Tag Archives: npn

An Easy Way to Remember PNP and NPN Sensor Wiring

Here’s a simple way remember how to wire up a 3-wire DC PNP or NPN sensor: PNP = Switched Positive NPN = Switched Negative “Switched” refers to which side of the controlled load (relay, small indicator, PLC input) is being … Continue reading

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Where Did You Find That Sensor?

I recently visited a customer that has a large amount of assembly lines where they have several machine builders manufacturing assembly process lines to their specification. This assembly plant has three different business units and unfortunately, they do not communicate … Continue reading

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Imagine the Perfect Photoelectric Sensor

Photoelectric sensors have been around for a long time and have made huge advancements in technology since the 1970’s.  We have gone from incandescent bulbs to modulated LED’s in red light, infrared and laser outputs.  Today we have multiple sensing … Continue reading

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Industrial Sensing Fundamentals – Back to the Basics: NPN vs PNP

Written by: Andrew Bollinger What’s the difference and why should anyone care? If you’re confused by the terms PNP and NPN, then hopefully this post will shed some light on the differences between the two.  In the context of this … Continue reading

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