Description

The BENTLY NEVADA 3500/25 149369-01 is a specialized Keyphasor® Reference Module designed for the 3500 Machinery Protection System, serving as the critical timing benchmark for all rotational measurements in monitoring systems. This essential component provides a once-per-turn timing pulse that enables precise phase measurement and synchronous data acquisition for vibration analysis and machinery protection. The 3500/25 149369-01 module processes signals from proximity probes or magnetic pickups to generate a reliable Keyphasor signal that serves as the angular reference point for all phase-related measurements across the monitoring system. Its sophisticated design ensures accurate timing synchronization even in challenging operating conditions with varying speeds and mechanical vibrations.

This advanced monitor module incorporates robust signal conditioning circuitry that can handle inputs from various transducer types while maintaining signal integrity. The BENTLY NEVADA 3500/25 149369-01 features intelligent signal processing algorithms that validate input signals and generate consistent output pulses regardless of minor variations in input signal quality. The module’s design includes comprehensive self-diagnostic capabilities that continuously monitor the health of the module itself as well as the connected sensors and cabling infrastructure. This ensures maximum system reliability and prevents false triggers while maintaining accurate timing references for critical machinery protection functions.

3500/25 149369-01 BENTLY

Technical Specifications

Parameter Name	Parameter Value
Product Model	3500/25 149369-01
Manufacturer	Bently Nevada (a Baker Hughes business)
Product Type	Keyphasor® Reference Module
Number of Channels	2 independent Keyphasor channels
Input Type	Accepts eddy current proximity probes and magnetic pickups
Input Sensitivity	Programmable threshold from -1 VDC to -20 VDC
Frequency Range	0.5 Hz to 15,000 Hz (30 to 900,000 RPM)
Signal Input Range	±60 VDC maximum
Output Signals	TTL compatible pulse, 24 VDC isolated output
Pulse Width	Programmable from 1° to 360° of rotation
Operating Temperature	-30°C to +65°C (-22°F to +149°F)
Power Requirements	+5 VDC @ 800 mA, ±15 VDC @ 50 mA
Accuracy	±0.5° phase accuracy at constant speed
Certifications	ATEX, IECEx, cFM, CSA, and other international standards

Main Features and Advantages

The BENTLY NEVADA 3500/25 149369-01 offers exceptional timing accuracy and reliability through its advanced signal processing architecture. The module features programmable input sensitivity that can be adjusted to accommodate various signal levels from different transducer types, ensuring reliable operation across diverse applications. Sophisticated filtering algorithms reject electrical noise and mechanical vibration artifacts that could interfere with accurate Keyphasor pulse generation. The module’s wide frequency range supports applications from slow-rolling machinery to high-speed turbines, making it suitable for virtually any rotating equipment application.

Advanced Configuration and Diagnostics: The module provides extensive configuration capabilities through the 3500 Framework software, allowing customization of pulse width, trigger levels, and output characteristics to match specific machinery requirements. Built-in continuous self-diagnostics monitor the health of the module itself as well as the connected sensors and cabling, providing early warning of potential system degradation. The module’s non-volatile memory retains all configuration settings, ensuring continuous operation even during power interruptions. Dual-channel capability allows for redundant Keyphasor measurements or monitoring of multiple timing points on the same machine.

Enhanced Integration and Flexibility: The 3500/25 149369-01 seamlessly integrates with the complete 3500 monitoring system, providing timing references for vibration analysis, balancing operations, and machinery protection functions. The module supports multiple output options including TTL-compatible pulses for diagnostic equipment and isolated 24 VDC outputs for control systems. This flexibility allows the module to interface with various plant systems including DCS, PLCs, and diagnostic workstations, providing comprehensive timing synchronization throughout the facility.

Application Field

The BENTLY NEVADA 3500/25 149369-01 is deployed across multiple industries where precise timing references are critical for machinery protection and analysis. In power generation facilities, the module provides essential timing signals for steam and gas turbine monitoring, enabling accurate vibration phase measurement and rotor positioning analysis. The oil and gas industry relies on the 3500/25 149369-01 for critical compression equipment monitoring, where it provides timing references for reciprocating compressor analysis and centrifugal compressor vibration monitoring.

In petrochemical and refining applications, the module provides timing signals for large centrifugal compressors, process pumps, and turbine-driven equipment that require precise phase measurements for balancing and analysis. The module is particularly valuable in applications requiring startup and coastdown analysis, where it provides consistent timing references throughout speed variations. The pulp and paper industry utilizes the 3500/25 149369-01 for monitoring large paper machine rolls and critical rotating equipment. The module’s robust design and certifications make it suitable for hazardous areas and critical applications where accurate timing references are essential for machinery protection and analysis.

3500/25 149369-01 BENTLY

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