Bently Nevada 330500-04-02 Velomitor Piezo-velocity Sensor

Bently Nevada 330500-04-02 Velomitor Piezo-velocity Sensor

Precision Vibration Monitoring for Critical Machinery

The Bently Nevada 330500-04-02 Velomitor piezo-velocity sensor represents a trusted solution for permanent machine vibration monitoring. Specifically, this sensor converts mechanical velocity into an electrical signal proportional to the vibration level. Therefore, it plays an essential role in predictive maintenance and machinery protection systems across various industries.

Electrical Performance and Sensitivity

First, the 330500-04-02 offers a sensitivity of 3.94 mV/mm/s (100 mV/in/s) with a ±5% tolerance. Additionally, its frequency response spans from 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) at ±3.0 dB, while a tighter ±0.9 dB response is available from 6.0 Hz to 2.5 kHz (360 cpm to 150 kcpm). Meanwhile, the velocity range reaches 1270 mm/s (50 in/s) peak, accommodating high-amplitude measurements. Furthermore, amplitude linearity remains within ±2% up to 152 mm/s (6 in/s) peak, ensuring accurate readings across the operating range.

The output bias voltage is -12 ±3.0 VDC referenced to Pin A, with a dynamic output impedance below 2400 Ω. Moreover, the broadband noise floor (4.5 Hz to 5 kHz) is only 0.004 mm/s (160 μin/s) rms, which guarantees clean signal quality even in low-vibration scenarios.

Environmental Durability and Mechanical Construction

The Bently Nevada 330500 sensor operates reliably across an extreme temperature range of -55°C to 121°C (-67°F to 250°F). Besides that, it withstands shock survivability up to 5,000 g peak and 100% relative humidity in non-submerged conditions, thanks to its hermetically-sealed case. The case material is 316L stainless steel, offering excellent corrosion resistance for harsh industrial settings.

Physically, the sensor weighs only 142 grams (5.0 oz) and measures 25.3 mm in diameter with a height of 63.2 mm. Its 2-pin Mil-C-5015 connector also features a 316L stainless steel shell for added durability. For installation, the recommended mounting torque ranges from 32-46 kg cm (24-40 in-lb).

Hazardous Area Approvals and Compliance

Notably, the 330500-04-02 model includes the -02 ATEX (European) agency approval option. Consequently, it carries multiple hazardous area certifications:

• Ex ia IIC T4 and AEx ia IIC T4 for Class I, Division 1, Groups A, B, C, D

• Also approved for Class II, Groups E, F, G and Class III

• Additionally, Ex nL IIC T4 and AEx nA IIC T4 for Class I, Division 2, Groups A, B, C, D

• Temperature class T4 from -40°C to 100°C ambient

Furthermore, this sensor complies with FCC Part 15, EMC Directive 2014/30/EU, RoHS Directive 2011/65/EU, and DNV maritime classifications for ships, high-speed craft, and offshore standards.

Installation and Wiring Considerations

For optimal signal integrity, the maximum recommended cable length is 305 metres (1,000 feet) using part number 02173006 without signal degradation. However, for high-frequency applications (50g vibration at 10 kHz with 200 pf/m cable capacitance), the recommended length reduces to 63 metres (208 feet). Additionally, the case is electrically isolated from ground, and transverse sensitivity remains below 5% of the main sensitivity.

Packaging and Shipping Information

Your shipment includes the following items:

• One Bently Nevada 330500-04-02 Velomitor piezo-velocity sensor

• Protective packaging for safe transport

• Quick-reference installation card

Moreover, we ship all orders via trusted carriers such as FedEx, UPS, or DHL. Consequently, you can expect reliable and trackable delivery to your facility worldwide.

Frequently Asked Questions (FAQ)

1. What does the -04 mounting thread option mean for the 330500 sensor?
   The -04 option indicates a 1/4-20 UNC mounting thread, which is standard for many industrial mounting applications.

2. Can the 330500-04-02 be used in explosive atmospheres?
   Yes, the -02 agency approval option provides ATEX certification for both Division 1 and Division 2 hazardous areas.

3. What is the operating temperature range for this velocity sensor?
   It operates from -55°C to 121°C (-67°F to 250°F), making it suitable for extreme thermal environments.

4. How do I determine the correct cable length for my installation?
   Standard installations support up to 305 metres, but for high-frequency, high-g applications, reduce length to 63 metres as specified.

5. Is the Bently Nevada 330500 sensor case grounded or isolated?
   The case is isolated from ground, which helps prevent ground loop issues in monitoring systems.