Everything except the Amplifier Unit can be used in an explosion-proof area.

Explanation:

A Photoelectric Sensor with an Optical Fiber has no electrical parts, and therefore can be used even in hazardous, explosion-proof areas. However, the lens, the case and the fiber covering are made of plastic, so they must be free from corrosion or deterioration (fogging) due to contact with solvents.
As long fiber lengths are commonly used in explosion-proof areas, E32-T17L Fiber unit (standard fiber length: 10 m) is recommended.