Bently Nevada 3500/42 125972-02 Proximitor Seismic Monitor

The Bently Nevada 3500/42 125972-02 is identified in the supplied description as a proximity and seismic monitoring device for rotating machinery. It measures vibration and displacement signals to support machinery condition monitoring. The supplied specifications cover proximity and seismic signal characteristics, including measurement range, sensitivity, frequency response and output voltage.

Monitoring Function

The 3500/42 functions as a four-channel Proximitor/Seismic Monitor Module within the 3500 machinery protection system. It accepts signals from proximity transducers and seismic sensors, processes the incoming measurements, and supports monitoring of machinery vibration and displacement.

Furthermore, the monitor evaluates measured signals against configured alarm conditions. This allows operators to identify changes in machine condition and assess potential mechanical faults.

Technical Specifications

Signal Monitoring

The module processes proximity and acceleration signals for machinery condition monitoring. For example, proximity transducers provide displacement-related measurements, while accelerometers provide vibration acceleration signals.

In addition, the 3500/42 supports different measurement sensitivities according to the selected monitoring function. These settings determine how the input signal corresponds to the measured mechanical variable.

Front Panel Indicators and Outputs

The front panel provides status indicators for operating condition and communication:

• OK LED: Indicates whether the monitor is operating correctly.
• TX/RX LED: Indicates communication activity with other modules in the 3500 rack.
• Bypass LED: Indicates when the monitor operates in Bypass Mode.

The module also provides buffered transducer outputs through front-panel coaxial connectors. Each channel has an individual connector with short-circuit protection. The buffered output impedance is 550 Ohm.

Frequently Asked Questions

Q: How many input channels does the 3500/42 support?

A: The monitor accepts between one and four signal inputs. The actual configuration depends on the installed I/O module and transducer arrangement.

Q: What is the difference between proximity and seismic monitoring?

A: Proximity monitoring measures shaft displacement relative to the transducer, while seismic monitoring measures vibration through acceleration or velocity sensors. The appropriate measurement depends on the sensor type and configured monitoring function.

Q: Can the 3500/42 operate with different I/O configurations?

A: Yes. The 3500/42 supports standard and TMR I/O configurations. The installed I/O hardware determines the applicable input impedance and wiring arrangement.