Product Overview

The Bently Nevada 135489-01 is a 4-channel Input/Output (I/O) module designed for use with the 3500/42M Proximitor Seismic Monitor within the 3500 Series Machinery Protection System. This specific hardware variant is equipped with Internal Barriers and Internal Terminations, providing a compact and intrinsically safe interface for transducers located in hazardous industrial environments.

The module processes signals for 4 x Prox/Accel (Proximity or Accelerometer) transducers on channels 1 through 4. By integrating internal safety barriers, the 135489-01 limits the electrical energy sent to the field sensors, preventing potential ignition in explosive atmospheres while eliminating the need for external barrier hardware. It is a critical component for monitoring vibration, position, and seismic activity on high-value rotating assets such as turbines, compressors, and motors.

Technical Specifications

Ordering Information

When procuring spare parts for a 3500/42M system, verify the specific ordering options to ensure the I/O module matches the rack's termination and barrier requirements.

• Part Number: 135489-01

• AA Ordering Option: 04

• I/O Description: I/O Module with Internal Barriers, Internal Terminations, 4 x Prox/Accel

Engineering & Installation Notes

Field Wiring & Internal Terminations

• Direct Connection: The 135489-01 utilizes internal terminations, meaning field wiring from the transducers is connected directly to the screw terminals on the module body located at the rear of the 3500 rack.

• Hazardous Area Safety: The internal barriers are designed to maintain the integrity of intrinsically safe (IS) circuits. Ensure that wiring segregation is maintained between the IS field wiring and any non-IS cabling within the cabinet.

• Transducer Support: This module is specifically rated for Proximity and Accelerometer inputs. Confirm that the transducer type in the field matches the channel configuration (Channels 1-4) to avoid signal processing errors.

Installation Steps

• Monitor Pairing: This I/O module must be installed in the rear slot of the 3500 rack that corresponds to the front-mounted 3500/42M monitor module.

• Torque Specifications: Ensure all terminal screws are tightened correctly to maintain a stable electrical connection, especially in environments subject to industrial vibration.

• Environmental Compliance: For modules used with internal barriers, the operating temperature must be maintained between 0 deg C and +65 deg C.

FAQ

• Can this I/O module be used for Velomitor transducers?

  The 135489-01 is specified for 4 x Prox/Accel. Use with other transducer types may require a different I/O module variant or specific configuration adjustments within the 3500/42M monitor.

• What is the benefit of the "Internal Barrier" version?

  It integrates safety barriers directly into the I/O module, reducing the physical space required in the cabinet and simplifying the wiring architecture for hazardous area applications.

• Is this module hot-swappable?

  While the 3500 system supports hot-swapping, it is standard engineering practice to bypass any associated machinery trips before replacing an I/O module to prevent unintended shutdowns.