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125800-02

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Bently Nevada 125800-02 is an isolated I/O module matched with the 3500/25 Enhanced Keyphasor Module. Mounted on the rear of the 3500 monitoring rack, it is responsible for connecting field sensor signals and transmitting them to the main module for processing.
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Technical specifications for 125800-02

  • Manufacturer:
    Bently Nevada
  • Part Number:
    125800-02
  • Product Family:
    3500 System
  • Power Consumption:
    3.2 Watts typical
  • Input Impedance:
    21.8 kΩ minimum
  • Output Impedance:
    504 Ω maximum buffered output impedance.
  • Keyphasor Transducer Power Supply:
    -24 Vdc, 40 mA maximum per channel.
  • Speed/ Frequency Signal Accuracy:
    Specified at +25°C (+77°F).
  • Operating Temperature:
    0°C to +65°C (32°F to +150°F)
  • Storage Temperatur:
    -40°C to +85°C (-40°F to +185°F)
  • Humidity:
    95%, non-condensing
  • Rack Space Requirement:
    1 full-height rear slot
  • Weight:
    0.48 kg
  • Estimated shipping dimensions:
    2.5x11.2x24.2cm
  • Tariff Code:
    3305100090
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Efficiency Application Compliance

Features:

  • Provides Isolated Keyphasor Signal Conversion For Machinery Monitoring
  • Supports Multiple Inputs With Reliable Signal Integrity
  • Designed For Easy Installation In 3500 Series Racks
The Bently Nevada 125800-02 is an isolated Keyphasor I/O module engineered to process signals from magnetic pickups and proximity probes, delivering precise timing information to the 3500 machinery monitoring system.

It features robust environmental tolerance with an operating range from 0°C to +65°C and storage from -40°C to +85°C, along with resistance to 95% non-condensing humidity, ensuring reliable performance in demanding industrial environments.

With low power consumption, efficient use of rack space, and internal terminations for simplified wiring, the 125800-02 provides dependable Keyphasor signal transmission while supporting up to eight inputs in paired configurations.

The 125800-02 Bently Nevada Isolated Keyphasor I/O Module (Internal Terminations) may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 125800-02 Isolated Keyphasor I/O Module (Internal Terminations) Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Bently Nevada 125800-02 Isolated Keyphasor I/O Module (Internal Terminations) Specs

General

  • Manufacturer GE / Bently Nevada
  • Model 125800-02
  • Condition New Original ready stock
  • Product Family 3500/25,149369-01,135473-01
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Electrical Isolation Protection: This module provides electrical isolation between channels, effectively preventing ground loops and allowing the same sensor signal to be safely distributed to the 3500 monitoring system and external control systems (such as DCS) without interference.
  • High-Frequency Pulse Processing: Capable of processing signals up to 1,200,000 cpm (20 kHz), it can accurately capture minute speed changes in high-speed rotating machinery (such as high-pressure compressors).
  • Magnetic Sensor Optimization: Circuit optimization for the low-voltage output characteristics of passive magnetic pickups ensures stable trigger pulses across different speed ranges.
  • Simplified Installation with Internal Terminations: Utilizing an "internal terminations" design, signal lines are directly crimped to the terminal blocks on the back of the module, reducing intermediate conversion steps, improving signal transmission efficiency, and lowering potential points of failure.
  • Multi-system Signal Sharing: This isolation module is a standard configuration when a factory requires a single key-phase signal to simultaneously support both the 3500 mechanical protection system (for vibration analysis) and the PLC/DCS system (for logic control or speed display).
  • Complex Electromagnetic Environment Monitoring: In environments with strong electromagnetic interference near large motors or frequency converters, its isolation characteristics ensure the purity of the speed signal, preventing false trips.
  • Turbine and Compressor Monitoring: Widely used in large rotating equipment such as steam turbines, gas turbines, and axial compressors, it provides accurate speed references and phase references for shaft trajectory and spectrum analysis.
  • Overspeed Protection Assistance: As part of the 3500/25 enhanced key-phase system, it provides reliable speed threshold monitoring for critical machinery.
  • SIL 1/2 Certification: This module complies with functional safety standards and supports use in SIL 1 or SIL 2 level Safety Instrumented Systems (SIS), meeting high-reliability industrial safety requirements.
  • Explosion-proof for hazardous areas: Certified by North America (CSA/NRTL/C), Europe (ATEX), and internationally (IECEx), allowing operation in hazardous environments such as Class I, Division 2, or Zone 2.
  • CE marking compliance: Compliant with Electromagnetic Compatibility (EMC) and Low Voltage Directives, ensuring no interference to other equipment in complex industrial power grids and providing excellent immunity.
  • API 670 compliance: As a component of the Bently Nevada 3500 series, its design fully complies with the American Petroleum Institute's API 670 industry standard requirements for mechanical protection systems.
Description
The Bently Nevada 125800-02 Isolated Keyphasor I/O Module is engineered to provide reliable Keyphasor signals for machinery monitoring in the 3500 series framework. Unlike the standard 3500/25 Enhanced Keyphasor Module, which requires external signal conditioning in some installations, the 125800-02 offers internal terminations specifically designed for magnetic pickups, simplifying integration and reducing installation complexity.

This module consumes only 3.2 Watts typical, with a minimum input impedance of 21.8 kΩ and a maximum buffered output impedance of 504 Ω, ensuring stable signal fidelity. Its Keyphasor transducer power supply provides -24 Vdc at 40 mA per channel, allowing it to drive multiple proximity probes or magnetic pickups without additional hardware.

Operating between 0°C to +65°C and storing safely from -40°C to +85°C, the 125800-02 is rated for 95% non-condensing humidity, making it more resilient than some 3500/25 modules in challenging industrial environments. The module requires only one full-height rear slot in the 3500 rack, offering efficient use of space compared to older configurations that may demand more extensive backplane real estate.

In terms of performance, the 125800-02 delivers highly accurate speed and frequency signals at +25°C (+77°F), providing consistent timing for machinery protection systems. Compared to the 3500/25, this model allows up to four Keyphasor inputs in normal configuration and up to eight in paired configurations, offering expanded flexibility for complex monitoring setups.

Overall, the Bently Nevada 125800-02 combines robust environmental tolerance, precise digital signal processing, and simplified installation advantages over the standard 3500/25, making it a superior choice for high-reliability applications where multiple Keyphasor signals are needed.
Alternative Names
125800-01 126648-01 126648-02 125800-01C
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How precise is the speed/frequency signal from 125800-02?
Signals are specified at +25°C (+77°F) for high accuracy, ensuring reliable machinery protection and timing synchronization in comparison to the baseline 3500/25 modules.
Why is rack space efficiency significant for this module?
Requiring only one full-height rear slot, the 125800-02 optimizes space in 3500 racks, leaving room for additional modules without expanding the rack footprint.
How many Keyphasor inputs can 125800-02 handle?
The module supports up to four Keyphasor inputs in normal configuration and up to eight in paired configuration, offering more flexibility than standard 3500/25 modules.
How much power does the 125800-02 consume?
It consumes 3.2 Watts typical, making it more energy-efficient than some older 3500/25 Keyphasor modules.

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