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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supplies top-grade Bently Nevada 330878-51-05 replacement hardware, offering industrial facilities a trusted source for critical automation components to maintain continuous and efficient plant operations.

        330878-51-05

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        1001 reviews ｜ Need a Specific Revision?
        The 330878-51-05 is an important component of the 3300 XL 50 mm sensor system, and can be used with a standalone 50 mm probe and extension cable to provide comprehensive measurement capabilities.
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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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        Technical specifications for 330878-51-05

        • Manufacturer:
          Bently Nevada
        • Part Number:
          330878-51-05
        • Product Family:
          3300 XL 50mm Proximity Transducer System
        • Product Type:
          Proximitor Sensor
        • Stock:
          1
        • Total Length:
          5.0 meters (16.4 feet) system length
        • Mounting Option:
          DIN mount
        • Agency Approval:
          Multiple Approvals
        • Proximitor Sensor Material:
          A380 aluminum
        • Compliance / Certification:
          European CE Mark approval
        • Wiring Interface:
          SpringLoc terminal strips
        • Weight:
          0.2 kg
        • Estimated shipping dimensions:
          7.8x6x6.2cm
        • Tariff Code:
          9031809090
        • 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 Compatibility Interoperability and Installation

        Features:

        • Interface Between the 50 mm Probe and 3500 Rack Monitoring System
        • Combines Capability of Signal Conditioning with Extended Linear Range Measurement
        • Operates in Conjunction with the 3300 XL 50 mm Probe and Extension Cable
        The 330878-51-05 operates as the 3300 XL 50 mm Proximitor Sensor in a transducer system, providing reliable signal conditioning for large steam turbine generator applications. It continuously processes eddy current signals from the 50 mm probe across a total system length of 5.0 meters (16.4 feet) and converts these signals to proportional voltage outputs for distribution to monitoring systems. Seamless integration is standard with the 330878-51-05, however using complementary transducer configurations will allow extended differential expansion measurement ranges up to 56 mm (2.2 inches) in the event of large rotor axial movement. The 330878-51-05 has made improvements in several areas over previous proximitor designs in addition to incorporating advanced RFI/EMI immunity within the 3300 XL product line.

        The 330878-51-05 provides essential signal conditioning functions common to the entire transducer system, and is a critical component of the measurement path, directly affecting the proper, normal operation of differential expansion monitoring. One 330878-51-05 proximitor sensor is required per transducer channel depending on the measurement configuration. The 330878-51-05 occupies minimal installation space with its thin design and can be mounted in either high-density DIN-rail installations or traditional panel mount configurations.

        For Dual Redundant Measurement applications, the 3300 XL 50 mm System requires a second 330878-51-05-based transducer channel observing the same side of the differential expansion collar. In addition to standard single transducer operation, the redundant configuration also performs complementary measurement. The 330878-51-05 dual transducer configuration executes differential expansion monitoring using the extended linear range specified in the system specifications. Using this method, the redundant measurement system continually monitors the rotor position relative to the stator. If the system detects that the differential expansion exceeds the single transducer range of 27.9 mm (1.1 inches), it will automatically utilize the complementary transducer arrangement and provide expanded measurement capability for the turbine protection system.

        The 330878-51-05 Bently Nevada 3300 XL 50 mm Proximitor Sensor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Bently Nevada 330878-51-05 3300 XL 50 mm 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 330878-51-05 3300 XL 50 mm Proximitor Sensor Specs

        General

        • Manufacturer Bently Nevada
        • Model 330878-51-05
        • Condition New Original ready stock
        • Product Family 330878-50-00,330878-51-00,330878-90-05
        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.
        • Turbine Supervisory Instrumentation (TSI): It provides critical data for the safe startup and shutdown of large turbines by measuring the relative growth between the rotor and stator.
        • Harsh Environments: Specifically engineered for aggressive steam environments, it maintains accuracy in continuous temperatures up to 200°C (392°F).
        • Extended Range Needs: It offers the longest linear range in the Bently Nevada family, capable of measuring up to 27.9 mm (1.1 inches) of displacement.
        • Legacy Systems: It is a robust replacement for older 7200 series 50 mm and 130713 DE transducer systems.
        • Hardware Interface: The Proximitor sensor's output (0.394 V/mm or 10 mV/mil) is identical to these older systems, allowing for upgrades without changing the monitor configuration.
        • Monitoring Units: It seamlessly integrates with modern monitoring platforms like the Bently Nevada 3500 Series.
        • Mounting Footprint: It shares the same 4-hole mounting "footprint" as previous designs, simplifying panel-mount replacements.
        • Component Matching: For accurate system performance, the Proximitor sensor must be used with a 3300 XL 50 mm probe and extension cable; it is not interchangeable with 8 mm or 25 mm XL components.
        • Wiring: Features SpringLoc terminal strips that require no special tools and resist loosening from vibration.
        • RFI/EMI Immunity: Enhanced immunity allows for installation in fiberglass housings or near high-frequency radio signals without special shielded conduits.
        Description
        The 330878-51-05 is a 3300 XL 50 mm Proximitor Sensor specifically designed for large steam turbine generator applications. This 330878-51-05 sensor features a total system length of 5.0 meters (16.4 feet) and utilizes DIN mounting configuration with multiple agency approvals. The 330878-51-05 forms an integral part of the 3300 XL 50 mm Transducer System, working in conjunction with a separate 50 mm probe and extension cable to deliver comprehensive measurement capabilities.

        This 330878-51-05 Proximitor Sensor is engineered with a large diameter coil that provides a maximum linear range of 27.9 mm (1100 mils), representing the longest linear range available in the eddy current transducer product line. The 330878-51-05 is specifically designed for measuring differential expansion (DE) and rotor expansion (RX) in large steam turbine generators, addressing the critical challenge of monitoring growth rate differences between the turbine rotor and machine stator casing. The 330878-51-05 enables precise tracking of thermal expansion differentials that occur during turbine startup, shutdown, and steady-state operations.

        The 330878-51-05 supports various differential expansion measurement configurations to accommodate different turbine specifications. When utilizing the 330878-51-05 for DE measurement, the system employs two proximity transducers observing a collar or ramp positioned at a distance from the thrust bearing. The 330878-51-05 accommodates installations where two transducers observe the same side of a collar for redundant measurements, or complementary input configurations where transducers observe opposite sides to effectively double the measurable DE range. For applications requiring measurement ranges between 28 mm to 56 mm (1.1 to 2.2 inches), the 330878-51-05-based system supports complementary mounting arrangements on opposite sides of the differential expansion collar.

        The 330878-51-05 incorporates advanced design features consistent with the 3300 XL Proximitor Sensor series. The 330878-51-05 features a thin profile enabling installation in high-density DIN-rail configurations or traditional panel mount setups. The 330878-51-05 delivers improved RFI/EMI immunity, achieving European CE mark approvals without requiring special mounting considerations. This electromagnetic interference protection ensures the 330878-51-05 maintains measurement integrity even when exposed to nearby high-frequency radio signals. The 330878-51-05 utilizes SpringLoc terminal strips that eliminate the need for specialized installation tools while facilitating rapid, robust field wiring connections.
        Alternative Names
        330878-51-00 330878-51-CN 330878-50-05 330878-91-05 330878-91-00 3308785105 33O878-51-O5 330878-5I-05
        Technical notes
        The Bently-Nevada 330878-51-05 requires a power supply input between -17.5 Vdc and -26 Vdc (or -23 Vdc to -26 Vdc with barriers) and must be paired exclusively with matched 5.0-meter 3300 XL 50 mm system components to preserve its factory-calibrated Scale Factor of 394 mV/mm (10 mV/mil). Operation at voltages more positive than -23.5 Vdc without barriers can result in a restricted linear range, making proper loop voltage verification critical during commissioning.
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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 makes the 330878-51-05 unique in terms of measurement capability?
        The 330878-51-05 features a large diameter coil that delivers a maximum linear range of 27.9 mm (1100 mils), which is the longest linear range available within the eddy current transducer product line.
        What is the primary application of the 330878-51-05?
        The sensor is primarily used for measuring differential expansion (DE) and rotor expansion (RX) in large steam turbine generators, enabling accurate monitoring of thermal growth during various operating conditions.
        Why is monitoring differential expansion important in turbines?
        Monitoring differential expansion is critical because it tracks the difference in expansion rates between the turbine rotor and the stator casing. This helps prevent mechanical contact between rotating and stationary parts, reducing the risk of severe equipment damage.
        What system length and component pairing parameters must be verified when integrating the Bently-Nevada 330878-51-05 into an existing vibration rack?
        The Bently-Nevada 330878-51-05 is explicitly configured for a total system length of 5.0 meters, requiring it to be paired exclusively with a matched 5-meter 3300 XL 50 mm proximity probe and specified extension cabling to maintain system calibration integrity. Mixing components of disparate lengths alters total circuit capacitance, distorts the nominal 394 mV/mm Scale Factor, and invalidates API 670 compliance.
        What are the electrical output characteristics and impedance values associated with the Bently-Nevada 330878-51-05?
        The Bently-Nevada 330878-51-05 provides a negative-going analog voltage output proportional to the probe-to-target gap, featuring an output resistance of 50 Ω. This low output impedance allows long signal transmission runs to monitoring racks without significant signal attenuation or susceptibility to background electrical noise.
        What wire gauge and connection protocols are supported by the terminal blocks of the Bently-Nevada 330878-51-05?
        The Bently-Nevada 330878-51-05 utilizes SpringLoc terminal strips designed for bare or ferruled stranded wires ranging from 0.2 to 1.5 mm² (16 to 24 AWG). The spring-clamp mechanism requires no special torquing tools, maintaining constant clamping force against thermal expansion and high-vibration industrial conditions.

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