330703-00-100-10-11-CN Proximity Probe Bently Nevada 3300 XL Metric

Product Overview

The 330703-00-100-10-11-CN is a high-performance 11 mm metric eddy current proximity probe developed by Bently Nevada for the legacy 3300 XL series. This precision transducer translates the physical distance between its sensor tip and a rotating shaft into a highly accurate electrical signal. It is specifically engineered to handle continuous vibration monitoring and thermal expansion tracking in critical high-speed industrial turbomachinery.

Constructed with premium raw materials, the 330703-00-100-10-11-CN features a Polyphenylene Sulfide (PPS) tip and an AISI 304 stainless steel case. It utilizes a specialized FluidLoc triaxial cable to prevent moisture and oil migration through the internal sheath, maintaining signal integrity in extreme industrial lubrication environments.

Configuration Breakdown

The part number 330703-00-100-10-11-CN represents a precise combination of physical and electrical options decoded below:

• 330703 (Base Model): 3300 XL 11 mm Proximity Probe, M14 x 1.5 metric thread, unarmored cable
• └─ 00 (Unthreaded Length): 00 mm fully threaded body profile
• └─ 100 (Overall Case Length): 100 mm total rigid case length
• └─ 10 (Total Length): 1.0 meter (3.3 feet) integrated cable span
• └─ 11 (Connector & Cable Type): Miniature coaxial ClickLoc connector with integrated protector and FluidLoc fluid-blocked cable
• └─ CN (Agency Approvals): Country-specific hazardous area certification package

Technical Specifications

• Brand: Bently Nevada (Baker Hughes)
• Model Coding: 330703-00-100-10-11-CN
• Product Series: 3300 XL 11 mm Metric Proximity System
• Sensor Tip Diameter: 11 mm nominal projection face
• Thread Pitch Designation: M14 x 1.5 thread structure
• Maximum Thread Engagement: 21 mm internal depth limit
• Center-to-Outer DC Resistance (RPROBE): 5.9 ± 0.5 Ohms characteristic loop
• Cable Impedance Style: 75 Ohm fluoroethylene propylene (FEP) insulated triaxial cable
• Maximum Case Torque Limit: 63.3 N·m (560 in·lb) structural stress cap
• Recommended Operational Torque: 21.1 N·m (187 in·lb) standard seating torque
• Core Temperature Operating Limit: -52 °C to +177 °C structural range
• Pressure Seal Safeguard Warning: Continuous exposure below -34 °C can degrade the internal pressure seal
• 60 Hz Magnetic Field Susceptibility: Low noise response ranging from 0.001 mil p-p/gauss at 0.5 mm gap up to 0.027 mil p-p/gauss at 4.6 mm gap

Target Equipment & Field Application Scenarios

The 330703-00-100-10-11-CN eddy current sensor mounts into heavy industrial equipment trains. It is highly suited for monitoring radial vibration and axial thrust position in large steam or gas turbines. It tracks case expansion on high-capacity centrifugal compressors and evaluates bearing clearances in power generation synchronous generators, utility-scale water pumps, and critical industrial gearboxes.

Diagnostic Logic & Verification Metrics

Instrumentation specialists can diagnose the 330703-00-100-10-11-CN via raw DC voltage loops. By measuring the return voltage baseline at the 3300 XL Proximitor sensor output, field engineers can map the exact probe gap clearance. Testing the DC resistance across the center pin and the outer shield of the ClickLoc jack must yield a value between 5.4 and 6.4 Ohms. Any reading outside this range identifies a cracked tip, a copper wire fault, or fluid contamination in the core lead.

Logistics, Storage & Warranty Profile

• Stock Matrix Status: Factory new and original in pristine factory packing boxes
• Global Priority Shipping: Handled via express priority air loops with DHL, FedEx, and UPS
• Fulfillment Window: Guaranteed secure parcel dispatch within 24 to 48 hours
• Factory Warranty Terms: Fully covered by an authentic 12-month structural operational warranty
• Hazardous Zone Thermal Classification: EPL Ga/Gc certified under specific T-codes (T1 at 232 °C down to T5 at 40 °C ambient limits)

Global PLC Spare HUB's Insight

The 330703-00-100-10-11-CN showcases Bently Nevada's robust mechanical design. The 11 mm tip variation delivers an expanded linear range compared to standard 8 mm probes, making it essential for tracking severe shaft excursions on large mechanical drives. The inclusion of the specialized ClickLoc miniature coaxial interface with a protective boot avoids loose connections and signal dropouts. Additionally, the FluidLoc core blocks oil leaks from traveling through the cable outer jacket into your dry junction box, saving substantial maintenance hours during plant overhauls.

Frequently Asked Questions

What specific issue arises if the mounting thread torque surpasses the 63.3 N·m limit?

Excessive torque can distort or crack the 304 stainless steel case, which can stress the internal coil assembly and cause permanent calibration shifts or zero-point drift.

Why is the 1.0-meter probe cable option selected over a longer 5-meter integrated lead?

Short 1.0-meter cables are typically routed directly to an external bulkhead connector on the machine casing, which helps protect the delicate sensor cable from internal mechanical damage.

How does exposing the probe to temperatures below -34 °C impact long-term performance?

Temperatures below -34 °C cause the potting compounds and sealing rings to shrink. This can compromise the internal pressure seal and lead to oil ingress under high-pressure conditions.

Can this unarmored sensor model be installed inside a turbine casing without additional conduit?

No, because this variant lacks external armor, you must route the FEP triaxial cable through rigid or flexible internal metal conduits to shield it from flying debris and high-velocity oil mist.

How do you use the center-to-outer conductor resistance value to verify probe health?

Using a calibrated multimeter, measure the resistance between the center conductor and the outer shield. A healthy 1.0-meter probe must measure between 5.4 and 6.4 Ohms; a short or open loop indicates a bad cable.

Procurement & Selection Guidance

When ordering a replacement probe, make sure the 330703-00-100-10-11-CN unthreaded and overall case length options match your original engineering drawing. Choosing an incorrect case length can result in the probe bottoming out against the target shaft or sitting too far back outside its linear measurement range. Always verify the overall system length (typically 5-meter or 9-meter matching parameters) to ensure proper calibration with your installed 3300 XL Proximitor sensor module.

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