Solid-state relay (also known as solid relay) English name is Solid State Relay, referred to as SSR. It is a non-contact switching device with relay characteristics that uses semiconductor devices instead of traditional electrical contacts as switching devices. Single-phase SSR is a four-terminal active device, in which two input control terminals, two output terminals, and the input and output are light Isolated, the input terminal can be switched from off-state to on-state after adding DC or pulse signal to a certain current value.

Solid state relays work reliably, long life, no noise, no spark, no electromagnetic interference, fast switching speed, strong anti-interference ability, and small size, impact resistance, vibration resistance, explosion-proof, moisture-proof, anti-corrosion, and TTL, DTL, Logic circuits such as HTL are compatible with direct driving of large current loads with tiny control signals. The main disadvantages are the on-state voltage drop (required corresponding heat dissipation measures), off-state leakage current, AC and DC cannot be universal, the number of contact groups is small, and other indicators such as over-current, over-voltage and voltage increase rate, current rise rate are poor.

Linear Displacement Sensor

Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities into electricity. In the production process, the measurement of displacement is generally divided into measuring the physical size and mechanical displacement. According to the different forms of the measured variable, the displacement sensor can be divided into two types: analog and digital. The analog type can be divided into two types: physical property type and structural type. Commonly used displacement sensors are mostly analog structures, including potentiometer-type displacement sensors, inductive displacement sensors, self-aligning machines, capacitive displacement sensors, eddy current displacement sensors, Hall-type displacement sensors, etc. An important advantage of the digital displacement sensor is that it is convenient to send the signal directly into the computer system. This kind of sensor is developing rapidly, and its application is increasingly widespread.

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