Product Overview

The Bently Nevada 330880-28-15-020-01-02 is a complete PROXPAC XL proximity measurement system. This device monitors shaft vibration, position, and phase reference on rotating machinery. It combines a probe, extension cable, and proximitor sensor in a rugged housing. You get reliable performance for turbines, compressors, and pumps. This model features a 3300 XL 8 mm probe with multiple global approvals.

Technical Specifications

Measurement & Performance

• Linear Range: 2 mm (80 mils) from 0.25 mm to 2.3 mm gap.

• Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil) ±5%.

• Deviation from Best Fit Straight Line (DSL): Less than ±0.025 mm (±1 mil).

• Frequency Response: 0 to 10 kHz with +0, -3 dB rating.

• Recommended Gap Setting: 1.27 mm (50 mils).

Electrical Characteristics

• Power Requirement: -17.5 Vdc to -26 Vdc without barriers.

• Supply Sensitivity: Less than 2 mV output change per volt input change.

• Output Resistance: 50 Ω.

• Field Wiring: 0.2 to 1.5 mm² (16 to 24 AWG) shielded triax cable.

• Maximum Field Wiring Length: 305 metres (1000 feet).

Environmental Limits

• Probe Operating Temperature: -51 °C to +177 °C (-60 °F to +350 °F).

• Housing Rating: IP66 verified by BASEEFA report T07/0709.

• Housing Impact Strength: Withstands 4 Joule impacts at -39 °C and +115 °C.

• Minimum Target Size: 15.2 mm (0.6 in) diameter flat target.

• Minimum Shaft Diameter: 50.8 mm (2.0 in).

Mechanical Construction

• Probe Tip Material: Polyphenylene Sulfide (PPS).

• Probe Case Material: AISI 304 stainless steel.

• Probe Cable: 1-metre length, 75 Ω triaxial with FEP insulation.

• Probe Connector: Gold-plated brass ClickLoc® type.

• Probe Tensile Strength: 330 N (75 lb) maximum.

• Housing Material: UV-resistant, glass-reinforced PPS thermoplastic.

• Sleeve & Retaining Screws: AISI 303 and AISI 304 stainless steel.

• Vibration Isolation Material: Extra soft cellular silicone.

• Recommended Torque (Retaining Nut): 29.5 N·m (260 in·lb).

• Recommended Torque (Probe Sleeve Locknut): 39.3 N·m (350 in·lb).

Installation Guide

Follow these steps to install the Bently Nevada 330880-28-15-020-01-02 correctly. First, mount the outer sleeve on a rigid test stand. Ensure the housing axis stays parallel to horizontal. Second, secure the housing using the end hole on the outer sleeve. Tighten the retaining nut to 29.5 N·m (260 in·lb). Third, set the probe gap to 1.27 mm (50 mils) for best linear performance. Fourth, connect field wiring using 3-conductor shielded triax cable. Keep total wiring length under 305 metres (1000 feet). Finally, verify the supply voltage stays between -23 Vdc and -26 Vdc when using barriers.

Package Contents

• 1 x PROXPAC XL Proximitor housing assembly.

• 1 x 3300 XL 8 mm probe with 1-metre triaxial cable.

• 1 x Standoff adapter (1.5 inch / 38 mm B dimension).

• 1 x 3/4-14 NPT fitting and two plugs.

• 1 x Mounting thread adapter (3/4-14 NPT).

• 1 x Grounding liner and retaining plate (AISI 304).

• 1 x Outer sleeve with retaining screws.

• 1 x Sleeve O-ring (Neoprene material).

• 1 x Vibration isolation pad (extra soft cellular silicone).

Frequently Asked Questions (FAQ)

Q1: What machinery works best with the Bently Nevada 330880-28-15-020-01-02?
A: This model suits large rotating machines like steam turbines, gas compressors, and industrial pumps. It monitors radial vibration and axial position very well.

Q2: Can I use this probe below -34 °C (-29 °F) continuously?
A: Avoid exposing the probe to temperatures below -34 °C. This may cause premature failure of the pressure seal. The safe operating range starts at -51 °C, but long-term use below -34 °C is not recommended.

Q3: What happens if I supply a voltage more positive than -23.5 Vdc?
A: Operation above -23.5 Vdc reduces the linear measurement range. You will lose accuracy near the -1 Vdc to -17 Vdc output window. Always use -23 Vdc to -26 Vdc for best results.

Q4: How do I check the frequency response when using long field wiring?
A: The system maintains 0 to 10 kHz response with up to 305 metres of field wiring. For high-frequency signals, refer to the frequency response graph (Figure 1, page 7) to see signal rolloff.

Q5: Is the housing strong enough for high-vibration areas?
A: Yes. The housing supports 912 N (205 lbf) load with cover fastened. It also withstands 4 Joule impacts at extreme temperatures from -39 °C to +115 °C.