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        126648-01

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        The Bently Nevada 126648-01 is a half-height 3500/25 Enhanced Keyphasor I/O module that converts raw proximity or magnetic pickup signals into digital Keyphasor signals for accurate speed and phase monitoring.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 126648-01

        • Manufacturer:
          Bently Nevada
        • Part Number:
          126648-01
        • Product Family:
          3500 System
        • Power Consumption:
          3.2 Watts typical
        • Signal:
          Each Keyphasor Module accepts up to two transducer signals from proximity probe transducers or magnetic pickups. The input signal range is +0.8 V to -21.0 V (NonIsolated I/O modules) or +5V to -11V (Isolated I/O modules). Signals exceeding this range are limited internally by the module. Passive magnetic pickups require a shaft rotative speed greater than 200 rpm (3.3 Hz).
        • 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.
        • Operating Temperature:
          -30°C to +65°C (-22°F to +150°F)
        • Storage Temperature:
          -40°C to +85°C (-40°F to +185°F)
        • 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:
          8518290000
        • 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 Application Control Connection

        Features:

        • Converts Raw Signals From Proximity Probes Or Magnetic Pickups Into Digital Keyphasor Signals
        • Provides Reliable Speed And Phase Reference To 3500 Monitor Modules
        • Supports Easy Installation With External Terminal Connections
        The Bently Nevada 126648-01 Keyphasor I/O Module is a half-height module designed to deliver accurate Keyphasor signals for the 3500 Series Mechanical Protection System. It receives input from proximity probes or magnetic pickups and transforms these raw signals into digital Keyphasor outputs, providing essential speed and phase information to monitor modules.

        This module is engineered for industrial environments, with the ability to operate over a wide temperature range and high humidity. Its robust electrical characteristics include high input impedance, buffered output impedance, and dedicated power supply for Keyphasor transducers, ensuring consistent signal quality under demanding conditions.

        Installation is straightforward, requiring a single full-height rear slot in a 3500 rack. The external terminal connections simplify wiring and integration, and the module supports normal or paired configurations to provide multiple Keyphasor signals, allowing flexible setup for comprehensive machinery monitoring.

        The 126648-01 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 126648-01 Keyphasor I/O Module 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 126648-01 Keyphasor I/O Module Specs

        General

        • Manufacturer GE / Bently Nevada
        • Model 126648-01
        • Condition New Original ready stock
        • Product Family 3500/25,126648-01C,126648-01D
        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.
        • Multi-system signal sharing: When multiple monitoring systems (such as unit protection systems and external diagnostic platforms) need to simultaneously read the same keyway signal, its isolation characteristics prevent signal interference.
        • Large turbine machinery monitoring: Widely used in steam turbines, compressors, and gas turbines, providing accurate speed references and phase references for vibration analysis.
        • High-noise electromagnetic environments: In areas with numerous inverters or large motors, isolated I/O suppresses common-mode interference, ensuring the stability of pulse triggering.
        • Remote wiring optimization: Used in conjunction with external terminal blocks, suitable for situations where cabinet space is limited and sensor cables need to be centrally connected to terminal blocks.
        • Speed ​​measurement and interlocking: Real-time monitoring of rotor revolutions per minute (RPM) and providing a synchronous sampling clock for other monitoring modules within the 3500 system (such as 3500/42M).
        • Phase angle calculation: By capturing keyway markers, the phase angle of the vibration signal relative to the rotor position is calculated for dynamic balance analysis and vector trend monitoring. Sensor Status Self-Check: Equipped with OK limit monitoring function, it can automatically identify abnormal conditions such as probe disconnection, short circuit, or exceeding the linear range, and trigger an alarm.
        • Pulse Threshold Adjustment: Supports user-defined hysteresis and threshold to accommodate different types of sensing probes (proximity switches, magnetoelectric, or photoelectric).
        • External Terminal Interface (ET): Employs a dedicated multi-pin connector, connecting to an external terminal board via cable for physical access to field sensor signals.
        • Signal Isolation Transmission: Provides electrical isolation protection up to 500 Vrms, effectively cutting off ground loop current and protecting the 3500 frame backplane from field surge impacts.
        • Dual-Channel Input Support: A single module supports 2 independent key phase signal inputs, configurable for redundant mode or independent shaft monitoring at different speeds.
        • High-Speed ​​Backplane Communication: Distributes digitized pulse signals to all slots in real time through the frame backplane, ensuring system-wide sampling synchronization (phase error typically less than 1 degree).
        View as PDF
        Description
        The Bently Nevada 126648-01 Keyphasor I/O Module is part of the 3500 Series Mechanical Protection System, designed to provide precise Keyphasor signals to 3500 rack monitor modules. This half-height, two-channel module accepts input signals from proximity probes or magnetic pickups, converting them into digital Keyphasor signals that indicate shaft position relative to the Keyphasor mark. With typical power consumption of just 3.2 Watts, it ensures efficient operation within industrial environments.

        Unlike the standard 3500/25 Keyphasor module, the 126648-01 supports external terminal connections, simplifying installation and wiring management. Its input signal range accommodates +0.8 V to -21.0 V for non-isolated I/O modules and +5 V to -11 V for isolated modules, while internal limits protect the module from overvoltage conditions. Passive magnetic pickups require a minimum shaft speed of 200 rpm (3.3 Hz), ensuring reliable signal detection across varying machinery speeds.

        The Bently Nevada 126648-01 provides robust electrical characteristics, with a minimum input impedance of 21.8 kΩ and maximum buffered output impedance of 504 Ω. Keyphasor transducer power is supplied at -24 Vdc with a maximum of 40 mA per channel, ensuring stable operation. The module is engineered to operate in harsh conditions, with an operating temperature range of -30°C to +65°C (-22°F to +150°F) and storage temperatures between -40°C and +85°C (-40°F to +185°F), withstanding up to 95% non-condensing humidity.

        Installation is straightforward, requiring just one full-height rear slot in a 3500 rack. The Bently Nevada 126648-01 supports normal configurations with up to four Keyphasor signals and can be paired for up to eight Keyphasor signals, offering greater flexibility compared to older 3500/25 modules. This combination of precise signal processing, environmental resilience, and installation flexibility makes the 126648-01 an optimal choice for critical machinery protection.
        Alternative Names
        125800-01 126648-02 125800-02 135473-01 149369-01
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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.
        VIEW ALL FAQS
        How many channels does the 126648-01 support?
        It is a two-channel module, providing Keyphasor signals to monitor modules in a 3500 rack.
        Why is the 126648-01 preferred over standard 3500/25 modules?
        It offers external terminal connections, flexible Keyphasor pairing for up to eight signals, and a robust design for industrial environments.
        What input signals can the 126648-01 accept?
        Non-isolated I/O modules accept +0.8 V to -21.0 V, while isolated modules accept +5 V to -11 V, with internal limits to prevent damage.
        How does the 126648-01 handle passive magnetic pickups?
        Passive pickups require a minimum shaft speed of 200 rpm (3.3 Hz) to generate detectable signals for accurate Keyphasor conversion.

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