Bently Nevada 125800-01
Bently Nevada 125800-01
Bently Nevada 125800-01
Bently Nevada 125800-01
Bently Nevada 125800-01
Bently Nevada 125800-01
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125800-01

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Bently Nevada 125800-01 is a non-isolated Keyphasor I/O module designed for precise speed and phase signal acquisition in 3500 systems.
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Technical specifications for 125800-01

  • Manufacturer:
    Bently Nevada
  • Part Number:
    125800-01
  • Product Family:
    3500 System
  • Product Type:
    Keyphasor I/O Module
  • Stock:
    1
  • Speed/ Frequency Signal Accuracy:
    Specified at +25°C (+77°F).
  • Storage Temperatur:
    -40°C to +85°C (-40°F to +185°F)
  • Operating Temperature:
    0°C to +65°C (32°F to +150°F)
  • Keyphasor Transducer Power Supply:
    -24 Vdc, 40 mA maximum per channel.
  • Humidity:
    95%, non-condensing
  • Rack Space Requirement:
    1 full-height rear slot
  • Weight:
    0.38 kg
  • Estimated shipping dimensions:
    2.5x11.2x24.2cm
  • Tariff Code:
    3902100090
  • 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 Safety and Compliance Performance Application

Features:

  • Non-Isolated Keyphasor Module Provides Direct Sensor Signal Acquisition.
  • Built-In Terminal Block Simplifies Field Installation And Wiring.
  • High Phase Accuracy Ensures Reliable Speed And Vibration Data.
The Bently Nevada 125800-01 Keyphasor I/O Module delivers robust performance for machinery monitoring applications. Its design accommodates multiple proximitors, providing precise phase and speed signals critical for rotor balancing and dynamic analysis. The module operates reliably in industrial environments, withstanding temperatures from 0°C to +65°C and high humidity up to 95% non-condensing.

With internal terminations, sensor cables connect directly to the module without additional terminal boxes, reducing installation time and minimizing potential connection errors. Each channel supplies -24 Vdc at up to 40 mA, supporting diverse sensor configurations while maintaining low overall power consumption of 3.2 Watts.

The 125800-01 is rack-compatible with one full-height rear slot and features input and output impedance specifications optimized for accuracy. Its stable signal processing and compact design make it ideal for continuous monitoring tasks, ensuring reliable data capture for maintenance and operational decision-making.

The 125800-01 Bently Nevada Keyphasor I/O Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Bently Nevada 125800-01 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 125800-01 Keyphasor I/O Module Specs

General

  • Manufacturer GE / Bently Nevada
  • Model 125800-01
  • Condition New Original ready stock
  • Product Family 149369-01,135473-01,126648-01
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.
  • API 670 Compliance: This module is designed in full compliance with the American Petroleum Institute (API) 670 standard, a globally recognized industry standard for machine protection systems, ensuring reliability in critical rotating machinery.
  • Hazardous Area Certification: Certified by multiple international explosion-proof standards including ATEX, IECEx, and CSA/NRTL/C, allowing installation in Class I, Division 2, or Zone 2 hazardous explosive environments.
  • Functional Safety Support: As part of the 3500/25 Enhanced Keyed Phase System, it supports SIL 1 to SIL 2 Safety Instrumented Systems (SIS), meeting plant functional safety integrity requirements.
  • Electromagnetic Compatibility (EMC): Strictly compliant with EMC directives under the CE marking, possessing strong immunity to radio frequency interference and surge protection, ensuring signal integrity in complex substation or generator room environments.
  • Extremely High Phase Accuracy: Due to its non-isolated design, the signal path eliminates electronic delays caused by isolation circuits, providing the purest phase reference and making it a core component for precise dynamic balancing analysis.
  • Ultra-Wide Frequency Response: Supports pulse frequencies from 1 cpm to 1,200,000 cpm (20 kHz), enabling precise synchronization capture in both extremely low-speed turning gear operation and extremely high-speed turbomachinery.
  • Simplified Wiring with Internal Terminations: The internal terminations design allows field sensor cables to connect directly to the I/O module on the back of the frame, reducing the need for external junction boxes and cable jumpers, significantly shortening installation time and reducing the risk of poor contact.
  • Optimized for Proximity Probes: The circuitry is specifically calibrated for the negative voltage pulse signals generated by the proximitor, ensuring a stable trigger threshold and effectively filtering high-frequency noise in the signal.
  • Critical Equipment Mechanical Protection: Primarily used for speed monitoring of Class A critical equipment such as steam turbines, centrifugal compressors, and large motors, providing a phase reference for vector analysis of shaft vibration and displacement.
  • Mechanical Fault Diagnosis and Analysis: In applications requiring 1X and 2X spectrum analysis, orbit plotting, and Bode plot analysis, the 125800-01 is an indispensable phase reference source.
  • High-Precision Dynamic Balancing Correction: Due to its extremely small phase offset, it is the preferred I/O module for technicians performing on-site rotor dynamic balancing correction.
  • Standard Factory Configuration: In applications where signal sharing with external third-party systems is not required (no isolation needed) and the signal source is a standard eddy current sensor, it is the most versatile and cost-effective key phase interface solution for the 3500 system.
Description
The Bently Nevada 125800-01 Keyphasor I/O Module is engineered as a standard non-isolated interface for the 3500 system, specifically designed to complement the 3500/25 enhanced Keyphasor module. Unlike its isolated counterpart, the 125800-02, this module receives sensor signals directly, ensuring minimal phase delay and optimized accuracy in dynamic balancing and speed monitoring applications. 

The 125800-01 operates over a temperature range of 0°C to +65°C (32°F to +150°F) and can be stored safely between -40°C and +85°C (-40°F to +185°F). With a maximum humidity tolerance of 95% non-condensing, the 125800-01 performs consistently in industrial environments. The Keyphasor transducer power supply provides -24 Vdc at up to 40 mA per channel, supporting multiple sensor inputs efficiently. 

Compared with the Bently Nevada 125800-02, which features isolated circuitry for high EMI environments, the 125800-01 emphasizes raw signal fidelity and phase precision, making it ideal for systems where environmental interference is minimal. It shares the same full-height rear slot form factor as other 3500 I/O modules, allowing seamless integration with existing racks. 

The 125800-01 supports a variety of proximitors and speed/frequency sensors and is widely deployed in machinery monitoring, rotor balancing, and vibration analysis applications. Its combination of non-isolated design, internal terminations, and high phase accuracy makes it a reliable choice for both new installations and legacy system upgrades within the 3500 platform.
Alternative Names
149369-01 126648-01 125800-02 126648-02 135473-01 1258OO-O1 I25800-0I 125800 01
Technical notes
The Bently Nevada 125800-01 Keyphasor I/O Module (Internal Terminations) is the base rear interface card for the Bently Nevada 3500/25 enhanced keyphasor system. It can receive timing input signals once per revolution from magnetic pickups or proximity probes, with an input signal range of +0.8V to -21.0V (non-isolated signal input window).
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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 does 125800-01 differ from 125800-02?
The 125800-01 is non-isolated, offering direct signal transmission with minimal phase delay, while 125800-02 includes isolation circuitry to reduce EMI effects in harsh environments.
How does 125800-01 support TMR applications?
In TMR setups, two 125800-01 modules can run in parallel, providing both primary and secondary Keyphasor signals to other rack modules, similar to configurations using the 149369-01 module.
What is the power requirement for the Keyphasor transducers on 125800-01?
Each channel receives -24 Vdc with a maximum current of 40 mA, sufficient for multiple sensor connections.
Can 125800-01 replace older Keyphasor modules?
Yes, it works seamlessly with legacy systems and can complement or replace modules like the PWA 125792-01, and is downward-compatible with existing 3500 Keyphasor modules.

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