330881-28-06-155-03-02 Bently Nevada Proximity Transducer

Bently Nevada 330881-28-06-155-03-02 PROXPAC XL Proximity Transducer

Product Introduction

The Bently Nevada 330881-28-06-155-03-02 provides reliable shaft vibration and position measurements. This PROXPAC XL Proximity Transducer integrates a probe, housing, and cable into one ready-to-use system. Its IP66-rated enclosure withstands harsh industrial environments. You can use this sensor for turbo-machinery monitoring, including compressors and turbines.

Technical Specifications

Measurement Performance
The system offers a linear range of 2 mm (80 mils), starting from 0.25 mm to 2.3 mm. Its incremental scale factor (ISF) is 7.87 V/mm (200 mV/mil) ±5% across 0°C to +45°C. The frequency response reaches 0 to 10 kHz with +0, -3 dB using up to 305 meters of field wiring.

Electrical Requirements
Power requires -17.5 Vdc to -26 Vdc without barriers at 12 mA maximum consumption. The 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.

Probe and Cable Details
The Bently Nevada 330881-28-06-155-03-02 includes a 3300 XL 8 mm probe with multiple approvals. Its probe tip uses polyphenylene sulfide (PPS) material. The probe case is AISI 304 stainless steel. A 1-metre triaxial cable with FEP insulation connects via a gold-plated brass ClickLoc connector. The probe tensile strength reaches 330 N (75 lb).

Physical Dimensions
The standoff adapter (B dimension) is 60 mm. Probe penetration (C dimension) equals 155 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) with a 0.3 metre sleeve.

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.

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 AISI 304 stainless steel. Outer sleeve retaining screws use AISI 303 stainless steel. Vibration isolation material is extra soft cellular silicone.

Strength Ratings
The outer sleeve supports 912 N (205 lbf) 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, use 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 ensure accurate linear measurement.

Installation Guidelines

First, ensure the target surface meets the minimum size requirement. Next, set the recommended gap to 1.27 mm (50 mils) for optimal performance. Additionally, verify the mounting thread matches your machine’s port. Then, apply the specified torque values to avoid damage. Finally, route the triaxial cable away from high-temperature sources and electromagnetic interference.

Packaging List

• 1 x Bently Nevada 330881-28-06-155-03-02 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. Can I use the Bently Nevada 330881-28-06-155-03-02 in a hazardous area?
Yes, it carries multiple approvals including BASEEFA IP66 certification. However, always check local regulations for specific zone requirements.

2. 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.

3. 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.

4. Is the probe cable replaceable separately?
No, the PROXPAC XL Proximity Transducer integrates the probe and cable. For this reason, you must replace the entire assembly if the cable gets damaged.

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.