robust bearings with a long-life expectancy, also providing low friction.
  • Turndown can be as high as 280:1.

 

The Pelton Wheel meter is ideally suited for low viscosity process liquids with a measurement up to 2-inch pipe sizes and larger, as well as up to 10 cSt.; 0.003 to 500 lpm; ±2.0% of reading. Some models of this turbine flow meter are even suitable for flow measurement at higher pressure. The usage of a Pelton Wheel meter is superior in a multitude of ways, allowing for an accurate measurement of extremely low flows that cannot be compared.

 

Thermal Mass Capillary & Thermal Mass Industrial

Based on heat transfer and the first law of thermodynamics, the Capillary Thermal principle of operation begins when gas enters the instrument’s flow body, dividing it into two flow paths during operation. While the vast majority of the gas flow passes through the Laminar Flow Element Bypass, or LFE, a very small portion of the total flow is diverted through a small “Capillary” sensor tube. This sensor tube has an ID between .007 to .028 inches. The technology which allows this process is ideal for gas flow measurement as well as gas flow control. 

 

Varying from the Thermal Mass Capillary, the Thermal Mass Industrial has very little pressure drop across an immersible sensor because the flow does not have to pass through the LFE. The Thermal Mass Industrial’s immersible thermal sensor, as its name entails, is completely immersed into the flow stream, allowing for it to measure much higher rates of gas mass flow in harsher environments as compared to the Thermal Mass Capillary flowmeter.

 

Special Axial and Radial Turbine

 

Industries that entail the dispensing measurement at point of sale rely on flow measurement. Whether it is required to dispense beer or cold drinks, cellar auditing systems, coffee makers (industrial and domestic) or for vending machines, these meters can help. The devices are ideally suited for low pressure process liquid flow measurement using plastic bodies from PVDF or PP – from about 0.050 lpm to 15 lpm, or 0.1 to 120 lpm.

 

Positive Displacement

Positive displacement flowmeters, also called PD meters, measure volumes of liquid flowing through by repeatedly counting the discharging and filling of known fixed volumes. A typical PD meter comprises a chamber that obstructs the flow. Inside the chamber, a reciprocating mechanical unit is placed to create fixed-volume discrete parcels from the passing fluid.

 

It is severe to have the right flowmeters installed in order to get the most accurate readings possible. Without relying on the right technology, the result of your measurements will be compromised.

 

At JLC International, we distribute a wide range of flowmeters and other devices, like  Dewpoint Transmitters, to industries all across the country. For more details about the measurement instruments, visit us at  http://jlcinternational.com.