330500-05-04 Bently Nevada Velomitor Piezo-velocity Sensor

Product Introduction

The Bently Nevada 330500-05-04 delivers reliable absolute vibration measurement. This Velomitor Piezo-velocity Sensor converts case velocity into a proportional electrical signal. It offers a direct replacement for traditional velocity transducers with improved performance. Moreover, its piezoelectric design ensures wide frequency response and excellent stability. The sensor is manufactured in the U.S.A. to meet rigorous quality standards.

Specifically, the 330500-05-04 features a sensitivity of 3.94 mV/mm/s (100 mV/in/s) with ±5% tolerance. This consistent output simplifies system calibration. Furthermore, the sensor incorporates case isolation to prevent ground loop issues. Its hermetically-sealed construction protects against moisture and contamination. This model carries extensive hazardous area approvals, making it suitable for demanding environments.

Technical Specifications

Performance Characteristics

The 330500-05-04 Velomitor offers impressive performance across various parameters. Its frequency response spans 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) at ±3.0 dB. Additionally, a tighter response of 6.0 Hz to 2.5 kHz (360 cpm to 150 kcpm) at ±0.9 dB is available. The velocity range reaches 1270 mm/s (50 in/s) peak. Amplitude linearity is within ±2% up to 152 mm/s (6 in/s) peak. The mounted resonant frequency exceeds 12 kHz. Consequently, this sensor captures a broad spectrum of machine vibrations effectively.

Electrical Specifications

The electrical output is characterized by specific parameters. The output bias voltage is -12 ±3.0 VDC, referenced to Pin A over temperature. Dynamic output impedance is less than 2400 Ω. The broadband noise floor, measured from 4.5 Hz to 5 kHz, is 0.004 mm/s (160 μin/s) rms nominal. This low noise floor ensures clear signal transmission. Furthermore, the maximum cable length reaches 305 metres (1,000 feet) with specified cable (part number 02173006) without signal degradation. Polarity is defined: when the case moves toward the connector, Pin A becomes positive relative to Pin B.

Environmental and Physical

This sensor operates under extreme environmental conditions. The operating temperature range is -55°C to 121°C (-67°F to 250°F). Shock survivability is rated at 5,000 g peak maximum. Relative humidity tolerance reaches 100% non-submerged, as the case is hermetically-sealed. Base strain sensitivity is 0.005 in/s/mstrain. Magnetic field susceptibility is less than 51 min/s/gauss (50 gauss, 50-60Hz). Physically, the sensor weighs 142 grams (5.0 oz) typical. Diameter measures 25.3 mm (0.995 in), and height is 63.2 mm (2.49 in). The case material is 316L stainless steel for corrosion resistance.

Agency Approvals and Certifications

The Bently Nevada 330500-05-04 holds multiple approvals for global use. For hazardous areas, it carries Ex ia IIC T4 and AEx ia IIC T4 certifications. It is approved for Class I, Division 1, Groups A, B, C, and D. Additionally, it covers Class II, Groups E, F, G, and Class III. The T4 rating applies from -40°C ≤ Ta ≤ 100°C. It also holds Ex nL IIC T4 and AEx nA IIC T4 for Class I, Div 2, Groups A, B, C, D. Furthermore, it complies with FCC Part 15 rules. It meets EMC Directive 2014/30/EU and RoHS Directive 2011/65/EU. Maritime approvals include DNV rules for ships, high-speed craft, and offshore standards.

Installation Guidelines

Proper installation of the 330500-05-04 Velomitor ensures optimal performance. First, select the appropriate mounting thread. Note that this model uses a specific thread option. For 1/4-18 NPT mounting, order the 330525 instead. Apply mounting torque between 32-46 kg cm (24-40 in-lb) maximum. This range ensures secure attachment without damaging the sensor. Next, verify the recommended cable length. Assuming maximum vibration of 50g at 10 kHz and cable capacitance of 200 pf/m, the recommended length is 208 ft (63m). Finally, observe the polarity: pin A is positive when motion is toward the connector.

Packaging List

The product package includes the following items:

• Bently Nevada 330500-05-04 Velomitor Piezo-velocity Sensor (1 unit)

• Installation and wiring instruction sheet

Please note: Mounting hardware, cables, connectors, and certificates are not included and must be purchased separately.

Frequently Asked Questions (FAQ)

1. What is the sensitivity of the 330500-05-04 Velomitor?
The Bently Nevada 330500-05-04 has a sensitivity of 3.94 mV/mm/s, which is equivalent to 100 mV/in/s, with a tolerance of ±5%.

2. What hazardous area approvals does this sensor carry?
This sensor holds Ex ia IIC T4 and AEx ia IIC T4 for Zone 1/Division 1, plus Ex nL IIC T4 and AEx nA IIC T4 for Zone 2/Division 2. It also has DNV maritime approvals.

3. What is the operating temperature range for this device?
The 330500-05-04 operates reliably from -55°C to 121°C (-67°F to 250°F), making it suitable for extreme environments.

4. What is the maximum cable length for this sensor?
The maximum cable length is 305 metres (1,000 feet) using Bently Nevada cable part number 02173006, with no signal degradation.

5. Is the sensor case grounded or isolated?
The 330500-05-04 features a case-isolated design. This prevents ground loop problems and improves signal integrity.