SF4-AH56-N

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Optical Sensors are important components in many industrial applications due to their cost efficiency, accuracy, and wide range of applications and environmental conditions. The photointerrupter has an optical output port for detecting the interruption of a beam of light and an electric output port for providing a signal corresponding to the detected interruption. Among these types of photointerrupters, the Slot Type with Logic Output is a specialized type, with SF4-AH56-N being a specific example. This article is an overview of the SF4-AH56-N, discussing its application field and working principle.

The SF4-AH56-N is an active-type slot type photointerrupter with logic 1 output, meaning it output an inhibit signal when an interruption of the light is detected. Its application field is mainly in controlling the on and off states of devices such as motors, pumps, home appliances, and electronics. Specifically, it is used to detect objects as they pass in between the sender and receiver, provide a signal of the passage, stop an operation of a motor in the case of an emergency or a fault, and secure a situation for automatic controlling of devices.

As for the physical composition of the SF4-AH56-N, it consists of five main parts: the infrared LED (Light Emitting Diode), the slot, the spacer, the photodetector IC, and the reflector. The infrared LED transmits the IR (Infrared) rays which are then received by the photodetector IC. When an obstruction enters the slot of the SF4-AH56-N, the photodetector IC detects this interruption of the IR beam and outputs a high level electrical signal for the duration of the interruption. Once the obstruction is removed from the slot, the photodetector IC again senses the IR that is reflected from the reflector and outputs a low level electrical signal.

In terms of system design considerations, key points that the user must keep in mind are the supply current, LED current, interrupting speed, response time, LED rated Optical power, and ambient temperature. It is especially important to take into consideration the LED current and the ambient temperature when designing the power PCB. In cases where the current may exceed the max current specified in the specifications, the power PCB must be designed to reduce the current.

In terms of safety, the SF4-AH56-N conforms to the requirements of the IEC 60947-5-2 standard for photoelectric switches and the requirements of the Standard for IEC 60947-2, thus it is optimally suited for applications that demand high safety levels.

The SF4-AH56-N is an ideal type of Photointerrupter. Its application field is mainly in controlling the ON/OFF states, and it provides a user with safety features for optimal performance both in terms of function and safety. Its design considerations require attention to the supply current and other features as well as the ambient temperature. As for its working principle, the infrared LED transmits IR beams which are then detected by the photodetector IC, sending a signal accordingly. When an obstruction is present, the signal is high, and when it is absent, the signal is low.

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