Bently Nevada 330525-10 Velomitor XA Piezo-Velocity Sensor

The Bently Nevada 330525-10 is an industrial-grade, case-isolated Velomitor XA (Extended Application) piezo-velocity sensor. Unlike standard proximity systems that measure relative shaft displacement, this sensor directly gauges the absolute structural vibration velocity of casing or housing components on high-performance rotating assets.

Hardware Specifications

Signal Analytics and Frequency Bounds

The 330525-10 relies on an internal piezoelectric crystal integrated with an embedded charge-amplifier matrix to compute casing velocity while filtering out electrostatic noise.

• Frequency Spectrum: Operates within a flat processing passband from 4.5 Hz to 2,000 Hz (±3 dB bounds).
• Resonant Peak Boundaries: Features a physical mounted resonance threshold exceeding 12 kHz, preventing signal amplification at standard industrial machine operating speeds.
• Transverse Response Limitations: Cross-axis cross-talk is mechanically choked to less than 5%, isolating precise directional vectors during complex multi-axial failures.
• Dynamic Range Limits: Capable of tracking peak velocity anomalies up to 1,270 mm/s (50 in/s).

Frequently Asked Questions

Q: What installation configuration does the “-10” option suffix specify? A: The “-10” suffix specifies a 1/2-20 UNF (Unified Fine Thread) mounting stud configuration, providing high clamping torque directly to the machine’s tapped casing.

Q: Does this sensor require an external Proximitor driver module? A: No. Unlike eddy-current displacement probes, the Velomitor XA incorporates internal electronic amplification. It interfaces directly with standard Bently Nevada 3500 monitoring racks (such as the 3500/42M monitor) or external distributed control systems (DCS) using standard two-wire constant-current cabling loops.

Field Installation Guidelines

• Surface Planarity Prep: Ensure the machinery mounting footprint is machined flat to a surface finish of at least 0.8 µm Ra, and torque the sensor exactly to 11.3 N·m (100 in·lb) to guarantee linear high-frequency energy transfer.
• Case Ground Separation: Keep the internal signal common floating and isolated from the outer 316L stainless steel shell to eliminate structural ground loops.
• Shield Continuity Routing: Terminate the external cable shield braid only at the monitoring rack chassis ground. Do not ground the shield at the sensor end.