Description

Product Description

The Bently Nevada 3500/25 125792-01 Enhanced Keyphasor® module is a dual-channel, half-height timing and speed reference unit designed for the 3500 machinery protection platform. It processes raw shaft-related signals from proximity probes or magnetic pickups and converts them into structured digital timing pulses used across the monitoring system.

These Keyphasor outputs provide a stable rotational reference required for advanced vibration diagnostics, including phase-based analysis and speed-dependent measurement functions. The module is commonly deployed in systems requiring high-resolution rotational tracking and multi-channel synchronization.

This version is also backward compatible with earlier Keyphasor implementations and is positioned as a legacy precursor to newer 149369-01 revisions.

Signal Processing Functionality

• Converts analog shaft signals into digital Keyphasor pulse streams

• Provides dual independent input processing channels

• Supplies precise rotational reference signals to the 3500 rack

• Ensures synchronized phase alignment across monitoring modules

• Supports redundant timing architectures for high-reliability systems

Measurement & Diagnostic Capabilities

• Shaft rotational speed calculation up to high-speed machinery ranges

• Phase angle measurement for rotor dynamic analysis

• 1X vibration amplitude and vector-based diagnostics

• Order tracking for variable-speed machinery

• Supports synchronous waveform analysis across multiple channels

Input / Output Characteristics

Input ranges:

• Non-isolated configuration: +0.8 V to +21 V

• Isolated configuration: +5 V to –11 V

Outputs:

• Digital Keyphasor pulse signal

• Front-panel buffered coaxial output

• Rear Euro-style terminal output

Sensor compatibility:

• Proximity probe systems

• Magnetic pickup transducers

Performance Specifications

• Speed measurement range: 0 to 99,999 RPM

• Magnetic pickup operational threshold: >200 RPM

• Measurement accuracy: ±0.05%

• Resolution: 0.1 RPM

• Sampling rate: 1 kHz per channel

• Phase deviation:

• <1° typical (non-isolated mode)

• <3° typical (isolated mode)

Electrical Characteristics

• Supply voltage: -24 VDC via rack backplane

• Current draw: up to 40 mA per channel

• Typical power consumption: ~3.2 W

Processing & Diagnostics

• 32-bit RISC processing architecture

• Onboard non-volatile memory for firmware and event storage

• Field-upgradable firmware support

• Continuous diagnostic self-monitoring capability

Mechanical Design

• Half-height module format for 3500 rack systems

• Front slot installation within rack chassis

• Rear I/O interface for signal termination

• Physical dimensions: 170 × 105 × 32 mm

Environmental Ratings

• Operating temperature:

• Non-isolated: -30°C to +65°C

• Isolated: 0°C to +65°C

• Storage temperature: -40°C to +85°C

• Relative humidity: up to 95% non-condensing

• Mechanical shock tolerance: 15 g (11 ms pulse)

• Vibration tolerance: 2 g across 5–500 Hz range

System Integration

• Provides master timing reference for 3500 monitoring rack

• Compatible with all vibration modules including 3500/40M, 3500/42M, and 3500/45M

• Required for phase-based vibration analysis and order tracking applications

• Supports redundant and TMR system architectures

• Enables synchronized data acquisition during transient events

FAQ

Q1: Is this module compatible with newer Keyphasor designs?
Yes. It is backward compatible and serves as a predecessor to newer revisions such as 149369-01.

Q2: Can it operate in redundant configurations?
Yes. It supports paired and TMR architectures for high-availability systems.

Q3: Does it contribute to protection logic?
No. It provides timing reference signals only and is not part of the protection path.

Specifications

• Brand: Bently Nevada

Advantages

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