Configured for multi-parameter vibration acquisition in 3500 series racks, the Bently Nevada 140734-02 (3500/42 Proximitor Seismic Monitor) provides direct physical signal execution for radial vibration, thrust position, and casing acceleration loops.

Monitor Configuration Matrix

The 140734-02 utilizes four independent input channels, each programmable via the 3500 rack configuration software. The module architecture supports selectable input types, enabling the processing of both eddy-current proximity probes and velocity-type seismic transducers within a single hardware platform.

Hardware Specifications

Rotor Dynamics & Signal Conditioning

The module employs high-resolution 24-bit A/D conversion to ensure signal integrity across the specified frequency response range. Effective rotor dynamics monitoring necessitates accurate eddy-current probe scaling, where the input voltage is mapped to displacement units. The system requires gap voltage validation near the -10 VDC target to confirm correct probe installation and linear response range. Internal circuitry provides cross-talk suppression to maintain measurement precision when multiple probes are installed in proximity to the same shaft target.

Ordering Info

• 140734-02 Monitor Module (4-Channel)

• I/O Module (Internal or External Termination options)

• Configuration Software License

• Shielding and Grounding Kit

Field Installation Guidelines

• Backplane Seating: Align the monitor module with the rear I/O module to prevent pin misalignment during insertion into the rack chassis.

• Shielding: Terminate transducer signal shields to the designated backplane ground studs to mitigate electromagnetic interference in high-noise environments.

• Proximitor Power: Ensure that the transducer supply voltage provided by the 3500 rack matches the requirements of the installed eddy-current probes.

• Hot-Swap Procedure: While the module supports live insertion, verify that the system is in a maintenance state if the loss of signal could trigger false emergency shutdown logic.

Frequently Asked Questions

• How are alarm setpoints handled?

  Alarms are configured in software and executed by the monitor hardware; they are compared against the live input values to trip rack relays.

• Does this module support seismic velocity sensors?

  Yes, the module inputs can be configured to process signals from velocity-type seismic sensors for absolute vibration monitoring.

• What occurs during a "Not OK" condition?

  The module disables the channel outputs and notifies the rack interface module to prevent invalid data from triggering safety shutdown sequences.

• Is the 140734-02 compatible with all 3500 racks?

  The module is compatible with standard 3500 series racks, provided the rack is running a firmware version that supports the 3500/42 module class.

• What is the purpose of the 24-bit A/D conversion?

  It provides high resolution for vibration signals, ensuring that small changes in shaft position or casing vibration are accurately detected.

• Are there channel-to-channel limitations?

  While the channels are independent, they share a common backplane reference; observe standard grounding practices to avoid potential differences.

• How is the module ID determined?

  The module address is defined by its physical slot position within the 3500 rack and recognized by the rack interface module upon startup.

• Can the module be recalibrated in the field?

  Calibration adjustments are performed through the configuration software; physical calibration involves verifying probe scaling and voltage output at the input terminals.