Industrial Inline Air Flow Meters

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

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.

Extended Reading: Digital air flow meters

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.

More about Types Of Air Flow Measurement Instruments.

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

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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;

Extended reading: Gas Rotameter Tips

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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About KimGuo11

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.