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The 125800-01 is an industrial automation component developed by Bently Nevada, specifically an I/O module for the 3500/25 enhanced key phase module.
Simplify system hardwiring design
Standard digital Keyphasor signals
Precisely capture shaft speed and phase reference information
The Bently Nevada 3500/25 Enhanced Keyphasor Module is a half-height, two-channel module used to provide Keyphasor signals to the monitor modules in a 3500 rack. The module receives input signals from proximity probes or magnetic pickups and converts the signals to digital Keyphasor signals that indicate when the Keyphasor mark on the shaft coincides with the Keyphasor transducer. The 3500 Machinery Protection System can accept up to four Keyphasor signals for normal configuration and up to eight Keyphasor signals in a paired configuration.The Enhanced Keyphasor Module is an improved 3500 system module. It offers expanded Keyphasor signal processing capabilities over the previous design while maintaining complete downward-compatibility in terms of form, fit and function with existing Keyphasor modules for use in legacy systems.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 125800-01 Keyphasor I/O Module Manuals, Datasheets, Drivers, 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.
Thermal Power
Provides the absolute phase reference for large supercritical steam turbine-generator shafts to track transient vibration changes during startup and shutdown.
Petrochemical & Oil
Deployed on multi-stage centrifugal compressors and ethylene crackers to detect rotor unbalance and misalignment through 1X/2X vector tracking.
Liquefied Natural Gas
Monitors high-speed mixed refrigerant turbo-compressor trains to prevent critical shaft rubs and structural instability at cryogenic temperatures.
Nuclear Power
Ensures high-reliability, continuous phase telemetry for primary reactor coolant pumps (RCP) and high-pressure safety injection pumps.
Pulp & Paper
Monitors the mechanical health and shaft synchronization of high-speed vacuum pumps and massive paper machine drying cylinder drives.
When using the 125800-01 Keyphasor I/O module, keep these key points in mind. ESD Prevention & Isolation—the PCB components are exposed, so always wear an ESD wrist strap before handling, and ensure no external high voltage is present during wiring. Sensor Pairing & Polarity—strictly follow the internal terminal diagram to connect proximity probes or magnetic pickups, paying close attention to the -24VDC power supply polarity. Signal Parameter Tuning—you must correctly configure the Threshold and Hysteresis in the software based on actual shaft notch depth to prevent signal noise from causing speed spikes or missing phase pulses.
What is the purpose of the Keyphasor function in 125800-01?
It acts as the
How many physical channels are supported by the 125800-01 module?
The module provides 2 independent sensor input channels (Channel 1 and Channel 2), allowing up to 4 modules (8 channels total) per 3500 rack.
What types of sensors can be connected to 125800-01?
It primarily supports Bently Nevada Proximity Probe systems or third-party Magnetic Pickups.
Which front main card must 125800-01 pair with to operate?
It must be paired with the front-facing 149369-01 (3500/25 Enhanced Keyphasor Main Module) via the internal rack backplane.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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