Bently Nevada 330104-00-05-20-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-05-20-02-05 — 8 mm Eddy-Current Proximity Probe for Rotating Machinery Protection

The Bently Nevada 330104-00-05-20-02-05 is an 8 mm diameter eddy-current proximity probe belonging to the 3300 XL Series platform. It performs non-contact, continuous measurement of shaft radial vibration, axial position, and differential expansion in critical rotating machinery. The probe operates as the field-sensing element of a three-component measurement chain: probe body, extension cable (330130 series), and Proximitor sensor (330180 series). Each chain is factory-matched and calibrated as a set to maintain a nominal scale factor of 7.87 V/mm (200 mV/mil) across the full linear measurement range of 0.25 mm to 2.25 mm.

The 330104-00-05-20-02-05 designation encodes specific mechanical and electrical configuration: 8 mm probe diameter, 5 m integral cable, 20 mm thread length, standard armored jacket, and a 5 m total system cable length. This configuration is among the most widely deployed in API 670-compliant machinery protection systems across oil and gas, power generation, and heavy process industries.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-05-20-02-05 operates on the Lenz-law eddy-current principle. A high-frequency oscillator within the Proximitor drives an alternating magnetic field through the probe coil. When a conductive target (shaft) enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The Proximitor demodulates this amplitude change into a DC voltage proportional to the probe-to-target gap. The relationship is linear within the 0.25–2.25 mm window, with non-linearity typically held below ±0.5% of full-scale output across the calibrated range.

EMC and Noise Immunity: The integral coaxial cable construction provides continuous 360° shielding from probe tip to Proximitor input. The shield is grounded at the Proximitor end only, forming a single-point ground that eliminates ground-loop currents — a common noise source in industrial environments with multiple grounding potentials. The armored outer jacket provides mechanical protection against abrasion and rodent damage while adding a secondary Faraday shield against radiated EMI from variable-frequency drives and high-current bus bars operating in proximity to the cable run.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low thermal coefficient of expansion. This construction minimizes coil geometry change across the −35 °C to +177 °C operating range, keeping scale factor drift within the ±1% specification over temperature. In high-temperature bearing housings — common in steam turbine applications where bearing metal temperatures can reach 120–150 °C — this thermal stability eliminates the need for temperature compensation corrections in the monitor configuration.

Factory-Matched Calibration: The probe, extension cable, and Proximitor are calibrated as a matched set. The Proximitor’s internal gain and offset are trimmed to compensate for the specific impedance characteristics of the probe coil and cable assembly. Substituting an unmatched probe into an existing cable/Proximitor pair introduces a scale factor error that is not detectable by the monitor’s self-test routines — a critical reason why the 330104-00-05-20-02-05 must be replaced as part of a matched set or re-verified in the field using a calibration fixture.

Connector Integrity: The MIL-C-17 compatible coaxial connector at the probe body uses a gold-plated center pin and PTFE dielectric. Gold plating prevents oxidation-induced contact resistance increase over multi-year service intervals. PTFE dielectric maintains stable impedance characteristics across the full temperature range, preventing signal reflections that would appear as measurement noise at high shaft speeds (above 3,000 RPM, where 1× vibration frequencies exceed 50 Hz).

System Integration Benefits

• API 670 Compliance Out of the Box: The 330104-00-05-20-02-05 meets all probe-level requirements of API 670 5th Edition, including scale factor tolerance, frequency response, and temperature rating. No field modification or supplemental documentation is required for machinery protection system certification audits.
• Deterministic DC-Coupled Output: The DC-coupled output from the Proximitor preserves both the static gap (DC component) and dynamic vibration (AC component) in a single signal. This allows a single channel to simultaneously monitor shaft centerline position and vibration amplitude — reducing channel count and wiring complexity versus AC-only sensors.
• Broad Monitor Compatibility: The 7.87 V/mm scale factor is the industry-standard eddy-current output recognized natively by Bently Nevada 3500 Series monitors, as well as third-party systems from Emerson, Metso, and others that accept standard proximity inputs. No signal conditioning or scaling modules are required.
• Non-Contact Operation Eliminates Wear: With no physical contact between probe and shaft, the sensor has no mechanical wear mechanism. Mean time between replacement is determined by environmental degradation (cable jacket, connector corrosion) rather than fatigue — enabling 4–6 year service intervals aligned with typical plant turnaround schedules.
• Hazardous Area Deployment: FM, CSA, ATEX, and IECEx approvals cover Class I Division 1 & 2 (North America) and Zone 0/1/2 (IEC) hazardous locations. A single part number satisfies global project specifications without regional variants, simplifying procurement and spare parts inventory management.
• Wide Frequency Bandwidth for Diagnostic Depth: The DC–10,000 Hz frequency response captures not only 1× and 2× running speed vibration but also sub-synchronous instability (oil whirl at 0.43–0.48×), blade-pass frequencies, and gear-mesh harmonics. This bandwidth supports both protection (alarm/trip) and condition monitoring (trend analysis) functions from a single sensor installation.
• System 1 Software Integration: When connected through a 3500 Series monitor, the probe signal feeds directly into Bently Nevada System 1 software for real-time orbit plots, trend logging, and alarm management. No additional signal conditioning hardware is required between the monitor and the software historian.
• Spare Parts Standardization: The 330104-00-05-20-02-05 is one of the highest-volume 3300 XL configurations globally. Its widespread adoption means spare units are available from multiple authorized and surplus channels, reducing lead time risk for emergency replacements during unplanned outages.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-05-20-02-05 unit dispatched from our Xiamen, China facility is sourced through verified supply channels with full traceability to original manufacturer documentation. Pre-shipment inspection covers connector pin integrity, cable jacket continuity, coaxial shield resistance, and dimensional verification of the probe tip geometry. Units are packaged in anti-static, moisture-barrier film with silica gel desiccant and foam-lined cartons rated for air freight handling per IATA 6.2 standards.

Shipping from Xiamen Gaoqi International Airport (XMN) provides direct air freight access to major industrial hubs: Singapore (4 h), Dubai (9 h), Rotterdam (12 h), Houston (14 h), and Tokyo (3 h). DHL Express, FedEx International Priority, and UPS Worldwide Express are standard carriers. For project-volume orders, sea freight via Xiamen Port to any global destination is available with full export documentation including commercial invoice, packing list, certificate of origin, and MSDS where applicable.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit. Replacement units are dispatched from Xiamen stock, with express air freight at no additional charge for confirmed warranty cases.

Contact Information

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