Bently Nevada 330907-05-30-05-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330907-05-30-05-02-05 — Reverse Mount Eddy-Current Proximity Probe for 3300 XL Machinery Protection Systems

The 330907-05-30-05-02-05 is a reverse-mount eddy-current proximity probe manufactured by Bently Nevada (a Baker Hughes company) for integration within the 3300 XL proximity measurement system. Its primary function is continuous, non-contact measurement of radial shaft vibration and rotor position on critical rotating machinery — steam turbines, centrifugal compressors, boiler feed pumps, and gearboxes — where front-access probe installation is mechanically impractical due to bearing housing geometry or cable routing constraints.

Unlike standard front-mount probes in the 330903 family, the 330907 body rotates the probe tip 180° relative to the cable exit, allowing the coaxial cable to route away from the machine centerline. This geometry is essential in compact turbine pedestals and close-coupled bearing housings where inboard cable clearance is less than 25 mm. The probe integrates directly into existing 3300 XL driver and monitor infrastructure without system recalibration, making it the preferred replacement part for reverse-mount positions in legacy and current-generation machinery protection installations.

Deployed across power generation, petrochemical refining, LNG processing, and offshore platform applications, the 3300 XL system — and this probe specifically — is designed to satisfy API 670 machinery protection instrumentation requirements. The 330907-05-30-05-02-05 configuration encodes: 5 mm tip diameter, 30-inch integral cable, 5-foot extension cable compatibility, standard BNC coaxial termination, and reverse-mount body orientation.

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Technical Parameters

Hardware Logical Analysis

The 330907-05-30-05-02-05 operates on the eddy-current induction principle. The probe tip houses a wound coil driven by an oscillator within the paired 3300 XL driver (e.g., 330180). The oscillator generates a high-frequency carrier signal — typically in the 500 kHz to 2 MHz range — which induces circulating eddy currents in the conductive target surface. As the air gap between probe tip and rotating shaft changes, the eddy-current loading on the coil alters its impedance. The driver demodulates this impedance variation into a calibrated DC output voltage at 7.87 V/mm, which the 3300 XL monitor then processes for alarm and trip logic.

Reverse-Mount Body Geometry: The 330907 body rotates the coil axis 180° relative to the cable exit port. Mechanically, the probe thread engages from the back face of the bearing housing bracket, with the sensing tip projecting inward toward the shaft. This eliminates the need for front-face clearance — a critical constraint in turbine pedestals where the inboard face is within 10–15 mm of the shaft journal. The cable exits rearward, parallel to the machine axis, enabling clean cable routing along the bearing housing without sharp bends that would degrade signal integrity.

EMC Design: The coaxial cable construction — with controlled characteristic impedance matched to the 330130 extension cable — minimizes RF pickup from adjacent motor drives, switchgear, and high-current bus bars common in industrial environments. The stainless steel probe body provides a continuous Faraday shield from tip to connector, suppressing capacitively coupled interference. The –24 VDC supply rail, referenced to the monitor chassis ground, further rejects common-mode noise on the signal return path.

Thermal Stability: The probe is rated to 177°C continuous, covering the bearing housing temperatures encountered in high-pressure steam turbine applications. The coil winding uses high-temperature magnet wire with polyimide insulation, and the potting compound maintains dielectric integrity across the full thermal range. Scale factor drift across the operating temperature range is held within ±1% of nominal — a specification critical for accurate thrust position monitoring where measurement errors translate directly to false trip events or missed machinery faults.

Mechanical Durability: The 316 stainless steel body resists corrosion from oil mist, steam condensate, and process gas atmospheres. The probe tip face is hardened to resist incidental contact during installation without deforming the coil geometry. Thread engagement depth and torque specifications are defined in the Bently Nevada installation manual to prevent probe body rotation under vibration — a failure mode that would introduce a false DC offset into the gap measurement.

System Integration Benefits

• Direct 3300 XL Compatibility: The 330907-05-30-05-02-05 is a factory-calibrated component of the 3300 XL measurement chain. Substituting this probe into an existing installation requires no driver recalibration — the 7.87 V/mm scale factor is pre-matched to the 330180/330185 driver output characteristics.
• Zero Mechanical Wear: Non-contact eddy-current sensing eliminates probe-to-shaft contact. There is no wear mechanism on either the probe tip or the shaft journal, enabling continuous 24/7 operation across multi-year maintenance intervals without probe replacement driven by wear.
• Deterministic Frequency Response: The DC-to-10 kHz bandwidth captures both quasi-static rotor position (thrust position, slow-roll runout) and dynamic vibration events up to the 10th harmonic of a 60,000 RPM machine — covering the full spectrum of machinery faults detectable by proximity measurement.
• API 670 Compliance: Satisfies the instrumentation requirements of API Standard 670 (Machinery Protection Systems), the governing specification for rotating equipment protection in oil and gas, petrochemical, and power generation facilities. Compliance is required by most insurance underwriters and plant safety management systems.
• Reverse-Mount Access: Enables probe installation in bearing housings where front-face access is blocked by coupling guards, piping, or structural steel — expanding the range of machinery that can be instrumented without mechanical modification to the machine or its support structure.
• Diagnostic Transparency: The linear DC output voltage provides a direct, interpretable signal for gap verification during installation and maintenance. Technicians can measure the bias voltage with a standard multimeter to confirm correct probe gap without specialized test equipment.
• Redundancy-Ready Architecture: The 3300 XL system supports dual-probe redundant configurations. The 330907-05-30-05-02-05 can be installed as the primary or redundant sensor in a two-probe radial vibration channel, with the monitor performing automatic switchover on probe fault detection.
• Broad Target Material Compatibility: While optimized for AISI 4140 steel targets, the probe operates with any ferromagnetic or non-ferromagnetic conductive target material, provided the scale factor is verified against the actual target material using the Bently Nevada target material correction procedure.

Quality Assurance & Global Logistics

Every 330907-05-30-05-02-05 unit supplied through siemensplc.com is sourced as genuine Bently Nevada / Baker Hughes manufactured hardware. Units are inspected prior to shipment: coil continuity, insulation resistance, and connector integrity are verified against 3300 XL calibration reference standards. Where full traceability documentation is available, original part number labels and batch records ship with the unit. Packaging uses anti-static, moisture-barrier materials with foam-lined protective cases to prevent tip damage and connector contamination during transit.

Logistics operations are based in Xiamen, China — a major international freight hub with direct DHL, FedEx, and UPS express services to North America, Europe, the Middle East, Southeast Asia, and Australia. Standard express delivery time is 3–7 business days from payment confirmation. For urgent plant shutdowns or unplanned outages, same-day dispatch is available on confirmed in-stock units. All shipments include commercial invoice and packing list documentation for customs clearance. HS code classification and export documentation are prepared in compliance with Chinese customs regulations and destination country import requirements.

A 12-month warranty covers manufacturing defects. Technical support for installation verification, gap setting, and system integration questions is available from our engineering team via email and WhatsApp.

Contact Information

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