Bently Nevada 140072-04C Position Monitor

The Bently Nevada 3500/45 Position Monitor (part number 140072-04) is a four‑channel instrument that precisely monitors axial (thrust) position, differential expansion, case expansion, and valve position by conditioning signals from Proximitor transducers, Rotary Position Transducers (RPTs), and DC/AC linear variable differential transformers (LVDTs) or rotary potentiometers. Each channel accepts one input type, with programmable alarms that trigger when measurements breach user‑defined limits, enabling real‑time machinery protection within the 3500 Machinery Protection System used in turbine applications. Electrical characteristics include input impedance of 1 MΩ for DC LVDTs, 137 kΩ for AC LVDTs, 200 kΩ for rotary potentiometer inputs, and 10 kΩ for Proximitor/RPT inputs; typical power consumption ranges from about 5.6 W to 8.5 W depending on input configuration, with supply rails of -24 Vdc (Proximitor/RPT), +15 Vdc (DC LVDT), and 2.3 Vrms at 3400 Hz for AC LVDTs, while rotary potentiometers typically require -12.38 Vdc. The unit supports -30°C to +65°C ambient operation when used with internal/external termination I/O, -40°C to +85°C storage, and up to 95% non‑condensing humidity, and weighs about 0.9 kg; front‑panel indicators provide status and bypass information for quick visual checks. Designed to integrate with the 3300XL Proximitor/RPT and LVDT families, the 3500/45 enables monitoring of axial thrust, differential expansion, valve position, and case expansion, forming a core component of Bently Nevada’s turbine protection ecosystem.