Karman vortex air flow sensor is a commonly used flow meter for measuring air. Karman vortex air flow sensor is also called vortex shedding flow meter.
There are many types of instruments that can be used to measure air, but the actual air flow rate used in the field is divided according to its principles, and there are not many types. Karman vortex air flow sensor and Mass air flow sensor are two commonly used.
Which one should you choose?
What is a Karman vortex air flow sensor?
Karman vortex air flow sensor is a volume flow meter.
Karman vortex air flow sensor uses airflow to bypass a cone and generate two rows of vortices downstream. The vortex frequency has a functional relationship with the intake air flow. An instrument that determines the air flow by detecting the frequency of the vortex by optical or ultrasonic methods.
What is a mass air flow sensor ?
The mass air flow sensor is a mass flow meter. Also called Thermal gas mass flow meters.
Thermal gas mass flow meters are instruments that use the principle of thermal diffusion to measure gas flow. The sensor is composed of two reference thermal resistance (RTD).
Thermal gas mass flow meter can measure air, nitrogen, carbon dioxide, methane, etc.
A single component or a mixture of certain components. The flowmeter is generally verified with ammonia or air as the medium when it leaves the factory.
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Karman vortex air flow sensor VS Mass air flow sensor
|Measurement Principle||Through measuring frequency of|
turbulences behind an obstacle to
reflect the velocity of the gas, so
measures the actual volume flow of
the gas .
|Measures the mass flow of the gas|
via measuring the energy
needed to keep a heated resistor
at a constant temperature.
|Temperature and Pressure Compensation||To calculate the standard volumetric flow , need temperature and pressure compensation . ( Requires temperature and pressure measurement additionally )||There is a fixed relationship|
between standard flow and mass flow (Be determined by the density of gas under standard condition ) , no need the temperature and pressure compensation.
|Sensitivity||No response to the flow less than 4 m/s.||Can measures the flow small to 0 m/s.|
|Measure Ranges||4-75 m/s||0-224 m/s|
|Main factors affecting measurement accuracy||vibrate(a slight shaking can affect the measuring accuracy a lot)||The cleanliness of the measured gas (No long-term measurement behind the air compressor)|
|Can not install or uninstall under pressure, high cost of repair or calibration.||Can install or uninstall under pressure,low cost of repair or calibration.|
The Karman vortex air flow sensor is widely used, gas, liquid, and steam can be measured.
The Mass air flow sensor can only measure gas;
Karman vortex air flow sensor is much cheaper;
The vortex flowmeter has requirements for the installation of the straight pipe section of the measuring pipeline, generally the first 10 and the back 5.
The thermal mass flow meter has no limitation.
- Thermal gas mass flow meters have the following technical advantages:
A true mass flow meter does not require temperature and pressure compensation for gas flow measurement. The measurement is convenient and accurate. The gas mass flow or standard volume flow can be obtained.
Wide range ratio, can measure gas with flow rate as high as 120Nm/s and as low as 0.1Nm/s. Can be used for gas leak detection.
Good seismic performance and long service life. The sensor has no moving parts and pressure sensing parts, and is not affected by vibration on measurement accuracy.
Easy to install and maintain. If site conditions permit, installation and maintenance can be achieved without stopping production. (Need special customization)
Digital design. Integral digital circuit measurement, accurate measurement and convenient maintenance.
Using RS-485 communication can realize factory automation and integration.
Oxygen, nitrogen, hydrogen, road gas and multi-component gas measurement.
Blast furnace gas and coke oven gas measurement.
Gas flow measurement for natural gas, liquefied gas, flare gas, etc.
Primary air and secondary air flow measurement of power plant blast furnace.
Flow measurement of underground ventilation or exhaust system in mines.
Flue gas measurement.
Compressed air measurement.
- The vortex flowmeter has the following advantages:
The output signal is not affected by the temperature, pressure, and density components of the fluid, and is directly proportional to the fluid flow rate.
The sensing element does not contact the medium and has high reliability.
No moving parts, simple and firm structure.
Wide measuring range and high precision.
The pressure loss is small and the energy saving is significant.
Read more about: Vortex Shedding Flow Meter Working Principle
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