CX series retroreflective photoeyes detect presence when an object interrupts emitted light rebounding off a fixed reflector (sold separately). Using polarized visible red light, these DC-powered rectangular sensors offer adjustable detection ranges up to 2m, and are available with 2m pigtail cable or quick-disconnect.
There are many different styles of photoelectric sensors, but really only four basic technologies: through-beam, reflective, diffuse, and background suppression. The categories of these types of DC photoelectric sensors available from AutomationDirect are:
DC Rectangular photoelectric sensors
start at $51.00
DC Mini-Rectangular Plastic
CX Series Photoelectric Sensors start at $51.00CX Series Photoelectric Sensors Overview