Bently Nevada 330854-080-24-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330854-080-24-CN — 8mm Eddy-Current Proximity Transducer for Continuous Machinery Protection

The 330854-080-24-CN is a non-contact, eddy-current displacement transducer manufactured by Bently Nevada (a Baker Hughes company) and engineered for integration within the 3300 XL 8mm Proximity Transducer System. It serves as the primary sensing element in API 670-compliant machinery protection architectures, delivering continuous, high-resolution shaft displacement data to monitoring racks and distributed control systems in rotating equipment installations.

This CN-suffix variant is the China-market configuration, carrying identical electrical and mechanical specifications to the global 330854-080-24-00 part number while meeting domestic procurement documentation requirements for Chinese industrial facilities. The transducer is deployed across power generation, oil and gas, petrochemical refining, LNG processing, and heavy industrial machinery trains where uninterrupted vibration and position data are operationally non-negotiable.

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

Technical Parameters

Hardware Logical Analysis

The 330854-080-24-CN operates on the principle of high-frequency eddy-current induction. The probe tip houses a wound coil driven by an oscillator circuit embedded in the paired Proximitor® driver. When the probe tip is positioned within its calibrated linear range of a conductive target, the electromagnetic field induces circulating eddy currents in the target surface. These currents load the oscillator, reducing its amplitude in direct proportion to the probe-to-target gap distance. The Proximitor® demodulates this amplitude-modulated carrier and outputs a DC voltage scaled at 7.87 V/mm — a relationship that remains linear across the full 0.25 mm to 2.25 mm measurement window.

EMC and Shielding Architecture: The integral armored coaxial cable provides continuous RF shielding from probe tip to driver input, suppressing common-mode noise induced by adjacent motor drives, switchgear, and high-current bus bars. The coaxial geometry maintains a controlled characteristic impedance, preventing signal reflections that would corrupt displacement readings at frequencies above 1 kHz. The probe body is constructed from corrosion-resistant stainless steel with a hermetically sealed tip assembly, isolating the sensing coil from process fluids, oil mist, and steam condensate.

Thermal Stability: The probe’s rated operating range of –35°C to +177°C is achieved through the selection of high-temperature dielectric materials in the coil former and cable insulation. Sensitivity drift across this range is controlled to within the system’s overall accuracy budget, eliminating the need for temperature compensation circuitry in standard installations. This thermal envelope covers hot-section bearing pedestals in steam turbines and gas expanders without derating.

Target Material Sensitivity Correction: Factory calibration is performed against AISI 4140 steel. For non-standard target alloys — austenitic stainless steel, titanium, Inconel, or aluminum — the eddy-current penetration depth and resistivity differ, shifting the effective sensitivity. Scale factor corrections per Bently Nevada application engineering notes must be applied at the monitoring rack or DCS configuration level. This is a system-level consideration, not a hardware limitation of the 330854 probe itself.

Three-Component Signal Chain: The 330854-080-24-CN functions as the first element in a defined three-component chain: probe → extension cable (330130/330180 series) → Proximitor® driver. The extension cable maintains the coaxial signal path over installation distances up to the system’s specified total cable length. The Proximitor® driver provides a buffered output that can drive long cable runs to the monitoring rack without signal degradation, supporting installations where the rack is located in a remote instrument room.

System Integration Benefits

• Direct rack compatibility: The 330854-080-24-CN interfaces natively with Bently Nevada 3500 series monitoring racks via the 3300 XL Proximitor® driver, requiring no signal conditioning adapters or custom scaling at the rack input card.
• DCS and PLC interoperability: The Proximitor® buffered voltage output (–2 VDC to –18 VDC) is accepted directly by standard analog input modules on Siemens S7, ABB 800xA, Emerson DeltaV, and Honeywell Experion platforms, enabling machinery protection data to be integrated into plant-wide process control loops.
• Deterministic frequency response: The DC-to-10 kHz bandwidth captures both quasi-static shaft position changes and high-frequency vibration components including sub-synchronous instabilities, oil whirl, and blade-pass frequencies — all within a single transducer channel without range switching.
• Non-contact measurement eliminates wear: With no mechanical contact between probe and rotating shaft, the transducer has no wear mechanism under normal operating conditions. Mean time between replacement is governed by environmental degradation of the cable and connector, not by sensing element fatigue.
• IP67 ingress protection: The probe body withstands continuous immersion in oil mist, steam, and process condensate environments without seal degradation, supporting installation in bearing housings and seal cavities where fluid ingress is unavoidable.
• API 670 compliance support: The 3300 XL system, with the 330854 probe as its sensing element, is designed to meet the measurement accuracy and channel independence requirements of API Standard 670 (Machinery Protection Systems), simplifying compliance documentation for new installations and audits.
• Diagnostic transparency: The Proximitor® driver’s buffered output provides a continuous, real-time analog signal that can be monitored independently of the protection rack, enabling field engineers to verify transducer health and gap setting without interrupting the protection channel.
• Scalable system architecture: The 330854 probe is interchangeable across all 3300 XL 8mm system configurations. Replacement in the field requires only gap re-setting per the installation manual — no driver recalibration or rack reconfiguration is needed, minimizing planned maintenance downtime.

Quality Assurance & Global Logistics

Every 330854-080-24-CN unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full traceability to original Bently Nevada manufacturing documentation. Original manufacturer labeling, date codes, and serial numbers are preserved intact. Pre-shipment inspection covers visual examination of the probe body and connector, cable continuity and shield integrity verification, and confirmation of part number markings against the purchase order.

A Certificate of Conformance (CoC) is available upon request for all orders. For projects requiring additional documentation — material test reports, ATEX certificates, or country-of-origin declarations — these can be arranged at the time of order placement.

Shipments originate from our warehouse in Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard export documentation includes commercial invoice, packing list, and pre-shipment inspection report. For time-critical plant shutdowns and turnaround projects, same-day dispatch is available for in-stock units confirmed before 14:00 CST. Customs clearance support and HS code documentation are provided for all international shipments to minimize border delays.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and component failures under normal operating conditions. Warranty claims are processed with replacement dispatch within 5 business days of confirmed fault verification.

Contact Information

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