Bently Nevada 330907-05-30-70-02-00 Proximity Probe – 3300 NSv Series

Bently Nevada 330907-05-30-70-02-00 — Reverse Mount Proximity Probe in the 3300 NSv Measurement Chain

The 330907-05-30-70-02-00 is a 5 mm eddy-current proximity probe manufactured by Bently Nevada under the 3300 NSv (Non-contacting Vibration) platform. Its reverse-mount mechanical configuration addresses a specific installation constraint: bearing housings where front-face access is obstructed by adjacent components, piping, or structural steel. The probe threads into the housing from the non-drive end, preserving the integrity of the bearing bore and eliminating the need for additional machining on the drive-side face.

Within a continuous rotating-machinery protection loop, this probe serves as the primary transducer responsible for converting shaft displacement into a proportional DC voltage signal. The output feeds directly into a Bently Nevada 3500 Series monitor card — typically the 3500/40M or 3500/42M Proximitor® Monitor — where the signal is conditioned, gap-voltage verified, and compared against alarm and danger setpoints defined per API 670 Fifth Edition. The probe does not perform signal processing internally; its role is purely electromechanical transduction with the highest possible linearity and thermal stability across the operating envelope.

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Technical Parameters

Hardware Logical Analysis

The 3300 NSv probe operates on the Lenz’s law eddy-current principle. A high-frequency oscillator within the paired Proximitor® driver (not the probe itself) drives an LC tank circuit whose inductive element is the probe coil. When a conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, loading the tank circuit and reducing its Q-factor. This loading is proportional to the gap distance between probe tip and target surface, producing a monotonically decreasing DC output voltage as the gap closes — nominally –24 VDC at maximum gap, transitioning toward 0 VDC as the shaft approaches the probe face.

Reverse-Mount Body Design: The probe body is threaded in reverse orientation relative to standard 3300 probes. The locking nut and jam nut arrangement is accessible from the back of the housing, allowing gap adjustment without disturbing the front bearing retainer. This is mechanically significant in turbine applications where the front face of the bearing housing is sealed against steam or process gas ingress.

EMC Architecture: The coaxial cable construction provides continuous 360° shielding from probe tip to Proximitor® input. The shield is grounded at the driver end only (single-point grounding), preventing ground-loop currents that would appear as low-frequency noise on the output signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear rooms — this shielding architecture maintains signal integrity without additional filtering hardware.

Thermal Compensation: The probe coil is wound with a controlled-coefficient wire and encapsulated in a thermally stable compound. The Proximitor® driver’s internal compensation circuit corrects for coil resistance drift across the –35°C to +177°C probe tip range, maintaining sensitivity within ±0.5% of nominal 7.87 V/mm across the full thermal envelope. This is critical for hot-section gas turbine applications where probe tip temperatures can exceed 150°C during steady-state operation.

5 mm Tip Geometry: The reduced tip diameter (versus the standard 8 mm 3300 XL probe) decreases the effective sensing field diameter, which narrows the linear range slightly but enables installation in compact bearing housings with bore diameters below 40 mm. The trade-off is intentional: the 5 mm tip is specified for applications where physical clearance is the binding constraint, not measurement range.

System Integration Benefits

• Direct 3500 Monitor Compatibility: The 330907-05-30-70-02-00 is factory-calibrated to the Bently Nevada 3500 Series input specification. No re-ranging, scaling, or custom calibration is required at commissioning. The monitor card reads the probe’s –24 VDC supply and 200 mV/mil sensitivity natively, reducing setup time to gap verification only.
• API 670 Full Measurement Chain Compliance: When paired with the correct extension cable (330130-xx-xx series) and a 3500/40M or 3500/42M monitor, the complete measurement loop meets API 670 Fifth Edition requirements for radial vibration and position measurement on critical rotating machinery. This simplifies documentation for machinery protection system (MPS) audits.
• Deterministic Real-Time Response: The eddy-current transduction mechanism has no moving parts and no mechanical resonance within the measurement bandwidth. The DC-to-10,000 Hz flat response ensures that all shaft dynamic events — including sub-synchronous instability, blade-pass frequencies, and rub events — are captured without phase distortion or amplitude roll-off within the monitor’s processing window.
• Diagnostic Transparency via Gap Voltage: The probe’s DC gap voltage (nominally –10.0 VDC at the center of the linear range) is continuously monitored by the 3500 system. A shift in gap voltage outside the –2 VDC to –18 VDC window triggers a Not OK (NOK) condition, providing immediate indication of probe damage, cable fault, or shaft position change — without requiring a separate diagnostic instrument.
• Hazardous Area Deployment: ATEX and IECEx certifications allow installation in Zone 1 and Zone 2 classified areas (gas groups IIA, IIB, IIC depending on variant). This covers the majority of petrochemical, refinery, and offshore platform applications without requiring additional intrinsic safety barriers in the signal loop.
• Backward Compatibility with 3300 XL Infrastructure: The 3300 NSv uses the same –24 VDC supply rail and 200 mV/mil sensitivity as the legacy 3300 XL platform. Existing cable trays, junction boxes, and monitor cards can be reused during a probe upgrade, reducing retrofit capital expenditure.
• Minimal Maintenance Footprint: The probe has no consumable components. The thermally compensated coil and sealed cable jacket are designed for continuous operation over multi-year maintenance intervals. Periodic verification consists solely of gap voltage measurement at the Proximitor® output — a 30-second procedure executable without machinery shutdown.
• DCS/PLC Integration via 3500 I/O Modules: The 3500/92 or 3500/94 I/O module provides 4–20 mA or ±10 VDC analog outputs and Modbus/PROFIBUS digital outputs to plant DCS or PLC systems. The probe’s measurement data is therefore available in the plant historian and control system without additional signal conditioning hardware, supporting condition-based maintenance (CBM) programs.

Quality Assurance & Global Logistics

Every 330907-05-30-70-02-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels and undergoes a structured incoming inspection protocol before dispatch:

• Physical inspection of probe tip geometry, cable jacket continuity, and connector pin condition
• OEM label verification: part number, date code, and serial number cross-referenced against Bently Nevada product catalog
• Factory-sealed packaging confirmation — units showing evidence of prior installation are quarantined and not offered for sale
• Certificate of Conformance (CoC) and test documentation available upon request for SIS and API 670 compliance files

Dispatch is from our Xiamen, China warehouse. Standard export packaging uses anti-static foam inserts and moisture-barrier bags to protect the probe coil and cable assembly during transit. Shipping options include:

• Express Air (DHL / FedEx / UPS): 3–5 business days to most destinations in Europe, North America, Southeast Asia, and the Middle East
• Economy Air Freight: 7–12 business days for cost-sensitive orders
• Sea Freight / Consolidation: Available for multi-unit orders; lead time quoted per destination port
• In-stock units: Same-day or next-business-day dispatch upon payment confirmation
• Ex-stock / sourced units: Quotation and lead time provided within 24 hours of inquiry

All shipments include commercial invoice, packing list, and country-of-origin documentation. ATEX/IECEx certificates and material test reports (MTR) can be included in the shipping package for regulated industries.

Contact Information

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