Bently Nevada 330701-00-25-10-11-05 Proximity Probe – 3300 XL Series

Bently Nevada 330701-00-25-10-11-05 — 8mm Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330701-00-25-10-11-05 is an 8 mm eddy-current proximity transducer belonging to the 3300 XL series, designed for continuous, non-contact measurement of radial shaft vibration and axial position in turbomachinery and other critical rotating equipment. Within a machinery protection loop, this probe occupies the first and most consequential position in the signal chain: it converts mechanical displacement into a proportional DC voltage that downstream monitors, DCS systems, and safety instrumented systems (SIS) rely upon for alarm and trip decisions. Any drift, non-linearity, or installation error at the probe level propagates directly into protection accuracy, making component selection and specification verification a primary engineering responsibility.

This unit carries the full 3300 XL designation, confirming compatibility with the Bently Nevada 3300 XL Proximitor® driver ecosystem. The -25 suffix specifies a 25 mm integral probe cable; the -10 suffix denotes the standard connector configuration; the -11 suffix indicates stainless steel armored cable construction; and the -05 suffix specifies a 5 m extension cable. Together, these options produce a field-ready transducer assembly suited for installations where the monitor cabinet must be located away from the machine casing — a common requirement in high-temperature or hazardous-area environments.

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Technical Parameters

Hardware Logical Analysis

The 330701-00-25-10-11-05 operates on the eddy-current (electromagnetic induction) principle. The probe tip houses a wound coil driven by a high-frequency oscillator circuit located in the paired Proximitor® driver. When the probe tip is positioned near a conductive target, the oscillating magnetic field induces eddy currents in the target surface. These eddy currents create a counter-magnetic field that loads the oscillator, reducing its amplitude in proportion to the gap distance. The Proximitor® demodulates this amplitude change and outputs a linear DC voltage: at the nominal 1.0 mm gap, the output is approximately –10.0 VDC; at 0.25 mm it approaches –2.0 VDC; at 2.25 mm it approaches –18.0 VDC. The 200 mV/mil (7.87 V/mm) scale factor is the critical calibration constant that all downstream alarm and trip setpoints reference.

EMC Design: The stainless steel armor (suffix -11) provides a continuous Faraday shield along the extension cable run, attenuating capacitively coupled interference from adjacent power cables, VFD outputs, and high-voltage bus bars — a practical necessity in switchgear rooms and motor control centers where cable trays are densely populated. The coaxial cable geometry maintains a controlled characteristic impedance, preventing reflections that would distort the high-frequency carrier signal and introduce measurement error at the Proximitor® input.

Thermal Stability: The 316L stainless steel housing exhibits a low and predictable coefficient of thermal expansion. Over the –35°C to +177°C operating range, dimensional change in the probe tip geometry remains within the tolerance band that preserves scale factor accuracy. This is particularly relevant in steam turbine applications where casing temperatures fluctuate significantly during startup, load changes, and shutdown transients.

Target Material Sensitivity: The eddy-current field penetration depth is a function of target material resistivity and magnetic permeability. The standard 200 mV/mil calibration is referenced to AISI 4140 steel. For shafts manufactured from 17-4PH stainless, Inconel 718, or titanium alloys, the effective scale factor deviates — in some cases by 10–20% — requiring either a material correction factor applied in the monitor configuration or a factory recalibration of the Proximitor® to the specific target alloy. Engineers specifying this probe for non-standard shaft materials must account for this in their alarm setpoint calculations.

System Integration Benefits

• Direct API 670 Compliance: The 3300 XL series is explicitly listed in API 670 Annex D as a qualified eddy-current transducer system. This eliminates the qualification testing burden for EPC contractors and end-users operating under API-governed specifications.
• Deterministic Signal Latency: The DC-to-10 kHz frequency response ensures that sub-synchronous, synchronous, and super-synchronous vibration components — including blade-pass frequencies in multi-stage compressors — are captured without phase lag distortion, preserving the integrity of orbit plots and Bode diagrams used in machinery diagnostics.
• Plug-and-Play with 3300 XL Monitors: The probe is factory-calibrated as a matched system with the 3300 XL Proximitor® driver. No field calibration of the scale factor is required when replacing a like-for-like unit, reducing maintenance window duration and the risk of calibration error.
• Armored Cable Mechanical Protection: The stainless steel armor withstands the mechanical abrasion, vibration fatigue, and rodent damage that frequently cause cable failures in long cable runs through machinery plenums and cable trays, reducing nuisance trips caused by intermittent open-circuit faults.
• 5 m Extension Flexibility: The 5 m extension cable allows the Proximitor® driver to be mounted in a temperature-controlled instrument enclosure remote from the machine, keeping the active electronics within their rated operating temperature range even when the machine casing surface temperature exceeds 100°C.
• Diagnostic Transparency: The linear DC output voltage is directly readable with a standard multimeter at the Proximitor® output terminals, enabling field technicians to verify probe gap, check for cable continuity, and confirm system health without specialized test equipment during commissioning and troubleshooting.
• SIS Integration Compatibility: The –24 VDC supply and 0–18 VDC output range are compatible with standard safety PLC analog input modules (e.g., Siemens ET 200SP, Rockwell 1734-IE4C) configured for 0–10 V or 0–20 V input ranges, facilitating integration into IEC 61511-compliant safety instrumented functions without signal conditioning hardware.
• Long Mean Time Between Failures (MTBF): The absence of moving parts, the hermetically sealed probe body, and the IP67 rating combine to produce a transducer with a service life measured in decades under normal operating conditions, reducing the lifecycle cost of the machinery protection system compared to contact-type sensors.

Quality Assurance & Global Logistics

Every Bently Nevada 330701-00-25-10-11-05 unit stocked at siemensplc.com is sourced through verified industrial supply channels and undergoes a structured incoming inspection protocol before being made available for order. Inspection steps include visual examination of the probe housing, connector, and cable armor for transit damage; part number label verification against the purchase order and manufacturer documentation; packaging seal integrity check to confirm factory-original condition; and traceability documentation review. Certificate of Conformance (CoC) and test reports are available upon request for quality-critical procurement processes.

Logistics operations are based in Xiamen, China — a major international port city with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard in-stock orders are processed within 1 business day and dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to most destinations in Southeast Asia, the Middle East, Europe, and North America. For time-critical plant shutdowns or emergency maintenance situations, same-day dispatch is available on confirmed in-stock items. Export documentation including commercial invoice, packing list, and HS code 9031.80 classification support is provided as standard. For orders requiring ATEX/IECEx documentation packages or country-specific import permits, contact the sales team in advance to allow preparation time.

Contact Information

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WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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