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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.

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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

**Rotameter flow meter-Variable Area 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

Convert
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

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.

FAQ

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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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.

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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 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.

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Featured Compressed Air Flow Meter

Compressed air flow meter working principle

There are a variety of measurement principles can be used to measure compresses gas.

Turbine gas meters are robust meters, used to measure gas consumption. In gas distribution, transmission, industrial plants and for commercial users. The meter tracks the flow rate continuously, offers little resistance to flow, and has a unique cartridge design that allows removal of all internal parts as one assembly.The meter also exhibits little sensitivity to gas density above two atmospheres pressure.The low inertia of the rotor and vee bearings, allows overhanging of the meter to twice its rated capacity, without damage for intermittent flow variations. Orifice plates and venturi tubes rely on detecting the differential pressure across a restriction in the pipe,and this pressure is directly proportional to the media velocity. Given knowledge of the pipe dimensions and media characteristics,a differential pressure instrument can give a reading directly in flow units. The accuracy of these systems are reliant on very fine tolerance machining of the orifice or venturi and the pressure drop incurred,through the installation of these devices may not suit all situations. These can be highly accurate and reliable but are expensive and complicated to install and maintain. Pitot tube systems work on a very similar principle and remove the issue of the pipe restriction,as there is only a small diameter tube inserted at right angles to the flow. These can be inserted through ball valves, making removal for service or calibration very simple. This method does not need perfectly dry and pure gases to be accurate,and is very tolerant of wet gases and contaminants which makes it ideal for measuring in difficult places. Such as compressor outlets. Vortex meters place a bluff restriction in the pipe,that causes vortices to form alternately on the 2 rear edges. Sensors are used to detect the formation of these vortices, the frequency of which is directly proportional to the flow rate. These instruments are accurate but again introduce a large restriction into the pipe,and are often employed on steam applications.

Extended Reading: Digital air flow meters

What about Thermal Mass?

Thermal mass meters and calorimetric flow sensors sense the cooling effect on a heated element,which is directly proportional to the mass flow rate rather than the volumetric flow rate. This removes the subsequent calculations needed to determine mass flow rate,using other methods of flow measurement, and there is no pressure or temperature compensation necessary.The actual sensing tips are small and thus the restriction placed,in the pipe produces very little back pressure, making this method ideal for very low and very high flow rates.Thermal mass meters are available in a range of accuracies and are ideal for dry, clean gas flow measurement. Some designs have all stainless steel wetted parts making them better suited to contaminated or corrosive gases,which would damage the exposed sensing elements of unprotected designs. They are not suitable for wet gases or steam. For those applications a pitot tube design or possibly a vortex meter would be the better choice. Thermal mass is also an excellent principle for use in flow switches,as there are no moving parts in the media and the sensor produces very little back pressure due to its minimal size. These flow switches are very sensitive and some models can be used to determine flow direction as well as flow/no flow.

Know More about Flow Meters

Gas mass flow meter

Gas mass flow meter, are the thermal mass flow meter, which is best choice for gas flow rate measurement. Based on the principle of thermal diffusion, Gas mass flow meter measure the flow rate of gas. Like: air flow, nitrogen, natural gas flow rate.

Digital water flow meters

Digital Water flow meter, means flow meter that can display water flow rate, and have the output for the flow rate. Like 4-20mA output, HART, RS 485, and so on.

Nitrogen flow meter

Nitrogen Flow Meter, is the flow meter that can measure the flow rate of nitrogen gas. Sino-Instrument is the nitrogen flow meter supplier in China. Vortex flow meter, is the common choice for gas flow rate inline measurement instrument. Like the air, nitrogen gas, steam, oxygen…..

Sino-Instrument is a well-known Exporter, Supplier,

Trader and Service Provider of Flow Measurement Instrument,

LEVEL METERS, PRESSURE TRANSMITTERS, AMR Solution, etc.

Our presented products are used in commercial places for various purposes.

These products are extremely admired in the market due to their reliable performance,

compact design, sturdy nature, easy to fit, longer operational life,

low maintenance, and low prices.