330525-05 Bently Nevada Velomitor XA Piezo-velocity Sensor Module

Overview

The 330525-05 is a ruggedized piezo-velocity transducer engineered by Bently Nevada under the Velomitor XA (eXtended Application) series. Designed for harsh industrial environments, this sensor features a hermetically-sealed 316L stainless steel housing and a specialized weatherproof connector. It measures absolute casing vibration with high precision, eliminating the need for protective housings while meeting rigorous NEMA 4X and IP-65 ingress protection standards for critical machinery protection systems.

Part Number & Configuration Breakdown

• Base Model: 330525 (Velomitor XA Piezo-velocity Sensor Platform)
• Suffix Extension (-05): Designates agency approval configuration option 05 (SIRA/CENELEC hazardous area certification package).
• Brand: Bently Nevada
• Series: Velomitor XA
• Condition: New & Original in Factory Packing

Technical Specifications Matrix

1. Dynamic Performance & Sensitivity

• Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ± 5 %
• Frequency Response: 4.5 to 2,000 Hz (270 to 120,000 cpm) ± 3.0 dB; 6.0 to 1,000 Hz (360 to 60,000 cpm) ± 0.9 dB
• Velocity Range: 1270 mm/s (50 in/s) peak
• Amplitude Linearity: ± 2 % to 152 mm/s (6 in/s) peak
• Mounted Resonant Frequency: Greater than 12 kHz
• Transverse Sensitivity: Less than 5 % of sensitivity
• Broadband Noise Floor: Less than 0.004 mm/s (160 μin/s) rms nominal (4.5 Hz to 2 kHz)

2. Electrical & Power Parameters

• DC Voltage Supply: -22 to -30 V DC
• Bias Current: 2.5 to 6.0 mA
• Output Bias Voltage: -12 ± 3.0 V DC over temperature referenced to Pin A
• Dynamic Output Impedance: Less than 2400 Ω
• Polarity: Pin A goes positive relative to Pin B when case motion is toward the connector

3. Environmental & Mechanical Construction

• Operating & Storage Temperature: -55 °C to +121 °C (-67 °F to +250 °F)
• Shock Survivability: 5000 g peak maximum
• Relative Humidity: Up to 100 % non-submerged; hermetically sealed case
• Magnetic Field Susceptibility: < 51 μin/s/gauss (50 gauss, 50-60 Hz)
• Physical Dimensions: Diameter 28 mm (1.1 in); Height 73.1 mm (2.88 in)
• Net Weight: 156 g (5.5 oz) typical
• Case Material: 316L stainless steel
• Connector Type: 2-pin Mil-C-26482 hermetically sealed with 316L stainless steel shell

Installation & Wiring Guidelines

• Mounting Torque: 45 N·m (33 ft-lb) maximum on mounting stud to ensure high-frequency response integrity.
• Cable Specifications: Maximum cable length up to 305 meters (1,000 feet) using Bently Nevada part number 02173007 extension cable without signal degradation.
• Bend Radius: Maintain a 1.5-inch minimum bend radius on the mating cable assembly.
• Grounding: Case isolated design to eliminate ground loops in noisy electrical substations.

Hazardous Area Certifications

• Intrinsic Safety: Ex ia IIC T4; AEx ia IIC T4; Class I, Division 1, Groups A, B, C, D; Class II, Groups E, F, G; Class III (T4 at -40 °C ≤ Ta ≤ 100 °C)
• Non-Incendive / Energy Limited: Ex nL IIC T4; AEx nA IIC T4; Class I, Div 2, Groups A, B, C, D installed per drawing 167539 (T4 at -40 °C ≤ Ta ≤ 100 °C)

Diagnostic Capabilities & Fault Monitoring

• Bias Voltage Check: Monitoring the -12 V DC output bias voltage through the monitoring system channel provides immediate verification of transducer health and cabling continuity.
• Noise Floor Tracking: An elevated broadband noise floor (> 0.004 mm/s) often indicates physical cable friction, loose mounting torque, or severe electromagnetic interference.

Global PLC Spare HUB's Insight & Expert Guidance

Global PLC Spare HUB's Insight emphasizes that piezovelocity sensors require solid, flat mounting surfaces free of paint or corrosion. When mounting the 330525-05, applying a thin film of silicone grease or machine oil to the stud interface optimizes high-frequency transmissibility and prevents erroneous high-frequency roll-off.

Compatible Equipment & Target Application Scenarios

• Compatible Monitoring Systems: Bently Nevada 3500 Machinery Protection System, 3300 rack monitors, and compatible seismic vibration monitors.
• Target Applications: Heavy-duty gas and steam turbines, centrifugal and reciprocating compressors, large industrial pumps, cooling tower fans, and high-vibration gearboxes in hazardous chemical processing plants.

Logistics, Fulfillment & Warranty Protection

• Shipping Carriers: Express global dispatch via FedEx, UPS, and DHL.
• Fulfillment Speed: Guaranteed processing and dispatch within 24 to 48 hours.
• Warranty Terms: Fully backed by a 12-month factory replacement or repair warranty.

Professional Frequently Asked Questions

How can I verify if the 330525-05 sensor is functioning correctly during routine checks?

Measure the DC output bias voltage across Pin A and Pin B at the monitor input; a reading within the -9 V DC to -15 V DC window confirms internal amplifier integrity and proper loop power.

Can this velocity transducer be installed outdoors without a protective housing?

Yes, the hermetically-sealed 316L stainless steel body and weatherproof Mil-C-26482 connector comply with NEMA 4X and IP-65 ratings, allowing direct outdoor mounting in moist and corrosive atmospheres.

What precautions should be taken when running long extension cables?

Use the specified Bently Nevada shielded extension cable (part number 02173007) up to 305 meters, ensuring the shield is grounded at only one end to prevent ground loops and high-frequency noise injection.

What are the best selection guidelines when replacing older seismic sensors with this model?

Verify that your monitoring rack supplies constant current loop power between -22 V DC and -30 V DC with 2.5 to 6.0 mA bias current, and confirm the -05 SIRA/CENELEC hazardous approval matches your plant safety zone.

What causes sudden spikes or erratic high-frequency signals on the vibration readout?

Erratic spikes typically result from loose mechanical mounting torque below the 45 N·m specification, cable whipping due to inadequate clamps, or severe electrical transients exceeding standard shielding limits.

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