Product Identification

Product Series: Bently Nevada 3500 Series

System Type: Machinery Status Monitoring & Protection System

Module Function: Aeroderivative Gas Turbine Vibration Monitor (3500/44M)

General Specifications

Number of Channels:

4 channels total

1 to 4 channels configurable for operation

Dimensions (H × W × D):

241.3 × 24.4 × 241.8 mm

Weight:

Approx. 0.91 kg

Typical Power Consumption:

7.7 W

Sensor Interface & Power

Supported Sensors:

Velomitor® velocity sensors

Accelerometers

Eddy current proximity probes

Interface Modules:

Bently Nevada 86517 / 86497

Sensor Power Supply:

Nominal: 23 VDC

Maximum current: 43 mA

Signal Output Characteristics

Analog Output:

+4 to +20 mA per channel

Proportional to full-scale measurement range

Built-in short-circuit protection

Output Load:

0–600 Ω

Voltage compatibility: 0 to +12 VDC

Frequency Response

Non-integrated acceleration:

4 Hz – 30 kHz (–3 dB)

Integrated acceleration:

18 Hz – 14.5 kHz (–3 dB)

Core Functions and Features
Multi-Channel Vibration Monitoring

Parallel processing of four independent channels

Supports velocity, acceleration, and displacement measurements

Optimized for aeroderivative gas turbine vibration characteristics

Flexible Signal Filtering

Configurable via 3500 Rack Configuration Software

Supported filter options:

Signal integration

1X vibration tracking

Band-pass filtering

Accepts two independent Keyphasor® signals

Each channel pair can be configured with an independent tracking filter

Multi-Mode Alarm Management

Each channel supports up to 8 alarm parameter sets, including:

Warning (Alert) threshold

Danger threshold

Time delay

Alarm sets can be assigned to different operating modes

Mode switching via:

Contact inputs

Software commands through communication gateways

Keyphasor® Phase Coordination

Speed-synchronous vibration tracking

 

BENTLY 3500/44M Aeroderivative Monitor

Enables accurate detection of:

Rotor imbalance

Shaft misalignment

Speed-related vibration faults

Safety and Reliability

Output short-circuit protection

Designed in compliance with API 670

Suitable for high-speed, high-reliability aeroderivative gas turbine applications

Supports redundant and TMR configurations within the 3500 rack framework

Typical Applications

Aeroderivative gas turbines including:

GE LM1600 / LM2500 / LM5000 / LM6000

Rolls-Royce RB211

Other equivalent aeroderivative units