Precise Measurement Liquid Volumetric Flowmeter For Various Liquid Media

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
Size Range	1/4 inch to 4 inch
Flow Range	Varies by model, typically 0.1 to 1000 L/min
Fluid Compatibility	Water, oil, fuel, chemicals
Measurement Principle	Positive Displacement
Power Supply	24 VDC or battery-powered
Material	Stainless steel, aluminum, or plastic
Output Signal	Pulse, analog (4-20mA), or digital
Display	Optional LCD or LED display
Brand Name	QINWEIYB
Model Number	QWLZB-46
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
Size Range	1/4 inch to 4 inch	Flow Range	Varies by model, typically 0.1 to 1000 L/min
Fluid Compatibility	Water, oil, fuel, chemicals	Measurement Principle	Positive Displacement
Power Supply	24 VDC or battery-powered	Material	Stainless steel, aluminum, or plastic
Output Signal	Pulse, analog (4-20mA), or digital	Display	Optional LCD or LED display
Brand Name	QINWEIYB	Model Number	QWLZB-46
Place of Origin	China
High Light	Liquid Volumetric Flowmeter ，Precise Measurement Volumetric Flowmeter ，Liquid Volumetric Flow Meter

Liquid Volumetric Flowmeter, Precise Measurement, Suitable For Various Liquid Media

A liquid volumetric flowmeter is a high-precision measuring instrument that divides a fixed volume of liquid through moving parts and converts the rotational speed into flow rate.

Outstanding Advantages

High Precision: It is one of the most accurate types among all flow meters, generally achieving ±0.5%, and the precision type can reach ±0.1% to ±0.2%. It is the preferred choice for liquid trade handovers, especially for high-value liquids.
Insensitive to Viscosity Changes: This is one of its core advantages. The measurement accuracy is basically unaffected by changes in fluid viscosity, making it highly suitable for measuring viscous media such as crude oil, heavy oil, lubricating oil, and polymers.
No Requirement for Straight Pipe Sections: The measurement principle is based on direct volumetric measurement and is not sensitive to flow velocity distribution. Therefore, it has very low requirements for the straight pipe sections before and after the installation, and even no straight pipe sections are needed.
High Range Ratio: It has a wide range ratio, typically reaching 10:1, and high-performance models can reach 100:1, maintaining high accuracy over a wide range of flow rates.
Direct volume measurement without external power supply (mechanical type): The mechanical meter head can directly display cumulative flow without power supply, making it highly suitable for safety and explosion-proof environments and on-site indication.

Core Parameters

Viscosity Adaptation: Conventional 0.3~1000 mPa・s, special models can cover up to 2000 mPa・s (such as high-temperature helical gear type).
Pipe Diameter and Flow Rate: Pipe diameter DN4~DN400mm, maximum flow rate can reach 2200 m³/h (for large-diameter dual-rotor models).
Working Condition Tolerance: Pressure 0.6~9.6 MPa, temperature -29℃~250℃ (high-temperature models require heat dissipation design).
Output Method: Mechanical counting, pulse, 4-20mA analog signal, intelligent models support Modbus/HART and wireless transmission.

There are mainly the following types of liquid volumetric flowmeters, which have different structures but share the same principle:

Type	Core Features	Applications
Oval gear flowmeter	Simple structure, moderate cost, viscosity adaptability 0.3~8mPa・s	Lubricating oil, syrup, general chemical liquids
Roots flowmeter	High viscosity compatibility (0.6~1000mPa・s), accuracy ±0.2%	Heavy oil, asphalt, resin and other high viscosity media
Double rotor flowmeter	Extra low pressure loss, resistant to sandy media (sand content ≤5%), accuracy ±0.1%	Crude oil transportation, viscous liquids with impurities
Screw flowmeter	Uniform sealed chamber, supports bidirectional measurement, accuracy ±0.2%	Food, medicine, fine chemical clean liquids

Industry development trends

Intelligent upgrade: It is expected that the proportion of intelligent models will exceed 50% by 2025, featuring integrated self-diagnosis, remote calibration and predictive maintenance.
Accelerated domestic substitution: Domestic high-end products have obtained API/ATEX certifications, with prices 30% to 40% lower than imported ones, and their market share has reached 52%.
Material innovation: The application of ceramic bearings and low-friction coatings has extended the service life from 5 years to over 10 years.

Liquid volumetric flowmeters are synonymous with precision and reliability. They measure the volume of fluid in the most direct mechanical way, and hold an unshakable dominant position in the precise measurement of medium to high viscosity liquids. Despite their strict requirements for medium cleanliness and pressure loss, their unparalleled accuracy and insensitivity to viscosity make them irreplaceable key equipment in trade handovers and critical process control in industries such as petroleum, chemical engineering, and food.

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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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