Bently Nevada 330500-02-02 Velomitor Piezo-velocity Sensor

Product Introduction

The Bently Nevada 330500-02-02 is a high-performance Velomitor Piezo-velocity Sensor designed for reliable machine condition monitoring. This sensor converts mechanical vibration into a proportional electrical signal, making it ideal for pumps, compressors, turbines, and fans. Its piezo-velocity technology provides a direct velocity output without requiring an external integrator.

Specifically, this model features an M8 x 1 mounting thread and ATEX European approval (suffix -02) for hazardous area installations. The sensor operates across a wide temperature range from -55°C to 121°C (-67°F to 250°F). Moreover, its hermetically-sealed 316L stainless steel case ensures durability in wet, dusty, or corrosive environments. Each unit is manufactured in the U.S.A. and ships in original factory packaging.

Technical Specifications

The 330500-02-02 offers accurate velocity measurement across a broad frequency spectrum. Its electrical sensitivity is rated at 3.94 mV/mm/s (100 mV/in/s) ±5% at 100 Hz. The frequency response spans from 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) with ±3.0 dB tolerance, while the narrower band of 6.0 Hz to 2.5 kHz (360 cpm to 150 kcpm) achieves ±0.9 dB precision.

Key electrical parameters:

• Velocity range: 1270 mm/s (50 in/s) peak

• Output bias voltage: -12 ±3.0 VDC referenced to Pin A

• Dynamic output impedance: Less than 2400 Ω

• Broadband noise floor (4.5 Hz to 5 kHz): 0.004 mm/s rms nominal

• Amplitude linearity: ±2% to 152 mm/s (6 in/s) peak

• Transverse sensitivity: Less than 5% of sensitivity

The sensor's mounted resonant frequency exceeds 12 kHz, ensuring accurate readings well above typical machine vibration frequencies. Temperature sensitivity varies from -14% to +7.5% typical over the full operating range, which remains within acceptable limits for industrial monitoring.

Mechanical and Environmental Ratings

This Velomitor Piezo-velocity Sensor is built for extreme conditions. The 316L stainless steel case measures 25.3 mm (0.995 in) in diameter and 63.2 mm (2.49 in) in height. It weighs approximately 142 grams (5.0 oz). The 2-pin Mil-C-5015 connector features a hermetically-sealed 316L stainless steel shell for maximum environmental protection.

Environmental limits:

• Operating temperature: -55°C to 121°C (-67°F to 250°F)

• Shock survivability: 5,000 g peak maximum

• Relative humidity: Up to 100% non-submerged (case is hermetically-sealed)

Furthermore, the sensor offers excellent immunity to interference. Base strain sensitivity is rated at 0.005 in/s/mstrain. Magnetic field susceptibility measures less than 51 min/s/gauss at 50 gauss, 50-60Hz. The case is isolated from ground, preventing ground loop issues in many installations.

Hazardous Area Approvals and Certifications

The 330500-02-02 carries multiple hazardous area approvals, making it suitable for use in explosive atmospheres. Its ATEX certification (European) covers:

• Ex ia IIC T4 and AEx ia IIC T4 (intrinsic safety)

• Class I, Division 1, Groups A, B, C and D

• Class II, Groups E, F, G

• Class III

• Ex nL IIC T4 and AEx nA IIC T4 (non-incendive)

• Class I, Div 2, Groups A, B, C, D

Temperature classification is T4 for ambient temperatures from -40°C to 100°C. Additionally, the sensor complies with FCC Part 15, EMC Directive 2014/30/EU, and RoHS Directive 2011/65/EU. Maritime approvals from DNV cover ships, high-speed craft, and offshore standards.

Installation Guidelines

Installing the Bently Nevada 330500-02-02 requires proper torque and cable selection. Mount the sensor using the M8 x 1 thread with a maximum torque of 32-46 kg cm (24-40 in-lb). Exceeding this torque may damage the sensor or affect its performance.

For the cable, use part number 02173006 or equivalent 2-conductor shielded cable. The maximum cable length is 305 meters (1,000 feet) without signal degradation. However, for installations with high vibration (50g at 10 kHz) and cable capacitance of 200 pF/m, the recommended length is 208 feet (63 meters). Always observe polarity: when the sensor case moves toward the connector, Pin A becomes positive with respect to Pin B.

Packaging List

Each new original 330500-02-02 unit comes in factory-sealed packaging. The box contains:

• 1 x Velomitor Piezo-velocity Sensor (M8 x 1 thread, ATEX approved)

• 1 x Mounting instruction sheet

Note: Certificates and warranty documents are not included in the package.

Shipping Information

All orders ship via FedEx, UPS, or DHL with full tracking. International delivery typically takes 3–7 business days. Expedited shipping options are available upon request.

Frequently Asked Questions

1. What type of machines is this sensor suitable for?
The 330500-02-02 works well with pumps, compressors, turbines, fans, motors, and other rotating machinery requiring velocity-based vibration monitoring.

2. Can I use this sensor without an external integrator?
Yes. The Velomitor sensor outputs velocity directly, eliminating the need for an integrator. This simplifies installation and reduces potential signal processing errors.

3. What does the ATEX approval allow?
The -02 suffix provides ATEX certification for Zone 0, 1, and 2 hazardous areas. It covers both intrinsic safety (Ex ia) and non-incendive (Ex nL) protection methods.

4. How do I verify correct polarity during installation?
Connect Pin A to the positive input of your monitor and Pin B to the negative (or common). When the sensor case moves toward the connector, Pin A becomes positive relative to Pin B.

5. Is the sensor suitable for underwater or submerged applications?
No. While the case is hermetically-sealed and handles 100% humidity, it is not designed for continuous submersion. Use it in non-submerged environments only.