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135489-01
135489-01
135489-01

Bently Nevada 135489-01 4-Channel Prox/Accel I/O Module

  • Model: 135489-01
  • Brand: Bently Nevada
  • Series: 3500 Machinery Protection System
  • Core Function: Four-channel proximity/acceleration signal interface
  • Product Type: I/O Module with Internal Barriers
  • Key Specs: 4 channels; Prox/Accel inputs; internal terminations
  • Monitor: 3500/42M Proximitor Seismic Monitor
  • I/O Configuration: Ordering Option 04
  • Condition: New Original / New Surplus

The OEM 3500/42M documentation identifies 135489-01 as the I/O module with internal barriers and internal terminations for four Prox/Accel channels.

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Description

Key Technical Specifications

Parameter Value
Manufacturer Bently Nevada
Part Number 135489-01
System 3500 Machinery Protection System
Monitor 3500/42M Proximitor Seismic Monitor
Ordering Option 04
Module Type I/O Module with Internal Barriers
Termination Type Internal Terminations
Number of Channels 4
Supported Transducers Proximity / Acceleration
Channel Assignment Prox/Accel on channels 1 through 4
Typical Power Consumption 7.7 W
Supply Current ≤300 mA
Recorder Output 4–20 mA
Recorder Output Resolution 0.3662 µA/bit
Input Impedance ≥10 kΩ for analog inputs
Channel Isolation 500 VDC
Operating Temperature -30 to +65 °C
Humidity Up to 95%, non-condensing
Dimensions 241.3 × 24.4 × 163.1 mm
Dimensions 9.50 × 0.96 × 6.42 in
Approx. Weight 0.46 kg / 1.01 lb

The current Bently Nevada/Baker Hughes datasheet lists 135489-01 under 3500/42M I/O Module Type 04 and specifies four Prox/Accel channels with internal barriers and internal terminations.

The physical dimensions and weight above correspond to the barrier-type 3500/42M I/O modules.

 

Product Introduction

The Bently Nevada 135489-01 is a four-channel I/O module for the 3500/42M Proximitor Seismic Monitor. It provides internal barriers and internal terminations for four Prox/Accel transducer channels, making it the appropriate I/O configuration for applications using proximity or acceleration sensors on channels 1 through 4.

The important ordering distinction is the internal-barrier/internal-termination configuration. The 135489-02 and 135489-03 use different transducer allocations, while 128229-01 and 128240-01 have different termination arrangements. Do not substitute these parts based only on the 3500/42M designation.

135489-01

135489-01

135489-01

135489-01

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation

Estimated time: 5–8 minutes

⚠️ Safety First: The 135489-01 interfaces with machinery-monitoring transducers and may be installed in equipment associated with hazardous-area instrumentation. Follow the site’s electrical isolation, machinery shutdown, and LOTO procedures before removing the module.

Tools Required

  • ESD wrist strap
  • Appropriate screwdriver
  • Digital multimeter
  • Wire labels
  • Smartphone or camera
  • Approved 3500 system documentation

Data Backup

  1. Record the existing 3500/42M monitor configuration.
  2. Photograph the front and rear of the existing monitor/I/O assembly.
  3. Record the channel assignments.
  4. Record the transducer type connected to each channel.
  5. Photograph all terminal wiring before disconnecting it.
  6. Record alarm setpoints and configuration data where applicable.
  7. Confirm that the installed I/O is actually 135489-01.

⚠️ The transducer type matters. The 135489-01 is specifically designated for four Prox/Accel channels. Do not assume that any 3500/42M I/O module can replace it.

Stage 2: Removing the Old Module

Estimated time: 5 minutes

  1. Place the machinery protection system in the approved maintenance state.
  2. Isolate power where required by the site’s maintenance procedure.
  3. Identify the 3500/42M monitor and associated I/O module.
  4. Verify the existing part number.
  5. Photograph the terminal arrangement.
  6. Label each transducer connection by channel.
  7. Disconnect the field wiring carefully.
  8. Release the applicable retention hardware.
  9. Pull the I/O module straight out without forcing the mating connector.
  10. Inspect the connector and surrounding rack area for contamination or physical damage.

⚠️ Keep the removed module until the replacement has completed functional testing. It provides a useful reference if a wiring or configuration discrepancy appears.

Stage 3: Installing the New Module

Estimated time: 5–8 minutes

  1. Verify the replacement is Bently Nevada 135489-01.
  2. Confirm the system requires the 3500/42M Type 04 I/O configuration.
  3. Confirm that channels 1–4 are intended for Prox/Accel transducers.
  4. Inspect the replacement connector and module body.
  5. Install the I/O module into the designated 3500/42M position.
  6. Do not force the connector. If seating requires excessive force, stop and inspect alignment.
  7. Reconnect each transducer according to the photographs and wiring documentation.
  8. Verify cable shielding and grounding against the approved installation drawing.
  9. Secure all retaining hardware.

Self-Checklist

  • 135489-01 verified
  • 3500/42M compatibility verified
  • Four Prox/Accel channels confirmed
  • Internal termination configuration confirmed
  • Channel wiring matched
  • Shielding restored
  • Connector fully seated
  • Retaining hardware secured

⚠️ Do not substitute 135489-02 or 135489-03 simply because the physical modules look similar. The transducer allocation differs between these part numbers.

Stage 4: Power-On & Testing

Estimated time: 10–15 minutes

  1. Perform a complete wiring inspection before applying power.
  2. Verify that the transducer wiring is correctly assigned to channels 1–4.
  3. Restore power according to the approved 3500 startup procedure.
  4. Observe the 3500/42M front-panel OK indicator.
  5. Verify that the monitor communicates with the rest of the 3500 rack.
  6. Check each channel for a valid transducer signal.
  7. Compare measured values against expected machinery conditions.
  8. Verify alarm status and configured trip thresholds.
  9. Check the 4–20 mA recorder outputs if those outputs are used.
  10. Confirm that the control room/DCS receives the expected monitoring information.
  11. Record the replacement serial number and final test results.

The 3500/42M provides front-panel OK, TX/RX, and Bypass indicators, plus buffered transducer outputs and 4–20 mA recorder outputs. These are useful during post-replacement verification.

⚠️ If the 3500/42M reports an invalid channel after replacement, check the sensor type, wiring, channel assignment, and I/O module type before adjusting alarm settings.

 

Frequently Asked Questions (FAQ)

1. What is Bently Nevada 135489-01?

135489-01 is a four-channel I/O module for the Bently Nevada 3500/42M Proximitor Seismic Monitor. It uses internal barriers and internal terminations and is designed for four Prox/Accel channels.

2. What transducers can the 135489-01 handle?

The OEM ordering information specifies Prox/Accel on channels 1 through 4. If your existing installation uses Velomitor sensors, do not automatically substitute this module. The 135489-02 and 135489-03 have different channel allocations.

3. Is 135489-01 the same as 135489-02?

No. Both are barrier-type 3500/42M I/O modules, but their channel assignments differ. 135489-01 = four Prox/Accel channels; 135489-02 = two Prox/Accel channels plus two Velomitor channels.

4. Can an external termination block be used with 135489-01?

No. The 135489-01 is specified with internal terminations. The OEM documentation specifically distinguishes internal-termination I/O modules from modules intended for external termination blocks.

5. Will replacing the 135489-01 erase my 3500/42M configuration?

The I/O module itself is not the main monitor’s configuration storage. Nevertheless, document the existing configuration before replacement. After installation, verify channel assignments, transducer settings, alarm thresholds, and monitor status before returning the machinery protection system to service.

6. What should I verify before ordering 135489-01?

At minimum, verify the existing 3500/42M monitor, the exact I/O part number, the Type 04 configuration, four Prox/Accel channel requirements, and the internal-termination arrangement. The OEM documentation lists several physically related 3500/42M I/O options, so ordering by “3500/42M I/O module” alone is not precise enough.

7. Is 135489-01 still available as new original stock?

Availability varies by supplier and inventory source. Current supplier listings show both new-original and in-stock claims, while other listings show longer lead times for complete 3500/42M assemblies. Ask for the exact 135489-01 label photograph, condition, revision, and test documentation before purchasing critical spare stock.

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