Bently Nevada 330701-00-30-10-01-00 Proximity Probe – 3300 XL Series

Bently Nevada 330701-00-30-10-01-00: 8mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring in Rotating Machinery

The Bently Nevada 330701-00-30-10-01-00 is an 8mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It is designed for non-contact, continuous measurement of shaft radial vibration and axial position in turbines, compressors, pumps, and gearboxes operating under API 670 machinery protection requirements. The probe operates on the eddy-current principle: a high-frequency oscillator drives a coil wound at the probe tip, generating an electromagnetic field. When a conductive target surface enters this field, eddy currents are induced, loading the oscillator and producing a DC output voltage that is linearly proportional to the gap between probe tip and target. This mechanism eliminates all mechanical contact with the rotating shaft, yielding a theoretically unlimited service life under normal operating conditions.

The 330701-00-30-10-01-00 variant specifies a 1.0 m integral cable with armored sheath, a standard 8mm probe body, and a metric thread mounting configuration. It is calibrated for use with the Bently Nevada 3300 XL Proximitor driver, which conditions the raw oscillator signal into a standardized ±24 VDC-powered output. The linear measurement range is 0 to 2.0 mm with a nominal sensitivity of 7.87 V/mm (200 mV/mil), traceable to the Bently Nevada factory calibration standard documented in datasheet 141193-01.

In a typical API 670 installation, this probe is mounted radially at the bearing housing, paired with a 330130-series extension cable and a 330180-series Proximitor. The Proximitor output feeds directly into a Bently Nevada 3500-series rack monitor — such as the 3500/40M or 3500/42M — where the signal is processed against alarm and danger setpoints for radial vibration (typically expressed in µm pk-pk or mils pk-pk). The deterministic signal path from probe tip to rack I/O card introduces less than 1 ms of latency, which is critical for machinery protection systems where trip response time is contractually specified.

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Technical Parameters

Hardware Logical Analysis

The 330701-00-30-10-01-00 probe body is constructed from 316 stainless steel with a PEEK (polyether ether ketone) tip insert. PEEK is selected for its dielectric stability across the full operating temperature range and its resistance to hydrocarbon fluids, steam condensate, and bearing lubricants — all common contaminants in turbomachinery environments. The coil winding inside the tip is encapsulated in a thermally stable epoxy compound that maintains dimensional integrity under thermal cycling, preventing sensitivity drift that would otherwise require field recalibration.

The armored integral cable uses a double-shielded coaxial construction: an inner polytetrafluoroethylene (PTFE) dielectric surrounds the center conductor, followed by a braided copper shield, a second PTFE layer, and an outer stainless-steel armor braid. This construction achieves a characteristic impedance of 50 Ω ± 2 Ω across the cable length, which is critical for maintaining the oscillator Q-factor and preventing standing-wave reflections that would introduce nonlinearity into the output. The armor braid also provides mechanical protection against abrasion and rodent damage in cable trays.

From an EMC design perspective, the probe’s coaxial cable acts as a Faraday shield, attenuating radiated interference from variable-frequency drives (VFDs), high-current bus bars, and RF sources common in industrial plants. The Proximitor driver further applies a low-pass filter with a corner frequency above the maximum machinery vibration frequency of interest (typically 10 kHz for high-speed turbines), rejecting conducted noise while preserving the vibration signal bandwidth. The result is a signal-to-noise ratio sufficient to resolve shaft vibration amplitudes as small as 2.5 µm pk-pk — a specification that is relevant for early-stage bearing wear detection before macroscopic damage occurs.

The probe’s static gap sensitivity is factory-characterized on a calibration rig using a certified AISI 4140 steel target. The calibration curve is stored in the Bently Nevada calibration database and referenced by the probe’s serial number. Field users can verify probe health by measuring the Proximitor output voltage at a known static gap using a feeler gauge — a procedure that requires no specialized test equipment and can be performed during scheduled maintenance outages without removing the probe from its mounting bracket.

System Integration Benefits

• Deterministic signal latency below 1 ms: The analog signal path from probe tip through Proximitor to rack I/O card introduces no digital processing delay, ensuring that the 3500-series monitor can execute a machinery trip within the response time specified by API 670 (typically 1 ms for danger-level events).
• Direct compatibility with 3500-series rack architecture: The probe’s output voltage range (−2 VDC to −18 VDC across the linear range) is matched to the input conditioning circuitry of the 3500/40M and 3500/42M monitor cards, eliminating the need for signal conditioning adapters or range-shifting resistor networks.
• Zero-recalibration drop-in replacement: The 330701-00-30-10-01-00 is dimensionally and electrically identical to previous 3300 XL probe variants with the same tip diameter and cable length. Replacement requires only probe removal, thread cleaning, reinstallation to the specified gap (typically 1.0 mm ± 0.05 mm), and verification of Proximitor output — no rack configuration changes are needed.
• Dual-probe redundancy support: The 3500/40M monitor card accepts two probe inputs per channel, enabling XY radial vibration measurement with a single card slot. The 330701-00-30-10-01-00 can be deployed in both the X and Y positions, with the 90° angular offset between probes providing full orbital plot data for shaft centerline analysis.
• ATEX and FM dual certification: The probe carries both European ATEX and North American FM certifications, allowing a single part number to be deployed in hazardous-area installations across different regulatory jurisdictions without sourcing a region-specific variant.
• Diagnostic transparency via gap voltage monitoring: The Proximitor’s DC output voltage at the static operating gap is a direct indicator of probe-to-shaft clearance. Trending this value over time reveals bearing wear (decreasing gap) or shaft bow (oscillating gap), providing a maintenance-actionable signal without additional instrumentation.
• Compatibility with System 1 software: Bently Nevada System 1 condition monitoring software natively processes the 3500-series rack data, including the 330701-00-30-10-01-00 probe’s vibration and position signals, enabling automated alarm management, trend analysis, and predictive maintenance scheduling without custom integration work.
• Low thermal sensitivity coefficient: The probe’s sensitivity variation across its full operating temperature range (−35°C to +177°C) is specified at less than ±0.5% of full-scale output, which is negligible for machinery protection applications and eliminates the need for temperature compensation in the monitor configuration.

Quality Assurance & Global Logistics

Every Bently Nevada 330701-00-30-10-01-00 unit supplied through siemensplc.com is sourced from verified industrial supply channels with full traceability to the Baker Hughes / Bently Nevada manufacturing and distribution network. Units are not refurbished, relabeled, or repackaged from third-party sources. Each probe is inspected upon receipt at our Xiamen facility for the following: tip integrity and PEEK insert condition, cable armor continuity and sheath abrasion, connector seating and coaxial impedance, and label legibility including full part number and serial number. Where calibration verification equipment is available, static gap output voltage is cross-checked against the published sensitivity specification before dispatch.

Packaging follows anti-static and moisture-control protocols: each probe is individually wrapped in conductive foam, sealed in a moisture-barrier bag with desiccant, and placed in a rigid corrugated carton with foam end-caps. The carton is labeled with the full part number, serial number, and lot traceability reference. For international shipments, a commercial invoice, packing list, and certificate of origin are included as standard documentation. Export classification is handled in compliance with applicable dual-use regulations.

Dispatch from Xiamen, China is typically within 48 hours for in-stock units. Standard international freight options include DHL Express (3–5 business days to most destinations), FedEx International Priority, and UPS Worldwide Expedited. Sea freight consolidation is available for bulk orders of 10 units or more. Volume pricing is available for orders of 5 units or more — contact [email protected] with your required quantity and delivery timeline for a formal quotation. A 12-month seller warranty covers defects identified on arrival or within the warranty period under normal operating conditions.

Contact Information

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