The Bently Nevada 128229-01 is a Prox/Seismic I/O Module designed for use with the 3500/42M Proximitor Seismic Monitor. It serves as the rear-slot interface that connects field-mounted proximity probes and seismic transducers to the monitoring system, enabling vibration, position, and other critical machinery measurements.
Function and System Role
The 128229-01 provides the physical connection point between sensors and the 3500/42M monitor module. It accepts signals from both proximity probes and seismic transducers, routes them through the 3500 rack backplane, and supplies the necessary excitation power to the connected sensors. The 3500/42M monitor then processes these signals to derive vibration and position measurements, comparing them against user-programmable alarm setpoints to drive machinery protection alarms.
This module is not a standalone monitor. A complete monitoring channel requires the paired 3500/42M monitor module, which performs the actual signal conditioning, measurement calculation, and alarm comparison functions.
Technical Specifications
Parameter Specification
Product Type: Prox/Seismic I/O Module
Compatible Monitor 3500/42M Proximitor Seismic Monitor
Number of Channels: 4 channels
Supported Transducers: Proximity probes, Seismic transducers, Velomitor, Seismoprobe
Input Signal Range: -10 Vdc to +10 Vdc
Power Consumption: 10.5 W typical
Proximitor Excitation -24 Vdc regulated supply
Seismic Excitation: Constant-current excitation
Termination Type: Internal terminations (screw-type terminal blocks)
Dimensions (H x W x D) 241.3 mm x 24.4 mm x 99.1 mm
Weight: 0.20 kg (0.44 lb)
Operating Temperature: -30°C to +65°C
Storage Temperature: -40°C to +85°C
Country of Origin: United States
Design and Integration
The 128229-01 features internal terminations, meaning field wiring connects directly to screw-type terminal blocks on the module itself. This design eliminates the need for separate external termination blocks, reducing cabinet wiring complexity and potential failure points. This distinguishes it from variants like the 128240-01, which requires external termination blocks for field connections.
The module supplies -24 Vdc excitation to power proximity probe assemblies and constant-current excitation for seismic transducers such as Velomitors and accelerometers. It also performs continuous loop diagnostics, detecting open-circuit, short-circuit, and abnormal impedance conditions on each channel and reporting fault status to the front-panel monitor for system alarming.
For measurement capabilities, the 128229-01 supports radial vibration, thrust position, differential expansion, eccentricity, REBAM, velocity, acceleration, and shaft absolute measurements when paired with the appropriate 3500/42M monitor configuration.
Compatibility and Pairing
The 128229-01 is designed specifically for the 3500/42M Proximitor Seismic Monitor and must be paired with that monitor module for proper operation. It is a legacy-version rear I/O module that pairs with the 3500/42M main monitor module and is not compatible with non-M-series 3500/42 hardware.
The module installs in a full-height rear slot of the 3500 rack chassis and supports hot-swap replacement while rack power remains energized. Field sensor wiring should be de-energized before modifying terminal connections.
Applications
The 128229-01 is deployed in industries where continuous monitoring of rotating machinery is essential. Typical applications include:
Power Generation: Steam and gas turbine vibration monitoring
Oil and Gas: Compressor and pump condition monitoring
Petrochemical: Process machinery protection
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