Inductive Proximity Switch: Always the 1st Choice

Sensing Metals

When you select an inductive prox switch, you'll need to determine a body style and size. This will be determined by space considerations and how much sensing range you need. There is little else to consider; if you're sensing metal targets at close range, an inductive proximity switch is always the best choice. Prox sensors are inexpensive, compared to other sensing devices, and they are easy to mount and operate. You can apply them in hostile surroundings without the many considerations you must address when you're applying photoelectrics. About the only mounting considerations, beyond mounting the switch within range of the target, is deciding whether to use a shielded or unshielded switch (covered next slide). Prox switches don't care what color the target is, they don't care how much grit and grime is present, they don't care about much. It's this simple: if your target is metal, and if you can mount a sensor close to it, use an inductive prox switch. No further decisioning required!

About the sensing pattern as it relates to the target:

A common misconception about inductive prox switches is that the switch will not operate properly if a foreign substance gets on the sensing tip, or if a foreign matter comes between the sensing tip and the target in any way. Not true. The "beam" is not "bouncing back" off the target as with a diffuse photo eye. If the metal target comes within the sensing pattern, BINGO! It's that simple.