Bently Nevada 330881-28-04-045-03-02 Proximity Transducer

Bently Nevada 330881-28-04-045-03-02 PROXPAC XL Proximity Transducer

Product Introduction

The Bently Nevada 330881-28-04-045-03-02 delivers precise shaft vibration and position measurements. This PROXPAC XL Proximity Transducer includes a 40 mm standoff adapter, which extends the probe mounting distance from the housing. Its IP66-rated enclosure provides excellent protection against water and dust. You can rely on this sensor for turbines, compressors, pumps, and other critical rotating equipment.

Technical Specifications

Measurement Performance
This system offers a linear range of 2 mm (80 mils). The linear range begins at approximately 0.25 mm from the target and extends to 2.3 mm. Its incremental scale factor (ISF) is 7.87 V/mm (200 mV/mil) ±5% when measured from 0°C to +45°C. Frequency response reaches 0 to 10 kHz with +0, -3 dB using up to 305 meters of field wiring. The deviation from best fit straight line (DSL) is less than ±0.025 mm for a standard 1-metre system.

Electrical Requirements
Power requires -17.5 Vdc to -26 Vdc without barriers at 12 mA maximum consumption. With barriers, use -23 Vdc to -26 Vdc. Supply sensitivity stays below 2 mV change per volt change. Output resistance is 50 Ω. Field wiring should use 0.2 to 1.5 mm² (16 to 24 AWG) 3-conductor shielded triax cable. Maximum field wiring length reaches 305 metres between the proximitor sensor and the monitor.

Probe and Cable Details
The Bently Nevada 330881-28-04-045-03-02 includes a 3300 XL 8 mm probe with multiple approvals. The probe tip uses polyphenylene sulfide (PPS) material. Its probe case is AISI 304 stainless steel. A 1-metre triaxial cable with FEP insulation connects via a gold-plated brass ClickLoc connector. Probe tensile strength reaches 330 N (75 lb) maximum.

Physical Dimensions
The standoff adapter option (B dimension) is 40 mm. Probe penetration (C dimension) equals 45 mm. Fittings include one M20 fitting plus two plugs. The mounting thread is 3/4-14 NPT. Total system weight is 1.44 kg (3.2 lbm).

Environmental and Mechanical Limits

Temperature Ranges
The probe operates from -51°C to +177°C (-60°F to +350°F). However, exposing the probe to temperatures below -34°C may cause premature seal failure. The housing withstands two separate 4 Joule impacts at -39°C and at 115°C, certified by BASEEFA. CSA also verified that the housing and cover can withstand a 7 Joule impact at room temperature.

Housing and Materials
The housing uses UV-resistant, glass-reinforced PPS thermoplastic with conductive fibers. The sleeve, retaining chain, grounding liner, and retaining plate are all AISI 304 stainless steel. Outer sleeve retaining screws use AISI 303 stainless steel. The sleeve O-ring material is neoprene. Vibration isolation material is extra soft cellular silicone.

Strength Ratings
The outer sleeve supports 912 N (205 lbf) when mounted on a test stand with the cover fastened. Recommended torque for the retaining nut is 29.5 N·m (260 in·lb). For the probe sleeve locknut, apply 39.3 N·m (350 in·lb).

Target and Shaft Requirements
Minimum target size is 15.2 mm (0.6 in) diameter for a flat target. The minimum shaft diameter is 50.8 mm (2.0 in). These values guarantee accurate linear measurement.

Installation Guidelines

First, verify that your mounting thread matches the 3/4-14 NPT specification. Next, set the recommended gap to 1.27 mm (50 mils) for optimal performance. Additionally, ensure the target surface is clean and meets the minimum size requirement. Then, apply the specified torque values to prevent damage. Finally, route the triaxial cable away from high-temperature sources and electromagnetic interference. The 40 mm standoff adapter provides extra clearance for installations with limited access behind the mounting point.

Packaging List

• 1 x Bently Nevada 330881-28-04-045-03-02 PROXPAC XL Proximity Transducer (complete assembly)

• 1 x Mounting hardware kit (including retaining nut and locknut)

• 1 x Installation manual

• 2 x Plugs for unused ports

Shipping Method: Fedex, UPS, DHL

Frequently Asked Questions (FAQ)

1. What is the purpose of the 40 mm standoff adapter on this model?
The standoff adapter on Bently Nevada 330881-28-04-045-03-02 extends the mounting distance between the housing and the probe tip. This feature helps you position the sensor correctly when space constraints or machine geometry prevent direct mounting.

2. Can I use this transducer in a hazardous location?
Yes, it carries multiple approvals including BASEEFA IP66 certification. However, always check local regulations for specific zone requirements before installation.

3. What happens if I operate below -23.5 Vdc?
Operation at a more positive voltage than -23.5 Vdc can reduce the linear range. Therefore, maintain power between -23 Vdc and -26 Vdc when using barriers.

4. How long can the field wiring be?
You can extend field wiring up to 305 metres (1,000 feet) between the proximitor sensor and the monitor. Nevertheless, refer to the frequency response graph for signal rolloff at high frequencies.

5. What is the deviation from best fit straight line (DSL) for this model?
For a standard 1-metre system, DSL is less than ±0.025 mm (±1 mil) from 0°C to 45°C. This ensures high measurement accuracy for your critical machinery monitoring applications.