Description

Technical Overview

The Bently Nevada 7200-21508-02-12-10-02 is a high-precision 3300 XL 8 mm Proximity Probe, engineered for mission-critical shaft vibration, position, and speed monitoring in industrial rotating machinery. Designed to meet the rigorous demands of power generation, oil & gas, petrochemical, and heavy manufacturing applications, this probe delivers exceptional linearity, thermal stability, and long-term repeatability—even under extreme environmental conditions including high temperature, humidity, and electromagnetic interference.

As part of the industry-standard 3300 XL series, the 7200-21508-02-12-10-02 integrates seamlessly with Bently Nevada’s 3300 XL 8 mm proximity transducers and monitoring systems (e.g., 3500/40M, 3500/22M). Its robust stainless-steel construction, gold-plated connector, and hermetically sealed sensing element ensure reliable performance in harsh plant environments. The probe’s optimized electromagnetic field geometry minimizes sensitivity to target material variations—supporting accurate measurements on standard carbon steel, 4140 alloy, and other common shaft materials without recalibration.

Detailed Specifications

• Model Number: 7200-21508-02-12-10-02
• Brand: Bently Nevada (Baker Hughes)
• Probe Type: 3300 XL 8 mm Non-Contact Eddy Current Proximity Probe
• Sensing Diameter: 8 mm nominal
• Linear Range: 2.0 mm (0.080 in) ±10% (calibrated per ASTM E2567)
• Output Sensitivity: 7.87 V/mm (200 mV/mil) typical
• Operating Temperature: –30 °C to +120 °C (–22 °F to +248 °F)
• Cable Length: 10 m (32.8 ft), integral coaxial cable with 3-conductor shielded design
• Connector: MIL-C-38999 Series III, gold-plated, hermetically sealed
• Target Material: Ferromagnetic metals (e.g., AISI 4140, 1045 steel); calibrated for standard shaft material
• IP Rating: IP67 (dust-tight and water-resistant)

Operational Capabilities

This proximity probe enables real-time, non-intrusive measurement of shaft displacement, axial position, differential expansion, and rotational speed—serving as a foundational sensor in condition monitoring and predictive maintenance strategies. Its low-noise output and high signal-to-noise ratio support integration into asset health platforms for early fault detection—including imbalance, misalignment, bearing wear, and rotor rub. The probe operates continuously with no moving parts or wear surfaces, delivering >10-year service life when installed per API RP 670 guidelines.

With its standardized 3300 XL interface, the 7200-21508-02-12-10-02 supports plug-and-play compatibility across legacy and modern Bently Nevada monitoring systems. It also complies with IEC 61000-6-2 (EMC immunity) and IEC 61000-6-4 (EMC emissions), ensuring stable operation in electrically noisy turbine halls and compressor stations.

Technical FAQ

Can this probe be used with non-Bently Nevada monitoring systems?

While optimized for Bently Nevada 3300 XL transducers and 3500-series monitors, the probe may interface with third-party systems that accept standard 8 mm eddy-current proximity signals—provided the system supports compatible sensitivity, output range, and excitation requirements. Engineering validation is recommended prior to integration.

What is the recommended calibration interval?

Bently Nevada recommends annual calibration for critical applications per ISO 18436-2. However, field verification using traceable shims and reference targets is advised every 6 months in high-vibration or high-temperature environments to ensure measurement integrity.

Is the probe suitable for hazardous area installations?

The 7200-21508-02-12-10-02 itself is not intrinsically safe or explosion-proof. For Class I Div 1/Zone 1 installations, it must be used in conjunction with an approved intrinsic safety barrier (e.g., 3300 XL IS Barrier) and certified system architecture per ATEX/IECEx requirements.

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