Bently Nevada 330704-000-100-10-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330704-000-100-10-02-00 — Eddy-Current Proximity Probe for Rotating Machinery Protection

The Bently Nevada 330704-000-100-10-02-00 is a 100 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It is engineered for continuous, non-contact measurement of radial shaft vibration and axial position displacement in high-speed rotating machinery. The probe operates on the principle of electromagnetic induction: a high-frequency oscillating magnetic field generated at the probe tip induces eddy currents in the conductive target surface, and the resulting impedance change is converted by the Proximitor sensor into a proportional DC voltage signal. This mechanism eliminates mechanical contact entirely, removing wear as a failure mode and enabling indefinite service life under normal operating conditions.

Within a turbomachinery protection loop, this probe functions as the primary sensing element. Its output feeds directly into Bently Nevada 3500-series monitors, where the signal is processed against alarm and danger setpoints. The 7.87 V/mm (200 mV/mil) sensitivity characteristic provides sufficient resolution to detect sub-micron shaft displacement events, which is a prerequisite for early-warning diagnostics in API 670-compliant protection systems. The M10 × 1 metric thread body allows precise gap adjustment during commissioning, and the integral 10 ft (3.05 m) cable routes directly to the extension cable junction without intermediate connectors that could introduce signal degradation.

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Technical Parameters

Hardware Logical Analysis

The 330704-000-100-10-02-00 probe body is constructed from 316L stainless steel, selected for its non-magnetic properties and resistance to process fluid corrosion. The active tip encapsulates a precision-wound coil embedded in a thermally stable epoxy matrix rated to 177 °C continuous exposure. This construction prevents coil geometry drift under thermal cycling — a failure mode common in lower-grade proximity probes where coil deformation shifts the sensitivity constant and introduces measurement offset without triggering a fault condition.

The integral cable uses a coaxial construction with a polytetrafluoroethylene (PTFE) dielectric, which maintains consistent characteristic impedance across the operating temperature range. PTFE’s low dielectric loss tangent (approximately 0.0002 at 1 MHz) minimizes signal attenuation along the cable run, preserving the high-frequency components of the vibration waveform that are critical for sub-synchronous instability detection in fluid-film bearing machines.

Electromagnetic compatibility (EMC) is addressed through the coaxial cable shield, which provides continuous 360° coverage from the probe body to the connector. This geometry attenuates common-mode interference from variable-frequency drives, high-voltage switchgear, and RF sources typically present in industrial plant environments. The shield termination at the Proximitor sensor completes the Faraday enclosure, ensuring that the signal path from probe tip to monitor input remains isolated from plant ground noise. In installations where ground loops are a concern, the single-point grounding architecture of the 3300 XL system — grounded at the monitor chassis only — prevents circulating currents that would otherwise appear as low-frequency noise on the vibration channel.

The M10 × 1 thread pitch provides 1 mm of axial travel per full rotation during gap setting, giving the commissioning engineer fine control over the initial gap position. The standard commissioning gap for this probe-Proximitor combination is 1.27 mm (50 mil), placing the operating point at the center of the linear range and maximizing the available measurement window in both directions before the probe enters the nonlinear region.

System Integration Benefits

• Direct API 670 Compliance: The 330704-000-100-10-02-00 is a listed component within the Bently Nevada 3300 XL system, which is designed and documented to satisfy API Standard 670 (5th Edition) requirements for machinery protection instrumentation. No additional engineering justification is required for API 670 compliance documentation.
• Deterministic Signal Latency: The analog DC output of the probe-Proximitor pair introduces no digital processing delay. Signal latency from shaft displacement to monitor input is governed only by cable propagation time — negligible at the cable lengths used in practice — ensuring that the protection system responds within the monitor’s specified response time, typically ≤20 ms for danger-level trips.
• Zero Recalibration on Replacement: Because sensitivity (7.87 V/mm) and linear range are tightly controlled at the factory, a replacement 330704-000-100-10-02-00 probe installed at the correct gap requires no recalibration of the monitor’s engineering unit scaling. This reduces planned maintenance downtime to the time required for physical probe replacement and gap verification only.
• Wideband Frequency Response: The 3300 XL probe-Proximitor system maintains flat frequency response from DC to 10 kHz, covering the full spectrum of interest for rotating machinery diagnostics: 1× and 2× running speed harmonics, sub-synchronous instability (oil whirl/whip), and blade-pass frequencies on machines up to 600,000 RPM equivalent.
• Diagnostic Transparency via OK Circuit: The Proximitor sensor continuously monitors probe gap and cable integrity through its OK output. A gap outside the linear range or an open/short circuit in the probe cable drives the OK output to a defined fault state, which the 3500 monitor interprets as a channel not-OK condition. This self-monitoring architecture ensures that a failed probe is detected and alarmed rather than silently producing an erroneous reading.
• Thermal Stability Across Process Upsets: The PTFE cable dielectric and epoxy-encapsulated coil maintain calibrated sensitivity within ±0.5% across the full −35 °C to +177 °C operating range. This stability is essential in machines that experience wide temperature swings during startup, shutdown, and load transients, where a temperature-dependent sensitivity shift would produce apparent vibration changes unrelated to actual shaft motion.
• Compatibility with Existing 3300 XL Infrastructure: The probe is fully interchangeable with other 3300 XL 8 mm probes of the same cable length and connector type. Extension cables (330130 series), Proximitor sensors (330180 series), and 3500-series monitors require no modification. This backward compatibility protects the capital investment in existing monitoring infrastructure when individual probes reach end of service life.
• Reduced Mechanical Intrusion: The M10 probe body diameter minimizes the required boss diameter on the bearing housing, reducing the structural impact of probe installation on housing integrity. The non-contact measurement principle eliminates any mechanical loading on the shaft, which is a requirement for accurate vibration measurement — any contact force would alter the shaft’s dynamic response and corrupt the measurement.

Quality Assurance & Global Logistics

Every Bently Nevada 330704-000-100-10-02-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full traceability documentation. Each unit carries a manufacturer date code and lot number, and a Certificate of Conformance (COC) is available upon request for every shipment. We do not supply remanufactured, refurbished, or non-OEM substitute components. The 12-month warranty covers manufacturing defects and is supported by our technical team in Xiamen, China.

Logistics operations are managed from Xiamen, Fujian Province, China, with access to major international freight carriers including DHL Express, FedEx International Priority, and UPS Worldwide Expedited. In-stock units are dispatched within 1–3 business days of order confirmation. Export documentation — commercial invoice, packing list, and Certificate of Origin — is prepared as standard for all international shipments. The applicable HS Code for this product is 8543.70, and our logistics team can provide pre-shipment documentation to support import customs clearance in the destination country.

Bulk order pricing is available for quantities of 5 units or more. B2B customers with established accounts may request net payment terms. Contact our sales team directly for volume pricing, lead time confirmation, and technical pre-sales consultation.

Contact Information

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