Bently Nevada 330904-00-10-05-01-BR Proximity Probe – 3300 NSv Series

Bently Nevada 330904-00-10-05-01-BR: Eddy Current Proximity Probe for Rotating Machinery Protection

The Bently Nevada 330904-00-10-05-01-BR is a 5 mm tip-diameter, non-contacting eddy current proximity probe belonging to the 3300 NSv (Non-contacting Vibration) Series. It functions as the primary sensing transducer in a three-component measurement chain — probe, extension cable, and proximitor/oscillator — that converts rotor displacement into a calibrated DC voltage signal for continuous machinery protection monitoring. The suffix BR designates a 1-metre integral Belden-type coaxial cable, factory-terminated and matched to the probe body to eliminate field-assembly variability.

In a typical turbomachinery protection loop, the probe is threaded into a machined bracket positioned radially or axially relative to the shaft journal. The probe tip maintains a fixed air gap — nominally 1.0 mm to 1.5 mm — to the target surface. The 3300 XL Proximitor module drives the probe at approximately 1 MHz via the coaxial cable, and the eddy current field induced in the conductive target modulates the oscillator’s impedance. This impedance change is demodulated into a linear DC output of −200 mV/mil (−7.87 V/mm), which feeds directly into Bently Nevada 3500 Series rack monitors for alarm and trip processing. The 330904-00-10-05-01-BR is calibrated for use with AISI 4140 steel targets; sensitivity correction factors apply for alternative target materials.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330904-00-10-05-01-BR operates on the principle of Faraday induction: the Proximitor oscillator sustains a high-frequency electromagnetic field at the probe tip coil. When a conductive target enters this field, eddy currents are induced on the target surface, absorbing energy from the oscillator circuit and reducing the effective Q-factor of the tank circuit. The Proximitor’s demodulation stage converts this Q-factor reduction into a proportional DC voltage with a linearity error of less than ±0.5% across the calibrated range.

The 5 mm tip geometry is a deliberate engineering trade-off. Smaller tip diameters (e.g., 3 mm) offer tighter spatial resolution but require closer gap tolerances and are more sensitive to shaft surface finish variations. The 5 mm tip provides a broader linear range — approximately 2 mm — which accommodates the thermal growth and dynamic runout typical of journal-bearing turbomachinery without saturating the measurement chain. The integral 1 m BR cable eliminates the impedance discontinuity that can occur at field-assembled connectors; the cable’s characteristic impedance is matched to the probe coil and Proximitor input to preserve signal fidelity at the 1 MHz carrier frequency.

From an EMC standpoint, the coaxial cable construction provides inherent shielding against radiated interference. The shield is grounded at the Proximitor end only (single-point grounding), preventing ground loop currents that would appear as low-frequency noise on the DC output. The probe body’s 316 stainless steel housing provides mechanical shielding against conducted interference from adjacent high-current motor cables or variable-frequency drives. In installations where VFD switching frequencies overlap with the carrier, Bently Nevada recommends maintaining a minimum 300 mm separation between the probe cable and power conductors — a specification the BR cable’s construction supports without additional conduit shielding in most plant environments.

The probe’s temperature rating of −35 °C to +177 °C at the body covers the majority of bearing housing environments in gas turbines and steam turbines. The cable’s 105 °C limit is the practical installation constraint; in high-temperature zones, the extension cable (330130-series) should be routed through cooler areas, with only the probe body exposed to elevated temperatures. This thermal architecture is intentional: the probe coil’s inductance has a known, characterized temperature coefficient that the Proximitor’s calibration accounts for, maintaining measurement accuracy across the operating range.

System Integration Benefits

• Direct drop-in replacement: The 330904-00-10-05-01-BR is dimensionally and electrically identical to previous 3300 series 5 mm probes, allowing like-for-like substitution in existing bracket assemblies without mechanical modification or system recalibration when total cable length is preserved.
• Deterministic signal latency: The eddy current measurement chain introduces no digital processing delay between shaft displacement and DC output — the Proximitor’s analog demodulation delivers a real-time signal with a bandwidth of DC to 10 kHz, sufficient to capture sub-synchronous instabilities and blade-pass frequencies in most turbomachinery applications.
• Multi-parameter measurement from a single probe: Depending on mounting orientation and monitor configuration, a single 330904-00-10-05-01-BR installation can simultaneously provide radial vibration (X–Y pair), shaft centerline position, and eccentricity data to the 3500 monitor, reducing the total probe count per machine train.
• Diagnostic transparency via gap voltage: The DC gap voltage (nominally −10 VDC at 1.0 mm gap) is continuously available at the Proximitor output, enabling maintenance personnel to verify probe-to-shaft clearance without removing the probe — a critical capability during hot standby inspections.
• Compatibility with API 670 machinery protection requirements: The 3300 NSv probe and 3500 monitor combination meets the transducer performance requirements of API Standard 670 (5th Edition), the industry reference for machinery protection systems in petroleum, petrochemical, and natural gas industries.
• Scalable system architecture: The probe integrates into both simplex and redundant (dual-voting) monitor configurations within the 3500 rack, supporting 1oo2 and 2oo3 voting logic for trip circuits without requiring different probe hardware.
• Reduced maintenance interval dependency: Non-contacting measurement eliminates probe wear as a maintenance driver. Scheduled inspection intervals are determined by process conditions and plant standards rather than probe degradation, reducing planned maintenance frequency.
• Interoperability with condition monitoring software: The analog output is compatible with System 1 (Baker Hughes) and third-party condition monitoring platforms via standard 4–20 mA or ±10 V interface modules, enabling integration into plant-wide asset health management systems without signal conditioning hardware.

Quality Assurance & Global Logistics

Every Bently Nevada 330904-00-10-05-01-BR unit supplied by siemensplc.com is sourced through verified distribution channels with full part traceability. Prior to dispatch, each probe undergoes visual inspection of the tip coil, connector body, and cable jacket for mechanical integrity. Connector pin alignment and cable continuity are verified. Units are packaged in anti-static, moisture-resistant materials with foam-lined protective cases to prevent tip damage during transit.

Shipments originate from our warehouse in Xiamen, China — a major export hub with direct access to international express carriers including DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for all shipments. For customers in regulated industries, material traceability documentation and certificates of conformance are available upon request at the quotation stage.

In-stock units typically ship within 2–3 business days of order confirmation. Express delivery to major industrial hubs in Southeast Asia, the Middle East, and Europe typically achieves door-to-door transit times of 3–5 business days via DHL Express. All shipments are fully insured and tracked from dispatch to delivery confirmation. A 12-month warranty covers manufacturing defects from the date of shipment.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.

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