Wide Range Ratio Waist Wheel Flowmeter , Precision Roots Flowmeter For High

MOQ： 1Set
Price： Negotiable
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Payment Terms	Western Union,T/T,D/P,D/A,L/C
Supply Ability	100PCS/Month
Delivery Time	5-8 work days
Packaging Details	Carton
Product Name	Roots Flowmeter
Fluid Compatibility	Water, Oil, Chemicals
Repeat Ability	±0.1%
Material	Stainless Steel / Aluminum
Power Supply	24 VDC / 110 VAC
Installation Orientation	Horizontal or Vertical
Measurement Principle	Positive Displacement
Connection Size	1/2 inch to 4 inches
Display Type	LCD / LED
Output Signal	Pulse / Analog / Digital
Brand Name	QINWEIYB
Model Number	QWLZB-42
Place of Origin	China

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Product Specification


Payment Terms	Western Union,T/T,D/P,D/A,L/C	Supply Ability	100PCS/Month
Delivery Time	5-8 work days	Packaging Details	Carton
Product Name	Roots Flowmeter	Fluid Compatibility	Water, Oil, Chemicals
Repeat Ability	±0.1%	Material	Stainless Steel / Aluminum
Power Supply	24 VDC / 110 VAC	Installation Orientation	Horizontal or Vertical
Measurement Principle	Positive Displacement	Connection Size	1/2 inch to 4 inches
Display Type	LCD / LED	Output Signal	Pulse / Analog / Digital
Brand Name	QINWEIYB	Model Number	QWLZB-42
Place of Origin	China
High Light	Wide Range Ratio Waist Wheel Flowmeter ，Precision Roots Flowmeter ，High Viscosity Media Roots Flowmeter

High-Precision Wide-Range Ratio Waist Wheel Flowmeter Suitable For High Viscosity Media

The waist wheel flowmeter (also known as the Roots flowmeter) is a high-precision volumetric flow measurement instrument. It divides the fluid into fixed volume units for measurement by rotating a pair of 8-shaped waist wheels driven by fluid pressure difference.

advantage

High Precision: Extremely high precision, generally achievable to ±0.5%, and even up to ±0.2% or higher. It is a trade settlement-grade measuring instrument.
Wide range ratio: The range ratio is very wide, typically up to 20:1 or even higher. This means high accuracy can be maintained over a wide range of flow rates.
Suitable for high-viscosity media: insensitive to viscosity changes, making it ideal for measuring viscous fluids such as crude oil and heavy oil.
Low pressure loss: Due to the non-contact between the lobes, the operational resistance is relatively small, resulting in a lower pressure loss compared to elliptical gear flowmeters.
Low vibration and noise: It operates smoothly, with noise and vibration levels significantly lower than those of elliptical gear flowmeters.
Low starting flow rate: Due to the gap between rotors and the low starting friction, it is capable of measuring very small flow rates.

Characteristics

Characteristics	Elliptic gear flowmeter	Waist wheel flowmeter
Core structure	Two directly meshing elliptical gears	Two non-contacting waist-shaped rotors, driven by external synchronous gears
Operating principle	The gears mesh with each other to drive, similar to a gear pump.	The rotor forms a sealed chamber under the control of synchronous gears
Vibration and noise	Larger (direct gear mesh impact)	Smaller (non-contact, smooth operation)
Pressure loss	relatively large	relatively small
Wear and tear	There is wear and tear on the gear meshing surface.	The main wear and tear is on the bearings and synchronous gears, while the rotor itself experiences minimal wear and tear
Cost	Relatively low	relatively high, especially for large diameters
Applicable caliber	Commonly used for small and medium-sized calibers.	The caliber range is wider, covering from small to large sizes
Application focus	Universal high-viscosity process metering, high cost-effectiveness	trade settlement, high-precision, high-reliability requirements

Typical application scenarios

Waist wheel flowmeters are commonly used for trade settlement and high-precision process control due to their high accuracy and wide measurement range ratio.
Oil and natural gas: trade settlement for crude oil transportation, precise metering of refined oil products (diesel, gasoline), and metering of liquefied petroleum gas (LPG) and liquefied natural gas (LNG).
Chemical industry: metering of various chemical raw materials, solvents, and polymers.
Food : Edible oil, syrup, chocolate, dairy products, etc.
Urban gas: High-pressure gas metering for industrial and large users.
Others: Any occasion requiring high-precision and high-repetitiveness volume measurement.

Precautions for model selection and installation

Filters are essential: It is emphasized again that filters (usually recommended to be 100μm or finer, depending on product requirements) must be installed upstream of the flowmeter. This is the lifeline to ensure its long-term accurate operation.
Installation direction: Most require horizontal installation, ensuring that the direction of the arrow on the flowmeter housing is consistent with the fluid flow direction. The meter head is usually facing up for easy reading.
Exhaust: Before startup, it is essential to fully exhaust the flowmeter and pipeline to prevent gas from occupying the metering chamber, which could lead to measurement errors and equipment damage.
Maintenance: Regular inspection of the wear condition of bearings and synchronizing gears is required, along with calibration.

summary

The waist wheel flowmeter is a "high-end product" within the family of volumetric flowmeters. It achieves extremely high accuracy, smooth operation, and a wide measurement range ratio through its non-contact waist wheel and synchronous gear design. Although its manufacturing cost and cleanliness requirements are relatively high, it is undoubtedly one of the preferred solutions in fields such as crude oil trade and fine chemicals, where measurement accuracy and reliability are highly demanded.

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Xi 'an Qinwei Instrument Factory (General Partnership Enterprise)
No. 143, Sanqiao Street, Xi'an City, Shaanxi Province, China
https://www.radarlevelgauges.com/

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