1. Product Overview
The Bently Nevada 330851-04-000-020-10-00-05 is a 25 mm series proximitor sensor system, part of the industry-standard 3300 XL 25 mm eddy current sensor family from Bently Nevada. It is purpose-engineered for non-contact measurement of shaft radial vibration, axial position, rotational speed and other critical dynamic parameters on large rotating machinery including steam turbines, centrifugal compressors, heavy-duty pumps and industrial gas turbines. This complete pre-calibrated system is fully compatible with Bently Nevada 3500, 3300 and other mainstream machinery protection and monitoring platforms, delivering high-accuracy, long-term stable performance even in harsh industrial operating environments.
2. Core Technical Specifications
- Manufacturer: Bently Nevada (Baker Hughes)
- Full Part Number: 330851-04-000-020-10-00-05
- Product Series: 3300 XL 25 mm Eddy Current Proximitor System
- Nominal Sensor Diameter: 25 mm
- System Measurement Range: 12.7 mm (0.5 inch)
- Output Sensitivity: 7.87 V/mm (200 mV/mil), factory calibrated for standard target materials
- Operating Temperature Range: -35 °C to +180 °C
- Cable Length: 5 meters (16.4 ft), fully shielded, armor-protected
- Power Supply Requirement: -17.5 V DC to -26 V DC
- Output Signal: 0 to -22 V DC proportional to measured gap
- Certifications: ATEX, IECEx, CSA certified for use in hazardous areas
- Protection Rating: IP67 for the sensor probe
- Net Weight: ~0.8 kg (complete system)
3. Key Features & Advantages
- Extended High-Temperature Tolerance: The wide -35 °C to +180 °C operating temperature range allows direct installation near high-temperature turbine casings and hot process equipment, eliminating the need for complex external cooling accessories.
- Ultra-Stable Measurement Performance: The 7.87 V/mm calibrated sensitivity maintains consistent measurement accuracy even with minor target material variations, avoiding frequent re-calibration requirements during long-term field operation.
- Full System Pre-Calibration: The complete probe, extension cable and proximitor unit are pre-calibrated as a single matched set at the factory, so no on-site calibration work is required after installation, drastically reducing commissioning time.
- Robust Industrial Design: The fully shielded armored cable and IP67-rated probe body provide excellent resistance to oil, water, dust and electromagnetic interference, ensuring reliable 24/7 operation in heavy industrial workshop environments.
- Wide Platform Compatibility: Natively compatible with Bently Nevada 3500, 3300 and 1701 series machinery monitoring systems, it can be directly used as a drop-in replacement for legacy 25 mm sensor systems without modifying existing control logic.
4. Typical Applications & Real-World Value
This 25 mm proximitor sensor system is a mission-critical monitoring component deployed across power generation, petrochemical, metallurgy and other heavy industrial facilities, delivering measurable operational and safety benefits.
- In large steam turbine units at thermal power plants, it continuously monitors shaft radial vibration and thrust position, detecting early abnormal wear signs of the rotor and bearings to prevent unplanned turbine trips caused by sudden mechanical failures.
- In refinery large centrifugal compressor units, its high-temperature resistance allows installation directly on the high-temperature compressor casing, providing stable vibration data for the machinery protection system to avoid catastrophic equipment damage during high-load operation.
- For maintenance teams operating existing Bently Nevada 3300/3500 monitoring systems, the pre-calibrated complete system can be installed and put into operation in under 30 minutes, eliminating the risk of measurement errors caused by mismatched sensor components and reducing on-site troubleshooting workload.
- For offshore oil & gas platform rotating equipment, the ATEX/IECEx hazardous area certification ensures the sensor meets strict explosion protection requirements, supporting safe and reliable continuous operation in flammable and explosive offshore environments.
