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Water and air detection in digital flow switches

The type of flow switch is generally divided into digital and mechanical type, flow switch is mainly used for the specified value in the specified fluid boulevard, then the electrical contact is connected or disconnected, then you know that the air and water are used separately What is the principle of digital flow switch inspection? The following mass flow controller Xiaobian to talk about for you;
First, the air uses digital flow switch detection principle
When used to detect air, the flow path is equipped with a speed sensor and a temperature correction element. When the air absorbs heat from the thermistor, the heat will decrease and the resistance will increase. When the resistance increases, the air flow rate will also change. How does this time detect the air flow rate? Can be based on the resistance value to detect; In addition to prevent the influence of media and ambient temperature, then the switch needs to have built-in temperature sensor, so that you can measure the flow rate stably;
Second, the principle of digital flow switch detection of water
When digital flow switch is used in water, the velocity sensor is installed inside the flow channel. When the slender body flows down, there will be a replacement vortex, which is called Karman vortex. Through this vortex, the fluid flow can be measured.
The above is the principle of the digital flow switch for measuring air and water, hoping to help you.

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