WF3T-B4210

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Optical Sensors are devices which detect and measure light. They are equipped with various sensing elements such as photodiodes, photoresistors, and phototransistors. Photointerrupters are one type of optical sensor that detect the presence of a physical object, such as a slot in a printed circuit board (PCB). The WF3T-B4210 is a slot type photointerrupter with a transistor output, and is well-suited for precision sensing applications where the detection of a tiny gap is critical.

The WF3T-B4210 consists of an infrared transmitting and receiving element housed in a slotted plastic body. The sensing element, which uses optical coupling, is typically comprised of a light-emitting diode (LED) and a phototransistor. When an object passes through the gap between the emitter and detector, the light path is broken and the output is switched off, creating an output signal known as a "frame".

The WF3T-B4210 contains a built-in metal oxide semiconductor field effect transistor (MOSFET), which is used to switch the output on and off. The LED is driven by a constant current source, and the photo-transistor is connected in reverse bias to the MOSFET. When the object is present, the photo-transistor will lower the gate-source voltage of the MOSFET, which in turn will cause the MOSFET to switch off the output signal.

The WF3T-B4210 offers a wide range of applications, including detection of objects on powered conveyors, card feeders, and robotic arms. It can also be used in industrial equipment such as barcode readers and automation systems. The device’s compact size, crisp output signal, and low power consumption makes it highly suitable for modern automation systems.

Another advantage of the WF3T-B4210 is its ease of installation. It can be directly mounted on a PCB using its built-in mounting clip, and once mounted, the device requires no additional adjustment. The device also features an end-of-travel output signal, which is useful for applications where precise positioning is desired. The end-of-travel signal is output when the object reaches the end of its travel, so the system can shut off the motor or other system being controlled.

The WF3T-B4210 offers excellent sensing characteristics and reliably detects objects of all shapes and sizes. The low power consumption makes it an ideal choice for battery-powered applications, while its wide operating temperature range makes it suitable for a variety of environments. With its robust design and reliable operation, the WF3T-B4210 is an ideal choice for precision sensing applications.

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