Over the years I have worked for and / or contracted for companies that manufacture with, design, or repair industrial control systems. The most common sensor I have worked with are 24V proximity sensors that detect the presence of metal and have an NPN or PNP output. These can be normally open or normally closed.
The sensor tester can tell you if the sensor is working properly, and whether the output is NPN or PNP. It also supports most dual-output sensors. The status for each sensor output is displayed on a Bi-Color LED and supplies 24V to the sensor under test.
You can connect sensors with wire terminations to the terminal block connector, which provides 24V, COM, and 2 inputs. You can also connect sensors with an M12, 4-pin connector to the M12 cable on the tester. This connector supports sensors with two outputs (dual sensors).
This project uses a Hammond 1591 Enclosure. First a hole is milled in the end of the enclosure for the M12 strain relief. Next holes are milled on the top of the enclosure for the LEDs and spring terminal connector.
LED clips and spring (speaker) terminals are installed, as is the M12 strain relief.
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