3500/40M-01-00 140734-01 Bently Nevada

• Input Signal: 1–4 eddy current probe signals
• Power Consumption: Typically 7.7 W
• Input Impedance: Standard I/O: 10 kΩ
• Probe Power Supply: -24 Vdc
• Buffered Output: 1 coaxial connector per channel, short-circuit protected, output impedance 550 Ω
• Radial/Thrust/Eccentricity Sensitivity: 3.94 mV/μm (100 mV/mil) or 7.87 mV/μm (200 mV/mil)
• Differential Expansion Sensitivity: 0.394 mV/μm (10 mV/mil) or 0.787 mV/μm (20 mV/mil)
• REBAM Sensitivity: 40 mV/μm (1000 mV/mil) or 80 mV/μm (2000 mV/mil)

The Bently Nevada 3500/40M 140734-01 is the core four-channel preamplifier and monitor module in the 3500 Series mechanical condition monitoring system. This module receives input signals from proximity sensors, conditions the signals to generate various vibration and position measurement parameters, and compares them with user-programmable alarm setpoints.

This module serves as the "signal processing brain" of the 3500 system. It draws power and communicates via the backplane to drive the corresponding I/O submodules at the front end, while transmitting alarms, static values, and buffered data to the frame controller at the rear. The module is widely used in large rotating machinery protection applications across industries such as power generation, petrochemicals, and metallurgy, with a typical MTBF of up to 55,000 hours.

1. 01 — Proximitor I/O module with internal terminals; compatible backplate: 125680-01
2. 02 — Proximitor I/O module with external terminals; matching backplate is 126615-01; requires separate purchase of an external terminal block (125808-01 or 128015-01) and cable (129525-AAAA-BB)
3. 03 — Proximitor I/O module with internal isolation barrier and internal terminals; matching backplane: 135489-04

1. 00 — No certification
2. 01 — cNRTLus (Class I, Division 2)
3. 02 — ATEX / IECEx / CSA (Class I, Zone 2)

A 660-MW coal-fired power plant in North America uses the 140734-01 module to monitor the vibration and displacement of eight turbine bearings and two generator shafts. By continuously comparing the monitored parameters with alarm setpoints, the module provides critical protection for the unit's safe grid connection and load regulation.

The 140734-01 is the order number/part number for the 3500/40M Proximitor Monitor (four-channel eddy current monitoring module); both refer to the same module product.

Up to two. Modules are programmed in pairs by channel; channels 1 and 2 perform one function, while channels 3 and 4 perform another (or the same) function.

The module's typical power consumption is 7.7 W; the module supplies the probes with a -24 Vdc power supply.