Bently Nevada 330500-04-00 Velomitor Piezo-Velocity Sensor

Bently Nevada 330500-04-00 Velomitor Sensor

Product Introduction

The Bently Nevada 330500-04-00 is a high-performance Velomitor piezo-velocity sensor for precise vibration measurement in rotating machinery. This model features a 1/4-20 UNC mounting thread and delivers a stable sensitivity of 3.94 mV/mm/s (100 mV/in/s) ±5% . Its frequency response spans 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) ±3.0 dB, suiting a broad range of monitoring applications. Additionally, the sensor shows a low transverse sensitivity of less than 5%, which minimizes cross-axis errors effectively. For instance, its amplitude linearity remains within ±2% to 152 mm/s (6 in/s) peak, providing a wide dynamic range for real-world signals.

This sensor operates reliably across extreme temperatures from -55°C to 121°C and withstands shocks up to 5,000 g peak. Its case is fully isolated and hermetically sealed, protecting against moisture and contamination. Furthermore, the 330500-04-00 carries multiple hazardous area approvals, including Ex ia IIC T4 and Class I, Division 1, Groups A, B, C, D. Consequently, you can safely use it in explosive environments. Moreover, its output bias voltage stays stable at -12 ±3.0 VDC referenced to Pin A, ensuring consistent signal integrity over long cable runs up to 305 metres.

Technical Specifications

Electrical Characteristics

The sensor's core performance metrics are critical for accurate vibration analysis. First, the mounted resonant frequency exceeds 12 kHz, placing the operating range well below resonance for reliable readings. Second, the dynamic output impedance is less than 2400 Ω, and the broadband noise floor is just 0.004 mm/s (160 μin/s) rms from 4.5 Hz to 5 kHz. Meanwhile, the temperature sensitivity variation typically ranges between -14% to +7.5% over the full operating range. Therefore, you must consider this factor in highly variable thermal environments to avoid reading deviations.

Mechanical and Environmental Durability

Constructed from 316L stainless steel, this sensor weighs 142 grams and measures 25.3 mm in diameter by 63.2 mm in height. Its 2-pin Mil-C-5015 connector is also hermetically sealed with a 316L stainless steel shell. Besides, the recommended mounting torque lies between 32-46 kg cm (24-40 in-lb). Additionally, the sensor can endure 100% relative humidity (non-submerged) and shows a magnetic field susceptibility of <51 min/s/gauss. Specifically, its base strain sensitivity is rated at 0.005 in/s/mstrain, which minimizes errors from mounting surface flexure.

Approvals and Compliance

The Bently Nevada 330500-04-00 complies with FCC Part 15, EMC Directive 2014/30/EU, and RoHS Directive 2011/65/EU. Furthermore, it meets DNV classification rules for ships, high-speed craft, and offshore standards. Its hazardous area approvals include:

• Ex ia IIC T4 / AEx ia IIC T4

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

• Class II, Groups E, F, G and Class III

• Ex nL IIC T4 / AEx nA IIC T4 for Division 2

All installations must follow drawing 167537, with a T4 rating at -40°C ≤ Ta ≤ 100°C. Consequently, you can deploy this sensor in a wide variety of global industrial settings without additional certifications.

Installation Guidelines

Proper installation of the 330500-04-00 is essential for optimal performance. First, ensure the mounting surface is clean and completely flat. Next, apply the specified mounting torque of 32-46 kg cm to secure the sensor firmly. Remember, the sensor case is electrically isolated; when the case moves toward the connector, Pin A becomes positive relative to Pin B. For cable runs, Bently Nevada recommends a maximum length of 208 feet (63 metres) when assuming a 50g vibration at 10 kHz and a cable capacitance of 200 pf/m. However, using the specified cable (part number 02173006) allows runs up to 305 metres without any signal degradation. Finally, always observe the polarity markings during wiring to ensure correct signal phase.

Packaging List

• 1 x Bently Nevada 330500-04-00 Velomitor Piezo-velocity Sensor

• Installation instructions (drawing reference)

Note: Cables, mounting hardware, and documentation are sold separately. Shipping is handled via FedEx, UPS, or DHL.

Frequently Asked Questions

1. What is the primary application for the Bently Nevada 330500-04-00?
This sensor is mainly used for absolute vibration monitoring on rotating equipment like turbines, compressors, and pumps. Additionally, its robust design suits harsh industrial and offshore environments.

2. Can the 330500-04-00 be used in hazardous areas?
Yes, it carries multiple approvals including Ex ia IIC T4 and Class I, Division 1, Groups A, B, C, D. However, always refer to drawing 167537 for proper installation details.

3. What is the maximum cable length for this sensor?
With Bently Nevada cable part number 02173006, you can run up to 305 metres without signal loss. Nevertheless, a shorter recommended length of 63 metres is advised for high-frequency, high-g applications.

4. How does temperature affect the sensor's output?
The sensitivity can typically vary from -14% to +7.5% across the -55°C to 121°C range. Therefore, for best results, you should calibrate or compensate for extreme temperature shifts.

5. What tools are needed for installation?
You will need a torque wrench capable of 32-46 kg cm and appropriate wrenches for the 1/4-20 UNC thread. Besides, ensure the mounting surface is flat and clean before you begin.