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        Bently Nevada 138708-01
        Bently Nevada 138708-01
        Bently Nevada 138708-01
        Bently Nevada 138708-01
        Bently Nevada 138708-01
        Bently Nevada 138708-01
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        138708-01

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        Bently Nevada 138708-01 Shaft Absolute I/O Module delivers precise vibration and position monitoring with short-circuit protected buffered outputs for reliable industrial machinery protection.
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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.
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        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
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        Technical specifications for 138708-01

        • Manufacturer:
          Bently Nevada
        • Part Number:
          138708-01
        • Product Family:
          3500 System
        • U (V):
          23.9 / 6.82
        • I (mA):
          45.5
        • P (W):
          1.09 / 0.31
        • Resolution:
          0.3662 µA per bit ±0.25% error at room temperature ±0.7% error over temperature range; Update rate approximately 100 ms or less.
        • Shaft Absolute Buffered Outputs:
          The Shaft Absolute I/O modules have one output for each channel group. Each output is short circuit protected.
        • Shaft Absolute Output Impedance:
          300 Ω
        • Weight:
          0.4 kg
        • Estimated shipping dimensions:
          2.5x11.2x24.2cm
        • Tariff Code:
          8407320000
        • 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 Certifications Compatibility

        Features:

        • Provides High-Resolution Shaft Absolute Position Monitoring With ±0.25% Accuracy At Room Temperature
        • Features Buffered Outputs With Short-Circuit Protection And 300 Ω Impedance For Reliable Signal Transmission
        • Maintains ±0.7% Measurement Error Across Full Temperature Range With Low Power Consumption
        The Bently Nevada 138708-01 Shaft Absolute I/O Module delivers precise machine condition monitoring by converting signals from proximity and seismic transducers into reliable shaft position and vibration data. Compared with the 3500/42M standard module, 138708-01 includes internal terminations, simplifying installation and reducing potential wiring errors, while providing buffered outputs for enhanced signal integrity.

        With 23.9 / 6.82 V voltage input, 45.5 mA current, and 1.09 / 0.31 W power consumption, the module ensures efficient operation. Its output resolution of 0.3662 µA per bit allows fine measurement, outperforming older 3500/22M I/O modules, which offer lower precision and less temperature stability.

        Integrated with the 3500/42M Proximitor Seismic Monitor, the 138708-01 supports comprehensive monitoring, including radial vibration, acceleration, eccentricity, thrust position, REBAM, circular acceptance region, differential expansion, shaft absolute, and velocity. This module not only improves measurement accuracy but also enhances signal consistency, making it ideal for demanding industrial environments where uptime and reliability are critical.

        The 138708-01 Bently Nevada Shaft Absolute 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 138708-01 Shaft Absolute 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 138708-01 Shaft Absolute I/O Module Specs

        General

        • Manufacturer GE / Bently Nevada
        • Model 138708-01
        • Condition New Original ready stock
        • Product Family 3500/42M,135489-01,135137-01
        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.
        • Heavy industrial rotating equipment: such as steam turbines, gas turbines, compressors, and generators.
        • Shaft absolute position monitoring: Measures the absolute position of a shaft relative to a fixed reference point to prevent collisions or excessive wear between the shaft and stationary parts.
        • Safety protection system: Works with the 3500 series monitors to trigger protection logic based on user-defined alarm points (Alert/Danger).
        • CE Certification: Complies with EU directives on electromagnetic compatibility (EMC) and safety.
        • Explosion-proof certification: ATEX/IECEx: Suitable for Zone 1 or Zone 2 hazardous areas. cNRTLus: Suitable for Class 1, Division 2 environments.
        • Shock resistance: Meets industrial-grade shock and vibration resistance standards.
        • Functional safety: Some versions are SIL (Safety Integrity Level) certified for high-reliability protection circuits.
        • Core Module Compatibility: Must be used with the mainboard of the 3500/42M Proximitor/Seismic monitor or the 3500/44M air-cooled gas turbine monitor.
        • Frame Compatibility: Mounts on the back of the 3500/05 standard frame and connects to the main module via a backplate.
        • Sensor Compatibility: Supports a variety of sensor inputs, including the 3300 XL 8mm eddy current sensor and other absolute shaft position encoders.
        • Software Integration: Parameters are configured via the 3500 Rack Configuration Software, and data can be transferred to the System 1™ condition monitoring software for in-depth analysis.
        View as PDF
        Description
        The Bently Nevada 138708-01 Shaft Absolute I/O Module is engineered to provide high-precision monitoring for rotating machinery, integrating seamlessly with the 3500/42M Proximitor Seismic Monitor. Unlike the standard 3500/42M, the 138708-01 offers internal terminations for cleaner wiring and faster installation, reducing field complexity while maintaining robust performance.

        With voltage inputs of 23.9 / 6.82 V and a current of 45.5 mA, the module operates efficiently at low power (1.09 / 0.31 W). Its output resolution of 0.3662 µA per bit ±0.25% error at room temperature ensures superior measurement fidelity, outperforming similar modules like the 3500/22M, which has lower resolution and higher drift over temperature. Across the full temperature range, 138708-01 maintains ±0.7% error, supporting reliable operation in harsh industrial environments.

        The Shaft Absolute Buffered Outputs are short-circuit protected and feature 300 Ω output impedance, providing enhanced signal integrity for critical machine data. Compared to the 3500/42M alone, which primarily monitors vibration and position, the 138708-01 extends capabilities with internal terminations and direct buffered outputs, minimizing wiring errors and improving signal consistency.

        Integrated with the 3500/42M Proximitor Seismic Monitor, the 138708-01 module facilitates continuous protection of machinery by comparing monitored parameters against configurable alarm setpoints. Users can program channels to report radial vibration, REBAM, acceleration, eccentricity, differential expansion, circular acceptance region, thrust position, shaft absolute, and velocity. This module enables precise, real-time communication of essential machine information to operations and maintenance personnel, surpassing the basic 3500/42M configuration in both signal clarity and installation convenience.

        For facilities upgrading from the 3500/22M or deploying new 3500/42M systems, the 138708-01 module offers a significant improvement in accuracy, output buffering, and temperature stability, ensuring consistent and reliable machinery monitoring in complex industrial setups.
        Alternative Names
        138708-02 176449-02 128229-01 140734-02 135473-01 135813-01
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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 accurate is the module across temperature ranges?
        The 138708-01 maintains ±0.7% error over the full temperature range, ensuring stable and reliable readings under varying environmental conditions.
        How can I program the module with the 3500/42M system?
        Channels can be configured via the 3500 Rack Configuration Software to monitor radial vibration, REBAM, acceleration, eccentricity, differential expansion, circular acceptance region, thrust position, shaft absolute, and velocity.
        What maintenance is required for the 138708-01 module?
        Minimal maintenance is needed; periodic inspection of wiring connections and ensuring the module remains within voltage and temperature ratings is sufficient.
        How does it improve over the 3500/22M module?
        It provides higher resolution, buffered outputs, and short-circuit protection, whereas the 3500/22M has lower resolution and lacks internal output buffering.

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