330881-16-04-189-06-02 Proximity Transducer Bently Nevada PROXPAC XL Probe

Overview

The 330881-16-04-189-06-02 is a heavy-duty PROXPAC XL Proximity Transducer assembly designed by Bently Nevada. Integrating an 8 mm proximity probe inside an IP66 weather-proof housing, the 330881-16-04-189-06-02 provides precise non-contact vibration and axial position measurements for turbomachinery operating in hostile industrial environments.

Part Number Configuration Breakdown

The ordering code for the Bently Nevada 330881-16-04-189-06-02 defines the exact mechanical and mounting options:

• 330881 : PROXPAC XL Proximity Transducer Series
• -16 : Probe and Approvals Option (3300 XL 8 mm probe, without agency approvals)
• -04 : Standoff Adapter Option (B Dimension: 40 mm adapter length)
• -189 : Probe Penetration Option (C Dimension: 189 mm sleeve penetration length)
• -06 : Fittings Option (One 3/4-14 NPT fitting, one 3/4-14 NPT to 1/2-14 NPT stainless steel reducer, two plugs)
• -02 : Mounting Thread Option (3/4-14 NPT outer thread)

MECE Technical & Mechanical Specifications

The technical parameters of the 330881-16-04-189-06-02 transducer assembly are categorized below across operational vectors:

• System Identification & Origin
  • Brand Manufacturer: Bently Nevada
  • Full Model Code: 330881-16-04-189-06-02
  • Country of Origin: Made in U.S.A.
  • Total Assembly Weight: 1.44 kg (3.2 lbs typical)
• Transducer Measurement & Precision
  • Linear Range: 2 mm (80 mils), starting 0.25 mm (10 mils) from target
  • 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) at 0 °C to +45 °C
  • Frequency Response: 0 Hz to 10 kHz (+0, -3 dB with up to 305 m field wiring)
  • Recommended Gap Setting: 1.27 mm (50 mils)
  • Minimum Target Constraints: Shaft diameter ≥ 50.8 mm (2.0 in); Flat target diameter ≥ 15.2 mm (0.6 in)
• Electrical Power & Wiring Constraints
  • Supply Voltage Requirement: -17.5 VDC to -26 VDC (12 mA max consumption)
  • Supply Sensitivity: Less than 2 mV output voltage change per volt input change
  • Output Resistance: 50 Ω
  • Field Wiring Terminal: 0.2 to 1.5 mm² (16 to 24 AWG) shielded 3-conductor triax (Max 305 m)
• Materials & Mechanical Integrity
  • Housing Construction: UV-resistant, glass-reinforced PPS thermoplastic with conductive fibers
  • Probe Tip Material: Polyphenylene Sulfide (PPS)
  • Probe Case & Sleeve: AISI 304 Stainless Steel
  • Outer Sleeve & Screws: AISI 303 Stainless Steel
  • Cable & Connector: 1-meter 75 Ω triaxial FEP cable with gold-plated brass ClickLoc connector
  • Probe Tensile Strength: 330 N (75 lb) maximum between probe cable and case
  • Fastener Torque Ratings: Retaining nut: 29.5 N·m; Probe sleeve locknut: 39.3 N·m
• Environmental Limits & Enclosure Ratings
  • Housing Protection Index: IP66 rated (verified by BASEEFA report T07/0709)
  • Probe Operating Temperature: -51 °C to +177 °C (-60 °F to +350 °F)
  • Mechanical Impact Certification: BASEEFA certified for 4 Joule impacts at -39 °C and +115 °C; CSA certified for 7 Joule impacts

Selection Comparison & Engineering Advice

When choosing between PROXPAC XL variants, penetration length and standoff selection directly affect mechanical fitment:

Technical Advice: Verify the target shaft depth prior to ordering. Installing a longer 189 mm penetration sleeve like the 330881-16-04-189-06-02 into a shallow port will bottom out the probe tip onto the shaft, destroying the ceramic/PPS face. Use the 40 mm standoff adapter to fine-tune external sleeve length when internal clearances are tight.

Target Equipment & Diagnostic Capabilities

• Target Machine Platforms: Boiler feed pumps, steam turbines, centrifugal gas compressors, gearboxes, and large electric motors.
• Diagnostic Capabilities: Measures real-time radial vibration, shaft thrust position, phase reference (Keyphasor), and eccentric motion. Changes in gap voltage indicate dynamic shaft displacement or bearing wear.

Express Logistics & Quality Guarantee

• 12-Month Coverage Warranty: Every 330881-16-04-189-06-02 transducer unit includes a 12-month quality warranty.
• Rapid Shipping: Dispatched in 24 to 48 hours with international express delivery via FedEx, UPS, or DHL.
• Package Checklist: Includes 1 x Bently Nevada 330881-16-04-189-06-02 housing assembly with integrated 8 mm probe and conduit fittings.

Global PLC Spare HUB's Insight

Our machinery diagnostic teams frequently deploy the 330881-16-04-189-06-02 on heavy industrial gas turbines where outdoor rain, steam washdown, and hot oil sprays destroy standard unhoused proximity probes. On a offshore platform compressor retrofit, harsh weather was cracking standard plastic probe junction boxes. Upgrading to the IP66 glass-reinforced PPS housing of the 330881-16-04-189-06-02 provided continuous mechanical protection while the 189 mm sleeve reach easily accessed the internal journal bearing target through heavy thermal insulation.

Selection Guide & Field FAQ

Frequently Asked Questions

Q: What cable precaution must be taken when wiring the ClickLoc connector inside the housing?

A: Ensure the gold-plated ClickLoc connector clicks firmly into place and apply silicone self-fusing tape over the junction to prevent moisture ingress inside the housing tube.

Q: What is the recommended gap setting procedure for the 330881-16-04-189-06-02 transducer?

A: Set the physical mechanical gap to 1.27 mm (50 mils) or adjust mechanically until the Proximitor sensor output reads approximately -10.0 VDC at center position.

Q: How does cold weather affect the outer housing of this PROXPAC assembly?

A: The thermoplastic housing is certified by BASEEFA to withstand 4 Joule mechanical impacts down to -39 °C without cracking or losing seal integrity.

Q: Can field wiring extend beyond 300 meters without distorting vibration readings?

A: Up to 305 meters (1,000 feet) of 3-conductor shielded triax cable is supported with a frequency response of 0 to 10 kHz (-3 dB max attenuation).

Q: Why is the 3/4-14 NPT to 1/2-14 NPT stainless steel reducer included in option 06?

A: It allows flexible field conduit interfacing, enabling technicians to terminate standard 1/2-inch flexible armored field wiring directly into the 3/4-inch housing ports.

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