General Information

Core Description

The 330880-28-45-020-03-02 is a Bently Nevada PROXPAC XL proximity transducer assembly featuring a self-contained probe and sensor system. Completely integrated within a Type 4X and IP66 molded thermoplastic housing, this unit works seamlessly with machinery monitors to deliver direct field wiring loops and stable industrial vibration monitoring communication.

Specific Application

• Self-Contained Field Vibration Monitoring: Consolidating an 8mm eddy current probe and its matching 3300 XL Proximitor sensor into a unified electrical package to eliminate intermediate extension coaxial cables.
• Corrosive External Housing Deployments: Substituting standard steel or aluminum enclosures with glass-reinforced, conductive-fiber Polyphenylene Sulfide (PPS) to resist harsh chemical washes and safely dissipate electrostatic charges.
• Extended Penetration Clearances: Providing a precise mechanical configuration with a 4.5-inch standoff adapter and 2.0-inch penetration sleeve to reach deep inner shaft tracks through double-walled machinery casings.

Ordering Information

System Compatibility

System Compatibility

· Direct Monitor Links: Field wiring routes directly from the assembly terminal block over to the machinery protection monitor without using separate Proximitor housings.

· Cable Capacity: Supports twisted shielded 3-conductor triaxial or tinned field cabling over distances up to 305 meters (1,000 feet) between the assembly and monitor.

· Component Level Standards: Complies fully with European CE directives, Type 4X classifications, and API 670 standard backward operational metrics.

Alternative Model & Differences

· Alternative Model: Metric PROXPAC XL Transducer Assembly (Part Number 330881).

· Key Differences:

o Measurement Configuration Units: The 330880-28-45-020-03-02 operates strictly on English dimensions (ordered in 0.5-inch standoff steps and 0.1-inch sleeve steps), whereas the 330881 framework is designed entirely on metric scales (ordered in 10mm and 1mm increments).

o Thread & Fitting Thread Matrix: This English part number features standard 3/4-14 NPT conduit fitting threads and 3/4-14 NPT outer sleeve mounting threads, while the metric alternative introduces M24x3 structural mounting paths and metric M25 or M20 cable conduit holes.

Installation & Troubleshooting FAQ

Q1: What is the mandatory torque specification when locking down the sleeve and nut assemblies?

A: To prevent mechanical loosening from asset micro-vibrations while avoiding structural thread strip damage, field crews must use calibrated torque wrenches. Tighten the primary retaining nut firmly to 29.5 N·m (260 in·lb), and clamp down the outer probe sleeve locknut to a higher rating of 39.3 N·m (350 in·lb).

Q2: Why am I getting unstable voltage readings or reduced linear ranges from my loop output?

A: This behavior points directly to low power supply loops or improper voltage drops. The PROXPAC XL requires a stable operating input voltage from -17.5 VDC to -26 VDC when working without barriers, and -23 VDC to -26 VDC when passing through zener barriers. If your source power sags more positive than -23.5 VDC, it restricts the internal Proximitor sensor from achieving its rated 2 mm (80 mils) linear range.

Q3: How do I manage sensor cross-talk and side-view interference if the counterbore spacing is restricted?

A: When mapping two adjacent transducer systems, maintain a minimum tip separation distance of at least 40 mm (1.6 in) for axial alignments or 38 mm (1.5 in) for radial configurations to limit cross-talk below 50 mV. Additionally, because this specific option utilizes a short 2.0-inch penetration length, a custom casing counterbore may be required to clear surrounding walls and prevent physical signal dampening.

Accessories