The working principle and characteristics of time RF sensor

　　1. Working principle and characteristics of electromagnetic RF sensor

　　Electromagnetic RF sensor is generally composed of iron core, coil, time RF sensor, working principle, characteristic armature, contact reed and so on. As long as a certain voltage is added to both ends of the coil, a certain current will flow through the coil, resulting in an electromagnetic effect, and the armature will overcome the pull of the return spring under the action of electromagnetic force attraction to attract the iron core, thereby driving the moving contact of the armature and the static contact (normally open contact). When the coil is powered off, the electromagnetic suction will also disappear, and the armature will return to the original position in the spring reaction force, so that the moving contact and the original static contact (normally closed contact). This suction, release, so as to achieve the purpose of conduction in the circuit, cut off. For the "normally open, normally closed" contact of the RF sensor, it can be distinguished as follows: the static contact that is in the disconnected state when the RF sensor coil is not powered on is called "normally open contact"; The static contact in the connected state is called "normally closed contact".

　　2, the working principle and characteristics of thermal reed RF sensor

　　Thermal reed RF sensor is a new kind of thermal switch which uses thermal magnetic material to detect and control temperature. It is composed of a temperature-sensing magnetic ring, a constant magnetic ring, a reed pipe, a heat-conducting mounting piece, a plastic substrate and some other accessories. Thermal reed RF sensors do not use coil excitation, but the magnetic force generated by the constant magnetic ring drives the switching action. Whether the constant magnetic ring can provide magnetic force to the reed tube is determined by the temperature control characteristics of the temperature-sensing magnetic ring.

　　3, solid state RF sensor (SSR) working principle and characteristics

　　Solid state RF sensor is a two-terminal time RF sensor, the working principle, the characteristics of the input end, the other two terminals for the output four-terminal device, the middle of the isolation device to achieve the input and output electrical isolation.

　　Solid state RF sensors can be divided into AC type and DC type according to the load power supply type. According to the type of switch can be divided into normally open type and normally closed type. According to the isolation type, it can be divided into hybrid type, transformer isolation type and photoelectric isolation type, and photoelectric isolation type is the most.

　　When the input voltage, current, temperature, etc.) reaches the specified value, the controlled output circuit is switched on or disconnected. Can be divided into electrical (such as current, voltage, frequency, power, etc.)RF sensors and non-electrical (such as temperature, pressure, speed, etc.)RF sensors two categories. It has the advantages of fast action, stable operation, long service life and small size. Widely used in power protection, automation, motion, remote control, measurement and communication devices.

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