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This application uses a Proximity Sensor with a Built-in Amplifier with resistance to aluminum chips.

If you mount this Sensor facing upward, it can detect presence of drills without being affected by aluminum chips.
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Detect Aluminum / Iron Objects in Environments with Aluminum Chips


Conventional sensors often failed with aluminum chips, which caused the facilities to stop.


A new pulse response method prevents failure when aluminum chips attach to the sensing face of the sensor.

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