Product Overview

The Bently Nevada 21504-000-016-10-02 represents the gold standard in non-contacting displacement and vibration measurement for rotating machinery. As a core component of the 3300 XL 5mm Proximity Transducer System, this probe excels in confined spaces where standard 8mm probes cannot fit. It delivers high-frequency response and superior linear range, ensuring critical assets like high-speed turbines, compressors, and pumps remain within safe operational limits. Engineered for seamless integration with Bently Nevada 3500 and 3300 monitoring racks, this transducer provides the precise "gap" voltage required for real-time radial vibration and axial position monitoring, effectively preventing catastrophic mechanical failures through early detection of shaft instability.

Decoding the Part Number Configurator

Understanding the specific suffix options for the 21504 series ensures correct mechanical fit and electrical impedance matching.

000 (Unthreaded Length Option): This indicates a standard configuration without specialized unthreaded lengths, typically used in standard bracket mounting.

016 (Overall Case Length Option): Specifies a total case length of 1.6 inches. This dimension is critical for ensuring the probe tip reaches the target surface while maintaining structural rigidity.

10 (Total Length Option): Represents a 1.0-meter total cable length. For reliable signal integrity, this must match the calibration of the associated Proximitor Sensor.

02 (Connector and Agency Approval Option): Includes a miniature coaxial connector with standard brass construction and North American/International hazardous area approvals.

Critical Engineering Parameters

Precision Installation Protocols

Proper installation dictates the accuracy of your Vibration Monitoring System (VMS). Ensure the probe is gapped using a digital multimeter to measure the DC output voltage from the Proximitor Sensor. For most 3300 XL 5mm systems, the standard bias is -10.0 VDC at the center of the linear range.

Avoid tight bends in the coaxial cable; maintain a minimum bend radius of 25.4 mm (1 inch) to prevent signal attenuation or physical fatigue. Always utilize a side-exit or specialized housing if the installation environment exposes the cable to mechanical shearing. Verify that the target material is AISI 4140 steel; other materials require specific scale factor adjustments in the monitoring software.

Industrial Performance Advantages

The 21504 series thrives in the most demanding industrial environments. Its 5mm tip diameter provides an exceptional solution for small-diameter shafts or fluid-film bearings where spatial constraints are tight. The 3300 XL technology significantly reduces "cross-talk" and electromagnetic interference, providing a clean signal to the DCS (Distributed Control System) or PLC. Its robust design resists chemical corrosion and high-pressure lubricants, ensuring the Turbine Supervisory Instrumentation (TSI) remains online during critical startup and shutdown phases.

Logistics and Packaging

Delivery time: 3-5 days when payment finish, BY DHL/FEDEX/UPS.

Every unit ships in original Bently Nevada anti-static industrial packaging to protect the sensitive internal sensor coil and ensure calibration stability during transit.

Technical Consultation (FAQ)

Q1: Can I use this 5mm probe with a standard 8mm Proximitor?

A1: No. The electrical characteristics and scale factors differ. A 5mm probe must be paired with a dedicated 3300 XL 5mm Proximitor Sensor to ensure the 200 mV/mil sensitivity is accurate.

Q2: What should I do if the shaft material is not 4140 steel?

A2: You must perform a manual calibration or "gold-standard" verification. Different alloys change the magnetic permeability, which affects the voltage output. Contact engineering for a custom scale factor.

Q3: Is the 21504-000-016-10-02 suitable for underwater applications?

A3: While the probe tip is sealed, the connection between the probe cable and extension cable must be protected by a fluid-tight connector protector or housing to maintain signal integrity in submerged or high-humidity conditions.