Product Overview

The Bently Nevada 330880-28-30-056-01-02 is a complete PROXPAC XL proximity measurement system. This unit monitors shaft vibration, position, and phase reference on rotating machinery. It features a 3300 XL 8 mm probe with multiple global approvals. The system includes a 300 mm standoff adapter for extended reach. You get reliable performance for turbines, compressors, and large pumps.

Technical Specifications

Measurement and 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 DSL: Less than ±0.025 mm (±1 mil) at 0 °C to +45 °C.

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

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

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

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

Probe Configuration

• Probe Option: 3300 XL 8 mm probe with multiple approvals.

• Standoff Adapter (B Dimension): 300 mm length.

• Probe Penetration (C Dimension): 56 mm.

• Probe Cable Length: 1 metre of 75 Ω triaxial cable.

• Cable Insulation: Fluoroethylene propylene (FEP) material.

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

• Probe Tip Material: Polyphenylene Sulfide (PPS).

• Probe Case Material: AISI 304 stainless steel.

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

Fittings and Mounting

• Fittings Option (01): One M25 fitting and two plugs.

• Mounting Thread Option: 3/4-14 NPT required with standoff adapter.

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

Electrical Characteristics

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

• Power with Barriers: -23 Vdc to -26 Vdc.

• 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).

Mechanical Construction

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

• Sleeve Material: AISI 304 stainless steel.

• Outer Sleeve and Retaining Screws: AISI 303 stainless steel.

• Sleeve O-Ring Material: Neoprene.

• Grounding Liner Material: AISI 304 stainless steel.

• Vibration Isolation Material: Extra soft cellular silicone.

• Lid Label Material: Gloss radiant white polyester.

Torque Specifications

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

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

Housing Strength

• Static Load Support: 912 N (205 lbf) with cover fastened.

• Impact Strength (BASEEFA): Two separate 4 Joule impacts at -39 °C and +115 °C.

• Impact Strength (CSA): 7 Joule impact at ambient room temperature.

Environmental Limits

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

• Low Temperature Warning: Exposing probe below -34 °C may cause premature pressure seal failure.

• Total System Weight: 1.44 kg (3.2 lbm) with 0.3 metre sleeve length.

Installation Guide

Follow these steps to install the Bently Nevada 330880-28-30-056-01-02 correctly. First, mount the outer sleeve on a rigid test stand parallel to horizontal. Second, secure the housing through the end hole on the outer sleeve. Third, tighten the retaining nut to 29.5 N·m (260 in·lb). Fourth, install the M25 fitting and two plugs into the conduit ports. Fifth, set the probe gap to 1.27 mm (50 mils) for best linear performance. Sixth, connect field wiring using 3-conductor shielded triax cable. Seventh, verify the supply voltage stays between -23 Vdc and -26 Vdc when using barriers. Finally, keep total wiring length under 305 metres (1000 feet).

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 (300 mm / 300 mm B dimension).

• 1 x M25 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 (AISI 303/304).

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

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

Frequently Asked Questions (FAQ)

Q1: What makes the Bently Nevada 330880-28-30-056-01-02 different from standard PROXPAC models?
A: This model features a 300 mm standoff adapter and 56 mm probe penetration. The probe option 28 includes multiple global approvals for hazardous areas. The fittings option 01 provides an M25 fitting instead of NPT fittings.

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

Q3: What happens if I supply a voltage more positive than -23.5 Vdc to the Bently Nevada 330880-28-30-056-01-02?
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 with barriers for best results.

Q4: How do I verify 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 above 10 kHz, refer to the frequency response graph (Figure 1, page 7) to see signal rolloff.

Q5: Is the housing strong enough for high-vibration areas with the Bently Nevada 330880-28-30-056-01-02?
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. The IP66 rating ensures protection against dust and water jets.