330505-03-02-04 Bently Nevada Low Frequency Velocity Sensor

Technical Profile: Precision Low-Frequency Seismic Monitoring

• The 330505-03-02-04 is a high-performance seismic velocity transducer engineered for slow-rotating machinery.
• Unlike standard accelerometers, the 330505-03-02-04 provides a superior signal-to-noise ratio down to 0.5 Hz.
• It facilitates the early detection of structural resonance and bearing defects in heavy industrial equipment.
• The hermetically sealed 300-series stainless steel housing ensures long-term stability in 100% humidity.

Configuration Hierarchy & Breakdown

• Base Model: 330505 (Low Frequency Velocity Sensor)
•     └── Option -03: Transducer Mounting Angle
•         └── Orientation: 180° ± 10° (Specific vertical downward installation)
•     └── Option -02: Internal Mounting Thread
•         └── Specification: 3/8-24 UNF-2B (High-torque industrial thread)
•     └── Option -04: Mounting Adapter
•         └── Hardware: 1/4 - 20 UNC (Versatile surface interface)

Global PLC Spare HUB's Insight

• The 330505-03-02-04 is a critical asset for Hydro-power and large industrial pumping applications.
• Engineers select this -03 variant because it is factory-optimized for inverted mounting to maintain mass centering.
• The 20 mV/mm/s sensitivity provides a "clean" velocity signal, bypassing the integration errors of standard accelerometers.
• It is the definitive choice for structural health monitoring when paired with 3500/46M Hydro Monitor racks.

Detailed Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)
• Model Number: 330505-03-02-04
• Sensitivity: 20 mV/mm/s (508 mV/in/s) ±10%
• Frequency Range: 0.5 Hz to 1000 Hz (30 to 60,000 cpm)
• Velocity Range Peak: 102 mm/s (4 in/s)
• Output Bias Voltage: -12 ±1 VDC
• Amplitude Linearity: ±3% up to 102 mm/s
• Case Material: 300 Series Stainless Steel
• Connector: 2-pin Mil-C-5015 (Hermetically Sealed)
• Shock Survivability: 981 m/s² (100g) Peak
• Operating Temp: -40 degrees Celsius to +100 degrees Celsius

Diagnostic Capabilities & Application Scenarios

• Bias Voltage Tracking: The -12 VDC bias allows for continuous health monitoring; shifts indicate cabling or mass damage.
• Low-Frequency Accuracy: Provides ±0.9 dB accuracy in the critical 1—200 Hz range for machinery balancing.
• Hydro-Electric Turbines: Monitors slow-speed shaft vibration and stator frame movement accurately.
• Reciprocating Compressors: Ideal for crosshead vibration monitoring where low-frequency components prevail.

Logistics & Warranty Terms

• Condition: Brand New & Original in Factory Packing.
• Express Logistics: Global priority delivery via FedEx, UPS, and DHL.
• Dispatch Window: Shipment confirmed and processed within 24-48 hours.
• Warranty Policy: Secured by a comprehensive 12-month factory-grade warranty.

Professional FAQ & Selection Guide

• Can I mount the 330505-03-02-04 at any angle?
• No. The -03 suffix specifies a 180° ± 10° mounting angle. Improper orientation causes incorrect bias and poor response.


• What is the benefit of the Mil-C-5015 connector?
• This industry standard provides a rugged, vibration-proof, and hermetically sealed connection in harsh environments.


• Is an external amplifier required for long cable runs?
• No. The 330505-03-02-04 drives up to 305 meters of cable directly when used with 3500/46M monitors.


• Selection Guide: Why choose the 330505 over a standard accelerometer?
• Standard sensors lose sensitivity below 5 Hz. The 330505-03-02-04 is purpose-built to maintain accuracy at 0.5 Hz.


• Experience Tip: How do I verify a faulty sensor in the field?
• Measure the DC bias between Pin A and Pin B. If the voltage deviates from -12 VDC, the sensor or cable is likely damaged.

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