Bently Nevada 330104-00-11-10-02-05 Proximity Probe – 3300 XL Series

330104-00-11-10-02-05: Eddy-Current Displacement Sensing in API 670 Machinery Protection Loops

The Bently Nevada 330104-00-11-10-02-05 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System — a three-component measurement chain (probe, extension cable, proximitor driver) that has served as the de facto hardware standard for API 670 machinery protection on rotating equipment for more than three decades. This specific configuration encodes a 1.0 m armored integral cable (suffix -05 denotes continuous stainless-steel braid armor over the coaxial core), M10 × 1.0 threaded body machined from 316 stainless steel, and a factory-verified scale factor of 7.87 V/mm (200 mV/mil). The probe is impedance-matched at the factory to the 330180 NSv proximitor and a 330130 extension cable; the total system cable length must resolve to either 5 m or 9 m to satisfy the proximitor’s internal compensation network. Field substitution of any single element without re-verification against the original calibration curve introduces a systematic scale factor deviation that cannot be corrected at the monitor level without recalibration.

In continuous-process environments — hydrocarbon compressor trains, steam turbines driving generators, boiler feed pumps, or integrally geared expanders — shaft radial position data from this probe feeds directly into the protection relay logic of a Bently Nevada 3500 rack. The 330104 series resolves displacement across a DC-to-10,000 Hz bandwidth (–3 dB), capturing slow-roll runout at startup, synchronous 1× vibration during normal operation, and subsynchronous instability events that precede fluid-film bearing failure. A gap excursion of 25 µm at 3,600 RPM is fully resolved within the probe’s linear measurement range of 0.25 mm to 2.25 mm (10 mil to 90 mil), with an output swing of –2 VDC to –18 VDC proportional to gap across that window.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-11-10-02-05 operates on the principle of variable-impedance eddy-current induction. The 330180 proximitor drives the probe coil at a carrier frequency in the 500 kHz–2 MHz range, generating an alternating magnetic field at the 8 mm tip. When a conductive target enters this field, eddy currents induced on the target surface produce a counter-magnetic field that loads the probe coil — reducing its effective inductance and quality factor (Q). The proximitor demodulates this impedance change into a DC voltage output linearly proportional to the probe-to-target gap, with the 7.87 V/mm scale factor maintained across the full 0.25–2.25 mm linear window.

Armored Cable EMC Architecture (Suffix -05): The continuous stainless-steel braid shield runs from the probe body to the extension cable junction and is grounded at the proximitor chassis, forming a Faraday enclosure around the coaxial signal conductor. In installations where variable-frequency drives (VFDs) operate auxiliary equipment within 1–2 m of probe cable runs, capacitively coupled high-frequency noise is attenuated by the shield — typically exceeding 40 dB rejection above 100 kHz. This is the primary engineering rationale for specifying the -05 armored variant in compressor trains with VFD-driven lube oil pumps or seal gas boosters routed in the same cable tray.

Thermal Dimensional Stability: The probe coil is wound on a ceramic bobbin with a low coefficient of thermal expansion, housed within a 316 SS body that maintains dimensional integrity across the rated –35 °C to +177 °C range. The PTFE dielectric in the integral cable preserves stable capacitance per unit length across this temperature span — a critical parameter because the 330180 proximitor’s internal compensation network assumes a fixed cable capacitance. Non-OEM cables with differing dielectric constants introduce a systematic scale factor error that is not self-correcting and requires full system recalibration to resolve.

Impedance Matching and Total Cable Length Constraint: The suffix string -10-02 encodes a 1.0 m integral cable paired with a 1.0 m extension interface. The total system cable length (integral + extension) must equal 5 m or 9 m to match the proximitor’s compensation network. A mismatch of even 0.5 m can produce a scale factor deviation exceeding ±5%, which falls outside the ±1% accuracy specification mandated by API 670 for protection-grade applications. Verify the total system length against the installation drawing before procurement.

System Integration Benefits

• Direct 3500 Rack Interface Without Signal Conditioning: The –2 to –18 VDC output connects directly to Bently Nevada 3500/42M Proximitor I/O modules. No intermediate transmitter, isolator, or signal converter is required, removing one additional failure point from the measurement chain and simplifying loop documentation.
• Zero Phase Lag at the Sensing Element: The DC-to-10 kHz bandwidth means the probe output tracks shaft displacement in real time. Protection relay response time is governed solely by the 3500 monitor’s voting and delay logic — not by any bandwidth limitation at the probe level — preserving the deterministic response characteristic required for overspeed and high-vibration trip functions.
• Simultaneous Protection and Condition Monitoring Output: The buffered output at the 330180 proximitor provides concurrent feeds to the 3500 protection rack and a condition monitoring platform (Bently Nevada System 1, OSIsoft PI, or third-party DCS historian) without signal splitting hardware. A single probe installation serves both protection and predictive maintenance data streams.
• Non-Contact Measurement Eliminates Wear Mechanisms: Zero mechanical contact with the rotating shaft removes probe wear as a failure mode, eliminates shaft surface preparation requirements beyond standard finish (Ra ≤ 0.8 µm), and prevents probe-induced shaft scoring during a rub event — a failure mode that has caused secondary damage in contact-type sensor installations.
• ATEX/IECEx Zone 1 Deployment Without Additional Barriers: When paired with the approved 330180 proximitor configuration, the 330104-00-11-10-02-05 may be installed in Zone 1 and Zone 2 classified areas without supplementary intrinsic safety barriers. This reduces the Ex documentation package and eliminates the barrier as a maintenance item in the safety instrumented system (SIS) proof-test schedule.
• Gap Voltage as a Continuous Diagnostic Channel: The raw DC gap voltage, accessible at the proximitor’s buffered output, provides a continuous diagnostic signal independent of vibration amplitude. Trending this value over time reveals probe fouling from process deposit buildup (gap reduction), shaft journal wear (gap increase), or mounting bracket thermal creep — all detectable before they degrade vibration measurement accuracy or trigger nuisance alarms.
• API 670 Commissioning Documentation Satisfied by OEM Calibration Certificate: The factory calibration certificate covers the probe-cable-proximitor set as a matched unit, directly satisfying the API 670 Annex A calibration documentation requirement. Field calibration verification against an external reference standard is not required at commissioning, reducing pre-startup schedule risk.
• Like-for-Like Replacement Without Monitor Reconfiguration: All 330104-xx-xx-xx-xx-xx variants share the M10 × 1.0 thread, 8 mm tip geometry, and 7.87 V/mm scale factor. A replacement unit with an identical suffix string installs into the existing mounting without adjustment to protection setpoints, alarm thresholds, or monitor configuration — minimizing planned maintenance window duration.

Quality Assurance & Global Logistics

Each 330104-00-11-10-02-05 unit supplied through siemensplc.com is sourced from verified industrial distribution channels with full OEM traceability to Bently Nevada (Baker Hughes). Incoming units undergo inspection against published dimensional and marking standards: probe tip geometry, cable jacket and armor condition, MIL-spec connector pin integrity, and label date-code format consistent with Bently Nevada’s production marking conventions. Units that do not pass visual and dimensional inspection are quarantined and withheld from sale inventory.

Order documentation includes the original Bently Nevada part label, a certificate of conformance (CoC) referencing the OEM part number and serial or date code, and the applicable product datasheet. For ATEX-regulated installations requiring the Ex certificate, this document is provided at the time of order confirmation upon request — no additional lead time is required for standard Ex documentation.

All shipments originate from Xiamen, China — a designated national-level port city with direct air freight connections to industrial procurement hubs across Southeast Asia, the Middle East, Europe, and the Americas. Export documentation (commercial invoice, packing list, certificate of origin) is prepared in compliance with Xiamen Customs requirements. HS code classification is applied at the line-item level to support accurate duty calculation at the destination port. Primary carriers for time-sensitive orders are DHL Express and FedEx International Priority; sea freight consolidation is available for bulk procurement. Indicative air freight transit times: Southeast Asia 2–4 business days, Europe 5–7 business days, North America 5–8 business days (door-to-door). A 12-month warranty from the date of shipment covers defects in materials and workmanship, processed under a replacement-first policy with no restocking fees on warranty returns.

Contact Information

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WhatsApp: +86 18359268345
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Location: Xiamen, China
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