Educational And Training Videos
What is a Sensor? from AutomationDirect
To learn more: https://www.AutomationDirect.com/sensors?utm_source=03Cn86kaZIE&utm_medium=VideoTeamDescription
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Industrial automation is constantly evolving to make the world more efficient. From moving boxes across the globe to robotic applications that drastically improve productivity and machines that can replicate perfection, automation is here to improve the world. None of this would be possible without one of the system's most minor yet essential components: the sensor. Watch this video to learn more about sensors, and visit us today to purchase one for your application.
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Industrial automation is constantly evolving to make the world more efficient. From moving boxes across the globe to robotic applications that drastically improve productivity—and machines that can replicate perfection—automation is here to make the world a better place. None of this can be accomplished without one of the smallest yet most essential components in the system: the sensor. Today, let’s take a big-picture look at some of the sensors used in industrial automation—and learn what a sensor actually is! According to Webster’s Dictionary, a sensor is “a device that responds to a physical stimulus (such as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control).” Sensors come in many forms and offer different types of output signals. The output can be an electromechanical relay contact, or it can be solid-state. If it’s a solid-state output, the logic may be NPN or PNP. Either output type can be Normally Open (NO) or Normally Closed (NC). With the rise of IO-link technology, sensors have become increasingly smarter. IO-link enables communication beyond just simple on/off or analog signals. It allows for the transmission of device data, diagnostics, and event information to higher-level systems. This enhanced communication makes the sensor a "smart sensor," capable of more accurate and detailed monitoring and control of industrial processes” Industrial automation sensors use various technologies to detect objects or materials. AutomationDirect offers various versions of temperature sensors, pressure sensors, and encoders, which all meet the definition of a sensor. Instead of focusing on the entire range of sensors, let’s focus on the discrete variations: • Limit switches • Inductive proximity sensors • Magnetic proximity sensors • Capacitive proximity sensors • Photoelectric sensors • and Ultrasonic sensors A limit switch is an electromechanical device that activates when an object makes physical contact with its actuator. They can be as coarse or as precise as needed. These switches are not affected by ambient light and are rugged enough for the harshest environments. One downside is that they require physical contact to detect an object. While mechanical parts do wear out over time, these switches are typically low-cost and easy to replace. Inductive proximity sensors allow non-contact detection of metallic objects at close range using an inductive field. Magnetic Proximity Sensors detect magnetic fields and convert that information into electrical signals. They can monitor position, proximity, motion, and even the direction of an object. Common types include Hall effect sensors, reed switches, and giant magneto-resistive (GMR) sensors. Capacitive proximity sensors detect objects near their sensing face using an electrostatic field created by an internal dielectric plate. Unlike inductive sensors, they’re not limited to detecting metal. They can also sense non-metallic materials such as liquids, pellets, or powders—even through container walls made of plastic, wood, paper, or glass. Ultrasonic sensors are a type of proximity sensor that use sound instead of light or electromagnetic fields. They emit a high-frequency sound pulse, then measure the time it takes for the echo to return after bouncing off an object. This allows them to detect objects at distances of up to 8 meters—regardless of the object’s color, texture, or material. Photoelectric sensors use light to detect the presence of objects. Light is either reflected off an object or reflector or transmitted directly from an emitter to a receiver. The sensor detects changes in light intensity to determine object presence, using either a light-activated or dark-activated mechanism. There are four main types of photoelectric sensor technologies: Through-beam, Retro-reflective, Diffuse, Diffuse with Background Suppression. In diffuse, retro-reflective, and background suppression configurations, both the emitter and receiver are housed in the same unit. Through-beam sensors, however, consist of a separate emitter and receiver. With so many types and technologies to choose from, here are a few key questions to ask when selecting the right sensor for your application: What are you trying to detect? Is it a solid, liquid, grain, or powder? Will the sensor touch the object, or will it be mounted at a distance? Is the object within 40 mm of the sensor? How will the sensor be mounted? Drilling down to these details is essential to selecting the correct sensor for your specific application. Need help answering these questions? Check out our Object Detection Selector Tool to find the sensor best suited for your needs. We also offer free technical support if you have questions or need assistance. Visit our website today to explore our full sensor selection. We’ll see you soon at AutomationDirect.com! Click here to learn more about our sensors. Click here for more videos.
