Sensor selection starts with 'what needs to be detected?' Inductive for metal, capacitive for any material/liquid, optical or ultrasonic for long distance.
- Material and distance — determine the sensing type
- Environment (IP rating) — resistance to moisture, dust, washdown, oil
- Output — PNP/NPN, NO/NC, analog (4-20 mA)
- Smart features — IO-Link for diagnostics and easy replacement
For washdown food/packaging lines, prefer at least IP67/IP69K, stainless-body sensors.
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