Bently Nevada 330500-06-02 Velomitor Sensor 100 mV/in/s

Bently Nevada 330500-06-02 Velomitor Piezo-velocity Sensor

Product Introduction

The 330500-06-02 is a high-performance Velomitor piezo-velocity sensor from Bently Nevada, designed for permanent vibration monitoring on compressors, turbines, pumps, and fans. This sensor provides a direct velocity output, eliminating the need for external integrators commonly required with accelerometers. Its rugged 316L stainless steel housing and hermetically-sealed connector ensure reliable operation in harsh industrial settings. Furthermore, the 330500-06-02 carries ATEX approval for hazardous areas, making it suitable for refineries, chemical plants, and offshore platforms. With a frequency response from 4.5 Hz to 5 kHz, it captures both low-speed and high-speed machine events effectively.

Key Electrical Specifications

First, let us examine the core performance parameters. The 330500-06-02 offers a sensitivity of 3.94 mV/mm/s (100 mV/in/s) with a tolerance of ±5%. This standardised output simplifies integration with most vibration monitoring systems. Additionally, its frequency response spans 4.5 Hz to 5 kHz (270 to 300,000 cpm) within ±3.0 dB, while a tighter ±0.9 dB window applies from 6.0 Hz to 2.5 kHz (360 to 150,000 cpm). Meanwhile, the velocity range reaches 1270 mm/s (50 in/s) peak, accommodating high-energy machinery. The amplitude linearity stays within ±2% up to 152 mm/s (6 in/s) peak, ensuring accurate readings across the measurement span.

Temperature Performance and Environmental Resilience

Temperature variations have minimal impact on this sensor. Specifically, its temperature sensitivity shifts between -14% and +7.5% across the full operating range of -55°C to 121°C (-67°F to 250°F). Such stability proves critical for outdoor installations or machinery with variable thermal loads. Moreover, the 330500-06-02 survives shocks up to 5,000 g peak, protecting it from sudden impacts or machinery trips. Its case is hermetically sealed, allowing operation in 100% relative humidity (non-submerged conditions). Additionally, the base strain sensitivity is only 0.005 in/s/mstrain, which minimises errors caused by mounting surface flexure.

Mechanical Construction and Mounting Details

The sensor body measures 25.3 mm (0.995 in) in diameter and 63.2 mm (2.49 in) in height, with a typical weight of 142 grams (5.0 oz). Its case material is 316L stainless steel, offering superior corrosion resistance compared to standard 304 grade. The connector features a 2-pin Mil-C-5015 type with a 316L stainless steel shell, also hermetically sealed to prevent moisture ingress. For installation, the 330500-06-02 uses a 5/8-18 UNF mounting thread, as indicated by the -06 suffix. Apply a mounting torque between 32-46 kg cm (24-40 in-lb) maximum to avoid damaging the housing or affecting measurement accuracy.

Signal Transmission and Cable Recommendations

This sensor outputs a dynamic signal with an impedance of less than 2400 Ω. The output bias voltage is -12 ±3.0 VDC referenced to Pin A. Additionally, the polarity is defined such that when the case moves toward the connector, Pin A becomes positive relative to Pin B. For optimal signal integrity, Bently Nevada recommends a maximum cable length of 305 metres (1,000 feet) using part number 02173006, with no signal degradation. Furthermore, for applications with high vibration levels (up to 50 g at 10 kHz) and cable capacitance of 200 pF/m, the recommended cable length is 208 feet (63 metres). This careful consideration of cable length preserves the sensor's dynamic accuracy.

Hazardous Area Approvals and Compliance

The 330500-06-02 carries the -02 agency approval option, which is ATEX certification for European hazardous areas. Specifically, it is rated Ex ia IIC T4 and AEx ia IIC T4 for Zone 0/1 installations, with a temperature class of T4 at ambient ranges from -40°C to 100°C. It also meets Class I, Division 1, Groups A, B, C, D; Class II, Groups E, F, G; and Class III requirements for North American Div 1 areas. For Division 2 applications, it is approved as Ex nL IIC T4 and AEx nA IIC T4. Additionally, this sensor complies with FCC Part 15, EMC Directive 2014/30/EU, RoHS Directive 2011/65/EU, and holds DNV marine and offshore certifications. Always install per drawing 167537 to maintain certification integrity.

Installation Best Practices

Proper mounting is essential for accurate measurements from your 330500-06-02. First, prepare a flat, clean mounting surface on the machine housing. Next, apply anti-seize compound to the 5/8-18 UNF threads if removal may be required later. Then, tighten the sensor to the specified torque of 32-46 kg cm (24-40 in-lb) using a calibrated torque wrench. Avoid over-tightening, as this could stress the internal piezoelectric element. Additionally, route the cable away from high-voltage sources or extreme heat to prevent signal interference. Finally, connect the 2-pin Mil-C-5015 connector securely, ensuring the pins align correctly with your extension cable.

Packaging and Logistics

Each new 330500-06-02 sensor arrives in original factory packaging, protecting it from physical damage during transit. The box contains the sensor unit only, with no mounting accessories or cables included. For your convenience, we ship all orders via FedEx, UPS, or DHL with full tracking capabilities. Please inspect the package upon arrival and report any visible damage immediately.

Frequently Asked Questions (FAQ)

1. Can I use the 330500-06-02 sensor in a submersible application?
No, the sensor is rated for 100% non-submerged humidity only. While the case is hermetically sealed, it is not designed for continuous immersion in liquids.

2. What is the difference between this Velomitor and a standard accelerometer?
A Velomitor directly outputs velocity signals, while an accelerometer outputs acceleration. The 330500-06-02 eliminates the need for an external integrator, simplifying system design and reducing potential integration errors.

3. Does the ATEX approval cover both gas and dust hazardous areas?
Yes, the 330500-06-02 covers gas groups (IIC) and dust groups (E, F, G) for Division 1 and Division 2 locations. Refer to the specific certification details for your zone classification.

4. How do I verify the sensor's health after installation?
Check the output bias voltage between Pin A and Pin B. It should read -12 ±3.0 VDC at room temperature. Significant deviations may indicate internal damage or connection issues.

5. Is the 330500-06-02 compatible with Bently Nevada 3500 monitoring systems?
Yes, it integrates seamlessly with Bently Nevada 3500 and other compatible velocity monitoring modules. Always confirm the input specifications of your monitor to match the 100 mV/in/s sensitivity.