330878-91-05 Bently Nevada Proximity Sensor Description Th e 330878-91-05 is part of the Bently Nevada “3300 XL” (or similar) Proximity/Proximitor sensor family, designed for non-contact displacement (gap) measurement of conductive targets (e.g., shafts, collars) in rotating machinery.Specifically, the “3300 XL 50 mm” transducer system is often referenced for the 330878 series. The datasheet describes a system consisting of: a probe (50 mm / some range), extension cable, and