SF2-EH28

Series:	*
Part Status:	Active
Mounting Type:	--
Package / Case:	Module, Pre-Wired

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Optical Sensors - Photointerrupters - Slot Type - Logic Output

The SF2-EH28 is a slot-type photointerrupter in the Logic Output line of optical sensors. Inductive-type photoelectromechanical components are divided into two main categories: slot-type photointerrupters (also called slotted optical switches) and transmissive-type photointerrupters. Photointerrupter switches are devices that sense the presence of objects in a lighted mechanical channel, and their employment in multi-sensor systems like electronic door locks, automatic garage door openers, etc., makes them popular in the industry.The SF2-EH28 is a single channel "visible beam type" slot-type optical switch. Its main features are a 12 x 2.4 x 15 mm black plastic package, an NPN-type transistor output, and a 5 mm sensing distance, which makes it suitable for a wide range of applications. In addition, it features a 12V operating voltage, up to 2A output contact current rating and a 30 mA input current rating. The unit\'s maximum response speed is 0.15 ms and its primary life cycle exceeds 40,000 times. The unit also features a minimum of 2KV ESD protection.The SF2-EH28 utilizes a slot-type optical-mechanical system of light-beam shuttering, which is a mechanical structure of usually infinitely variable but continously adjustable width. This type of structure is usually employed in PC boards, and it is ideal for non-flammable, dust-free, and other exacting environments. The number of slotted optical switches and the degree of optical intensity determine the degree of accuracy of the switching.The SF2-EH28 works by interrupting a light-beam within a slot-type mechanical structure, and the interruption of the light beam causes a photoelectric action, which in turn creates an electrical switch closure. The switching action occurs when one edge of the object that is interrupting the light beam moves out of the slot, and then the other edge moves in and out of the slot. As the interrupting object is moved beyond the open slot, the light beam is again un-interrupted, and the electrical switching action that occurred is reversed.In operation, the SF2-EH28 is typically driven by an LED which is paired with a photon detector. The output of the photon detector is then connected to the object being detected. When the object interrupts the light beam, the photon detector triggers the associated switch closure. This allows for selective control of the switching action and helps to assure reliable performance of the system.The SF2-EH28 is primarily intended for industrial applications, and it is well suited for a wide range of tasks in which selective control of a switching action is important. Such applications include in-line object sensing, proximity sensing, and surface-mount switching of various types. The switch can also be used in a wide variety of other applications such as safety interlocking doors, laser printers, automatic test equipment and medical-diagnostic equipment. All of these applications would benefit from the SF2-EH28\'s small size, long life-cycle, ESD protection, and high level of accuracy.The SF2-EH28 is an ideal choice for a wide range of industrial and consumer applications, and its solid construction and consistent performance make it a reliable choice. The switch\'s small size, high level of accuracy, long life-cycle, and protection against electrostatic discharges assure that the SF2-EH28 is a secure and viable choice for today\'s modern applications.

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