## 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.

• High measurement accuracy;
• The installation pipeline conditions have no influence on the measurement accuracy;
• Can be used for high-viscosity liquids;
• Wide range;
• The direct-reading meter can directly obtain the cumulative and total amount without external energy.
• Clear and clear, easy to operate.

Sino-Inst offers a variety of Oval Gear Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

## Featured Volumetric Flow Meters

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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.

Extended reading: Gas mass flow controller working principle

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.

Extended reading: Mass Flow Rate Units Converter

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.

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.

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.

Extended reading: Totalizing flow meter water

### 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%.

Positive Displacement Flow meter Technology

What is volume flow rate?

Volume flow refers to the flow in which the quantity of fluid is expressed in volume. The volume flow is expressed by the formula: qv=V/t=u×A, in the formula: qv is the volume flow, m3/s; V is the unit flow volume, m3; t is the unit time, s; u is the average flow velocity in the pipe, m /s; A is the cross-sectional area of the pipe, m2.

Among the commonly used flowmeters, such as orifice plate, turbine flowmeter, vortex flowmeter, electromagnetic flowmeter, rotameter, ultrasonic flowmeter and oval gear flowmeter, the flow measurement value is the volume flow of the fluid.

What is mass flow rate?

Mass flow refers to the flow in which the quantity of fluid is expressed in terms of mass. The mass flow can be expressed by the formula: qm=m/t=ρ×u×A, in the formula qm is the mass flow, kg/s; m is the unit fluid mass, kg; ρ is the fluid density, kg/m3; t is the unit time , s; u is the average flow velocity in the pipe, m/s; A is the cross-sectional area of the pipe, m2.

Understanding the relationship between Pipe Diameter Vs Pressure Vs Flow may help you calculate mass or volume flow.

## How to convert Mass Flow Rate & Volumetric Flow Rate

1. 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.
2. 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:

## More Featured Liquid and Gas Flow Meters

Mass flowmeter is a direct measurement type, such as Coriolis (Coriolis) mass flowmeter, thermal flowmeter. In terms of electronic control, there are mainly phase difference type and dedicated line (membrane) type.

Volumetric flow meters are of the indirect measurement type. In terms of electronic control, there are mainly differential pressure type, Karman scroll type, electromagnetic induction type, volumetric type and so on. It is converted into mass flow through pressure sensor, temperature sensor, measuring pressure and temperature.

More about: Mass Flow Meter Types

Flow is the ratio of the amount of fluid in a cross-section of a pipe to the time it takes for that flow to pass through the cross-section. Flow is divided into volume flow and mass flow.

Volume flow refers to a unit when measuring flow, which refers to the volume of inflow (out, through) a certain liquid per unit time. For example: cubic meters per hour; liters per hour; cubic meters per minute, etc.

Volume flow calculation formula: Vs=3.14ud*d/4
In the formula: Vs volume flow rate, U flow rate, d pipe inner diameter.
Volume flow is the volume of flow through the flow cross section per unit time, referred to as flow, expressed by Q.

Read More: Pipe Diameter vs Pressure vs Flow

Extended Reading: How to Measure Volume of Liquid

If you let me answer this question. I would like to divide flow meters into two categories: mass flow meters and volumetric flow meters.

Of course, it can also be divided according to the measurement medium. There are two types of flow meters for measuring gas and measuring liquid.

Perhaps, we can also divide into closed pipeline measurement and open channel measurement according to the situation of the pipeline.

Finally, we may also be able to divide into contact and non-contact measurements according to the contact situation of the medium.

If the flowmeter is divided into 5 categories. Then the five commonly used flowmeters are:

1. Electromagnetic flowmeter
2. Differential pressure flowmeter
3. Turbine flowmeter
4. Ultrasonic flowmeter
5. Volumetric flowmeter (PD)

Extended reading: non contact flow meter

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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.

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##### 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

Product In-Stock: PreOrder

Editor's Rating:
5