Product Overview
The Bently Nevada 84140-01 is an XDUCR I/O and Record Terminals module, a rear-mounted termination assembly for the Bently Nevada 3300 Series Monitoring System. Installed on the rear of the 3300 instrument rack chassis, the Bently Nevada 84140-01 provides the physical and electrical interface between field-mounted transducers — proximity probes, seismic velocity and acceleration sensors, and their associated signal conditioners — and the front-slot monitor modules that perform the actual measurement and alarm processing. In a 3300 architecture, the monitor module is the intelligent element, while the terminal module is the point where every field conductor, recorder output and relay contact permanently lands.
Functionally, the Bently Nevada 84140-01 does three jobs. First, it accepts transducer signal input and routes the dynamic vibration or position waveform into the rack backplane for the associated monitor. Second, it provides dedicated recorder outputs — proportional, buffered signals that can be wired to a chart recorder, data logger, oscilloscope, portable analyzer or DCS analog input, so machinery behaviour can be captured and analysed without disturbing the primary protection loop. Third, it carries the alert relay outputs that convert a monitor’s Alarm and Danger decisions into hard contacts for annunciation, interlock and shutdown circuits. This separation of measurement, recording and protection is what allows a technician to connect diagnostic equipment while the machine stays protected.
The Bently Nevada 84140-01 is associated with the 3300 6-slot system chassis and is catalogued alongside companion terminal assemblies 78462-01 and 80074-01, serving monitor types such as the 3300/20 Dual Thrust Position Monitor, 3300/25 Dual Acceleration Monitor, 3300/45 Dual Differential Expansion Monitor and 3300/48 Case Expansion Monitor. Because the 3300 platform is now obsolete with limited factory support, the Bently Nevada 84140-01 is today primarily a strategic spare for plants keeping installed machinery protection systems in service on turbines, compressors, pumps and generators.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 84140-01 |
| Manufacturer | Bently Nevada (GE / Baker Hughes) |
| Product Type | XDUCR I/O and Record Terminals Module |
| System Compatibility | Bently Nevada 3300 Series Monitoring System, rear-mount terminal position |
| Associated Monitors | 3300/20, 3300/25, 3300/45, 3300/48 and other 3300 monitor modules |
| Primary Function | Transducer signal termination, buffered recorder outputs, alert relay outputs |
| Transducer Inputs | Proximity probe, seismic velocity and acceleration, position and expansion signals |
| Recorder Outputs | Proportional analog outputs (typically 4–20 mA, 0 to –10 Vdc or +1 to +5 Vdc) for external recording |
| Buffered Outputs | Buffered transducer signal available for analyzers and portable data collectors |
| Relay Outputs | Alert relay contacts for alarm and shutdown (dual relay configuration, hermetically sealed options) |
| Output Voltage Range | Approximately ±24 Vdc signal range |
| Frequency Response | 0 to 10 kHz for dynamic vibration signals |
| Connector Type | Screw terminal blocks for field wiring, backplane connector to the rack |
| Mounting | Rear-mounted terminal assembly on the 3300 instrument rack chassis |
| Operating Temperature | 0 °C to +65 °C (32 °F to +149 °F) typical for 3300 I/O terminals |
| Storage Temperature | –40 °C to +85 °C (–40 °F to +185 °F) |
| Humidity | Up to 95 % non-condensing |
| Dimensions | Approximately 5.1 cm × 10.2 cm × 22.9 cm (2.0 in × 4.0 in × 9.0 in) |
| Approximate Weight | 0.35 kg to 0.4 kg |
| Compliance | Designed for API 670 machinery protection systems; CE recognized |
