Product Overview

The Bently Nevada 330881-28-05-035-01-02 Proxpac XL serves as a robust, integrated solution for monitoring vibration and position in mission-critical rotating assets. This transducer system combines the high-precision 3300 XL 8mm probe with an integrated housing, simplifying installation in space-constrained industrial environments while maintaining high-fidelity telemetry. It continuously captures dynamic shaft displacement, feeding critical data directly into plant-wide DCS platforms and Bently Nevada 3500 monitoring racks for real-time analysis. By consolidating probe, standoff adapter, and enclosure electronics into a single assembly, the Proxpac XL reduces wiring complexity and installation footprints. Engineers rely on its consistent, interference-free signal output to drive predictive maintenance and safety-critical emergency shutdown (ESD) systems in high-velocity turbines, process compressors, and large industrial pumps, effectively shielding assets from mechanical degradation and rotor instability.

Suffix Architecture and Configuration Logic

The model string defines the physical integration and environmental adaptation parameters of the Proxpac XL system.

28 - Probe and Approval Variant

The '28' configuration specifies the inclusion of the 3300 XL 8mm proximity probe, fully optimized for multiple global hazardous area certifications, ensuring the system meets stringent safety requirements for explosive environments.

05 - Standoff Adapter Length

The 50 mm (05) standoff adapter provides the necessary mechanical spacing to accommodate varying machine casing thicknesses, ensuring the probe tip maintains the optimal air gap relative to the target shaft.

035 - Probe Penetration

This 35 mm penetration depth defines the precise extent to which the probe extends past the standoff adapter, enabling accurate targeting of the shaft surface within complex, deep-bore bearing housings.

01 - Fittings Configuration

The system features one M25 cable fitting and two sealing plugs, providing a flexible and secure conduit entry point that protects the internal wiring from moisture, dust, and corrosive process vapors.

02 - Mounting Thread Interface

The 3/4-14 NPT mounting thread provides a high-torque, pressure-resistant connection to the machine housing, ensuring the transducer assembly remains rigidly anchored against intense mechanical vibration and thermal cycling.

Technical Specifications

Engineering and Installation Guidelines

Precision is paramount when setting the mechanical gap for the Proxpac XL. Rotate the 3/4-14 NPT mounting threads until the sensing tip achieves the required physical clearance from the shaft, then verify the gap voltage is exactly -10.0 VDC using a digital voltmeter at the transducer output. Ensure the M25 cable fitting is tightened to industry-standard torque to prevent ingress of process fluids. Grounding must remain strictly isolated from high-voltage noise sources to maintain the high-frequency integrity of the eddy current loop. Periodically inspect the transducer assembly during planned outages to ensure no vibrations have loosened the NPT mounting threads or affected the probe penetration depth.

Engineering Advantages and System Synergy

The Proxpac XL offers superior durability in hostile industrial climates where thermal expansion and chemical exposure challenge standard monitoring hardware. Its unified design mitigates the risk of signal loss at cable junctions, significantly reducing maintenance overhead compared to multi-component monitoring setups.

Integration into existing Turbine Supervisory Instrumentation (TSI) platforms is seamless, allowing for high-speed raw data transmission that supports complex shaft orbital diagnostics. Whether feeding Honeywell Experion PKS for predictive analytics or driving local safety interlocks, this transducer system delivers the stability required to protect high-capital investments from unforeseen mechanical contact or rotor instability.

Ordering and Component Manifest

(1) One fully integrated Bently Nevada 330881-28-05-035-01-02 Proxpac XL assembly.

(2) Pre-configured 3/4-14 NPT mounting hardware with M25 cable entry points.

(3) Dual sealing plugs for unused conduit ports to maintain environmental isolation.

(4) Factory calibration and compliance documentation for global hazardous area safety.

Logistics and Global Dispatch

Order fulfillment proceeds within 2-7 days once payment finish confirmation is received. We route all sensor shipments via premium express couriers, including DHL, FEDEX, and UPS, to guarantee expedited arrival and full tracking. Every Proxpac XL system undergoes a final quality inspection before being carefully packed into specialized anti-static industrial packaging. This protective, ESD-shielded containment guards the precision electronic components against electrostatic discharge and physical impacts throughout the shipping process, ensuring the unit arrives in pristine, ready-to-install condition.

Technical Support FAQs

Q1: Why is the Proxpac XL considered an integrated solution compared to standard 3300 XL probe kits?

A1: The Proxpac XL integrates the probe, adapter, and housing into one assembly, which minimizes external cabling and eliminates common failure points associated with exposed cable runs in harsh industrial environments.

Q2: How do I measure the health of the internal probe coil within the Proxpac housing?

A2: Using a digital multimeter, check the resistance between the signal pins on the internal terminal block; a healthy 3300 XL 8mm probe coil typically returns a value between 6.0 and 8.0 ohms, indicating no internal opens or shorts.

Q3: Can the 3/4-14 NPT thread be adapted if the machine port is a different size?

A3: We recommend using high-quality thread reducers or adapters specifically designed for vibration monitoring applications to ensure the transducer remains rigid, as excessive mechanical play can introduce false vibration readings.

Q4: Does the output resistance of 50 ohms require specific matching with the monitor rack?

A4: Yes, the 50-ohm output impedance is designed for standard Bently Nevada 3500 rack input cards, ensuring proper voltage signal transfer and maintaining the high-frequency response required for accurate eddy current measurement.

Q5: Is this Proxpac XL system fully backwards compatible with legacy 3300 monitors?

A5: Yes, the 3300 XL 8mm component inside the Proxpac XL is electrically and physically compatible with older 3300-series proximity monitoring hardware, making it a reliable drop-in replacement for modernization projects.