Bently Nevada 330500-00-04 Velomitor CSA ATEX

Bently Nevada 330500-00-04 Velomitor Product Introduction

The Bently Nevada 330500-00-04 Velomitor provides direct velocity output for machine monitoring in hazardous locations across North America and Europe. This piezo-velocity sensor features agency approval option "-04", which includes both CSA and ATEX certifications. Its sensitivity reaches 3.94 mV/mm/s (100 mV/in/s) with a ±5% tolerance. Furthermore, the velocity range extends to 1270 mm/s (50 in/s) peak.

Mounting thread option "-00" means no adapter is required for direct installation. The case is electrically isolated from ground, effectively preventing ground loop issues. Additionally, the Bently Nevada 330500-00-04 uses a hermetically sealed 2-pin MIL-C-5015 connector with a 316L stainless steel shell. This rugged construction ensures reliable operation in corrosive and humid environments.

The primary advantage of this model is its multiple approval package. Specifically, you can install the same sensor in facilities requiring CSA certification for North America and ATEX certification for Europe. Therefore, global operations can standardize on a single sensor part number.

Technical Specifications of the 330500-00-04 Velomitor

Frequency Response and Accuracy
The Bently Nevada 330500-00-04 delivers a frequency response of 4.5 Hz to 5 kHz (270 to 300,000 cpm) at ±3.0 dB. For tighter tolerances, expect ±0.9 dB from 6.0 Hz to 2.5 kHz (360 to 150,000 cpm). Amplitude linearity stays within ±2% up to 152 mm/s (6 in/s) peak.

Output Characteristics
Output bias voltage measures -12 ±3.0 VDC over temperature, referenced to Pin A. Dynamic output impedance remains less than 2400 Ω. Consequently, the sensor drives long cable runs without any signal degradation.

Noise Floor and Transverse Sensitivity
Broadband noise floor from 4.5 Hz to 5 kHz is only 0.004 mm/s (160 μin/s) rms nominal. Transverse sensitivity remains less than 5% of axial sensitivity. This low noise floor allows accurate measurements of very small velocity changes.

Resonant Frequency
Mounted resonant frequency exceeds 12 kHz. This high resonance ensures the sensor avoids mechanical amplification within its normal 5 kHz operating range. Therefore, you get clean, reliable velocity data without spurious peaks.

Temperature and Base Strain Effects
Temperature sensitivity typically varies from -14% to +7.5% over the full -55°C to 121°C range. Base strain sensitivity is 0.005 in/s/mstrain. The case isolated design further reduces external electrical interference.

Hazardous Area Approvals for the 330500-00-04

The Bently Nevada 330500-00-04 holds both CSA and ATEX certifications for global installation flexibility:

ATEX Certifications (European)

• Ex ia IIC T4 (intrinsic safety for Zone 0, 1, 2)

• Ex nL IIC T4 (non-incendive for Zone 2)

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

CSA Certifications (North American)

• AEx ia IIC T4 for hazardous locations in Canada and the US

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

• Class II, Groups E, F, and G

• Class III (dust ignition-proof)

• Also approved for Class I, Division 2, Groups A, B, C, and D as Ex nA

Installation Requirement
You must install the Bently Nevada 330500-00-04 per drawing 167537. This drawing specifies intrinsic safety barriers, wiring methods, and entity parameters. Never exceed the safety barrier's ratings for the hazardous area installation.

Compliance and Certifications

Additionally, the Bently Nevada 330500-00-04 complies with:

• FCC Part 15 rules for electromagnetic emissions

• EMC Directive 2014/30/EU for European electromagnetic compatibility

• RoHS Directive 2011/65/EU for restriction of hazardous substances

• DNV rules for ships, high speed craft, and offshore standards

Mechanical and Environmental Parameters

Physical Dimensions and Weight
Weight without cable is typically 142 grams (5.0 oz). Diameter measures 25.3 mm (0.995 in). Height reaches 63.2 mm (2.49 in). Case material is 316L stainless steel, which provides excellent corrosion resistance in marine and chemical environments.

Environmental Limits
Operating temperature ranges from -55°C to 121°C (-67°F to 250°F). However, the hazardous area T4 rating limits ambient temperature to -40°C to 100°C. Shock survivability peaks at 5,000 g. Relative humidity tolerance reaches 100% non-submerged because the case is hermetically sealed.

Magnetic Field Susceptibility
Susceptibility stays below 51 min/s/gauss at 50 gauss, 50-60 Hz. This low value ensures accurate readings even when mounted near large motors or generators.

Mounting Torque and Polarity
Apply a mounting torque of 32-46 kg-cm (24-40 in-lb) maximum. When the sensor case moves toward the connector, Pin A becomes positive with respect to Pin B. This polarity convention helps you verify correct wiring during commissioning.

Maximum Cable Length
You can extend the cable up to 305 metres (1,000 feet) using part number 02173006 without signal degradation. For applications with 50g vibration at 10 kHz and 200 pf/m cable capacitance, Bently Nevada recommends a maximum length of 63 metres (208 feet) for optimal high-frequency response.

Installation Guidelines for the Bently Nevada 330500-00-04

Mechanical Installation
First, prepare a flat mounting surface with a minimum 32 minch rms finish. Clean the threaded hole thoroughly using a solvent to remove any oil or debris. Next, apply anti-seize compound if operating in high temperatures above 100°C. Then, screw the sensor into place by hand until finger-tight. Finally, tighten to 32-46 kg-cm (24-40 in-lb) using a calibrated torque wrench. Never exceed this maximum torque value.

Intrinsically Safe Wiring for CSA and ATEX
For Ex ia or Class I Division 1 installations, always connect an approved Zener barrier or galvanic isolator. The barrier must be certified for both CSA and ATEX if used globally. Connect the barrier to the Bently Nevada 330500-00-04 as shown in drawing 167537. Verify that total cable capacitance and inductance do not exceed the barrier's entity parameters. Use only shielded twisted pair cable for all field wiring.

Polarity Check Procedure
Verify that Pin A connects to the positive input of your monitoring system. The Bently Nevada 330500-00-04 produces a positive voltage when the case moves toward the connector. Perform a simple tap test with an oscilloscope to confirm correct polarity before final commissioning.

Grounding Strategy
The case is isolated from ground, so you do not need isolation washers. However, the cable shield should connect to ground at the monitor end only. Avoid ground loops by keeping shield connections single-point. For intrinsic safety circuits, follow the barrier manufacturer's grounding recommendations.

Packaging List

• Bently Nevada 330500-00-04 Velomitor piezo-velocity sensor (1 unit)

• Protective plastic dust cap for 2-pin MIL-C-5015 connector

• Installation instruction sheet (1 copy)

• CSA and ATEX compliance information sheet

Note: Certificates and warranty documents are not included in the package. Intrinsic safety barriers, cables, and mounting accessories are sold separately.

Shipping Information

All orders ship via FedEx, UPS, or DHL with tracking numbers provided. Delivery typically takes 3-7 business days depending on destination. Export documentation is included for international shipments.

Frequently Asked Questions (FAQ)

1. What is the difference between the 330500-00-02 and the 330500-00-04?
Both models have identical electrical specifications. The Bently Nevada 330500-00-02 carries ATEX approval only. The 330500-00-04 adds CSA approval for North American hazardous locations, making it suitable for global facilities that need both certifications.

2. Can I install this sensor in a Class I Division 1 location in the US?
Yes. The Bently Nevada 330500-00-04 holds AEx ia IIC T4 certification for Class I, Division 1, Groups A, B, C, and D. Follow drawing 167537 and use an approved intrinsic safety barrier. The T4 temperature rating applies from -40°C to 100°C.

3. Does the DNV certification cover both offshore and shipboard use?
Yes. The DNV rules cover ships, high speed and light craft, and offshore standards. Therefore, the Bently Nevada 330500-00-04 is suitable for maritime applications including drilling rigs, FPSOs, and cargo vessels.

4. What happens if I exceed the 100°C ambient temperature limit?
The sensor continues to function electrically up to 121°C. However, exceeding the 100°C T4 rating voids the hazardous area certification. Your facility inspection may fail, and safety cannot be guaranteed. Always respect the T4 temperature limit for approved installations.

5. Do I need different barriers for CSA and ATEX installations?
You need barriers certified for the specific approval you are using. For global facilities, select barriers with both CSA and ATEX certifications. The Bently Nevada 330500-00-04 works with any barrier that meets the entity parameters specified in drawing 167537.