Application introduction of switch sensor
The so-called sensor is defined as follows: it can feel the measured information, and can transform the sensed information into electrical signals or other required forms of information output according to certain rules, so as to meet the needs of information transmission, processing, storage, display, recording and control requirements. Therefore, the objects measured by liquid level, pressure, temperature, and flow sensors are very clear, and what they need to do is to convert the changing information into electrical signals or other required forms of information in the light of certain rules.
These sensors can be divided into two categories, one is switch type, and the other is continuous type.
Let me explain here that many people treat the switching type and the continuous type differently, which is understandable. After all, the switching type outputs a switching signal, which is mainly used for electrical control, while the continuous type outputs a standard signal ( 0–10V or 4–20mA), usually called a transmitter, is mostly used for monitoring (it can also be controlled).
The switch type is to use the switch value as the output signal, and the corresponding ones are called liquid level switch, pressure switch, temperature switch and flow switch.
Take the liquid level switch as an example. When the liquid level reaches a certain position, the switch acts, open or close. Generally, the liquid level switch has a set of contacts, one normally open and one normally closed.
There are two types of common liquid level switches: float switch and induction switch. The float switch uses the buoyancy effect on the float when the liquid reaches the liquid level to make the float switch actuate. The inductive liquid level switch calculates the liquid level by the time of transmitting the signal and receiving the signal.
The corresponding pressure switch, temperature switch, flow switch and the liquid level switch have the same principle, and they all switch when a certain value is reached, and are mostly used in electrical control circuits.
