Limit Switches are electro-mechanical devices consisting of an actuator mechanically linked to a set of contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection. Allen-Bradley limit switches are suited for many applications and environments. They are rugged enough to withstand a variety of conditions, and they are easy to install and operate reliably. Hazardous Location Switches are designed for use in applications such as refineries, distilleries, flour mills and other locations where dangerous gases or materials may be present.
How do you decide what type of sensor you need? Inductive Proximity Sensors detect metal objects within approximately 1-2 inches of the sensor without touching the objects. Some applications for inductive proximity sensors are light-duty packaging as well as harsh environments like with automotive welding equipment or the washdowns in food processing plants. Tubular Capacitive Proximity Sensors have an adjustable sensing distance and are equipped with two status indicators to show power and output. They may be shielded in nickel, such as the 875C sensors, or unshielded like the 875PC, which features a plastic barrel. Ultrasonic sensors are self-contained solid-state devices designed for non-contact sensing of solid and liquid objects. These sensors are available in a number of sensing ranges and may, for example, be used for applications like sensing the amount of water in a tank.
Photoelectric Sensors use a beam of light to detect the presence—or absence—of an object. This technology is an ideal alternative to inductive proximity sensors when the sensing distance is long or the item you want to sense is not metal. Allen-Bradley photoelectric sensors are appropriate for applications in many industries, such as material handling, packaging, food processing, and transportation. For specialized applications that require a non-standard connector or cable, our Rockwell specialists can help you customize the sensor connections.
