Bently Nevada 330103-00-04-50-11-00 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-04-50-11-00 — Eddy Current Proximity Probe in the 3300 XL Transducer System

The 330103-00-04-50-11-00 is a 5 mm diameter eddy current proximity probe manufactured by Bently Nevada (a Baker Hughes company) as part of the 3300 XL Proximity Transducer System. This specific configuration carries a 500 mm (50 cm) armored integral cable, M10 × 1 metric thread body, and is factory-calibrated for use with AISI 4140 steel targets at a nominal scale factor of 7.87 V/mm (200 mV/mil). It is the primary sensing element in a three-component transducer chain — probe, extension cable, and proximitor — that together deliver a DC voltage output proportional to the physical gap between probe tip and rotating shaft surface.

This part number is specified in OEM documentation for steam turbines, centrifugal compressors, boiler feed pumps, and large electric motors where API 670 machinery protection compliance is mandatory. The probe operates continuously without mechanical contact, making it suitable for 24/7 online monitoring at shaft speeds exceeding 30,000 RPM. Its 316L stainless steel housing and IP67-rated probe body allow deployment in environments with oil mist, process gas, and chemical exposure.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-04-50-11-00 operates on the eddy current (electromagnetic induction) principle. An oscillator circuit embedded in the proximitor drives a high-frequency AC current — typically in the range of 1 MHz to 2 MHz — through the coil wound inside the probe tip. This energized coil projects an electromagnetic field perpendicular to the probe face. When a conductive target (shaft surface) enters this field, eddy currents are induced on the target surface. These eddy currents generate a counter-magnetic field that loads the oscillator, reducing its amplitude in proportion to the probe-to-target gap distance.

The proximitor’s demodulation stage extracts the amplitude envelope of the oscillator signal and converts it to a DC voltage output. The relationship between gap distance and output voltage is linear within the calibrated range (0.25 mm to 2.25 mm), with a slope of 7.87 V/mm on AISI 4140 steel. This linearity is maintained across the full operating temperature range through internal compensation circuitry in the proximitor — the probe itself is a passive sensing element with no active electronics.

EMC Design: The 500 mm armored integral cable uses a coaxial construction with a continuous stainless steel braid shield, providing >60 dB of common-mode rejection against radiated electromagnetic interference from adjacent motor drives, switchgear, and high-current bus bars. The shield is grounded at the proximitor end only (single-point grounding) to prevent ground loop currents that would appear as low-frequency noise on the output signal. In installations near variable-frequency drives (VFDs), this shielding architecture is critical to maintaining signal integrity below the 10 Hz threshold where shaft orbit analysis is performed.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low coefficient of thermal expansion (CTE). This minimizes coil geometry change across the –35 °C to +177 °C operating range, keeping scale factor drift within ±1% of nominal across the full thermal envelope. For hot-section turbine applications where probe body temperatures approach the upper limit, the 316L stainless steel housing provides adequate thermal mass to prevent coil temperature from tracking rapid ambient transients.

Mechanical Robustness: The M10 × 1 thread allows precise axial positioning during installation. A locknut secures the probe at the calibrated gap position. The armored cable jacket resists crush loads up to 500 N/m and is rated for continuous immersion in turbine lube oil, seal gas condensate, and common industrial cleaning solvents. The IP67 rating covers the probe body; the connector junction with the extension cable requires a sealed junction box in outdoor or wash-down environments.

System Integration Benefits

• Direct API 670 Compliance: The 330103 series is the reference probe specified in API 670 (5th Edition) Annex D for radial vibration and axial position channels, eliminating the need for third-party equivalency documentation during plant audits.
• Plug-Compatible with 3500 Rack Systems: Output signal (–2 to –18 VDC, 200 mV/mil) is directly accepted by Bently Nevada 3500/40M, 3500/42M, and 3500/44M monitor modules without signal conditioning or range adjustment.
• Deterministic Signal Latency: The DC-coupled output path from probe to proximitor to monitor introduces <1 ms signal latency, ensuring that trip logic in the 3500 rack or connected safety logic solver receives vibration data within the deterministic window required for overspeed and high-vibration protection.
• Dual-Use Measurement: A single probe channel can simultaneously provide radial vibration (AC component, filtered above 1 Hz) and average shaft centerline position (DC component) to the monitor, reducing channel count and wiring cost compared to separate sensor installations.
• System 1 Software Integration: The calibrated scale factor and probe serial number can be entered directly into Bently Nevada System 1 condition monitoring software, enabling automated gap compensation, trend analysis, and alarm setpoint management without manual engineering unit conversion.
• Redundant Configuration Support: Two 330103 probes can be mounted 90° apart (X-Y configuration) on the same bearing journal to generate full shaft orbit plots. The 3500 rack’s orbit display module accepts both channels natively, providing real-time rotor dynamic visualization for machinery diagnostics.
• SIS Loop Compatibility: The –2 to –18 VDC output is within the analog input range of major safety logic solvers (Triconex, Hima, Pilz). When used in a SIL 2 machinery protection loop, the probe’s passive architecture (no internal electronics) simplifies the hardware fault tolerance (HFT) calculation under IEC 61511.
• Minimal Maintenance Overhead: With no moving parts and a solid-state sensing mechanism, the 330103 probe requires no scheduled preventive maintenance beyond periodic gap voltage verification during planned outages. This reduces maintenance labor cost and eliminates the risk of probe damage during unnecessary disassembly.

Quality Assurance & Global Logistics

Every 330103-00-04-50-11-00 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment inspection protocol. Each probe is verified for OEM labeling authenticity, connector pin continuity, cable armor integrity, and coaxial impedance consistency. Units sourced as new surplus are inspected against the original Bently Nevada factory datasheet (DS-3300-XL-en) to confirm dimensional and electrical conformance. Refurbished units are tested for scale factor linearity across the full 0.25 mm to 2.25 mm range using a calibrated gap rig before dispatch.

Documentation available upon request includes the original Bently Nevada product datasheet, calibration certificate (where applicable), pre-shipment inspection report with photographs, and a 12-month warranty certificate. For regulated industries (nuclear, offshore, pharmaceutical), full chain-of-custody records and lot traceability documentation are maintained and can be provided with the shipment.

Logistics from Xiamen are handled via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical transit times of 3–5 business days to Europe, North America, Southeast Asia, and the Middle East. Sea freight consolidation is available for bulk orders exceeding 20 units. All shipments include full tracking, commercial invoice, packing list, and country-of-origin certificate. Export classification is EAR99; no export license is required for most destinations. Customs clearance support and HS code documentation are provided as standard.

Contact Information

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