330881-28-00-135-03-00 | Bently Nevada | PROXPAC XL Proximity Transducer, Metric

Product Description

The 330881-28-00-135-03-00 is a metric-series PROXPAC XL proximity transducer assembly that integrates a high-performance 3300 XL 8 mm probe within a ruggedized housing. This system is a critical component of Turbine Supervisory Instrumentation (TSI), specifically developed for applications where standard probes require additional environmental protection. Commonly used in power generation, large-scale water treatment, and petrochemical processing facilities, the PROXPAC XL provides reliable non-contact displacement measurements for vibration and axial thrust monitoring. By enabling external probe adjustment and replacement, the 330881-28-00-135-03-00 reduces maintenance time and supports continuous operation of critical rotating equipment such as pumps, fans, and small turbines.

Model Configuration

The model 330881-28-00-135-03-00 uses a modular suffix structure to define its mechanical configuration and regulatory compliance:

• 28 (Probe and Approvals): Includes a 3300 XL 8 mm probe with Multiple Approvals (ATEX, IECEx, CSA, etc.) for use in hazardous area installations worldwide.
• 00 (Standoff Adapter): No standoff adapter is included in this configuration.
• 135 (Probe Penetration): Designed for a penetration depth of 135 mm into the machine casing.
• 03 (Fittings): Supplied as a kit containing one M20 fitting and two plugs for cable entry and enclosure sealing.
• 00 (Mounting Thread): No outer sleeve assembly is included for this configuration.

Technical Parameters

Application Questions

What is the primary advantage of the PROXPAC XL housing compared with a standard probe installation?
The PROXPAC XL housing provides a robust environmental seal and mechanical protection for the probe lead. More importantly, it allows the probe to be adjusted and replaced externally without removing machine covers, which significantly reduces maintenance time and operational downtime.

How does the Multiple Approvals (Option 28) support international projects?
Option 28 ensures the probe complies with intrinsic safety and explosion-proof standards including ATEX, IECEx, and North American CSA/NRTL certifications. This makes the 330881-28-00-135-03-00 suitable for multinational installations and simplifies spare parts management across different regions.

Can the probe penetration be adjusted after manufacturing?
The 135 mm penetration depth is a fixed mechanical dimension of the internal sleeve and probe assembly. Although minor adjustment is possible through the mounting threads, the primary penetration length must be correctly specified during equipment selection to match the machine casing-to-shaft clearance.

Installation Guidelines

• Gap Voltage Calibration: For radial vibration monitoring, set the probe gap near the center of the linear measurement range. Connect the probe to a powered Proximitor sensor and adjust the insertion depth until the DC output voltage is approximately -10 VDC. Tighten the locking nut to 4.5 N·m (40 in-lb) to maintain a stable mechanical setting during operation.
• Environmental Sealing: Use the M20 fitting and plugs supplied in the Option 03 kit to seal any unused ports in the PROXPAC housing. Proper sealing prevents moisture, oil, and airborne contaminants from entering the enclosure and affecting signal reliability.
• Side-Clearance Requirements: Maintain a minimum radial clearance of 13 mm (0.5 inches) between the probe tip and surrounding metal surfaces other than the target shaft. Insufficient clearance may result in side-viewing interference and inaccurate vibration measurements.
• Chemical Resistance: The probe tip is manufactured from Polyphenylene sulfide (PPS), which offers strong resistance to most industrial lubricants and fuels. Verify that any cleaning solvents used during maintenance are compatible with both PPS materials and the Viton O-rings used for pressure sealing.