Bently Nevada 330173-00-04-10-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330173-00-04-10-02-00 — 8 mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The Bently Nevada 330173-00-04-10-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It operates on the principle of electromagnetic induction: a high-frequency oscillator (typically 1.0 MHz) drives a coil wound at the probe tip, generating an alternating magnetic field. When a conductive target — most commonly AISI 4140 steel shaft — enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a proportional DC voltage output at the Proximitor® sensor. This non-contact, wear-free measurement principle makes the 330173-00-04-10-02-00 the preferred transducer for continuous, uninterrupted shaft vibration and position monitoring in critical rotating machinery operating under API 670 machinery protection requirements.

Within a control loop, this probe functions as the primary sensing element feeding real-time displacement data to the Bently Nevada 3500 Series Machinery Protection System. The 3500 rack processes the analog voltage signal, applies configurable alert and danger setpoints, and issues relay outputs to the DCS or safety instrumented system (SIS) within deterministic scan cycles. The probe’s 7.87 V/mm (200 mV/mil) scale factor is factory-calibrated and traceable, ensuring that the engineering unit conversion at the monitor is accurate without field recalibration under normal operating conditions.

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Technical Parameters

Hardware Logical Analysis

The 330173-00-04-10-02-00 probe body is constructed from 316 stainless steel, providing resistance to corrosive process environments including wet steam, hydrocarbon condensate, and mild acidic atmospheres common in refinery and petrochemical service. The probe tip encapsulates the sensing coil in a thermoplastic compound selected for dimensional stability across the rated −35 °C to +120 °C thermal envelope, preventing coil geometry shift that would otherwise introduce scale factor drift.

EMC Design: The integral coaxial cable construction is fundamental to the probe’s electromagnetic compatibility performance. The coaxial geometry provides continuous 360° shielding of the signal conductor from the probe tip to the Proximitor® input, suppressing capacitively coupled interference from adjacent power cables, variable-frequency drives (VFDs), and high-current bus bars — all of which are common in turbomachinery enclosures. The shield is grounded at the Proximitor® end only (single-point grounding), eliminating ground-loop currents that would appear as low-frequency noise on the displacement signal.

Thermal Compensation: The 3300 XL system architecture places the oscillator and demodulator circuitry inside the Proximitor® sensor, which is mounted outside the hot zone. The probe itself contains only passive coil elements, meaning there is no active semiconductor junction at the probe tip subject to thermal drift. This passive-tip architecture maintains scale factor stability across the full operating temperature range without requiring temperature compensation algorithms in the monitor.

Mechanical Robustness: The M10 × 1.0 threaded body mates with standard proximity probe mounting brackets and lock nuts. The thread engagement length is sufficient to allow fine gap adjustment (typically set to 1.27 mm / 50 mil nominal gap for radial vibration applications) with a locking nut torqued to OEM specification, preventing gap creep under vibration. The integral cable exits the probe body through a strain-relief fitting rated for continuous flexure, resisting fatigue cracking in installations where the cable is subject to low-amplitude cyclic movement from machine vibration transmitted through the mounting structure.

System Integration Benefits

• Deterministic real-time response: The analog voltage output from the probe-Proximitor® pair is a continuous, unsampled signal. The 3500 monitor digitizes it at a fixed scan rate, delivering alarm relay actuation latency well within the 1-second requirement of API 670, supporting deterministic machinery protection response without software scheduling jitter.
• Direct DCS integration: The 3500 rack provides 4–20 mA retransmission outputs derived from the probe signal, allowing the DCS historian to log shaft position and vibration amplitude alongside process variables (temperature, pressure, flow) in a unified time-stamped data stream for root-cause analysis.
• Plug-compatible with existing 3300 XL infrastructure: The 330173-00-04-10-02-00 is electrically and mechanically interchangeable with other 8 mm probes in the 3300 XL family, enabling hot-swap replacement during planned outages without rewiring extension cables or reconfiguring Proximitor® sensors.
• Diagnostic transparency via OK relay: The Proximitor® sensor continuously monitors the probe circuit impedance. If the probe cable is open-circuited, short-circuited, or the gap moves outside the linear range, the OK relay de-energizes, providing a discrete fault signal to the DCS and preventing the monitor from issuing false machinery alarms based on a failed sensor rather than actual shaft movement.
• Keyphasor® compatibility: When configured as a phase reference transducer, the 330173-00-04-10-02-00 detects the once-per-revolution notch or keyway on the shaft, generating a voltage pulse used by the 3500 monitor for synchronous vibration analysis (1X, 2X vector tracking) and balancing calculations — without requiring a separate dedicated sensor model.
• Hazardous area deployment: ATEX and IECEx certification allows installation in Zone 1 and Zone 2 classified areas (gas groups IIA, IIB, IIC depending on Proximitor® model selected), covering the majority of refinery, offshore platform, and chemical plant installations without requiring additional intrinsic safety barriers in the field wiring.
• Reduced maintenance interval: Non-contact operation eliminates bearing wear, seal degradation, and mechanical fatigue failure modes associated with contact-type displacement sensors. Mean time between maintenance (MTBM) for eddy-current proximity systems in clean installations routinely exceeds 10 years, reducing planned maintenance costs and unplanned outage risk.
• Scalable to multi-plane monitoring: A single 3500 rack can accept inputs from multiple 330173-00-04-10-02-00 probes across X-Y radial planes and axial thrust positions, providing full API 670 Table 1 coverage for a multi-bearing machine train from a single hardware platform with unified alarm management.

Quality Assurance & Global Logistics

Every Bently Nevada 330173-00-04-10-02-00 unit supplied by siemensplc.com is sourced through verified industrial procurement channels with full lot traceability. Prior to dispatch from our Xiamen, China facility, each probe undergoes a structured pre-shipment inspection: physical integrity of the probe tip, cable jacket, and coaxial connector is verified against OEM reference standards; label and part number markings are cross-checked against the purchase documentation; and original OEM packaging with datasheet and certificate of conformance (CoC) is confirmed present.

Xiamen’s geographic position — a major southeastern China port city with direct access to Xiamen Gaoqi International Airport and Xiamen Port — enables efficient export logistics to all major industrial regions. Air freight to Southeast Asia typically arrives within 3–5 business days; to Europe and the Middle East within 5–8 business days; to North and South America within 7–12 business days. All shipments are accompanied by a commercial invoice, packing list, and CoC as standard documentation. Export compliance screening is applied to each order in accordance with applicable regulations.

A 12-month warranty covers all units against manufacturing defects from the date of shipment. Units exhibiting functional failure within the warranty period are replaced or credited following return merchandise authorization (RMA) review. Extended support arrangements are available for project-based procurement — contact our technical team to discuss.

Contact Information

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