Tough proximity sensors handle rough environments.

In metalworking applications, proximity switches generally fail owed to mechanical damage caused when the intended target physically contacts the switch or because coolant attacks plastic materials and penetrates seals. Fortunately, admitting new efector in proximity switches from ifm efector inc., Exton, Pa., crush both of these problems.
In order to bring damage from physical contact, many manufacturers present "rugged-duty" switches in all-metallic housings, including the sensing face.