The Bently Nevada 330881-16-04-189-06-02, also cataloged as the 330881 PROXPAC XL Proximity Transducer, operates as a dedicated hardware component for eddy-current displacement measurement within TSI (Turbine Supervisory Instrumentation) networks.

Order Code Breakdown

• 330881: Base model, PROXPAC XL Proximity Transducer Assembly
• -16-: 3300 XL 8 mm probe without approvals
• -04-: Standoff Adapter Option 40 mm
• -189-: Probe Penetration Option 189 mm
• -06-: One 3/4-14 NPT fitting, one 3/4-14 NPT to 1/2-14 NPT SST reducer, two plugs
• -02: Mounting Thread Option 3/4-14 NPT

Technical Data

Eddy-Current Probe Scaling & Rotor Dynamics

The 3300 XL 8 mm probe operates on eddy-current transduction principles with a linear range of 2 mm and sensitivity of 7.87 V/mm (200 mV/mil). Gap voltage validation targets -10 VDC at mid-scale to maintain measurement linearity for rotor dynamics applications. Cross-talk suppression is achieved through shielded FluidLoc cabling and the conductive fiber-reinforced PPS housing, which dissipates electrostatic charges in high-noise TSI environments.

Ordering info

• 1 x Bently Nevada 330881-16-04-189-06-02 PROXPAC XL Proximity Transducer Assembly
• Note: Accessories, manuals, calibration data, separate extension cables, and standalone Proximitor housings are not included unless explicitly listed.

Site Mounting Rules

• Engage 3/4-14 NPT threads with minimum 5 full thread engagements into the process connection.
• Install SST reducer (3/4-14 NPT to 1/2-14 NPT) where smaller conduit or cable gland is required.
• Maintain minimum bend radius on integrated 75 Ohm triaxial FluidLoc cable; protect with AISI 304 stainless steel armor in high-vibration zones.
• Terminate shield drain wire at monitor end only to prevent ground loops.

Technical Inquiries

• Does the PROXPAC XL support hot-swap replacement on live machinery?

  No. The integrated Proximitor sensor and probe assembly must be installed with power removed from the monitor loop to prevent transient overvoltage to the conditioning circuit and erroneous TSI trip signals.

• What is the loop current load of this transducer?

  The 3300 XL Proximitor sensor draws excitation current from the connected monitor (e.g., 3500 series). Typical loop load is defined by the monitor's Proximitor interface; the transducer presents a fixed impedance probe coil (~50 to ~550 Ohm depending on gap).

• Is the PPS housing suitable for explosive atmospheres?

  The PPS housing with conductive fibers provides EMI dissipation but does not carry intrinsic safety certification. Use only in locations per the 3300 XL system approval rating. This unit is configured without additional approvals (-16- option).

• Can a standard 3300 XL extension cable be added?

  No. The PROXPAC XL integrates the probe, extension cable, and Proximitor into a single housing. No separate extension cable is used or supported between the probe and sensor inside the assembly.

• What gap voltage range is valid for commissioning?

  Typical gap voltage validation uses -9 to -11 VDC at installed position. The -10 VDC nominal target corresponds to mid-linear range of the 8 mm probe. Field adjustment must follow the monitor's bias voltage verification procedure.

• Does the 40 mm standoff adapter affect probe linear range?

  The 40 mm standoff defines the physical offset between the housing face and probe tip reference plane. It does not alter the electrical linear range (2 mm) of the 8 mm probe but changes the mechanical installation geometry.

• What is the purpose of the two plugs in the -06- fitting option?

  The two plugs seal unused ports in the housing to maintain Type 4X / IP66 enclosure rating. Remove only the plug corresponding to the active cable entry point.

• Can the probe penetration be adjusted beyond 189 mm?

  The 189 mm probe penetration is a fixed configuration per the order code. Mechanical modification in the field is not supported and voids the enclosure and approval ratings.