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

• Brand
  Bently Nevada
• Model
  135489-01
• Product Name
  4-Channel I/O Module with Internal Barriers and Internal Terminations
• Dimensions
  241.3 mm height × 24.4 mm width × 163.1 mm depth
• Weight
  0.46 kg
• Place of Origin
  United States
• HS Code
  85389091
• Operating Temperature
  -30 °C to +65 °C
• Storage Temperature
  -40 °C to +85 °C
• Power Supply
  24 VDC
• Warranty
  12 month
• Status
  new and original

Bently Nevada 135489-01 (I/O Module with Internal Barriers for 3500/42M)

Input Features

This module integrates 4 galvanically isolated measurement channels with built-in intrinsic safety barriers, designed for hazardous area field signal acquisition. It is fully compatible with proximity probes, Velomitor velocity transducers and piezoelectric acceleration transducers. It supplies stable regulated -24 VDC excitation voltage with short-circuit current limiting function for 3300XL series proximity probes. Every channel adopts a standard 10 kΩ input impedance, ensuring high-fidelity collection of various vibration and position signals, including radial vibration, thrust position, differential expansion, shaft eccentricity, vibration acceleration, vibration velocity and shaft absolute position parameters.

Output Features

Each channel is equipped with a coaxial buffered transducer output, featuring 550 Ω output impedance and built-in short-circuit protection for stable signal debugging and external analysis. It provides high-precision isolated 4-20 mA DC analog output, which linearly corresponds to the full-scale measured process variables for seamless connection with industrial control systems. The module converts analog field signals into digital data, and uploads real-time measurement values, alarm status and self-diagnostic information to the 3500 rack backplane bus. It outputs Alert and Danger alarm logic signals to support external relay protection systems. The module is powered by the 3500 rack backplane bus with a typical power consumption of 7.7 W, ensuring stable and long-term industrial operation.

Wiring Instructions for Bently Nevada 135489-01 (I/O Module with Internal Barriers for 3500/42M)

General Wiring Requirement

The 135489-01 is a rear-mounted termination I/O module with built-in intrinsic safety barriers, specially designed for hazardous area field wiring. All field transducer cables from hazardous areas are directly terminated to the rear screw terminals of the module. This I/O module must be used in conjunction with the front 3500/42M monitor module. A dedicated 3500 intrinsic safety grounding module is required within the same rack to provide reliable grounding for intrinsic safety circuits. All wiring operations must be performed with strict ESD protection and the entire rack system powered off. The recommended wire cross-section ranges from 0.2 mm² to 1.5 mm², with a maximum stripping length of 6 mm to prevent exposed bare conductors and short-circuit risks.

Proximity Probe Transducer Wiring (-24 VDC Excitation Loop)

Connect the complete proximity probe assembly (probe plus extension cable) to the corresponding channel terminals. The module provides current-limited, regulated -24 VDC excitation power for 3300XL series proximity probes. Strictly follow polarity requirements for all signal and excitation loops during wiring. Avoid cross-channel wiring confusion and ensure the total cable length of each probe system complies with the original factory matching specifications to guarantee accurate measurement performance.

Velomitor / Piezoelectric Acceleration Transducer Wiring

For Velomitor velocity transducers and piezoelectric acceleration sensors, connect the signal paired wires and shielding wires to the designated channel terminals. These passive sensors require no external excitation power supply. Maintain correct signal polarity for all vibration input loops to ensure effective and accurate signal acquisition.

Buffered Output & 4-20 mA Analog Recorder Output Wiring

Buffered Transducer Output: Each channel is equipped with a coaxial interface for raw vibration signal output. Connect BNC coaxial cables to oscilloscopes or external vibration analysis devices. Keep coaxial cables short and physically separated from high-power power cables to avoid signal interference.

4-20 mA Analog Recorder Output: Wire the analog output terminals to DCS or PLC analog input channels. Strictly follow loop polarity and ensure the external load resistance is within the module’s allowable range. The isolated 4-20 mA current output provides linear signals corresponding to full-scale process measurement values for remote system monitoring and recording.

Cable Routing & Intrinsic Safety Wiring Rules

Maintain a minimum 50 mm physical separation between intrinsically safe (IS) hazardous area cables and non-intrinsically safe (non-IS) safe-area cables inside cabinets and cable trays. Install insulating partitions if cables are laid in the same tray. Follow the standard routing principle: arrange IS hazardous-area cables above the 3500 rack and non-IS safe-area cables below the rack. All transducer cable shields shall adopt single-point grounding at the rack-side non-hazardous terminal, with no grounding at the field sensor side to eliminate ground loop interference. Instrument signal cables must not be laid in parallel with high-voltage and high-power load cables.

Backplane & IS Earthing Connection

The module communicates with the front 3500/42M monitor through the rack backplane connector; ensure the backplane connector is fully and securely engaged after installation. A dedicated IS grounding module must be installed in the same rack. Connect the 3500 rack chassis to the plant single-point protective ground. Strictly isolate intrinsically safe circuit grounding from non-IS instrument grounding to prevent ground loop faults and signal distortion.

Post-wiring Check

Retighten all rear terminal screws to adapt to on-site vibration environments. Inspect all wiring points to eliminate short circuits, open circuits and reverse polarity connections. Verify all intrinsic safety cable separation and wiring specifications are fully complied with. Complete comprehensive wiring inspection and confirmation before rack power-on and system configuration.

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