The specific parameters of the gas flow meter, what is the gas flow meter unit

A gas flow meter is an instrument used to measure the flow rate of gases. They can be used to measure a variety of gases, including air, oxygen, nitrogen, hydrogen, carbon dioxide, and more. Gas flow meters typically use a pressure sensor or flow sensor to measure the gas flow rate, and the measurement results can be displayed through a digital display or output signal.

The gas flow meter unit is CFM

CFM (cubic feet per minute) is a unit of flow, cubic feet per minute, which refers to the volume of air that the filter passes through per unit of time.

1cfm=。

The volume of air flow through which the filter passes through a unit time is generally expressed in M3 h air volume units in China, and in foreign countries, it is also expressed in the British air volume unit CFM (cubic foot per minute), that is, FT3 min cubic foot minutes, and the two are converted to: 1cfm.

Gas Flow Meter Principle:

Thermal gas mass flow meters use the principle of thermal diffusion, which is a technology with excellent performance and high reliability under harsh conditions. A typical sensing element consists of two thermal resistance (platinum RTDs), a velocity sensor and a temperature sensor that automatically compensates for changes in gas temperature.

When two RTDs are placed in a medium, the velocity sensor is heated to a constant temperature above the ambient temperature. Another temperature sensor is used to sense the temperature of the medium. The mass flow of gas through the velocity sensor is calculated by the amount of heat transferred by the sensing element.

As the gas velocity increases, the amount of heat taken away by the medium increases. This lowers the temperature of the sensor. In order to keep the temperature constant, the operating current through the sensor must be increased, and the magnitude of this increased current is proportional to the flow rate of the medium.

1. Introduction to air flow meter.

The role of the air flow meter.

The air flow meter measures the amount of fresh air entering the engine intake manifold and the intake air temperature, and the ECU uses this information to make injection corrections, smoke limits, and EGR opening control.

2.Installation location.

The sensor is mounted on the engine intake duct and at the rear end of the air filter.

3.How it works.

The principle of an air flow meter.

The air flow sensor is to integrate some electronic components on a ceramic substrate, when the engine is working normally, the diaphragm is first heated, and the fresh air flows through the sensor will take away part of the heat, at this time the ECU will control the Wheatstone bridge on the diaphragm to supplement the diaphragm, which will cause a change in the electrical signal, when the signal is transmitted to the ECU, the ECU will calculate the air intake according to this change.

The principle of the air temperature sensor.

The inlet air temperature sensor is a negative temperature coefficient resistor, when the inlet air temperature changes, the resistance value of the resistor will change, causing a change in the signal voltage at the ECU terminal, and the ECU calculates the inlet air temperature based on this change.

Determination of the direction of the airflow.

There is a same temperature resistance at both ends of the hot film of the air flow meter, and when the air flow flows through the hot film, it will take away part of the heat, so the temperature at the front end of the hot film is lower than the temperature at the rear end, and the ECU judges the direction of the air flow according to this signal!

4.Wiring diagram of an air flow meter.

5.Control policy.

The ECU will monitor the working condition of the air flow meter at all times, and when the ECU judges that the air flow meter is faulty, it will take corresponding control, as follows.

The engine mil light is lit, the EGR system is withdrawn from work, and the exhaust gases will no longer participate in the system work;

The engine speed will be limited to a certain speed, and the power will be limited;

When the air flow meter fails, the engine start is not affected and can be started normally;

Second, the detection of air flow meter:

Fault codes related to air flow meters

There are many types of flow meters that measure gases.

Commonly used are: orifice plate, deltaba, A+K, V cone, ultrasound.

There are many types of flow meters that measure gases.

Commonly used are; Vortex Street.

Well plate V-cone. LFX shunt rotor flow meter and much more.

Electronic gas flowmeter parameters: 1. Measurement accuracy: In general, the measurement accuracy is required to reach the highest level.

2. Working temperature: The working temperature should be between -40 +65 and up to +85. 3. The source voltage of the electric marketing town:

In general, the input voltage should be between 12V and 24V, and the maximum achievable resolution is SLPM percentage. 5. Working pressure:

7. Anti-interference ability: The anti-interference ability should meet the standard requirements of the electromagnetic and travel capacity (EMC) standard. 8. Anti-vibration performance:

The vibration resistance should meet the requirements of the MIL-STD-810F specification. 9. Impact resistance: The impact resistance should meet the requirements of MIL-STD-810F specification.

10. Protection level: The protection level should reach IP65 or higher.

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Pro-1 Basic parameters: Table 1 Instrument caliber and connection method Flange connection can be used Threaded connection 2 Accuracy and other imaginary level range ratio 1:10;1:

20；1:304 Display mode: Widescreen display simultaneously displays instantaneous flow, daily cumulative flow, total cumulative flow, temperature, pressure, time, date, battery level5 Instrument Burning Material: 304 stainless steel; Impeller:

Anti-corrosion ABS or high-quality aluminum alloy; Display: cast aluminum 6 measured medium temperature ( ) 30 +80 7 environmental conditions medium temperature: -30 +80 , relative humidity 5 90 , atmospheric pressure 86 106kpa8 communication signal three-wire system working condition pulse, three-wire system standard condition pulse, three-wire system 4-20mA, RS485 protocol, IC card signal 9 power supply built-in lithium battery, external supply 24VDC dual power supply 10 transmission distance 1000m, I hope mine can help you <>

Do you have any other questions?

The selection of gas flowmeter is in accordance with the production requirements, and should be based on the actual situation of the instrument product, and comprehensively consider the way to determine the bright sampling device and the form and specifications of the gas flowmeter.

According to the characteristics of the measured medium, a reasonable measurement method is selected, and according to the special parts of the measured medium and the accuracy requirements of the measurement accuracy, the plug-in flowmeter, the speed measuring element with differential pressure meter, the ultrasonic flowmeter, or the non-lossless method such as marking method and simulation method are used to measure the flow rate. Pay attention to the shockproof requirements of the gas flow meter and choose the specifications of the gas flow meter correctly.

The pressure resistance of the gas flowmeter should be slightly greater than the working pressure of the measured medium, and it should be doubled. Ensure that the gas flow meter will not leak.

Gas Flow Meter Applications:

Flow meter is one of the large categories of instruments and devices in process automation, it is widely used in metallurgy, electric power, coal, chemical industry, petroleum, transportation, construction, textile, food, medicine, agriculture, environmental protection and people's daily life and other fields of the national economy, is the development of industrial and agricultural production, energy saving, to improve product quality.

An important tool for improving economic efficiency and management level, it occupies an important position in the national economy. In process automation instruments and devices, flow meters have two major functions: as a detection instrument for process automation control systems and as a total meter for measuring the quantity of materials.

Hello, I am Xiao Su, I am happy to answer for you, dear, gas flow meter is an instrument used to measure gas flow, widely used in industry, medical, environmental protection and other fields. When selecting a model, the following aspects need to be considered:1

Measurement range: According to the actual needs to choose the appropriate measurement range of the index, generally should be slightly larger than the actual use range. 2.

Measurement accuracy: Choose the appropriate measurement accuracy according to the actual needs, which should generally be slightly higher than the actual requirements. 3.

Measuring medium: choose the appropriate gas flowmeter according to the actual use of the medium, and the flowmeter of different media has different scope of application. 4.

Working pressure: Choose the appropriate gas flowmeter according to the actual working pressure, which should generally be slightly higher than the actual working pressure. 5.

Working temperature: Choose a suitable gas flowmeter according to the actual working temperature, which should generally be slightly higher than the actual working temperature. 6.

Environmental conditions: Choose the appropriate gas flowmeter according to the actual environmental conditions, such as explosion-proof, anti-corrosion and other special requirements. 7.

**And brand: according to the actual budget to choose the right gas Weiwufeng flowmeter brand and**, generally should choose well-known brands and reasonable products. To sum up, the selection of gas flowmeter needs to be comprehensively considered according to the actual needs and conditions, and the appropriate product can be selected to meet the actual use requirements.