Bently Nevada 330703-000-080-10-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330703-000-080-10-02-00 — 11 mm Eddy-Current Proximity Transducer System for API 670 Machinery Protection

The 330703-000-080-10-02-00 is a factory-matched, three-component eddy-current proximity transducer system from Bently Nevada’s 3300 XL platform. It is configured with an 11 mm probe body, 8.0 m (080) extension cable, 10-32 UNF reverse-mount thread, and a 2.0 m armored driver cable. This configuration is widely specified in API 670-compliant radial vibration and shaft position monitoring channels on critical rotating machinery across power generation, oil & gas, and petrochemical facilities.

The 3300 XL platform operates on a continuous eddy-current excitation principle: the probe coil generates a 1.0 MHz electromagnetic field. When a conductive target (typically AISI 4140 steel) enters the field, induced eddy currents alter the coil’s impedance in direct proportion to the air gap. The extension cable transmits this impedance-modulated RF signal to the oscillator-demodulator driver, which converts it to a DC voltage output spanning –1 VDC to –21 VDC at a scale factor of 7.87 V/mm (200 mV/mil). This output feeds directly into Bently Nevada 3500 or 3300 series rack monitors, or any third-party API 670-compliant proximity input card.

All three components — probe, extension cable, and driver — are calibrated as a matched set at the factory. Substituting any single component from a different calibration lot will shift the system scale factor and invalidate the measurement chain. The 080 suffix designates the 8.0 m extension cable length; this must match the physical installation distance between the probe mounting point and the driver enclosure.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe coil is wound on a ferrite core and encapsulated in a stainless-steel housing with a PEEK (polyether ether ketone) tip face. PEEK provides electrical transparency to the 1.0 MHz excitation field while delivering a Rockwell hardness sufficient to resist abrasion from incidental contact during installation. The coil geometry is optimized for an 11 mm tip diameter to balance sensitivity (V/mm) against the target area requirement — a smaller probe diameter reduces the minimum shaft diameter that can be monitored without geometric error, while the 11 mm form factor maintains adequate signal-to-noise ratio at the rated 2.0 mm linear range.

The extension cable is a precision coaxial assembly with a controlled characteristic impedance matched to the probe coil’s reactive load at 1.0 MHz. The outer braid is stainless-steel armor, providing both EMC shielding and mechanical protection against crush loads and abrasion in cable trays. The 8.0 m length (suffix 080) is electrically compensated in the driver’s oscillator circuit; using a different cable length without recalibration will shift the operating point on the impedance-versus-gap curve and introduce a static offset error.

The oscillator-demodulator driver contains a Colpitts-type oscillator whose resonant frequency is loaded by the probe-cable impedance. Gap changes detune the oscillator; the demodulator extracts the amplitude envelope and converts it to the –1 to –21 VDC DC output. The driver’s internal temperature compensation network corrects for the probe coil’s thermal coefficient of resistance (TCR) across the –35 °C to +85 °C driver operating range, maintaining scale factor accuracy to within ±0.5% over temperature. The driver housing is rated IP65 and includes a transient voltage suppressor (TVS) on the supply rail to protect against inductive spikes from adjacent relay coils — a common EMC threat in turbine control panels.

The reverse-mount thread (10-32 UNF) allows the probe to be installed from the back of the mounting bracket, with the locknut tightened against the bracket face. This geometry prevents the probe from being driven into the shaft if the locknut loosens under vibration — a critical safety feature for API 670 installations where probe contact with a rotating shaft at operating speed would cause immediate mechanical damage.

System Integration Benefits

• Direct 3500 Rack Compatibility: The –1 to –21 VDC output at 200 mV/mil matches the input specification of Bently Nevada 3500/40M and 3500/42M proximity input cards without any signal conditioning or range adjustment.
• API 670 Channel Compliance: The complete system meets API 670 5th Edition Table 1 requirements for radial vibration channels, including scale factor tolerance (±1%), frequency response, and temperature performance — eliminating the need for supplementary calibration hardware at commissioning.
• Deterministic DC Output: The DC-proportional output eliminates the phase ambiguity inherent in AC-coupled vibration signals, enabling both static position (gap) and dynamic vibration measurement on a single channel — a requirement for combined radial vibration and position monitoring per API 670 §5.3.
• High-Temperature Probe Rating: The +177 °C probe rating covers bearing pedestal temperatures on high-pressure steam turbines without thermal derating or additional insulation, reducing installation complexity in hot-section applications.
• Broad Monitor Interoperability: The standardized 200 mV/mil scale factor is recognized by third-party API 670-compliant monitors (e.g., Emerson Machinery Health Manager, GE Bently Nevada System 1) without custom scaling, preserving investment in existing monitoring infrastructure during platform migrations.
• Plug-and-Play Retrofit: Dimensional and electrical compatibility with legacy 3300 Series probes allows direct replacement in existing installations without re-drilling mounting holes, re-routing cables, or modifying monitor rack configuration files.
• Diagnostic Transparency: The driver’s DC output can be monitored with a standard multimeter to verify gap setting during installation and to diagnose probe-to-shaft clearance drift during scheduled maintenance outages — no specialized test equipment required.
• Reduced Spare Parts Complexity: A single 330703-000-080-10-02-00 assembly covers both radial vibration and axial position channel types (with appropriate mounting hardware), allowing maintenance planners to consolidate spare parts inventory across multiple machine trains.

Quality Assurance & Global Logistics

Every 330703-000-080-10-02-00 unit stocked at siemensplc.com is sourced through verified supply channels carrying full Bently Nevada OEM traceability. Incoming inspection covers part-number label authentication, connector integrity, cable continuity, and physical condition assessment. Units are stored in ESD-safe, climate-controlled conditions to preserve connector contacts and cable jacket integrity during storage.

Documentation available upon request includes: Certificate of Conformance (CoC), original Bently Nevada datasheet, and calibration certificate for new-in-box units. HS Code 9031.80 applies to this product class; export documentation including commercial invoice, packing list, and certificate of origin is prepared for all international shipments from our Xiamen, China facility.

Dispatch from Xiamen typically occurs within 1–3 business days of order confirmation. Express courier options (DHL, FedEx, UPS) provide door-to-door transit times of 3–5 business days to most destinations in Southeast Asia, Europe, the Middle East, and the Americas. Freight forwarding and consolidated shipment options are available for volume orders. All units are packed in anti-static foam-lined cartons with moisture-barrier bags for international transit.

A 12-month warranty covers manufacturing defects from the date of dispatch. Technical support for installation, gap-setting procedures, and compatibility verification is available via email and WhatsApp throughout the warranty period and beyond.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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