Technical Specifications

Electrical Parameters

• Power Requirement: Needs -17.5 Vdc to -26 Vdc without barriers. Maximum current draw is 12 mA.

• Linear Range: Provides 2 mm (80 mils) of usable measurement. The range starts at 0.25 mm from the target.

• Incremental Scale Factor (ISF): Delivers 7.87 V/mm (200 mV/mil) ±5%. This applies from 0°C to +45°C.

• Frequency Response: Covers 0 to 10 kHz with +0, -3 dB. Works with up to 305 metres of field wiring.

• Output Resistance: Fixed at 50 Ω for stable signal transmission.

• Supply Sensitivity: Shows less than 2 mV output change per volt of input change.

Mechanical & Environmental Limits

• Probe Tip Material: Made of Polyphenylene Sulfide (PPS) for chemical resistance.

• Probe Case Material: Uses AISI 304 stainless steel to resist corrosion.

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

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

• Housing Impact Strength: Certified to withstand two separate 4 Joule impacts at extreme temperatures.

• Total System Weight: Typical weight is 1.44 kg (3.2 lbm) with a 0.3 metre sleeve.

• Probe Tensile Strength: Supports up to 330 N (75 lb) between probe cable and case.

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

Physical Dimensions & Options

• Probe and Approvals Option: Uses Option 28 (3300 XL 8 mm probe with multiple approvals).

• Standoff Adapter (B Dimension): Set to 40 mm for very short mounting requirements.

• Probe Penetration (C Dimension): Fixed at 50 mm total length.

• Mounting Thread: Uses 3/4-14 NPT as required for the standoff adapter.

• Fittings Option: Includes one 3/4-14 NPT fitting, one reducer, and two plugs.

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

• Probe Connector: Equipped with a gold-plated brass ClickLoc connector.

• Sleeve Material: Made from AISI 304 stainless steel for long service life.

• Vibration Isolation: Uses extra soft cellular silicone material.

Installation Guide

Follow these steps to install the Bently Nevada 330881-28-04-050-06-02 correctly.

1. Check clearance space: Verify the 40 mm standoff adapter fits your mounting location.

2. Prepare the mounting hole: Ensure threads match the 3/4-14 NPT standard.

3. Set the recommended gap: Adjust the probe to a 1.27 mm (50 mils) gap from the target.

4. Tighten the retaining nut: Apply 29.5 N·m (260 in·lb) of torque.

5. Secure the probe sleeve locknut: Apply 39.3 N·m (350 in·lb) of torque.

6. Connect field wiring: Use a 3-conductor shielded triax cable. Maximum length is 305 metres.

Packaging List

• 1 x PROXPAC XL proximity transducer assembly (Model 330881-28-04-050-06-02)

• 1 x 3300 XL 8 mm probe with multiple agency approvals (Option 28)

• 1 x Standoff adapter (40 mm B dimension)

• 1 x 3/4-14 NPT fitting and one 3/4-14 NPT to 1/2-14 NPT SST reducer

• 2 x Plugs for unused ports

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

• 1 x Printed quick-start installation guide

• 1 x Gold-plated brass ClickLoc connector (pre-attached to cable)

Frequently Asked Questions (FAQ)

Q1: What makes this model different from standard PROXPAC XL units?
A1: This model has a shorter 40 mm standoff adapter (B dimension) and 50 mm probe penetration. Standard versions typically use 100 mm standoffs.

Q2: Can this short-probe transducer work in high-temperature areas?
A2: Yes, the probe operates from -51°C to +177°C. The short design does not reduce temperature tolerance.

Q3: What is the minimum shaft diameter for this proximity probe?
A3: The Bently Nevada 330881-28-04-050-06-02 requires a minimum shaft diameter of 50.8 mm (2.0 inches).

Q4: How do I avoid losing linear range on this device?
A4: Never operate at a more positive voltage than -23.5 Vdc. Staying within -23 Vdc to -26 Vdc ensures full linear range.

Q5: Is the housing suitable for outdoor installations with high moisture?
A5: Absolutely. The housing carries an IP66 rating, making it fully dust-tight and protected against strong water jets.