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        330851-01-000-020-10-00-00

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        1001 reviews ｜ Need a Specific Revision?
        The Bently Nevada 330851-01-000-020-10-00-00 is a 25 mm eddy current probe for differential expansion (DE) monitoring in large steam turbines, featuring a 12.7 mm linear range and 200°C high-temperature capability.
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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 330851-01-000-020-10-00-00

        • Manufacturer:
          Bently Nevada
        • Part Number:
          330851-01-000-020-10-00-00
        • Product Family:
          3300 XL 25mm Proximity Transducer System
        • Probe Case Type:
          1 ¼ - 12 thread
        • Unthreaded Length:
          0 mm(0.0 in)
        • Overall Case Length:
          20 mm(2.0 in)
        • Total Length:
          1.0 metre (3.3 feet)
        • Armor:
          No Armor
        • Agency Approval:
          No Approvals
        • Sensitivity:
          0.787 V/mm (20 mV/mil) nominal
        • Linear Range:
          12.7 mm (500 mils)
        • Gap Range (Linear):
          0.63 mm to 13.33 mm (25 to 525 mils)
        • Cable Type:
          75Ω triaxial, PFA-insulated FluidLoc
        • Continuous Temp (Probe):
          -40°C to +200°C (-40°F to +392°F)
        • Intermittent Temp (Probe):
          Up to 250°C (482°F)
        • Probe DC Resistance:
          6.2 ± 0.5 ohms
        • Supply Voltage:
          -17.5 Vdc to -26 Vdc
        • Frequency Response:
          0 to 2.7 kHz (-3 dB)
        • Weight:
          0.8 kg
        • Estimated shipping dimensions:
          25x15x5cm
        • 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 Operating Environment Monitoring & Control

        Features:

        • High-Temperature Survivability for Harsh Turbine Environments
        • Moisture-Proof Front and Rear Seals with FluidLoc Cable
        • Long 12.7 mm Linear Range for Differential Expansion (DE) Monitoring
        The Bently Nevada 330851-01-000-020-10-00-00 is built to endure extreme steam turbine conditions. It continuously operates and maintains accuracy at probe tip temperatures up to 200°C (392°F) and withstands intermittent spikes up to 250°C (482°F), thanks to its PEEK tip and high-temperature FluidLoc cable.

        Prevents steam and oil ingress that commonly kills standard probes. This model integrates both front and rear seals plus a specialized FluidLoc cable, ensuring the sensing tip remains uncontaminated and reliable even in condensing, high-humidity environments inside turbine casings.

        Unlike standard proximity probes, the Bently Nevada 330851-01-000-020-10-00-00 offers a full 12.7 mm (500 mils) linear range, making it specifically suitable for measuring differential expansion between the turbine rotor and casing. This range eliminates the need for multiple probe arrangements in many mid- to large-size steam turbines.

        The 330851-01-000-020-10-00-00 Bently Nevada 3300 XL 25 mm Proximity Probe may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Bently Nevada 330851-01-000-020-10-00-00 3300 XL 25 mm Proximity Probe 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 330851-01-000-020-10-00-00 3300 XL 25 mm Proximity Probe

        General

        • Manufacturer GE / Bently Nevada
        • Model 330851-01-000-020-10-00-00
        • Condition New Original ready stock
        • Product Family 330851-05-000-040-50-01-05,330851-04-000-023-10-01-05,330851-06-000-070-50-00-05
        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.
        • Differential Expansion (DE) in Steam Turbines – Measures axial growth difference between rotor and casing in mid- to large-size turbine generators, preventing blade rub and casing contact.
        • Large Compressor Shaft Displacement – Monitors axial position changes in centrifugal and axial compressors where long linear range (12.7 mm) is required.
        • Generator Rotor Thermal Growth – Tracks rotor expansion during startup and load changes, enabling safe warm-up sequences.
        • Upgrade Replacement for Legacy 7200 Systems – Direct physical and electrical replacement for old 25 mm DE integral probes, reducing downtime during retrofit projects.
        • High-Temperature Turbine Casings – Continuous operation at probe tip up to 200°C with intermittent spikes to 250°C, suitable for HP and IP turbine sections.
        • Condensing Steam Environments – FluidLoc cable and double-sealed tip prevent moisture ingress even when connectors are exposed to 100% condensing humidity (non-submerged).
        • Oil and Chemical Exposure – PEEK probe tip resists turbine oil and mild chemicals, ensuring long-term measurement stability.
        • Vibration and Mechanical Stress – AISI 304 stainless steel case withstands high vibration levels typical of turbine bearings and casings.
        • Analog Voltage Output (0.787 V/mm) – Provides direct, real-time gap voltage to Bently Nevada 3500 racks or third-party PLCs for alarm and trip logic.
        • Redundant Measurement Configuration – Supports two probes observing the same collar side for redundant DE monitoring, meeting API 670 recommendations.
        • Complementary Input Arrangement – Allows two probes on opposite sides of a collar to double the measurable DE range for very high-growth machines.
        • Periodic System Verification – Sliding bracket option (330853) enables quick in-situ verification of transducer linearity without disassembling the turbine casing.
        Description
        The Bently Nevada 330851-01-000-020-10-00-00 is a non-contact differential expansion probe engineered for the harshest environments within mid- to large-size steam turbine generators. As part of the field-proven 3300 XL series, this transducer system delivers a sensitivity of 0.787 V/mm (20 mV/mil) and a linear range of 12.7 mm (500 mils), making it ideal for measuring axial growth differences between the turbine rotor and casing.

        The Bently Nevada 330851-01-000-020-10-00-00 features a 1¼-12 thread case with 0 mm unthreaded length and a 20 mm overall case length, ensuring precise mechanical positioning. The probe incorporates advanced FluidLoc cable technology and front/rear seals to prevent moisture ingress, allowing continuous operation at temperatures up to 200°C (392°F) and intermittent exposure to 250°C (482°F). Every unit is backward-compatible with legacy 7200 series systems, enabling seamless upgrades without changing monitor configurations.

        With gold-plated ClickLoc connectors, AISI 304 stainless steel housing, and PEEK probe tip, the The Bently Nevada 330851-01-000-020-10-00-00 provides exceptional durability against steam, oil, and vibration. It complies with hazardous area approvals (ATEX, IECEx, cNRTLus) and is available in both metric and English thread variants for global installation flexibility.
        Alternative Names
        33085101000020100000 33O851-O1-OOO-O2O-1O-OO-OO 33085I-0I-000-020-I0-00-00 330851-01-000-020-10-00-05 330851-01-000-020-10-00-CN 330851-01-000-020-10-00-RU 330851-01-000-020-10-00-BR 330851-05-000-040-50-01-05
        Technical notes
        When integrating the Bently Nevada 330851-01-000-020-10-00-00 into your monitoring system, ensure the total system length (probe + extension cable) matches the Proximitor Sensor's specified length. The probe operates with a -17.5 Vdc to -26 Vdc power supply and requires a target material of AISI 4140 steel for factory-calibrated accuracy. Do not exceed the maximum rated tensile strength of 330 N (75 lbs) at the probe case-to-lead connection. For installations requiring intrinsic safety, refer to Bently Nevada drawing 141092 for zener barrier configurations. Always verify the probe gap during installation using a dial indicator kit to maintain linear range performance between 0.63 mm and 13.33 mm.
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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
        Does the Bently Nevada 330851-01-000-020-10-00-00 require any specific firmware or software to operate?
        No. This is an analog eddy current probe. It does not require firmware. It outputs a -1.5 to -11.5 Vdc signal directly to any compatible monitor (e.g., Bently Nevada 3500, 1900 series) without software configuration.
        Can the Bently Nevada 330851-01-000-020-10-00-00 be integrated with third-party PLC or DCS systems?
        Yes. The 0.787 V/mm (20 mV/mil) output is industry-standard analog voltage. You can connect it to any analog input module (0 to -20 Vdc range) after proper signal conditioning.
        How do I gap the Bently Nevada 330851-01-000-020-10-00-00 correctly?
        Set the initial gap to 7.0 mm (275 mils) for the midpoint of the linear range. Use a 3300 XL Sliding Bracket (330853) and a dial indicator verification kit (163854) to move the probe through its full 12.7 mm range.
        Is the Bently Nevada 330851-01-000-020-10-00-00 approved for hazardous areas?
        Yes, but only when installed with intrinsic safety barriers per Bently Nevada drawing 141092 or galvanic isolators. Without barriers, it is general-purpose (No Approvals option 00).

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