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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power specializes in sourcing obsolete Bently Nevada monitoring hardware, supplying fully tested 18745-04 Proximitor sensors to keep your critical turbines, compressors, and rotating machinery protection systems running smoothly without requiring costly instrument overhauls.

        18745-04

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        18745-04 is primarily used to meet the required overall system length when combining the probe and extension cable, ensuring stable operation and measurement accuracy in vibration and displacement monitoring systems.
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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 18745-04

        • Manufacturer:
          Bently Nevada
        • Part Number:
          18745-04
        • Product Family:
          7200 Proximity Transducer Systems
        • Product Type:
          Proximitor Sensor
        • Stock:
          4
        • System Series:
          7200 Proximity Transducer Systems
        • Supported Probe Sizes:
          5 mm and 8 mm
        • Device Type:
          Proximitor
        • System Length Configuration:
          For combined probe and extension cable system length of 9 meters (29.6 feet)
        • Installation Requirement:
          Unthreaded length must be at least 0.8 inches (20 mm) less than case length
        • Extension Cable Length Rule:
          Physical length equals electrical length
        • Extension Cable Length Tolerance:
          ±10%
        • Weight:
          0.24 kg
        • Estimated shipping dimensions:
          8x2.8x6cm
        • Tariff Code:
          8537101190
        • 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 Applications Performance & Efficiency Monitoring & Control

        Features:

        • Strict API 670 Standard Alignment
        • Long-Distance, Low-Loss Signal Transmission
        • Exceptional Environmental Resiliency
        The Bently Nevada 18745-04 is built to satisfy the standardized 200 mV/mil (7.87 V/mm) scale factor output requirements laid out by the American Petroleum Institute. This native alignment guarantees high-level industrial conformity and reliable interoperability with major safety and machinery monitoring infrastructures worldwide.

        Equipped with high-fidelity signal driving circuitry, the Bently Nevada 18745-04 can send proximity raw data up to 1,000 feet (305 metres) over standard three-conductor shielded cable. This allows the sensor to remain deep inside the field plant while safely terminating into control rooms with zero performance degradation.

        Designed to perform continuously under demanding industrial temperatures ranging from -51°C to +100°C, the electronic housing of the Bently Nevada 18745-04 protects delicate internal components. This wide thermal envelope prevents calibration drift and ensures measurement stability despite surrounding ambient fluctuations.

        The 18745-04 Bently Nevada 7200 Series 5mm/8mm Proximitor Sensor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Bently Nevada 18745-04 7200 Series 5mm/8mm Proximitor Sensor 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 18745-04 7200 Series 5mm/8mm Proximitor Sensor

        General

        • Manufacturer GE / Bently Nevada
        • Model 18745-04
        • Condition New Original ready stock
        • Product Family 18745,18745-03,18745-04-05
        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.
        • Radial Vibration Analysis: The module is widely deployed to capture high-frequency dynamic shaft movements, enabling the early detection of severe machine faults like rotor unbalance, shaft misalignment, and localized fluid-film bearing degradation.
        • Axial Thrust Position Tracking: It tracks continuous axial displacements of critical rotating components, providing plants with immediate data to detect thrust bearing wear and prevent devastating rotor-to-stator mechanical contact.
        • Rotor Eccentricity Verification: Installed on large steam and gas turbines, the sensor accurately tracks slow-speed thermal bowing or gravity sags (rotor bow), providing vital start-up clearance diagnostics.
        • Comprehensive Machinery Coverage: It acts as a standard sensor interface across a broad spectrum of heavy plant machinery, including high-pressure centrifugal compressors, power generators, large industrial fans, and critical water pumps.
        • Wide Frequency Response: Boasting a comprehensive operational bandwidth from 0 Hz (true DC) up to 10 kHz, the device accurately captures both slow position drift and rapid, high-frequency shaft vibrations.
        • Exceptional Linearity Maintenance: Engineered for minimal signal distortion, its system linearity remains within a tight 0.8 mil (0.02 mm) boundary across its entire calibrated measurement zone, ensuring trustworthy control data.
        • Thermal Drift Mitigation: Built with built-in temperature compensation, it limits scale factor sensitivity drift to a typical -3% at +150°F (+65°C), ensuring precision even during severe ambient thermal shifts.
        • Low Power Footprint: Drawing a maximum of only 12 mA, the unit allows plants to safely stack dozens of Proximitor modules inside a single terminal enclosure without triggering heat dissipation or power supply issues.
        • Direct Voltage Conversion: It smoothly translates raw physical gap variations into a clean, easy-to-read analog voltage output at a standard scale of 200 mV/mil, simplifying signal interpretation for PLC/DCS analog input cards.
        • Advanced Waveform Diagnostics: By supplying unattenuated AC/DC signal components, it enables vibration engineers to generate complex Polar and Bodé plots necessary for advanced machinery diagnostics and phase angle analysis.
        • Extended Transmission Security: The unit possesses a rugged, low-impedance output driver that safely transmits critical sensor signals up to 1,000 feet away without requiring inline signal boosters or experiencing noise degradation.
        • Attitude Angle Identification: By facilitating steady-state radial position tracking, it assists operators in determining the shaft's precise operational attitude angle—a vital indicator used to evaluate hydrodynamic oil-wedge stability.
        Description
        18745-04 is designed for use with the 7200 Proximity Transducer Systems, supporting both 5 mm and 8 mm Proximitor configurations. This model is primarily used to meet the required overall system length when combining the probe and extension cable, ensuring stable operation and measurement accuracy in vibration and displacement monitoring systems.

        The 18745-04 Proximitor is configured for a combined probe and extension cable system length of 9 meters (29.6 feet). During installation, structural dimension requirements must be followed, including that the unthreaded length must be at least 0.8 inches (20 mm) shorter than the case length to ensure proper mechanical fit and installation.

        Regarding extension cable specifications, the system requires that the physical length of the extension cable equals the electrical length, with a tolerance of ±10%. This model is intended for use only with the 18745-03 five-meter Proximitor, ensuring that the overall electrical characteristics and signal compatibility meet the design standards.
        Alternative Names
        18745 04 1874504 18745-03 1874504 18745
        Technical notes
        The Bently Nevada 18745-04 must be matched exclusively with a 7200 Series 5mm or 8mm probe and extension cable configuration that totals exactly a 9-metre system length to maintain calibrated scale factor integrity. System calibration data for the Bently Nevada 18745-04 is baselined using a -24 Vdc power supply and a standard AISI 4140 steel target at +72°F/22°C).
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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
        What is the 7200 Proximity Transducer System?
        The 7200 Proximity Transducer System is a precision measurement solution available in 5 mm and 8 mm configurations, designed for displacement and vibration monitoring applications.
        What is the 18745-04 Proximitor used for?
        The 18745-04 Proximitor is the signal conditioning component within the 7200 system, specifically designed for combined probe and extension cable system lengths of 9 metres (29.6 feet).
        What are the installation requirements for the 18745-04 Proximitor?
        The unthreaded length must be at least 0.8 inches (20 mm) less than the case length to ensure proper thread engagement and mechanical stability.
        What are the exact power supply input margins and maximum current draw required by the Bently Nevada 18745-04?
        The Bently Nevada 18745-04 requires a negative DC power supply voltage input ranging strictly from -17.5 Vdc to -26 Vdc. At peak performance, the maximum current consumption of the Bently Nevada 18745-04 is tightly capped at 12 mA, making it highly efficient for multi-channel rack distributions.
        With which legacy Bently Nevada monitor series can the Bently Nevada 18745-04 be integrated?
        The Bently Nevada 18745-04 is fully compatible with, and natively integrates into, both the Bently Nevada 3300 and 9000 Monitoring Systems. Connection between the Bently Nevada 18745-04 and these panels is established using a standard three-conductor shielded cable that carries both power input and signal output.

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