capacitive level switch with rope probe designed for light solids. AA: Approval for non-hazardous areas., 1: Threaded process connection (R 1-1/2, PPS)., 4: Probe length (e.g. 2000 mm or 2 meters)., D: F14 polyester housing with M20 cable gland., 1: 3-wire PNP transistor output (10.8-45VDC).