Description

Product Description

The Bently Nevada 3500/42-09-05 is a four-channel machinery protection module engineered for continuous monitoring of vibration, shaft displacement, and casing dynamics in critical rotating equipment. It is part of the 3500 protection platform and is designed for environments requiring certified hazardous-area operation.

This version incorporates Type 09 I/O architecture and Option 05 hazardous location compliance, making it suitable for installations in ATEX / IECEx / CSA Class I, Zone 2 classified areas.

System Function Overview

The module processes signals from multiple sensor types and converts them into calibrated mechanical condition data used for protection and diagnostics.

Supported measurement outputs include:

• Shaft radial vibration

• Axial thrust position

• Shaft eccentricity tracking

• Differential expansion monitoring

• Casing velocity vibration

• Acceleration response

• REBAM vibration analysis

• Shaft absolute and orbit-based evaluation

• Circular acceptance region diagnostics

Each channel pair can be configured to execute dual measurement functions, enabling flexible protection logic for complex machine behavior.

Input Architecture

• Total channels: 4 independent inputs

• Supported transducers:

• Proximitor displacement probes

• Velomitor velocity sensors

• Accelerometers

• HTVS sensor variants

• Input impedance:

• 10 kΩ (proximity and acceleration measurement paths)

• Designed for direct integration with 3500 rack I/O termination system

Signal Processing & Filtering

• Direct frequency response:

• 4 Hz to 4000 Hz (standard mode)

• 1 Hz to 600 Hz (low-frequency configuration)

• Gap filter: −3 dB at ~0.09 Hz (baseline drift suppression)

• Not-1X rejection band: 60 cpm to 15.8× running speed, ~−34.9 dB attenuation

• Vector filtering (1X / 2X):

• Constant-Q design

• High out-of-band rejection (~−57.7 dB typical)

Measurement Scaling

• Radial / thrust / eccentricity:

• 3.94 or 7.87 mV/µm

• Differential expansion:

• 0.394 or 0.787 mV/µm

• REBAM mode:

• 40 or 80 mV/µm

• Acceleration input:

• 10 mV/(m/s²) ≈ 100 mV/g

• Velocity input:

• Multiple scaling options: 20 / 5.8 / 4 mV/(mm/s) peak

Outputs & Diagnostics

• Buffered analog output per channel (coaxial interface)

• Output protection: short-circuit resistant

• Front-panel indicators:

• System status (OK)

• Communication activity (TX/RX)

• Bypass mode indication

• No onboard relay outputs; external relay modules required for alarm switching

Environmental & Safety Compliance

• Hazardous area approvals:

• ATEX

• IECEx

• CSA Class I, Zone 2 (Option 05)

• Designed for use in industrial machinery protection systems in classified environments

• High-reliability operation under continuous monitoring duty cycles

Accuracy & Performance

• Measurement accuracy:

• ±0.33% typical

• ±1% maximum under full operating range

• Stable long-term signal conditioning for predictive maintenance applications

• High-resolution digital processing for vibration and displacement integrity

Mechanical Characteristics

• Module format: 3500 Series rack-mounted card

• I/O type: Type 09 Prox/Velom I/O with internal termination

• Installation: hot-swappable within compatible rack systems

• Designed for high-density monitoring configurations

Typical Applications

• Gas and steam turbines

• Centrifugal compressors

• Pumps and process equipment

• Offshore and refinery rotating machinery

• Power generation monitoring systems

FAQ

Q: Is this module suitable for hazardous locations?
A: Yes. Option 05 provides ATEX / IECEx / CSA Zone 2 certification for classified environments.

Q: Can it process both proximity and seismic signals?
A: Yes. It supports mixed sensor inputs including proximity probes, velocity, and acceleration transducers.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems