Bently Nevada 330500-01-02 Velomitor Piezo-Velocity Sensor

Bently Nevada 330500-01-02 Velomitor Sensor with ATEX

Product Introduction

The Bently Nevada 330500-01-02 is a premium Velomitor piezo-velocity sensor designed for precise vibration measurement on rotating machinery. This particular version features a 1/2-20 UNF 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, making it ideal for a wide array of monitoring tasks. Additionally, the sensor exhibits a low transverse sensitivity of less than 5%, which effectively minimizes cross-axis interference. For instance, its amplitude linearity stays within ±2% to 152 mm/s (6 in/s) peak, ensuring accurate readings across a broad dynamic range.

This sensor operates reliably in extreme temperatures from -55°C to 121°C and withstands mechanical shocks up to 5,000 g peak. Its case is fully isolated and hermetically sealed, providing excellent protection against moisture and contaminants. Furthermore, the 330500-01-02 carries the crucial -02 ATEX (European) approval, making it suitable for use in potentially explosive atmospheres across Europe. Consequently, you can deploy this sensor in oil refineries, chemical plants, and gas processing facilities with full regulatory compliance. Moreover, its output bias voltage remains 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 electrical parameters are fundamental for dependable vibration analysis. First, the mounted resonant frequency exceeds 12 kHz, placing the operating range safely below resonance for trustworthy data collection. Second, the dynamic output impedance measures less than 2400 Ω, and the broadband noise floor is a nominal 0.004 mm/s (160 μin/s) rms from 4.5 Hz to 5 kHz. Meanwhile, the temperature sensitivity variation typically ranges from -14% to +7.5% over the full operating temperature range. Therefore, you must account for this factor in environments with significant thermal fluctuations to prevent measurement errors.

Mechanical and Environmental Durability

Constructed from robust 316L stainless steel, this sensor weighs 142 grams and has a diameter of 25.3 mm with a height of 63.2 mm. Its 2-pin Mil-C-5015 connector also features a hermetically-sealed 316L stainless steel shell for added resilience. Besides, the recommended mounting torque falls between 32-46 kg cm (24-40 in-lb) to ensure proper fixation. Additionally, the sensor can tolerate 100% relative humidity (non-submerged) and demonstrates 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 caused by mounting surface flexure.

Approvals and Compliance

The Bently Nevada 330500-01-02 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. The key differentiator for this model is its ATEX (European) approval, which includes:

• 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 temperature rating at -40°C ≤ Ta ≤ 100°C. Consequently, this sensor meets the stringent requirements for use in European hazardous areas, giving you peace of mind for regulatory audits.

Installation Guidelines

Proper installation of the 330500-01-02 is critical for achieving optimal performance and maintaining its ATEX certification. First, clean the mounting surface thoroughly and ensure it is perfectly flat. Next, apply the specified mounting torque of 32-46 kg cm to secure the sensor without overtightening. 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 maintain correct signal phase and ensure safe operation in hazardous areas.

Packaging List

• 1 x Bently Nevada 330500-01-02 Velomitor Piezo-velocity Sensor (ATEX approved)

• Installation instructions (drawing reference 167537)

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

Frequently Asked Questions

1. What makes the 330500-01-02 different from the standard 330500 model?
This version includes the -02 ATEX (European) agency approval option. Therefore, it is specifically certified for use in explosive atmospheres within European jurisdictions.

2. Can I use this sensor in a Class I, Division 1 environment?
Yes, the Bently Nevada 330500-01-02 carries Class I, Division 1, Groups A, B, C, D approval. However, you must install it per drawing 167537 to maintain its hazardous area rating.

3. What is the maximum cable length for this ATEX-approved 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. Does the ATEX approval affect the sensor's electrical specifications?
No, the electrical performance remains identical to other 330500 models. Specifically, you still get 3.94 mV/mm/s sensitivity and a 4.5 Hz to 5 kHz frequency response.

5. What torque should I apply when mounting this sensor?
You should apply a torque between 32-46 kg cm (24-40 in-lb) . Besides, ensure the mounting surface is clean and flat before installation to avoid measurement errors.