Bently Nevada 3500/40 135489-04 Proximitor® Monitor

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Bently Nevada 3500/40 135489-04

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Key Features

• 4 Independent Input Channels – Accepts signals from up to 4 Bently Nevada proximity transducers 

• Integrated Intrinsic Safety Barriers – Built-in barriers for hazardous area installations (Zone 1/Zone 2) reduce panel space and wiring complexity 

• User-Programmable Alarms – Alert and Danger thresholds configurable per channel via 3500 Rack Configuration Software 

• Multi-Function Channel Pairing – Channels 1–2 and 3–4 can be independently configured for different functions simultaneously 

• Programmable Measurement Functions – Supports Radial Vibration, Thrust Position, Differential Expansion, Eccentricity, and REBAM 

• Front Panel Buffered Outputs – Coaxial connectors per channel for diagnostic signal access 

• Front Panel LEDs – OK, TX/RX, and Bypass for status indication 

• Hot-Swap Capable – Tool-free insertion and removal without system shutdown 

Technical Parameters

Core Advantages

1. Integrated Intrinsic Safety Barrier

The 135489-04 variant distinguishes itself with a built-in internal safety barrier, certified for hazardous area installations . This eliminates the need for external Zener barriers or isolators, reducing panel space, wiring complexity, and potential failure points. Energy levels are safely limited before reaching field sensors while maintaining full signal integrity .

2. Flexible Multi-Function Configuration

Unlike single-purpose monitors, the 3500/40 allows software-configurable channel pairing. Channels 1–2 and 3–4 can be independently programmed to perform different measurement functions simultaneously . A single module can monitor radial vibration on one pair and axial displacement on the other, or handle differential expansion and eccentricity measurements simultaneously. This reduces spare parts inventory and simplifies system design for complex machinery trains .

3. High-Precision Signal Conditioning

Delivers exceptional measurement accuracy of ±0.33% of full scale for direct, gap, 1X, and 2X parameters . Advanced signal conditioning automatically compensates for sensor nonlinearities. The module's filtering algorithms and dual-voting logic effectively filter electrical noise, preventing nuisance trips .

4. Seamless System Integration

Fully compatible with the Bently Nevada 3500 series framework and System 1 software for advanced diagnostics . Supports redundant configurations for high-availability applications .

5. Robust Industrial Design

Built to withstand harsh environments with wide temperature tolerance (-30°C to +65°C), vibration resistance, and corrosion-resistant construction . Designed for continuous operation in power plants, petrochemical facilities, and offshore platforms.

Applications

Primary Applications

• Radial Vibration Monitoring – Shaft relative vibration measurement in turbines, compressors, and pumps 

• Thrust Position / Axial Displacement – Preventing thrust bearing wear and rotor rub 

• Differential Expansion – Monitoring thermal growth between rotor and casing 

• Eccentricity – Measuring shaft bow during slow-roll conditions 

• REBAM – Rolling Element Bearing Monitoring 

Industry Applications

Recommended Models & Ordering Information

The 3500/40 is available in multiple I/O module configurations. Below are common variants for reference:

Frequently Asked Questions (FAQ)

Q1: What is the difference between 135489-04 and other 3500/40 variants?

The 135489-04 features internal safety barriers and internal terminals . This design is specifically intended for hazardous area installations, eliminating the need for external Zener barriers . Other variants may have internal terminals without barriers (125680-01) or external terminals (126615-01) .

Q2: How many channels does the 3500/40 provide?

It provides 4 independent input channels .

Q3: What measurement functions can be programmed?

The module can be programmed for Radial Vibration, Thrust Position, Differential Expansion, Eccentricity, or REBAM . Channels are configured in pairs (1-2 and 3-4) to perform up to 2 functions simultaneously .

Q4: Does this module meet API 670 requirements?

Yes, the 3500/40M series is designed to meet or exceed API 670 standards for machinery protection systems .

Q5: What is the accuracy of the module?

Accuracy is ±0.33% of full scale (typical) and ±1% (maximum) for Direct, Gap, 1X, and 2X measurements .

Q6: Can I replace the module without shutting down the system?

Yes, the module supports tool-free insertion and removal, minimizing system downtime .

Q7: What sensors are compatible with this module?

Compatible with Bently Nevada proximity transducers, including 3300 and 7200 series probes (5mm, 8mm, 11mm, and 14mm sizes) . Sensitivity is programmable (typically 7.87 V/mm or 200 mV/mil) .

Q8: What certifications does the 135489-04 carry?

Certifications include CE, CSA, ATEX, FM (optional), and compliance with SIL 2 and API 670 .

Q9: What is the temperature rating?

The module operates from -30°C to +65°C (-22°F to +149°F) .

Q10: Does the module provide buffered sensor outputs?

Yes, the front panel has one coaxial connector per channel providing buffered transducer outputs for diagnostic testing. Each connector is short-circuit protected.