Try to compare the advantages and disadvantages of various air flow meters

1. Vane air flow meter: advantages: simple principle. Disadvantages: Obstruction of air intake. The signal changes slowly.

2. Measuring core: advantages: none. Disadvantages: There is air intake resistance, the signal is not accurate.

The above two have been eliminated.

3. Carmen. Eddy current type: Advantage: It can directly generate digital signals.

Received by the computer. The signal is precise. Disadvantages: complex structure, high manufacturing cost.

4. ** type: advantages: low cost, accurate signal. Fast response. Disadvantages: Only analog signals can be generated.

If the computer receives it, it will also convert the signal.

Kármán vortex air flow meter

The so-called Kármán vortex refers to the placement of a cylindrical or triangular object in a fluid, and two columns of vortices with opposite rotation directions and alternating appearances will occur downstream of the object.

Optical Carmen vortex air flow meter

In the process of generating the Kármán vortex, the air pressure on both sides of the vortex generator will change, acting on the metal foil through the guide hole, so that it vibrates, when the light of the light-emitting diode is illuminated on the vibrating metal foil, the reflected light on the metal foil received by the phototransistor is the light modulated by the vortex, and its output is demodulated to obtain a frequency signal representing the air flow.

Ultrasonic Kármán vortex air flow meter

In the Kármán eddy current generator, the downstream tubing sides are chaotic and do not have an ultrasonic emission probe and a receiver probe installed. Due to the influence of the Kármán vortex on the density of the air, the ultra-louder sound wave will be sent from the transmitting probe to the receiving probe later than the non-vortex change, resulting in phase difference. By processing this phase signal, a vortex pulse signal can be obtained.

** Air Flow Meter Working Principle

When there is no air flow, the bridge is in equilibrium, and the control circuit outputs a certain heating current to the first resistance rh; When there is air flowing, because the heat of RH is absorbed by the air and becomes cold, its electric width resistance value changes, the bridge is out of balance, if the temperature difference between the resistance and the inhaled air is kept unchanged and a certain value, it is necessary to increase the current IH flowing through the resistance. Therefore, the current IH is a function of the air quality flow.

Hot-film air flow meter

The working principle of the hot film air flow meter is similar to that of the ** type air flow meter, which works with the Wheatstone bridge. The difference is that the hot film type does not use platinum wire as the first grade, but makes the first resistor, compensation resistor and bridge resistor on the same ceramic substrate with a thick film process.

Vane air flow meter

The blade type air flow meter has a simple structure and high reliability; However, it is larger in size, has high intake resistance, and responds slower.

The ECU of the electronically controlled fuel injection system has a fault storage function, which summarizes the working conditions of each sensor and actuator, and compares it with the fixed program stored in the computer, if its error exceeds the specified range, it is stored as a fault, and the maintenance personnel can read the specific fault situation through the fault reader (detector).

Millions of car purchase subsidies.

The empty flow blockage cannot be started.

Unplugged vehicle starts.

Multi-purpose naturally aspirated cart with air flow meter.

and Shunda vortex flowmeter parameters.

Measuring medium: gases, liquids, vapors.

Connection: flange card mounting, flange type, plug-in type.

Caliber specifications Flange card mounted calibers are 25, 32, 50, 80, 10

Flange connection type caliber selection 100, 150, 200 ABGUG vortex flowmeter working principle.

Flow measurement range Normal measurement flow velocity range Reynolds number; gas 5 50m s; Liquid.

Normal Measurement Flow Range The flow measurement range of liquids and gases is shown in Table 2; The vapor flow range is shown in Table 3

Measurement accuracy level.

Medium temperature to be measured: room temperature 25 100

High temperature 25 150 -25 250

Output Signal Impulse voltage output signal High level 8 10V low level.

The pulse duty cycle is about 50%, and the transmission distance is 100m

Pulse current remote signal 4 20 mA, transmission distance of 1000m

Instrument operating environment Temperature: -25 +55 Humidity: 5 90% rh50

Material: Stainless steel, aluminum alloy.

Power supply: DC24V or lithium battery.

Explosion-proof grade: intrinsically safe IAIIBT3-T6 protection class IP65

Heshunda vortex flowmeter is a volumetric flowmeter that measures the volumetric flow rate of gas, vapor or liquid, the volume flow rate or the mass flow rate of standard conditions according to the Karman vortex principle. It can also be used as a flow transmitter in an automated control system.

Fin type, measuring core type, Kalman eddy current type, ** type and hot film type, etc.

There are thermal type, differential pressure type, different principles and different processing methods, which are also related to your use environment!

1. Vane air flow meter: advantages: simple principle. Disadvantages: Obstruction of air intake. The signal changes slowly.

2. Measuring core: advantages: none. Disadvantages: There is air intake resistance, the signal is not accurate.

The above two have been eliminated.

3. Carmen eddy current type: advantages: it can directly generate digital signals to be received by the computer. The signal is precise. Disadvantages: complex structure, high manufacturing cost.

4. ** type: advantages: low cost, accurate signal. Fast response. Disadvantages: Only analog signals can be generated, and the computer has to convert the signal when it receives it.

The air connections that belong to the mass flow type mainly include:

1. Plug-in thermal gas mass flow meter, 2. Split gas mass flow meter, 3. Temperature and pressure compensation gas mass flow meter

Thermal gas mass flow meter, the most professional flow meter for measuring gas, but the air requirement does not contain water is the most ideal, you can learn about Shanghai Huaqiang's hot gas.

Thermal mass flow meters and laminar differential pressure mass flow meters. Hope you have a reward.

Three 1s;**Type Air Flow Meter 2;Hot-film air flow meter 3;Light-sensitive Kármán vortex air flow meter.

An air flow meter is a device that measures the amount of air intake into an engine and is used in L-type injection systems.

The air flow meter is installed between the air filter and the throttle body, and some are mounted on the air filter, and some are integrated with the throttle body and installed on the engine.

The air flow signal is one of the main bases used to determine the basic fuel injection volume. According to its structural form, it can be divided into the following four types:

Fin-type air flow meter, which is a volumetric flow type. It was more popular in the 70s of the 20th century.

The Carmen vortex air flow meter, which is a volumetric flow type, is mostly seen in Mitsubishi and Toyota vehicles.

** type air flow meter, for the mass flow type, developed in the early 80s of the 20th century, now widely used.

Thermal film air flow meter, for the mass flow type, developed by General Motors of the United States, is mostly used in the cars produced by General Motors and Isuzu Corporation of Japan, and the electronically controlled fuel injection engines produced in China are also widely used.

There are many types of air flow meters, among which the two most commonly used at the moment are one that is normal, one is flow to flow metering, and the other is some, well, the target is the seventh floor dosimeter.

There are many types of air flow meters, among which there are two types of air flow meters, including vacuum suitability and non-vacuum.

The calculation of air flow can be related to the speed of your flow and the intensity of the air flow.

There are many types of air flow meters, among which the two most commonly used are? English.

There are many types of air flow meters, among which there are two types of xylose ears and fat tea.

At present, the two most commonly used words, I think it must be based on the collection of data, as well as professional equipment.

There are many of the most commonly used types of information, and I don't know what they are.

There are many types, of which there are two of the most commonly used at present.