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.
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.
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.
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.
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).
Types of Volumetric Flow Meters
Common Volumetric flow meters are as follows:
Positive displacement meters
Turbine flow meters
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;
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%.
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:
Contents Featured CO2 flow meters for SaleIndustrial applications of CO2CO2 gas flow meterCO2 mass flow meterLiquid CO2 flow meterIndustrial petrol flow meters|Selection GuideCheap flow meters-Low Cost measurement solutionsDigital gas flow meters for SaleTotalizer flow metersStainless steel flow metersIndustrial Oxygen Flow Read More
Contents Featured inline fuel flow meters for saleCommon Industrial FuelMarine fuel flow meter-fuel flow meter for boatFuel flow meter aircraftFuel flow meter for dieselUltrasonic flow meter for fuelMechanical fuel flow meterFAQWhat is a fuel flow meter?(Best Price) Turbine flow meter Read More
Contents Featured Micro flow meters for SaleUltrasonic flow meter for Micro flowTurbine Micro flow meterMicro motion flow meterHow does micro motion flow meter work?Gear flow meter for Micro Flow(Best Price) Turbine flow meter manufacturers(Best Price) Magnetic Flow Meter ManufacturersUltrasonic flow Read More
Contents Best clamp-on flow meters for saleClamp-on flow sensor for clamp-on flow metersPortable clamp-on flow metersNew Strap on flow meter X3Clamp on flow meters for waterClamp on flow meter for gasIndustrial petrol flow meters|Selection GuideCheap flow meters-Low Cost measurement solutionsDigital Read More
Contents Difficulties in the measurement of chemical liquids/gasesChemical flow meters typesCorrosive chemical flow metersCorrosive gas chemical flow metersLow corrosive chemical flow metersLow flow rate-chemical flow metersHigh viscosity chemical flow metersCorrosive but non-conductive liquid flow metersFeatured mechanical & digital chemical flow Read More
Contents What is a Karman vortex air flow sensor?What is a mass air flow sensor ?Karman vortex air flow sensor VS Mass air flow sensorMore Featured Air flow sensors Karman vortex air flow sensor is a commonly used flow meter Read More
Contents Featured Cryogenic Flow MetersCryogenic Turbine Flow MeterCryogenic Mass Flow MeterOrifice flowmeter for cryogenic fluidOrifice flowmeter for cryogenic fluidCryogenic fluidsHow does a cryogenic flow meter work? Cryogenic Flow Meters for Highly Accurate and Reliable Cryogenic Fluids Flow Mesaurement. Featured Cryogenic Read More
Contents Featured Sanitary Flow Meters for SaleSanitary Turbine Flow MeterSanitary Magnetic Flow MeterSanitary Metal RotameterSanitary Differential Pressure FlowmeterSanitary Slurry Flow MeterTri Clamp Flow Meter3A Sanitary Flow MetersClamp-on flowmeter for sanitary industryFAQWhere should a flow meter be placed?What does a flow Read More
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.
Request a Quote
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.