Sika VT1541MELTEC02 flow sensor

Sika VT1541MELTEC02 flow sensor

Sika VT1541MELTEC02 flow sensor

In order to obtain the optimal concentration of the mixture under various operating conditions, the electronic control gasoline injection engine flow sensor must accurately measure the amount of air inhaled into the engine at each moment, which serves as the main basis for ECU calculation (control) of fuel injection quantity. If the air flow sensor or circuit malfunctions and the ECU cannot receive the correct intake signal, it will not be able to control the fuel injection amount normally, which will cause the mixture to be too rich or too lean, resulting in abnormal engine operation.

Working principle of flow sensor

The basic principle and type of ultrasonic flowmeter: When ultrasonic waves propagate in a flowing fluid, they carry information about the fluid velocity. Therefore, by receiving ultrasonic waves, the flow velocity of the fluid can be detected and converted into flow rate.

According to the detection method, ultrasonic flow meters can be divided into different types such as propagation velocity difference method, Doppler method, beam offset method, noise method, and correlation method. Acoustic flowmeter is a non-contact instrument that has only been applied in the past decade with the rapid development of integrated circuit technology. It is suitable for measuring fluids that are difficult to contact and observe, as well as large pipe flow rates. It can be linked with a water level gauge to measure the flow of open water. The use of ultrasonic flow rate does not change the flow state of the fluid and does not generate additional resistance, as it does not require the installation of measuring elements in the fluid. The installation and maintenance of the instrument do not affect the operation of the production pipeline, making it an ideal energy-saving flowmeter

Industrial flow measurement commonly faces the problem of difficulty in measuring large pipe diameters and large flow rates. This is because general flow meters face manufacturing and transportation difficulties as the measuring pipe diameter increases, resulting in increased cost, energy loss, and installation. Ultrasonic flow meters can avoid these disadvantages. Because various types of ultrasonic flow meters can be installed outside the pipeline for non-contact flow measurement, the cost of the instrument is basically independent of the size of the measured pipeline diameter. However, the cost of other types of flow meters increases significantly with the increase of diameter. Therefore, the larger the diameter, the more cost-effective the ultrasonic flow meter is compared to other types of flow meters with the same function. Considered a good instrument for measuring large pipe diameter flow, the Doppler method ultrasonic flowmeter can measure the flow of two-phase media, making it suitable for measuring dirty and dirty flows such as sewers and sewage. In the power plant.

The function of flow sensors

The application in China has a history of nearly 30 years and is widely used in the mid to high end market. As an important component of the pneumatic system, it is responsible for converting the flow rate of inhaled and exhaled gases into electrical signals, which are sent to the signal processing circuit to complete the detection and display of inhaled and exhaled tidal volume, minute ventilation volume, and flow rate.

According to different functions and designs, the detection value of flow sensors not only provides display, but also plays a decisive role in control, alarm, etc. For example, flow sensors feed the measured actual value to the electronic control part for comparison with the panel setting value, and use the error between the two to control the servo valve to adjust the inhalation and exhalation gas flow rate; The signals generated by the air and oxygen flow sensors installed at the front end of the inhalation system can help the microprocessor control the valves to provide the patient with the required oxygen concentration; The detection values of flow rate and flow rate also directly affect the switching between exhalation and inhalation phases, the alarm of upper and lower limits of minute ventilation, the sensitivity of flow triggering, the real-time waveform of airflow, and the monitoring and display of P-V loop. The performance of flow sensors directly affects the accuracy and reliability of parameters.

technological innovation

The global sensor market is showing a rapid growth trend amidst constantly changing innovations. Experts point out that the main technologies in the field of sensors will be extended and improved on the existing basis, and countries will compete to accelerate the development and industrialization of the new generation of sensors, and competition will become increasingly fierce. The development of new technologies will redefine the future sensor market, such as the emergence and expansion of new sensors such as wireless sensors, fiber optic sensors, smart sensors, and metal oxide sensors.

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