What is volumetric flow meter?
A volumetric flow meter is an instrument that can measure the volume of fluid passing through the measurement location within a set period of time.
A positive displacement flowmeter as a mechanical flow meter is a common type of Volumetric Flow Meter. It can measure the volume flow of high viscosity and corrosive fluids.
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The volumetric flow rate studies the volume of fluid passing through a specified cross-section per unit time. It is a measure of the 3-dimensional space occupied by the gas flowing through the instrument under the measured pressure and temperature conditions. The volume flow rate can also be referred to as the actual flow rate.
The volumetric flow rate is the ratio of fluid volume to time. The unit in the International System of Units is m³/h. The measured value can be obtained by a volumetric flow rate meter.
Therefore, a volumetric flow meter is an instrument that can directly or indirectly measure the volume of fluid passing through the measurement location within a set period of time.
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Mass flow refers to the mass of fluid passing through the effective cross-section of a closed pipe or open groove in a unit time. Unit: kg/h, kg/s. Corresponding to volume flow (volume of fluid passing through unit time), it can be expressed as the product of volume flow and fluid density.
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The mass flow rate is defined as the mass of the fluid flowing through a unit cross-sectional area in a unit time, that is, the mass flow borne by the unit cross-sectional area. It is usually expressed by G, and the unit is Kg/(m2*s).
Calculation of mass flow rate: G=W/A,
Where W is the mass flow rate in kg/s;
A is the circulation area, the unit is m2.
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Comparing Mass Flow Rate to Volumetric Flow Rate
The mass flow rate is directly measured by a mass flow meter, without intermediate parameter conversion. Measure the number of molecules passing through the instrument, regardless of how much space these molecules occupy. Pressure and temperature have no effect on it.
The volumetric flow measures the three-dimensional space occupied by the gas flowing through the instrument under the pressure and temperature conditions to be measured. The volumetric flowmeter does not directly measure the volume but undergoes intermediate parameter conversion.
For example, the mass flow rate and volume flow rate of the gas. Gas is compressible, and when the pressure or temperature changes, the volume flow will change greatly.
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Mass Flow Meters
The mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density of the medium and indirectly measure the temperature of the medium.
Since the transmitter is an intelligent instrument with a single-chip microcomputer as the core, more than a dozen parameters can be derived for users to use based on the above three basic quantities.
The mass flow meter has flexible configuration, powerful functions and high performance-price ratio. It is a new generation flow meter
Volumetric Flow Meters
A volumetric flow meter is an instrument that can directly or indirectly measure the volume of a substance passing through a specific location within a set period of time.
In fact, many volumetric flow meters measure the velocity of the flow instead of directly measuring the volume flow rate. By multiplying the flow rate by the cross-sectional area of the pipe or pipe where the volume flow meter is installed, that is, Q = v·A, the flow rate measurement value can be converted into a volume flow rate.
Volume flow meters can provide instantaneous analog, digital or pulse output of volume flow.
There are many different units used to measure volumetric flow. The type of substance, the size of the cross-sectional area, the flow rate, and the geographic area will all determine the most suitable volume and time unit for a particular flow measurement. The popular volumetric flow rate units are liters or gallons per second, minutes or hours (L/s, L/m, L/h, gps, gpm, gph).
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Types of Volumetric Flow Meters
Common Volumetric flow meters are as follows:
- Positive displacement meters
- Electromagnetic Flowmeter
- Ultrasonic flowmeter
- Turbine flow meters
- Orifice plates
- Venturis
- Vortex meters
- Pitot tubes
- Rotometers etc.
Examples of Mass Flow Meters
Generally speaking, mass flow meters are mainly divided into:
- Thermal mass flow meter;
- Differential pressure mass flow meter;
- Coriolis mass flow meter;
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Volumetric flow meter working principle
The positive displacement flow meter is a flow meter that uses mechanical measuring elements to continuously divide the fluid into a single known volume, and repeatedly fill and discharge the volume of fluid to accumulate the total amount of fluid.
Volumetric flow measurement uses a fixed small volume to repeatedly measure the volume of fluid passing through the flowmeter.
Therefore, there must be a standard volume of space inside the positive displacement flowmeter, which is usually called the “metering space” or “metering chamber” of the positive displacement flowmeter.
This space is formed by the inner wall of the instrument case and the rotating parts of the flowmeter.
The working principle of a positive displacement flow meter is: fluid passing through the flow meter will produce a certain pressure difference between the inlet and outlet of the flow meter.
The rotating part of the flowmeter (referred to as the rotor) rotates under the action of this pressure difference, and discharges the fluid from the inlet to the outlet.
In this process, the fluid fills the “metering space” of the flowmeter again and again, and then is continuously sent to the outlet.
Under the conditions of a given flow meter, the volume of the metering space is determined. As long as the number of rotations of the rotor is measured, the cumulative value of the volume of fluid passing through the flow meter can be obtained. Flow rate of viscous fluids such as oils, condensate, resin and liquid food.
For the flow of high-viscosity media, other flowmeters are difficult to measure, but positive displacement flowmeters can accurately measure with an accuracy of ±0.2%.
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How to convert Mass Flow Rate & Volumetric Flow Rate
- If the mass flow of the flow is known and needs to be converted into volume flow, the following formula can be used: qv=qm/ρ. In the formula, qv is volume flow, m3/s. qm is mass flow, kg/s. ρ is fluid Density, kg/m3.
- If the volume flow rate of the fluid is known, it needs to be converted into a mass flow rate, which can be done with the formula: qm=qv×ρ.
We provide you with some calculation tools for Mass Flow Rate & Volumetric Flow Rate conversion:
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Sino-Inst, Manufacuturer for Volumetric Flow Meters. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.
Sino-Inst’s Volumetric Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
What is Volumetric Flow Meter? How it works? Vs Mass Flow
A volumetric flow meter is an instrument that can measure the volume of fluid passing through the measurement location within a set period of time.
Product SKU: Volumetric Flow Meters
Product Brand: Sino-Inst
Product Currency: USD
Product Price: 500
Price Valid Until: 2059-09-30
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