Product Overview

The Bently Nevada 330704-00-050-10-01-05 3300 XL 11 mm Proximity Probe delivers continuous, high-fidelity non-contacting displacement and vibration data for heavy-duty industrial machinery. Utilizing a large-diameter 11 mm sensing tip, this eddy current transducer features an extended linear range compared to standard 8 mm models, making it ideal for applications requiring greater clearance or observing targets with irregular surfaces.

The probe seamlessly interfaces with the Bently Nevada 3500 Machinery Protection System, Honeywell Experion DCS platforms, and safety interlock frameworks. It monitors critical mechanical variables such as radial shaft vibration, axial thrust position, and phase reference parameters on large steam turbines, high-capacity gas compressors, and industrial generators, enabling operators to execute reliable emergency shutdowns before catastrophic component failure occurs.

Part Number Selection and Structural Logic

330704 Base Sensor Architecture

The model prefix indicates a heavy-duty 3300 XL 11 mm proximity probe body running an M14 x 1.5 metric thread pattern. The hardware includes integrated stainless steel flexible armor, engineered to prevent mechanical shearing, abrasion, and hot oil breakdown inside the machine enclosure.

00 Unthreaded Barrel Segment

The 00 option establishes a fully threaded barrel layout from the rear base down to the sensing tip capsule. This allows field technicians to maximize thread engagement and achieve precise depth calibration when mounting through custom external brackets or machine casings.

050 Case Length Calibration

The 050 suffix defines a strict 50 mm overall case length. This compact, low-profile case configuration increases structural rigidity, ensuring the probe tip remains completely immune to parasitic, high-amplitude casing vibrations that can corrupt measurement integrity.

10 Integrated Telemetry Length

The 10 option code designates a calibrated 1.0-meter (3.3 feet) integrated cable assembly. This precise length ensures absolute electrical balancing within the RF circuit, avoiding phase velocity skewing when coupled with standard system extension lines.

01 Coaxial Connectivity with Connector Protector

The 01 suffix installs a miniature coaxial ClickLoc connector paired with a factory-installed connector protector. This specialized hardware assembly seals the critical electrical interface against fluid ingress and mechanical decoupling under extreme machine vibration profiles.

05 Global Safety and Hazardous Area Certifications

The 05 option integrates a multi-agency approval suite, matching ATEX, IECEx, and CSA standards for intrinsically safe installations. This option enables immediate deployment within explosive vapors and classified industrial environments.

Heavy-Duty Transducer Metrology Matrix

Mechanical Position Calibration and Field Guidance

To ensure stable dynamic tracking, technicians must precisely calibrate the mechanical gap voltage during field commissioning. Thread the M14 armored probe into the mounting location until the raw DC gap voltage monitored at the 3300 XL Proximitor sensor output reads exactly -9.00 VDC, which marks the exact midpoint of the 11 mm system's linear operating window.

Always verify this voltage threshold using a high-impedance digital multimeter before securing the locking hardware. Maintain a strict minimum bend radius of 25.4 mm (1.0 inch) along the flexible armor sleeve during routing to avoid crushing the internal coaxial dielectric core.

Isolate the sensor lines from alternating current (AC) power lines and motor drives, terminating the outer shield mesh exclusively at the 3500 monitoring rack ground bus to eliminate parasitic electromagnetic cross-talk.

Technical Supervisory Instrumentation Integration Advantages

Extended Linear Tracking Range

The 11 mm sensor geometry yields a 4.0 mm (160 mils) linear measurement zone, which doubles the response area of conventional 8 mm probes. This expanded window accommodates large axial thermal growth profiles and massive shaft movements common to utility-scale turbomachinery trains.

High-Integrity ClickLoc Protection

The integrated connector protector seals the ClickLoc connection from moisture, ambient humidity, and synthetic turbine lubricants. This extra layer maintains low contact resistance and preserves loop impedance over years of continuous operation, eliminating intermittent "Not OK" status alarms at the DCS layer.

Inventory Procurement Manifest

Every processed order package contains the following instrumentation items:

(1) New Bently Nevada 330704-00-050-10-01-05 3300 XL 11 mm Proximity Probe with flexible stainless steel armor.

(2) Factory-installed ClickLoc coaxial connector equipped with a rugged connector protector.

(3) Premium M14 hex jam locknut for high-vibration position locking.

(4) Complete factory inspection documentation detailing calibrated electrical attributes and dimensional compliance.

Supply Chain Packing and Expedited Dispatch Controls

This asset profile operates on a 2-7 days dispatch framework following complete payment finish. We route all international B2B shipments via premier express networks including DHL, FedEx, and UPS to guarantee fast transport timelines and real-time end-to-end tracking visibility.

The hardware is packed inside multi-layer, anti-static industrial packaging featuring custom vacuum-sealed enclosures and shock-absorbing foam inserts, keeping the sensitive inductive coil structures safe from static charge build-up and physical freight transit vibrations.

Field Deployment and Instrumentation Technical Insights

Q1: Why does the 11 mm probe require a -9.00 VDC gap voltage instead of the -10.00 VDC standard used for 8 mm probes?

A1: The Bently Nevada 3300 XL 11 mm system utilizes a different calibration curve and scale factor (3.94 V/mm or 100 mV/mil) to achieve its extended 4.0 mm linear range. The engineering midpoint for this specific curve is optimized at -9.00 VDC, ensuring equal headroom for both positive and negative shaft displacements.

Q2: Can this 330704 11 mm probe be connected to a standard 3300 XL 8 mm Proximitor sensor?

A2: No, this will cause extreme measurement errors. The internal inductive coil characteristics of the 11 mm probe head differ significantly from an 8 mm version. You must pair this probe with a matching 3300 XL 11 mm Proximitor sensor, otherwise the system will fail to generate the correct scale factor, rendering all vibration data invalid.

Q3: What specific protection does the connector protector provide in field environments?

A3: The connector protector physically encloses the miniature coaxial ClickLoc junction, acting as an environmental seal that prevents water, cutting fluids, and lubricating oils from penetrating the RF connection. It also dampens high-frequency mechanical vibrations that could slowly back the connector apart, preserving continuous shielding integrity.