Bently Nevada 330707-00-25-10-02-00 – Eddy Current Proximity Transducer System | 3300 XL Series Platform
Engineering Background: The Bently Nevada 3300 XL Series represents the industry benchmark for non-contacting eddy current measurement in rotating machinery protection. Developed by Baker Hughes (formerly GE Bently Nevada), this platform has been deployed across power generation, petrochemical, and heavy industrial facilities worldwide for over three decades. The 330707 transducer system is engineered to deliver sub-micron resolution shaft displacement and vibration data in the most demanding continuous-duty environments.
Product Positioning: The 330707-00-25-10-02-00 is a complete proximity transducer system comprising a matched probe, extension cable, and Proximitor® sensor. It is designed for direct integration with Bently Nevada 3300 Series monitoring racks and is fully compatible with System 1® condition monitoring software. This configuration — 25 mm probe, 10 m extension cable, standard output — is the most widely specified variant for turbine and compressor shaft monitoring applications.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 330707-00-25-10-02-00 |
| Series / Platform | Bently Nevada 3300 XL Proximity Transducer System |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Measurement Principle | Eddy Current (Non-contacting) |
| Probe Tip Diameter | 25 mm (1 inch) |
| Extension Cable Length | 10 m (32.8 ft) |
| Output Configuration | Standard (02-00) |
| Linear Range | 0.25 mm – 2.25 mm (10 – 90 mil) |
| Scale Factor | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Supply Voltage | –24 VDC (–20 to –26 VDC) |
| Output Voltage Range | –1 VDC to –17 VDC |
| Temperature Range (Probe) | –35°C to +177°C (–31°F to +351°F) |
| Temperature Range (Proximitor) | –35°C to +85°C (–31°F to +185°F) |
| Target Material | AISI 4140 Steel (standard); other materials require calibration |
| Ingress Protection | IP67 (probe and connector) |
| Approvals / Certifications | CE, ATEX, IECEx, FM (intrinsically safe variants) |
| Weight | Approx. 300 g (complete system) |
| Country of Origin | United States |
Proven Application Environments
- Steam & Gas Turbines: Shaft radial vibration and axial position monitoring per API 670
- Centrifugal Compressors: Continuous shaft orbit and eccentricity measurement
- Pumps & Motors: Bearing journal displacement in high-speed rotating equipment
- Gearboxes: Gear mesh frequency analysis and shaft runout detection
- Expanders / Fans: Critical machinery protection in refinery and petrochemical plants
- Power Generation: Generator rotor position and differential expansion monitoring
Engineering Advantages
- Matched System Calibration: Probe, cable, and Proximitor® are factory-calibrated as a matched set — eliminates field calibration error and ensures API 670 compliance out of the box.
- Extended Frequency Bandwidth: DC to 10 kHz response captures both low-speed runout and high-frequency subsynchronous instabilities in a single channel.
- High-Temperature Probe Design: Rated to +177°C continuous, suitable for hot-section turbine bearing pedestals without additional thermal isolation.
- Robust Connector System: Armored extension cable with IP67-rated connectors resists oil, steam, and vibration-induced fatigue in harsh plant environments.
- Drop-in Compatibility: Direct replacement for legacy 3300 Series transducers; no rack reconfiguration or software recalibration required when replacing like-for-like.
- System 1® Integration: Native compatibility with Bently Nevada System 1® software for real-time trending, alarm management, and predictive analytics.
System Architecture & Signal Flow
The 330707 system operates on the eddy current principle: the probe tip generates a high-frequency electromagnetic field (typically 1–2 MHz). When a conductive target (shaft) enters the field, eddy currents are induced, loading the oscillator circuit. The Proximitor® sensor demodulates this signal into a DC-proportional voltage output (–1 to –17 VDC), linearly representing the gap distance between probe tip and shaft surface. This analog output feeds directly into Bently Nevada 3300 Series monitor input cards for processing, alarming, and relay actuation.
Signal Chain: Probe Oscillator → Extension Cable → Proximitor® Demodulator → –24 VDC Powered Output → Monitor Input Card → System 1® Software
Sourcing & Quality Verification
- All units sourced through verified industrial automation supply channels with full traceability documentation.
- Each system undergoes incoming inspection: visual, dimensional, and functional verification against OEM datasheet specifications.
- Matched probe/cable/Proximitor® serial numbers confirmed prior to shipment — no mixed-lot assemblies.
- Original OEM packaging and labeling preserved where available; condition disclosed (new surplus / refurbished / OEM new) in order confirmation.
- Certificate of conformance (CoC) available upon request for critical applications.
Procurement Process
- Inquiry: Submit your part number, required quantity, and delivery timeline via the contact form or email below.
- Quote: Receive a formal quotation with lead time, condition disclosure, and shipping options within 1 business day.
- Order Confirmation: Purchase order or online checkout accepted; proforma invoice available for wire transfer.
- Inspection & Dispatch: Unit inspected, photographed, and securely packaged; tracking number issued within 24–48 hours of payment clearance.
- After-Sales Support: Technical support available for installation, commissioning, and compatibility queries.
Technical FAQ
Q: Is this a complete system or individual components?
A: The 330707-00-25-10-02-00 is a complete matched system including the 25 mm probe, 10 m extension cable, and Proximitor® sensor — all factory-calibrated as a set.
Q: Is it compatible with my existing 3300 Series rack?
A: Yes. The 330707 system is a direct drop-in replacement for all 3300 XL Series monitor input channels. No hardware modification is required.
Q: Can it be used with non-steel shaft materials?
A: The standard calibration is optimized for AISI 4140 steel. For Inconel, titanium, or other alloys, a material-specific calibration factor must be applied — contact us for guidance.
Q: What is the difference between the -02-00 and -01-00 output configurations?
A: The -02-00 designates standard output (200 mV/mil scale factor). The -01-00 is a metric-calibrated variant. Ensure your monitor card input configuration matches the transducer scale factor.
Q: Do you provide installation and commissioning support?
A: Yes. Our engineering team provides remote technical support for installation, gap setting, and system verification. On-site support can be arranged for large-scale projects.
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