Description

Technical Overview

Product Description

The Bently Nevada 21747-080-01 Proximitor Probe is a high-precision, non-contact eddy-current transducer engineered for continuous vibration, displacement, and position monitoring in critical rotating machinery. Designed to interface seamlessly with Bently Nevada 3300 XL and 3500 series monitoring systems, this probe delivers exceptional linearity, temperature stability, and long-term reliability under harsh industrial conditions—including extreme temperatures, oil immersion, and high-vibration environments.

Key Benefits

• Industry-Leading Accuracy: ±1% full-scale linearity across its calibrated range ensures precise shaft orbit analysis and dynamic clearance measurement.
• Robust Construction: Stainless steel housing with PTFE-insulated cable (standard 5 m length) provides corrosion resistance and EMI immunity for demanding OEM and retrofit installations.
• Plug-and-Play Integration: Compatible with standard 3300/3500 system calibration modules—no field recalibration required when used with matching extension cables and proximeters.

Typical Applications

This Proximitor Probe is widely deployed in mission-critical applications across power generation, oil & gas, petrochemical, and industrial manufacturing sectors. Common use cases include turbine and compressor shaft vibration monitoring, thrust position verification in steam/gas turbines, differential expansion sensing in large motors, and radial bearing clearance validation during commissioning and predictive maintenance programs.

Detailed Specifications

Operational Capabilities

High-Fidelity Signal Integrity

Engineered with low-noise, shielded internal circuitry, the 21747-080-01 maintains signal-to-noise ratios exceeding 80 dB across its operational bandwidth (0–10 kHz), enabling accurate detection of sub-micron shaft movements essential for early fault diagnosis.

Environmental Resilience

Rated IP67 for dust and water ingress protection, and validated for continuous operation in hydrocarbon-lubricated environments, this probe withstands exposure to steam, condensate, and aggressive process chemicals without performance degradation.

System-Level Interoperability

Compliant with IEEE Std 1129 and API RP 670 (4th ed.), the probe supports seamless integration into enterprise-wide condition monitoring platforms—including AMS Machinery Health Manager™—enabling real-time data aggregation, trend analysis, and automated alarm escalation.

Technical FAQ

Is the 21747-080-01 compatible with legacy 3300 series monitors?

Yes. This probe is fully backward-compatible with all Bently Nevada 3300 series monitoring systems when paired with appropriate 3300 XL extension cables and calibrated proximeter modules (e.g., 330180). No firmware updates are required.

What is the recommended gap voltage setting for optimal performance?

The nominal DC gap voltage is –10.0 VDC at mid-range (4.0 mm). Final setup must follow API RP 670 alignment procedures and be verified using a calibrated oscilloscope or system diagnostic tool during installation.

Can this probe be used in hazardous areas?

The 21747-080-01 itself is not intrinsically safe. For Class I, Div 1/Zone 1 installations, it must be used with an approved IS barrier (e.g., Bently Nevada 330190) and installed per NEC Article 500 or IEC 60079 guidelines.

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