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Tag Archives: retroreflective
In my last blog, Imagine the Perfect Photoelectric Sensor, I discussed the possibilities of a single part number that could be configured for any of the basic sensing modes: through-beam, retroreflective, background suppression and diffuse. This perfect sensor would also … Continue reading
Photoelectric sensors are used in a wide variety of applications that you encounter every day. They are offered in numerous housing styles that provide long distance non-contact detection of many different types of objects or targets. Being used in such … Continue reading
Recently I was asked if light on and dark on for a photoelectric sensor was the same as normally open and normally closed. The short answer is yes, but I think it justifies more of an explanation. In the world … Continue reading
Sometimes the things that always seem the simplest can really be the most confusing. In the world of the Photo sensor, the principle of “light-on” vs. “dark-on” is won of those things. So what am I talking about you may say? Well let’s look at both and see if I can help define these concepts.
The most popular photoelectric sensor used is the retro-reflective or reflex mode sensor. One of the advantages of the retroreflective style photoelectric sensors is the light emitter, or light source, and the receiver are in the same enclosure, thus you only have a single device to mount and wire making installation easier and faster. The output of the sensor changes state when the object blocks the light beam between the sensor and the reflector. Continue reading