Bently Nevada 330904-00-23-50-02-00 Proximity Transducer – 3300 XL NSv

Bently Nevada 330904-00-23-50-02-00 — 3300 XL NSv 8 mm Eddy-Current Proximity Transducer System

The 330904-00-23-50-02-00 is a factory-matched, non-contact eddy-current proximity transducer system from Bently Nevada’s 3300 XL NSv (Non-Standard Voltage) series. It is engineered for continuous shaft displacement and radial vibration measurement on critical rotating machinery operating in API 670-compliant protection architectures. The system ships as a pre-calibrated, three-component assembly — 8 mm armored probe, 5.0 m extension cable, and NSv driver/oscillator — ensuring a traceable scale factor of 7.87 V/mm (200 mV/mil) without field re-calibration.

Unlike standard −24 VDC 3300 XL variants, the NSv configuration operates with a modified driver bias circuit that shifts the linear output window to accommodate specific monitor channel input requirements in legacy and current-generation 3500 Series racks. This distinction is not interchangeable: substituting a standard 330900-series probe into an NSv driver will produce a systematic scale factor error exceeding ±8%, triggering false alarms or masking real shaft excursions. The 330904-00-23-50-02-00 eliminates this risk by delivering a matched, factory-verified system.

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Technical Parameters

Hardware Logical Analysis

The 330904-00-23-50-02-00 operates on the principle of high-frequency electromagnetic induction. The driver/oscillator generates a carrier signal in the range of 1.0 – 1.5 MHz, which is transmitted through the coaxial extension cable to the probe coil. When a conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a measurable change in coil impedance. This impedance shift is demodulated by the driver into a DC voltage proportional to the gap distance between probe tip and target surface.

The NSv driver incorporates a modified bias network that repositions the quiescent operating point of the demodulation stage. This allows the linear output range to align precisely with the input threshold of NSv-configured monitor channels in the 3500 rack, maintaining measurement integrity across the full 0 – 2.36 mm gap range without output clipping or non-linearity at the range boundaries.

EMC performance is achieved through a combination of coaxial shielding along the full cable run, ferrite suppression at the driver input stage, and the inherently differential nature of the impedance-measurement circuit. The armor jacket on the probe body provides mechanical protection against abrasion and fluid ingress while maintaining electrical continuity of the shield to chassis ground. This architecture sustains measurement accuracy in environments with conducted interference levels up to 10 V/m (per IEC 61000-4-3) and radiated field strengths common in switchgear rooms and motor control centers.

The three-component matched-set calibration approach — probe, extension cable, and driver calibrated as a unit — eliminates the cumulative tolerance stack-up that occurs when components are sourced and paired independently. Factory calibration data is recorded at 25°C with a 4140 steel target, and the resulting scale factor certificate provides the traceability baseline required by ISO 13373-2 for machinery vibration monitoring programs.

System Integration Benefits

• Direct rack compatibility: Plug-and-play installation into Bently Nevada 3500/42M, 3500/40M, and 3300 Series monitor channels configured for NSv input type — no channel re-parameterization required when replacing a like-for-like unit.
• Traceable scale factor: Factory-issued calibration certificate with NIST-traceable reference standards satisfies ISO 13373-2 documentation requirements for rotating machinery monitoring programs, reducing audit preparation time.
• Deterministic gap-voltage baseline: Pre-matched system delivers a defined quiescent gap voltage at the nominal 1.0 mm installation gap, enabling commissioning engineers to verify correct installation without a separate calibration rig.
• Reduced commissioning risk: Eliminates the re-verification cycle — gap voltage check, scale factor confirmation, and linearity sweep — that is mandatory when mixing unmatched probe and driver components from different production lots.
• Diagnostic transparency: The driver’s buffered output (OK relay and voltage monitor) provides a continuous hardware health signal to the 3500 rack, enabling the monitor to distinguish between a genuine shaft excursion and a transducer fault condition without ambiguity.
• API 670 compliance path: The system’s documented scale factor, temperature range, and approval certifications satisfy the transducer performance requirements defined in API 670 Fifth Edition, Section 5, supporting machinery protection system certification for new installations and retrofits.
• Broad target material tolerance: While optimized for AISI 4140 steel, the driver’s adjustable sensitivity trim allows field compensation for alternative target materials (e.g., 17-4 PH stainless, Inconel 718), extending applicability to compressor impellers and turbine discs without probe replacement.
• Long-term spare parts alignment: The 330904 part number family remains active in Bently Nevada’s current production catalog, ensuring forward compatibility with System 1 Evolution software and future 3500 rack firmware updates without hardware obsolescence risk.

Quality Assurance & Global Logistics

Every 330904-00-23-50-02-00 unit stocked at siemensplc.com is sourced exclusively from authorized Bently Nevada distribution channels or verified OEM surplus with full chain-of-custody documentation. Incoming inspection covers visual integrity of the armor jacket and connector terminations, coil continuity and insulation resistance measurement, gap-voltage verification at 1.0 mm against a 4140 steel reference target, and cross-check of the driver serial number against the factory calibration certificate.

Units that pass inspection are stored in ESD-controlled, climate-regulated conditions (15°C – 25°C, RH < 60%) to preserve connector integrity and cable jacket flexibility. No remanufactured, relabeled, or counterfeit stock is accepted. Each shipment is accompanied by the original factory calibration certificate, packing list, and a siemensplc.com inspection report.

Logistics are managed from Xiamen, China, with DHL Express and FedEx International Priority as primary carriers. Standard in-stock orders are dispatched within 1 – 2 business days. Export documentation — commercial invoice, packing list, certificate of origin, and ECCN/EAR classification statement — is prepared for each shipment to facilitate customs clearance in the EU, North America, Southeast Asia, and the Middle East. For time-critical plant shutdowns or turnaround projects, same-day dispatch is available on confirmed orders received before 14:00 CST.

Contact Information

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