What is air flow meter?

An Air Flow Meter is the flow meter that measures industrial air velocity. Most of the time, people talk about air flow meters means compressed air flow meters. We are discussing here all air flow meters, including compressed air flow meters.

Industrial Inline Air Flow Meters

Vortex Flow Meters
Vortex Flow Meters

Compressed Air Flow Meter, is the digital flow meter work for the air compressor. Air consumption is important info for industrial inline gas flow pipes. According to the measurement conditions, a compressed air flow meter could be of different types. Thermal mass flow meters, Ultrasonic flow meters, vortex flow meters, Turbine flow meters. And the differential pressure flow meters (Orifice plate ) are also suitable for compressed air. With the Pressure and Temperature compensation. Sino-Inst’s compressed air flow meters are more affordable and complete.

There are many types of instruments that can be used to measure air. However, there are not many types of airflow actually used in the field according to their principles. The most important ones are rotameter, throttling differential pressure flowmeter, vortex flowmeter, gas turbine flowmeter, and averaging velocity tube flowmeter.

Featured Inline Air Flow Meters

Air flow meters types

The Carmen vortex refers to the placement of a cylindrical or triangular object in the fluid. Two rows of vortices with opposite rotation directions will be generated downstream of this object.

An ultrasonic transmitting probe and a receiving probe are oppositely installed on both sides of the downstream pipeline of the Carmen vortex generator. Due to the influence of the Carmen vortex on the air density, the time from the transmitting probe to the receiving probe of the ultrasonic wave becomes later than that of the non-vortex and a phase difference occurs. By processing this phase signal, a vortex pulse signal can be obtained.

The working principle of the hot film type air flow meter is similar to that of the hot wire type air flow meter, and they all work with Wheatstone bridge. The difference is that the hot film type does not use platinum wire as a hot wire. But uses a thick film process to make the hot wire resistance, compensation resistance, and bridge resistance on the same ceramic substrate.

In the process of generating the Carmen vortex, the air pressure on both sides of the vortex generator will change. The pressure acts on the metal foil through the pilot hole, causing it to vibrate. When light from a light-emitting diode strikes a vibrating metal foil. The reflected light on the metal foil received by the phototransistor is vortex-modulated light. And its output is demodulated to obtain a frequency signal representing the air flow.

When no air flows, the bridge is in equilibrium. The control circuit outputs a certain heating current to the hot wire resistance RH. When there is air flowing, the heat of RH is absorbed by the air and becomes cold. Its resistance value changes. The bridge loses Balance. If the temperature difference between the hot wire resistance and the intake air is kept constant and constant, the current IH flowing through the hot wire resistance must be increased. Therefore, the hot-wire current IH is a function of the mass air flow.

The vane type air flow meter has a simple structure and high reliability. Yet, it has a large volume, large intake resistance and slow response.

Read more about: Beginner’s Guide: Variable area flow meter

Inline air flow meter cfm-scfm-lpm

Inline air flow meter cfm

CFM is a common imperial flow unit, cubic feet per minute.
For a certain volume of air flow passing in a unit time, m3/h air volume unit is generally used in China. Other countries also use the British air volume unit cfm (cubic foot per minute). That is ft3/min cubic feet/minute,
1CFM=28.316846592 L/MIN=0.028316847 m3/min

CFM traffic is divided into SCFM and ACFM.

Inline air flow meter scfm

SCFM English standard cubic foot per minute means standard cubic foot per minute, British flow unit. Both ACFM & SCFM are units of measurement for English flow
ACFM=actual flow rate ft^3/min

SCFM=standard flow rate ft^3/min

1 cubic meter = 35.314724827664 cubic feet
1Nm^3/min=35.315 SCFM
1 liter/minute=0.03531SCFM
1 liter=0.03531SCFM

Inline air flow meter lpm

LPM is liter/minute.

Read more about Inline air flow meter units conversion

More Air Flow Meters solutions

Digital air flow meters

First, We recommend a small digital airflow meter for you. Also called a portable gas mass flow meter. MF5700 series. MF5700 series portable gas mass flow meter is a digital air flow meter developed based on MEMS flow sensor chip. Read More

Air mass flow meter VS Controller

Related products What is a mass flow meter? Air mass flow meter, namely Mass Flow Meter (abbreviated as MFM). It is an instrument for accurately measuring gas flow. The measured value is not inaccurate due to temperature or pressure fluctuations. Read More

Inline Air Flow Meters

Featured Inline Air Flow Meters Inline air flow meter units conversion Inline air flow meter cfm CFM is a common imperial flow unit, cubic feet per minute.For a certain volume of air flow passing in a unit time, m3/h air Read More

Vortex Compressed Air Flow Meter

Compressed air flow meter is a upgraded and improved gas vortex flow meter. The karman vortex air flow sensor is researched and produced according to the Karman vortex principle. Features of Vortex Compressed Air Flow Meter Easy to install. Suitable Read More

Compressed Air Flow Meter

Compressed Air Flow Meter, is the digital flow meter work for the air compressor. Air consumption is an important info for industrial inline gas flow pipe. According to the measurement conditions, compressed air flow meter could be different types. Thermal Read More

Gas mass flow controller

Liquid mass flow controller for process liquid -Sino-Inst Related Tools DP Flow Meter Output Calculator Flow Meter 4-20mA Current Output Calculator Flow Velocity & Pipe Diameter to Volumetric Flow Rate Calculator Mass Flow & Density to Volume Flow Calculator Mass Read More

2 inch Water Flow Meter

2 inch water flow meter also written as 2″ flow meter. If you are planning to buy a 2 inch water flow meter, please be sure to read this article. How much is a 2 inch water flow meter? And Read More

Digital gas flow meters for Sale

Digital gas flow meters are flow meters used to monitor the gas flow rate or mass. Digital gas flow meters are designed to measure different types of gases. Like Air, N2, O2, CO2, and more. Featured Digital gas flow meters Read More

Industrial Oxygen Flow Meters

Oxygen Flow Meters are digital flow meters that can measure industrial oxygen. It is very important to choose a suitable flow meter to measure and monitor the oxygen flow. Featured Industrial Oxygen Flow Meters for Sale Extended reading: Flow Totalizer Read More

Industrial CO2 flow meters

CO2 flow meters are instruments that can measure the flow of gaseous or liquid carbon dioxide. CO2 is a common industrial gas, and effective measurement is very important. CO2 gas flow meter Precession Vortex Gas Flowmeter, like a vortex flowmeter, Read More

Biogas Flow Meters Selection Guide

Biogas Flow Meters are instruments that can measure the flow of biogas. Could be a vortex flow meter, thermal mass flow meter, etc. Commonly used in biogas stations, biogas production fermentation tanks, etc. Featured Biogas Flow Meters Purpose of biogas Read More

LPG flow meters

LPG flow meter is used for flow measurement of liquefied petroleum gas. The flow measurement of LPG is very important in industrial production, transportation and trade settlement. Featured LPG Flow Meters for Sale Features of LPG LPG refers to petroleum Read More

Air flow meter price

The price of AIR flow meters are decided by flollowing factors:

  • Pipe diameter;
  • Flow range;
  • Measured medium;
  • Whether it is corrosive;
  • Whether explosion protection is required;
  • Whether it needs local display;
  • Connection method;
  • Measure pressure;
  • Measure temperature;
  • Signal output;
  • Accuracy requirements;
  • Material requirements;

Important factors when selecting flow metering devices are

  • accuracy
  • cost
  • legal constraints
  • flow rate range
  • head loss
  • operating requirements
  • maintenance
  • lifetime

These factors are more or less related to each other. Example – the cost of flow meters increases with accuracy and lifetime quality.


What is an air flow meter called?

An airflow meter is a device that converts the inhaled airflow into electrical signals. Airflow meter is also often called gas flow meter, air mass flow meter, compressed air flow meter, etc.
Know more about Air flow meter From Wikipedia.

Sino-Instrument offers over 50 flow meter for flow measurement.

About 50% of these are differential pressure flow meters, 40% are the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meter.

A wide variety of flow meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

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