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

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

Product Introduction

The Bently Nevada 330500-02-04 belongs to the Velomitor series of piezo-velocity sensors. This device measures absolute case vibration velocity on rotating machinery, providing a direct 100 mV/in/s output. Additionally, it features an M8 x 1 mounting thread and a 316L stainless steel, hermetically-sealed case for superior environmental protection.

This sensor offers a frequency response from 4.5 Hz to 5 kHz and a velocity range of 1270 mm/s (50 in/s) peak. Furthermore, it carries multiple hazardous area approvals, including CSA and ATEX certifications. The Velomitor Piezo-velocity Sensor is an ideal solution for machinery protection and condition monitoring in oil and gas, power generation, and marine applications.

Technical Specifications

This section details the core technical parameters of the 330500-02-04 sensor. The suffix codes precisely define its configuration for accurate ordering.

• Mounting Thread Option: M8 x 1 (Suffix 02).

• Agency Approval: Multiple approvals (CSA, ATEX) (Suffix 04).

• Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ±5%.

• Frequency Response: 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) ±3.0 dB; 6.0 Hz to 2.5 kHz (360 cpm to 150 kcpm) ±0.9 dB.

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

• Transverse Sensitivity: Less than 5% of sensitivity.

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

• Mounted Resonant Frequency: Greater than 12 kHz.

• Output Bias Voltage: -12 ±3.0 VDC.

• Dynamic Output Impedance: Less than 2400 Ω.

• Broadband Noise Floor: 0.004 mm/s (160 μin/s) rms, nominal.

• Maximum Cable Length: 305 metres (1,000 feet) with no signal degradation.

Mechanical and Environmental Parameters

The Velomitor Piezo-velocity Sensor features a robust mechanical design for extreme industrial conditions. The case material is 316L stainless steel, providing excellent corrosion resistance. The connector is a 2-pin Mil-C-5015 hermetically-sealed type with a 316L stainless steel shell, ensuring reliable electrical connections even in wet environments.

For temperature performance, the sensor operates from -55°C to 121°C (-67°F to 250°F). The case is hermetically-sealed and withstands 100% relative humidity when non-submerged. Additionally, the sensor survives shock loads up to 5,000 g peak. The recommended mounting torque ranges from 32-46 kg cm (24-40 in-lb) maximum.

Electrical Characteristics

The Bently Nevada 330500 sensor offers excellent electrical performance for accurate vibration measurements. The output bias voltage is -12 ±3.0 VDC over temperature, referenced to Pin A. The dynamic output impedance is less than 2400 Ω, allowing for long cable runs without signal degradation.

Furthermore, the sensor features case isolation for ground loop prevention. The maximum cable length is 305 metres (1,000 feet) using part number 02173006 cable with no signal degradation. However, for optimal performance with high vibration levels (50g at 10 kHz), the recommended cable length is 63 metres (208 ft) assuming a cable capacitance of 200 pf/m.

Hazardous Area Approvals

The 330500-02-04 Velomitor carries multiple hazardous area approvals for global deployment. For intrinsically safe installations, the sensor is certified Ex ia IIC T4 and AEx ia IIC T4. It is suitable for Class I, Division 1, Groups A, B, C, and D, as well as Class II, Groups E, F, G, and Class III installations.

For non-incendive installations, the sensor carries Ex nL IIC T4 and AEx nA IIC T4 approvals. It is suitable for Class I, Division 2, Groups A, B, C, and D. The temperature rating is T4 @ -40°C ≤ Ta ≤ 100°C for both approval types. Consequently, the Velomitor Piezo-velocity Sensor provides flexibility for installation in virtually any hazardous area environment.

Key Features and Benefits

The Velomitor Piezo-velocity Sensor offers several distinct advantages for vibration monitoring applications. First, the piezo-velocity technology provides a direct velocity output without requiring integration of acceleration signals. This simplifies the measurement chain and reduces signal processing errors.

In addition, the hermetically-sealed 316L stainless steel construction ensures long-term reliability in harsh environments. The case is fully sealed against moisture and contaminants. Meanwhile, the case-isolated design prevents ground loops, simplifying installation and improving signal quality. Furthermore, the wide frequency response (4.5 Hz to 5 kHz) covers most machinery vibration frequencies, from slow-speed turbines to high-speed compressors.

Installation Guidelines

Proper installation is essential for achieving optimal performance from the 330500-02-04 sensor.

First, select a mounting location on the machine casing that provides good vibration transmission. The mounting surface should be clean, flat, and free from burrs. Next, drill and tap the mounting hole to M8 x 1 specifications. Then, apply a thin layer of anti-seize compound to the mounting threads to prevent galling.

After that, tighten the sensor to the recommended torque of 32-46 kg cm (24-40 in-lb). Do not exceed the maximum torque to avoid damaging the sensor. Then, connect the 2-pin Mil-C-5015 connector to the extension cable, ensuring proper polarity. When the sensor case moves toward the connector, Pin A becomes positive with respect to Pin B. Finally, route the cable away from high-temperature surfaces and sources of electrical interference.

Packaging List

The 330500-02-04 unit is shipped new and original in factory packaging. The package contains the following items:

• 1 x Bently Nevada 330500 Velomitor Piezo-velocity Sensor (M8 x 1 thread).

• 1 x 2-pin Mil-C-5015 connector (installed on sensor).

• 1 x Installation instruction sheet.

Frequently Asked Questions (FAQ)

1. What is the difference between a piezo-velocity sensor and an accelerometer?
A piezo-velocity sensor provides a direct velocity output (mV/in/s), while an accelerometer provides an acceleration output. Therefore, the Velomitor sensor eliminates the need for integration circuits to obtain velocity, simplifying the measurement chain.

2. What hazardous area approvals does the 330500-02-04 carry?
This model carries multiple approvals, including CSA and ATEX certifications. It is approved for Ex ia IIC T4 (intrinsically safe) and Ex nL IIC T4 (non-incendive) installations, making it suitable for most hazardous area applications.

3. What is the maximum cable length I can use with this sensor?
The maximum cable length is 305 metres (1,000 feet) using part number 02173006 cable. However, for high vibration levels (50g at 10 kHz), the recommended cable length is 63 metres (208 ft) to maintain signal integrity.

4. What shipping methods do you use for this item?
We ship this product using major international couriers. The shipping methods are typically Fedex, UPS, or DHL to ensure fast and reliable delivery worldwide.

5. Is this sensor case isolated or grounded?
The 330500 Velomitor features case isolation for ground loop prevention. This design simplifies installation and improves signal quality by eliminating potential ground loop issues with the monitoring system.