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        330851-02-000-070-10-00-05

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        1001 reviews ｜ Need a Specific Revision?
        The 330851-02-000-070-10-00-05 is a Bently Nevada 3300 XL 50 mm proximity probe with M14x1.5 thread, 70 mm case length, 1.0 m cable, and multiple hazardous area approvals for differential expansion measurement.
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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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        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 330851-02-000-070-10-00-05

        • Manufacturer:
          Bently Nevada
        • Part Number:
          330851-02-000-070-10-00-05
        • Product Family:
          3300 XL 25mm Proximity Transducer System
        • Product Type:
          50 mm Proximity Probe
        • Thread Type:
          M14x1.5 (metric)
        • Unthreaded Length:
          0 mm
        • Overall Case Length:
          70 mm
        • Total Length (probe cable):
          1.0 meter (3.3 feet)
        • Armor:
          None (00)
        • Agency Approvals:
          Multiple (05 – CSA, ATEX, IECEx)
        • Linear Range:
          27.9 mm (1100 mils)
        • Linear Range Start:
          1.3 mm (50 mils) from target
        • Linear Range End:
          29.2 mm (1150 mils) from target
        • Deviation from Best Fit (DSL):
          <±0.74 mm (±29 mils)
        • Probe Tip Material:
          Polyphenylene Sulfide (PPS)
        • Probe Case Material:
          AISI 304 stainless steel
        • Tensile Strength (case to lead):
          330 N (75 lbf) max
        • Weight:
          0.42 kg
        • Estimated shipping dimensions:
          117.5x5x5cm
        • Tariff Code:
          8479899990
        • 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 Performance & Efficiency Application Scenarios

        Features:

        • Ideal for differential expansion and rotor expansion measurement on large steam turbine generators
        • Suitable for harsh turbine casing environments
        • Certified for Division 1 (intrinsically safe) and Division 2 (non‑incendive) installations
        The 330851-02-000-070-10-00-05 is specifically designed for differential expansion (DE) and rotor expansion (RX) measurements on large steam turbine generators. The turbine rotor and stator (casing) expand at different rates during startup and load changes. This differential expansion can exceed the linear range of standard 8 mm or 25 mm proximity probes. The 3300 XL 50 mm probe provides a linear range of 27.9 mm (1100 mils) – the longest of any Bently Nevada eddy current transducer. The linear range extends from 1.3 mm to 29.2 mm from the target, producing an output voltage of approximately -1.5 to -12.5 Vdc. The average scale factor is 394 mV/mm (10 mV/mil).

        Steam turbine casings can reach extreme temperatures, especially near the high‑pressure section. The 330851-02-000-070-10-00-05 is built to survive these conditions. The probe can operate continuously at 200°C (392°F) and withstand intermittent temperatures up to 250°C (482°F) for less than 24 hours (e.g., during turbine startup or transient events). The probe tip is made of Polyphenylene Sulfide (PPS), a high‑temperature thermoplastic. The case is AISI 304 stainless steel. The probe has both front and rear seals, combined with a High Temperature FluidLoc cable, to prevent steam or moisture from entering the probe tip.

        The 330851-02-000-070-10-00-05 carries hazardous area approvals for use in explosive atmospheres. The “05” suffix indicates multiple approvals: ATEX (Europe), IECEx (international), and CSA (North America). The probe can be installed in Division 1 (Zone 0) intrinsically safe systems when used with zener barriers or galvanic isolators per drawing 141092. It can also be used in Division 2 (Zone 2) non‑incendive systems without barriers per drawing 140979. The temperature classification depends on the ambient temperature: T5 (-35°C to +85°C) or T4 (-51°C to +100°C). The load parameters (capacitance, inductance, L/R ratio) must not exceed specified limits for the gas group (IIC, IIB, IIA).

        The 330851-02-000-070-10-00-05 Bently Nevada Proximity Probe may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

        Bently Nevada 330851-02-000-070-10-00-05 Proximity Probe Manuals, Datasheets,Drivers,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 330851-02-000-070-10-00-05 Proximity Probe Specs

        General

        • Manufacturer GE /Bently Nevada
        • Model 330851-02-000-070-10-00-05
        • Condition New Original ready stock
        • Product Family 330851-02-000-070-10-00-00,330101-00-16-10-02-00,330851-04-000-023-10-01-05
        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.
        • Power Generation & Heavy Utilities: Safeguards large-scale power generators, industrial gas turbines, and utility-class.
        • Petrochemical & Refining: Monitors critical high-horsepower turbo-machinery, multi-stage process compressors, and large feedstock pumps.
        • Heavy Process Manufacturing: Deployed across mining hoists, large marine propulsion systems, and capital-intensive metal rolling mill machinery.
        • Extended Linear Envelope: Provides a wide 12.7 mm (500 mils) linear range with a normalized scale factor of 0.787 V/mm (20 mV/mil). This allows the sensor to record large mechanical shifting without clipping or losing signal calibration.
        • dvanced Environmental Seals: Equipped with native front and rear viton seals and FluidLoc high-temperature cable structures. These components block process steam, moisture, and hot synthetic lubricants from shorting out the probe tip.
        • Extreme Thermal Resilience: Functions continuously in operating environments ranging from -35°C to +200°C (-31°F to +392°F), and survives short-term exposure up to +250°C (+482°F).
        • Ramp & Collar Differential Expansion (DE): Installed inside steam turbines to continuously measure Differential Expansion. It tracks the physical expansion variance between the fast-heating turbine rotor and the slower-heating outer stator/casing to prevent catastrophic internal blade-rubbing.
        • Dual-Ramp Long-Stroke Measurement: Arranged in pairs looking at a physical shaft collar or tapered ramp. This setup monitors absolute axial growth during multi-day turbine start-up and shutdown cycles.
        • Large Structural Structural Shift Monitoring: Tracks slow-moving thrust bearing or housing positional displacement under extreme high-torque loads.
        Description
        The 330851-02-000-070-10-00-05 is a 3300 XL 50 mm proximity probe designed for differential expansion (DE) and rotor expansion (RX) measurements on large steam turbines. It has a linear range of 27.9 mm (1100 mils) with an average scale factor of 394 mV/mm (10 mV/mil). The probe features an M14x1.5 metric thread, 70 mm overall case length, and 1.0 meter total length. It operates continuously at 200°C (392°F) and intermittently up to 250°C (482°F). 

        When using the 330851-02-000-070-10-00-05, engineers can measure differential expansion on turbine generators with up to 27.9 mm of axial movement. The probe can be used in single or complementary input configurations (two probes on opposite sides of a collar to double the measurement range). The system is backward compatible with 7200 50 mm systems and has a 0.394 V/mm output, eliminating monitor configuration changes.

        The 330851-02-000-070-10-00-05 includes multiple agency approvals (suffix 05) for hazardous areas, including ATEX, IECEx, and CSA. It is powered by a -17.5 to -26 Vdc Proximitor sensor (12 mA max consumption). The probe tip is made of Polyphenylene Sulfide (PPS), and the case is AISI 304 stainless steel. The probe cable is 75 Ω triaxial with PFA insulation. The system length is 1.0 meter (probe only; extension cables are available). 

        For legacy Bently Nevada 7200 system upgrades, the 330851-02-000-070-10-00-05 replaces older 50 mm DE probes. All components (probe, extension cable, Proximitor sensor) must be replaced with 3300 XL components. The probe is available with optional SST armor (not selected in this configuration). 
        Alternative Names
        33085I-02-000-070-I0-00-05 33O851-02-OOO-O7O-1O-OO-O5 330851 02 000 070 10 00 05 330851-02-000-070-10-00-00 330851-04-000-023-10-01-05 330910-05-10-02-00 330101-00-16-10-02-00 126632-01
        Technical notes
        The 330851-02-000-070-10-00-05 is a Bently Nevada 3300 XL 50 mm proximity probe for differential expansion on large steam turbines. It has a 27.9 mm linear range (394 mV/mm scale factor) and operates at 200°C continuous (250°C intermittent). The M14x1.5 threaded probe has 70 mm case length, 1.0 m cable, and multiple hazardous area approvals (ATEX, IECEx, CSA).
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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 linear range of 330851-02-000-070-10-00-05?
        The probe has a linear range of 27.9 mm (1100 mils) , ideal for differential expansion on large turbines. For ranges up to 56 mm, use two probes in complementary configuration (opposite sides of the collar). The scale factor is 394 mV/mm (10 mV/mil).
        What temperature can 330851-02-000-070-10-00-05 withstand?
        The probe operates continuously at 200°C (392°F) and intermittently up to 250°C (482°F) for less than 24 hours. It has front/rear seals and High Temperature FluidLoc cable to prevent moisture ingress. This makes it suitable for steam turbine differential expansion monitoring.
        Can 330851-02-000-070-10-00-05 replace a 7200 50 mm probe?
        Yes. The 3300 XL 50 mm probe has the same 10 mV/mil output as the 7200 system, so no monitor configuration changes are needed. However, all components (probe, extension cable, Proximitor sensor) must be replaced with 3300 XL parts.
        Does 330851-02-000-070-10-00-05 work with a sliding bracket?
        Yes. Optional sliding brackets (330879) allow you to move the probe through its linear range for verification and gapping. A verification kit (131036‑01/02) with a spindle micrometer can be temporarily attached to provide reference measurements.

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