Bently Nevada 330881-28-00-200-06-02 Proximity Transducer – 3300 Series

Bently Nevada 330881-28-00-200-06-02 — Eddy-Current Proximity Transducer for Continuous Shaft Displacement Monitoring

The 330881-28-00-200-06-02 is a metric-thread eddy-current proximity transducer manufactured by Bently Nevada as part of the 3300 Series vibration monitoring platform. Its primary function within a machinery protection control loop is to convert the physical gap between the probe tip and a conductive target surface into a proportional DC voltage signal, enabling real-time measurement of radial shaft vibration, axial thrust position, and differential expansion on rotating equipment.

Within a closed-loop protection architecture, this transducer operates as the field-sensing element upstream of the oscillator/driver and the rack-mounted monitor. The 330881 body carries a 28 mm metric thread, a 200 cm factory-terminated integral cable, and a Type-06 connector, making it a direct-fit replacement in existing 3300 XL installations without requiring monitor recalibration when the scale factor is preserved. The –24 VDC bias output and 7.87 V/mm (200 mV/mil) scale factor are fully compatible with the Bently Nevada 3300 XL 8 mm driver family and the 3500 Series monitor chassis via standard adapter.

This transducer is specified for deployment in API 670-compliant machinery protection systems across power generation, oil and gas compression, petrochemical processing, and heavy rotating equipment applications where continuous, uninterrupted shaft position data is a safety and reliability requirement.

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Technical Parameters

Hardware Logical Analysis

The 330881-28-00-200-06-02 operates on the principle of electromagnetic induction. The probe tip houses a wound coil energized by a high-frequency oscillator signal (typically 1.0 MHz) supplied through the extension cable from the 330180-series driver. When the probe approaches a conductive target, eddy currents are induced on the target surface, loading the coil and reducing its impedance. The driver circuit converts this impedance change into a DC voltage proportional to the probe-to-target gap — a relationship that remains linear within the 0–2.0 mm sensing range.

EMC Design: The 316L stainless steel housing provides a continuous Faraday shield around the coil assembly, attenuating external RF interference that would otherwise corrupt the low-level impedance signal. The factory-terminated 200 cm integral cable uses a coaxial construction with a braided shield bonded to the housing ground, maintaining signal integrity across the full cable run without field splicing. This eliminates the impedance discontinuities and ground-loop noise that arise from field-assembled cable joints.

Thermal Stability: The coil former material and winding geometry are selected to minimize the temperature coefficient of inductance across the –35 °C to +177 °C operating envelope. This ensures that the scale factor (7.87 V/mm) remains within specification without temperature compensation at the monitor level, reducing false alarm probability in high-temperature turbine bearing housings.

Mechanical Robustness: The M28 metric thread body is machined to tight tolerances, ensuring repeatable probe tip positioning during installation and replacement. The IP67 rating confirms the housing seal integrity under temporary immersion, protecting the coil assembly from condensation, lubricating oil ingress, and wash-down fluids common in compressor and pump environments.

Signal Chain Integrity: The –24 VDC bias output is the reference point for gap measurement at the monitor. A correctly installed 330881 transducer will present a bias voltage between –10 VDC and –18 VDC at the nominal 1.0 mm installation gap, providing the monitor with a mid-range operating point that maximizes the usable dynamic range for both positive and negative shaft excursions.

System Integration Benefits

• Direct 3300 XL Compatibility: The 7.87 V/mm scale factor and –24 VDC bias are native to the 3300 XL driver family. No monitor channel reconfiguration or scale factor adjustment is required when replacing an existing 330881 unit, preserving alarm and danger setpoints without engineering intervention.
• API 670 Compliance Path: The transducer’s electrical characteristics and environmental ratings align with API Standard 670 requirements for proximity transducer systems, supporting the compliance documentation process for new installations and audits.
• Deterministic Response Time: The eddy-current sensing mechanism has no mechanical moving parts and no hysteresis in the electromagnetic domain. The signal update rate is governed by the driver oscillator frequency (1.0 MHz), enabling the monitor to resolve shaft vibration events at frequencies well above the 10 kHz bandwidth of most 3500 Series monitor channels.
• Diagnostic Transparency: The bias voltage output provides a continuous, passive health indicator. A bias reading outside the –10 V to –18 V window at the nominal gap immediately flags installation error, cable damage, or probe contamination — without requiring the machine to be shut down for inspection.
• Reduced Installation Risk: The factory-terminated 200 cm integral cable eliminates the field-assembled connector joint that is the most common source of signal degradation in proximity transducer installations. The Type-06 connector mates directly with the 330130-series extension cable without soldering or crimping.
• Multi-Parameter Measurement: A single 330881 transducer can serve radial vibration, axial position, or eccentricity measurement functions depending on its mounting orientation and the monitor channel configuration, reducing the number of distinct spare part numbers required in a plant inventory program.
• Broad Target Material Tolerance: While optimized for AISI 4140 steel, the transducer maintains acceptable linearity on a range of ferromagnetic shaft materials. The driver’s internal calibration resistor network compensates for minor target conductivity variations, extending applicability across mixed-material rotor designs.
• Long-Term Spare Parts Availability: The 3300 Series platform has been in continuous production for over two decades. The 330881 body dimensions and electrical interface are backward-compatible with earlier 3300 XL installations, making this transducer a viable long-term spare for aging machinery protection systems without requiring system-level upgrades.

Quality Assurance & Global Logistics

Every 330881-28-00-200-06-02 unit supplied through siemensplc.com is sourced from verified supply channels and subjected to a structured pre-shipment inspection protocol. Physical inspection covers housing integrity, thread condition, cable sheath continuity, connector pin alignment, and label legibility against the declared SKU. Bias voltage output is bench-verified against the Bently Nevada factory specification prior to packaging.

Units are shipped from our warehouse in Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. In-stock units are dispatched within 1–3 business days of order confirmation. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared for each shipment. The applicable HS Code for customs classification is 8543.70 (electronic transducers and sensors). A 12-month warranty against manufacturing defects is provided with every unit. Bulk order pricing and consolidated freight arrangements are available for procurement quantities of 5 units or more — contact us directly for a formal quotation.

Contact Information

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