Applications

Competitive Advantage

• Integrated design: Combines probe and Proximitor sensor in one unit, eliminating the need for a separate housing and reducing system complexity.

• No extension cable required: Direct connection between probe and monitoring system simplifies installation and reduces potential signal loss.

• Rugged PPS housing: Made of advanced thermoplastic with reinforced fibers for improved strength and electrostatic discharge protection.

• Harsh environment rating: Type 4X and IP66 protection ensures reliable performance in demanding industrial and outdoor conditions.

System Compatibility, Alternative Models, and Differences

• System Compatibility:
  Fully compatible with Bently Nevada machinery monitoring systems (such as the 3500 Series Monitor System) via direct 3-conductor shielded field wiring. The internal probe is fully compliant with API 670 standards.
• Alternative Model (English Unit Equivalent):
  330880-16-40-043-06-02 (PROXPAC XL English Series)
• Key Differences between 330881 (Metric) and 330880 (English):

Dimension Unit Bases: The 330881 uses metric increments for ordering (10mm steps for standoff, 1mm steps for penetration), whereas the 330880 relies on English increments (0.5-inch steps for standoff, 0.1-inch steps for penetration).

Standoff & Penetration Matching: The 330881 model provides a precise 100mm standoff adapter and 110mm penetration sleeve. The closest English 330880 counterpart uses a 4.0-inch (101.6mm) standoff adapter and a 4.3-inch (109.2mm) penetration sleeve options.

Mechanical Hardware Components: The metric 330881 features metric wrench flats (35mm) on its standoff adapter, whereas the English 330880 utilizes standard fractional hex sizes (1-3/8 inch).

Conduit Connection Kit: Option D=06 supplies a metric-tailored kit featuring a 3/4-14 NPT fitting paired with a 3/4-14 NPT to 1/2-14 NPT stainless steel reducer, accommodating specific localized cable routing preferences.

Ordering Information

Installation & Troubleshooting FAQ

Q1: What is the recommended gap setting and initial calibration voltage for this PROXPAC XL assembly?

A: The recommended physical gap setting is 1.27 mm (50 mils). This matches the center of the sensor's 2.0 mm (80 mils) linear range. At this position, the nominal system output voltage should read approximately -10.0 VDC when measured across the monitor terminals.

Q2: Does this model require a separate extension cable between the probe and Proximitor sensor?

A: No. The PROXPAC XL housing design integrates the 3300 XL Proximitor sensor directly into the housing cover. The 1-meter probe cable coils safely inside, eliminating the need for a separate external extension cable and reducing junction vulnerability.

Q3: What precautions must be taken due to the total extended sleeve length (B + C dimensions)?

A: The combined Standoff Adapter (B = 100mm) and Probe Penetration (C = 110mm) equals 210 mm. Since this total is under 305 mm (12.0 inches), it does not strictly require an additional external sleeve support to prevent resonance, but the sleeve locknut must be torqued to 39.3 N·m (350 in·lb) to keep the assembly stiff and secure.

Q4: The signal is fluctuating during steam venting or ambient washdowns. How can I resolve this?

A: While the PPS thermoplastic housing holds a Type 4X and IP66 rating against hose-directed water, long-term exposure to hot water or condensing steam above 95°C can weaken the housing over time. Check the conduit entry. Ensure that it is properly sealed with a waterproof connection so that moisture cannot travel down the hardline piping directly into the enclosure.

Q5: What should I do if a chemical process fluid leaks past the probe tip into the housing assembly?

A: The internal probe case uses a Viton O-ring and a Neoprene sleeve O-ring to contain fluid differentials. However, high or low pH process solutions can erode the probe tip. If a leak occurs, the user must contain and control the escaping fluids. Note that Bently Nevada does not cover transducer replacement under service plans due to probe leakage caused by chemical erosion.

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