How does the classification of liquid flow sensors work?

by:Sure     2020-06-21
The liquid flow sensor can be divided into a corrosive liquid flow sensor and a non-corrosive liquid flow sensor. This is only distinguished from the aspect of the medium, and it is also the first thing to pay attention to in the application selection. After determining the nature of the liquid, it is divided according to our own application needs. The metering liquid flow sensor or the analog signal output flow sensor. The metering type now generally has a pulse signal (Seisen water flow sensor), imitating The quantity signal output is mostly the digital signal output (such as reed switch water flow switch), which can also be converted into current and voltage signals. The imitated quantity only provides an imitated (switching) quantity, which cannot be measured. Relatively speaking Relatively rough, there is no measurement type liquid flow sensor with high accuracy, and the imitation amount of the starting flow rate is also an issue to be considered by the switching liquid flow sensor. According to the accuracy, there are water meter grades (B grade and A grade, generally within 2% to 3% of the error, it is necessary to have a measurement certificate), more than 5%-10% of the electronic category is generally used today It is used as a switch signal, or water control water heating and other applications, such as electric water heaters, water dispensers, coffee machines, gas water heater water flow sensors (Seisen water flow sensors). Summarized in one sentence: one starts with the medium, the other starts with the application of the demand to enter the water, and the third starts with the accuracy, you can choose the liquid flow sensor you want. Introduction of measurement principle of liquid flow sensor: The liquid flow sensor and flow converter can form a flowmeter for measuring the liquid in the closed pipeline that does not corrode stainless steel, corundum, and cemented carbide, and has no impurities such as fibers and particles. It has the characteristics of simple structure, light weight, high accuracy, good reproducibility, responsiveness, easy installation and maintenance, etc. It is widely used in petroleum, chemical, metallurgy, water supply, papermaking and other industries, and is an ideal liquid sensor for flow measurement and energy saving. Measuring principle of liquid flow sensor: The fluid flows through the liquid sensor housing. Because the blade of the impeller has a certain angle with the flow direction, the impulsive force of the fluid makes the blade have a moment of rotation. After the friction torque and fluid resistance are overcome, the blade rotates. After the torque is balanced, the speed is stable and under certain conditions. , The rotation speed is proportional to the flow rate, because the blade has magnetic permeability, it is in the magnetic field of the signal detector (consisting of permanent magnetic steel and coil), the rotating blade cuts the magnetic field lines, and periodically changes the magnetic flux of the coil, so that the two ends of the coil An electrical pulse signal is induced. The signal of the liquid flow sensor is amplified and shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument remotely to show the instantaneous flow or total amount of fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the liquid flow sensor. The flow equation is: where:   F――Pulse frequency [Hz]   K――Meter coefficient of liquid flow sensor [1/m3], given by the check list. If the unit is [1/L]   Q――Instantaneous flow of fluid (in working state) [m3/h]   3600――Conversion coefficient Note: The liquid flow sensor is suitable for media with a viscosity of less than 5×10-6m2/s at operating temperature. For liquids with a viscosity greater than 5×10-6m2/s, the liquid flow sensor needs to be calibrated before use.
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