Bently Nevada 330500-04-01 Velomitor Piezo-Velocity Sensor

Bently Nevada 330500 Velomitor Piezo-Velocity Sensor

Industrial-grade piezoelectric velocity sensor engineered for absolute vibration measurement on machinery casings and structures. The Bently Nevada 330500-04-01 delivers direct velocity output without integration or differentiation, providing accurate vibration data for condition monitoring and machinery protection applications.

🔍 Product Specifications

Model Number: 330500-04-01
Sensor Type: Piezoelectric velocity transducer
Product Family: Velomitor Series
Measurement Output: Velocity (mm/s or in/s RMS)
Frequency Range: 10 Hz to 1000 Hz (-3 dB)
Sensitivity: 100 mV/(in/s) typical [4 mV/(mm/s)]
Measurement Range: 0 to 2.0 in/s (0 to 50 mm/s) RMS
Mounting Type: Stud mount (M10 or 1/4-28 UNF)
Housing Material: Stainless steel (316L)
Electrical Connection: Integral cable or top connector
Operating Temperature: -50°C to +120°C (-58°F to +248°F)
Environmental Rating: IP67 sealed construction
Compliance: ISO 10816, API 670, CE certified

🎯 Piezoelectric Velocity Measurement

Unlike accelerometers that require electronic integration or proximity probes that measure relative shaft motion, the Velomitor sensor directly outputs velocity—the parameter most commonly specified in machinery vibration standards like ISO 10816 and API 670. This eliminates signal processing complexity and provides measurements that directly correlate with vibration severity criteria.

The piezoelectric sensing element generates an electrical charge proportional to mechanical stress induced by vibration. Internal electronics convert this charge into a low-impedance voltage output that can drive long cable runs to monitoring systems without signal degradation or noise pickup.

🏭 Strategic Application Areas

Casing Vibration Monitoring: Mount sensors on bearing housings, gearbox casings, and motor frames to measure absolute vibration levels. Ideal for machines where shaft access is limited or where casing vibration is the primary concern—such as electric motors, fans, and pumps.

Structural Health Monitoring: Install on foundations, pedestals, and support structures to detect looseness, resonance, or structural degradation that manifests as abnormal vibration transmission patterns.

Balance Quality Verification: Use during balancing operations to measure vibration reduction as correction weights are applied. The direct velocity output simplifies comparison against ISO 1940 balance quality grades.

Machinery Acceptance Testing: Verify new equipment meets vibration specifications before acceptance. The sensor's wide frequency range captures both low-speed imbalance and high-frequency bearing defects in a single measurement.

⚙️ Performance Characteristics

✓ Self-Generating: No external power required (passive sensor)
✓ Ground Loop Immune: Isolated output eliminates ground-related noise
✓ Wide Dynamic Range: Measures from low background levels to trip thresholds
✓ Temperature Stable: Maintains accuracy across industrial temperature range
✓ Hermetically Sealed: Withstands moisture, oil, and chemical exposure

💼 Installation and Integration

The 330500-04-01 mounts directly to machinery surfaces using a threaded stud connection. Proper mounting is critical—use a flat, smooth mounting surface with adequate thread engagement. Apply mounting torque per manufacturer specifications to ensure good mechanical coupling and measurement accuracy.

The sensor's low-impedance output connects directly to Bently Nevada monitors (3300 or 3500 series), PLCs, DCS systems, or portable vibration analyzers. Standard coaxial cable runs up to 300 meters are supported without signal conditioning or amplification.

🔧 Maintenance Advantages

Velomitor sensors require minimal maintenance—no moving parts, no calibration drift, and no consumables. The rugged stainless steel construction withstands harsh industrial environments including high temperatures, corrosive atmospheres, and mechanical shock. Expected service life exceeds 20 years in typical applications.

The sensor's self-diagnostic capability allows monitoring systems to detect cable faults, open circuits, and sensor failures automatically, ensuring measurement integrity and reducing false alarms.

📦 Complete Package

One Bently Nevada 330500-04-01 Velomitor piezo-velocity sensor, mounting stud and hardware, calibration certificate with traceability, installation instructions, and technical data sheet. Compatible with all Bently Nevada monitoring systems and third-party vibration analyzers.

Product Status: Brand new, factory-sealed unit with full manufacturer warranty and global technical support.