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ALRE sensor is a sensor that measures the air flow drawn into the engine. For electronically controlled gasoline injection engines, in order to obtain the optimal mixture concentration under various operating conditions, it is necessary to accurately measure the amount of air drawn into the engine at every instant, using this as the main basis for the ECU to calculate (control) the fuel injection quantity. If the air flow sensor or wiring fails, the ECU will not receive the correct intake air signal and cannot properly control the fuel injection quantity, resulting in a mixture that is too rich or too lean, causing abnormal engine operation.

ALRE sensor features

Currently, baffles can be designed according to the water flow rate to reduce the water resistance generated when water flows through the flow sensor, thereby reducing head loss in the water system. However, due to long-term impact from water flow, baffle-type sensors still suffer from fatigue issues; even if the flow value is calibrated at the factory, setpoint drift may occur. They are typically used in applications where precise protection of flow values is not required, i.e., for break-flow protection against sudden interruption of water flow in pipes. In China, there are very few designs specifically for water-source heat pump units. The baffle type is specifically developed for water flow monitoring in water-loop/ground-source heat pump air conditioning units. It is equipped with different baffles for different pipe diameters, and the water resistance of each baffle does not exceed 0.5 meters of water column, which is significantly lower than that of target-type sensors. Each baffle-type flow sensor is equipped with pipe fittings identical to those of the water-loop heat pump unit's water pipes. On-site installation only requires connecting to the water pipe without any modification to the baffle. Additionally, the pressure rating of the baffle-type water flow switch is greater than 25bar, making it a low-cost water flow switch for water-loop heat pump units with less stringent water flow requirements. Feedback from use on water-loop/ground-source heat pump units indicates that differential pressure switches can effectively identify problems in the on-site installation of water piping for water-loop heat pump units, completely avoiding heat exchanger freeze-up caused by low water flow. Flow sensors can also protect against heat exchanger freeze-up due to reduced water flow caused by clogged water filters. Furthermore, water pipe differential pressure switches do not carry the risk of fatigue failure associated with target flow switches. Especially when there is a small amount of air in the water piping, the flow sensor operates very stably without floating issues similar to those seen in target flow switches. Feedback from years of use has not revealed any failures of the differential pressure switch itself.

ALRE sensor principle

Basic principles and types of ultrasonic flowmeters: When ultrasonic waves propagate in a flowing fluid, they carry information about the fluid's flow velocity. Therefore, by receiving the ultrasonic waves, the fluid's flow velocity can be detected and converted into flow rate. Based on the detection method, ultrasonic flowmeters can be classified into different types such as transit-time difference method, Doppler method, beam deflection method, noise method, and correlation method. Ultrasonic flowmeters are non-contact instruments that have come into application only in the last decade or so with the rapid development of integrated circuit technology. They are suitable for measuring fluids that are difficult to contact and observe, as well as large-diameter pipe flows. When linked with level gauges, they can measure flow in open channels. Using ultrasonic flow measurement means no measuring elements need to be installed in the fluid, so the fluid's flow state is not altered, no additional resistance is generated, and instrument installation and maintenance do not affect the operation of production pipelines, making it an ideal energy-saving flowmeter. Industrial flow measurement commonly faces difficulties in measuring large pipe diameters and high flow rates. This is because general flowmeters incur manufacturing and transportation difficulties, increased costs, and higher energy losses as the measurement pipe diameter increases. Ultrasonic flowmeters avoid these disadvantages. Since all types of ultrasonic flowmeters can be installed externally for non-contact flow measurement, the instrument cost is basically independent of the measured pipe diameter. In contrast, the cost of other types of flowmeters increases substantially with diameter. Therefore, the larger the diameter, the more superior the cost-performance ratio of ultrasonic flowmeters compared to other types with similar functions. They are considered excellent instruments for large-diameter flow measurement. Doppler method ultrasonic flowmeters can measure two-phase media flow, making them suitable for measuring dirty flows such as sewage and drainage. In power plants.

ALRE sensor selection

When selecting a flow sensor, users should choose the appropriate sensor based on their own needs. Many users have different requirements for the sensors they use, so the standards selected vary. If highly professional data and results are required, national standards should be selected. However, if it is merely for simple analysis as an instrument within an enterprise, enterprise standards can be selected. When purchasing flow sensors, everyone must consider carefully and choose sensors with guaranteed quality and good usability. Many people assume that new sensors have higher technology levels, which is a very one-sided view. New products must possess mature technology to be considered good products. In many economic sectors, accurate flow measurement has become very important. Nowadays, sensors are basically used to measure flow quantities. Sensors sense fluid flow and convert it into usable output signals; installing sensors makes operation simpler and more convenient. The quantity of flowing objects passing through per unit time is called flow rate. Different flow sensors are used for different objects, and flow sensor types are often distinguished by the measured medium and the measurement method. Flow sensors are generally used for the flow of media fluids in industrial pipelines. Under normal circumstances, there are various media such as gases, liquids, and steam. Several types of flow sensors can be universal for these various media. The first type is the vortex flow sensor. Another type is the ultrasonic flow sensor. With the development of ultrasonic technology, ultrasonic flow sensors can generally measure the flow of most flowing objects. Ultrasonic flow sensors have various measurement methods, each with its own characteristics. We should select based on factors such as the properties of the measured fluid, flow velocity distribution, pipeline installation location, and accuracy requirements. Since industrial flow measurement commonly faces difficulties in measuring large pipe diameters and high flow rates—because general flow sensors incur manufacturing and transportation difficulties, increased costs, and higher energy losses as the measurement pipe diameter increases—ultrasonic flowmeters avoid these disadvantages. The flow measurement accuracy of ultrasonic flow sensors is hardly affected by parameters such as the temperature, pressure, viscosity, and density of the measured fluid. They can also be made into non-contact and portable measuring instruments, thus solving flow measurement problems for strongly corrosive, non-conductive, radioactive, and flammable/explosive media that are difficult for other types of instruments to measure.

Weidou Intelligent Technology professionally sells German ALRE sensors, ALRE proximity sensors, ALRE distance sensors, ALRE vision sensors, ALRE displacement sensors, ALRE torque sensors, ALRE speed sensors, ALRE photoelectric sensors, ALRE position sensors, ALRE angle sensors, ALRE tactile sensors, ALRE temperature sensors, ALRE pressure sensors, ALRE flow sensors, ALRE level sensors, ALRE motion sensors, ALRE process sensors. Original German imports. Welcome customers to inquire and order.