Bently Nevada 3300 XL 11mm Proximity Probe Part Number: 330707-00-20-10-02-00

Description

Bently Nevada 3300 XL 11mm Proximity Probe

Part Number: 330707-00-20-10-02-00

1. Product Introduction

The 330707-00-20-10-02-00 is a high-performance industrial sensor within the Bently Nevada 3300 XL 11mm Proximity Transducer series. It is a non-contact eddy current sensor designed to measure shaft vibration, position (radial and thrust), and speed. The 11mm probe offers a linear measurement range of 160 mils (4 mm), which is double that of the standard 8mm probe. This makes it the preferred choice for large steam turbines, hydro generators, and machines with significant journal bearing clearance or thermal growth.

330707-00-20-10-02-00

2. Main Technical Specifications

• Part Number Breakdown:
  • 330707: 3300 XL 11mm Proximity Probe.
  • 00: Probe Length Option (In this case, typically corresponds to a physical length of 0.5 meters / 19.5 inches between the probe tip and the connector).
  • 20: Total Electrical Length (TEL) of 2.0 meters. *Crucial: The system must be calibrated to this length.*
  • 10: Option/Approval Code (Indicates CSA and CENELEC/ATEX approvals for hazardous locations).
  • 02: Connector Style (Miniature Coaxial Click-Lok).
  • 00: Standard Seal/Arrangement.
• Physical Dimensions:
  • Probe Diameter: 0.433 inches (11 mm).
  • Tip Material: PPS (Polyphenylene Sulfide) – High temperature, chemical resistant.
  • Thread Size: Typically 3/4″-16 UNF (Standard for 11mm probes).
• Electrical Specifications:
  • Linear Range: 40 to 200 mils (1 to 5 mm gap). Total linear range = 160 mils (4 mm).
  • Sensitivity: 200 mV/mil (7.87 V/mm) @ 1 kHz across the linear range when paired with a 11mm Proximitor.
• Environmental Ratings:
  • Temperature: -51°C to +177°C (-60°F to +350°F).
  • Vibration: Withstands high machine vibration without signal degradation.

3. Typical Applications

The 11mm probe is selected for specific challenging environments where the 8mm probe’s range is insufficient:

• Steam Turbine Monitoring: Ideal for large industrial steam turbines where shaft eccentricity and differential expansion (expansion measurement) require wide ranges.
• Large Electric Motors & Generators: Monitoring on machines with large bearing clearances (hydro turbines).
• Axial Position (Thrust) Monitoring: Used on high-load thrust bearings where the rotor “floats” significantly.
• High-Temperature Zones: The rugged construction is suited for severe turbine environments.

4. Avoid Technical Pitfalls (Best Practices & Warnings)

• System Mixing Incompatibility: Do not mix 11mm probes with 8mm Proximitors or cables. The 11mm system requires a specifically matched 11mm Proximitor (e.g., 330180-50-00) and extension cable. Using an 8mm Proximitor will result in incorrect scaling and non-linear output.
• Total Electrical Length (TEL): The “20” in the part number indicates a 2.0-meter system length. You must connect this probe to an extension cable that, when added to the probe’s internal capacitance, results in a total system length of 2.0 meters. Using a cable intended for a 5.0m system will cause significant calibration errors.
• Thread Size Mismatch: Unlike the smaller 8mm probes (often 1/2-18 or 3/8-24), the 11mm probe (330707) typically uses a 3/4-16 UNF thread. Ensure the machine housing has been tapped for the larger thread size. Attempting to force this into a smaller hole will damage the machine or probe.
• Target Area Requirement: Due to the larger coil size (11mm), the probe requires a larger conductive target area (shaft surface). Ensure the shaft diameter is sufficiently large (minimum recommended target surface diameter is typically > 45mm / 1.8 inches) to avoid electrical “end-effect” errors.
• Side View Clearance: Maintain at least 1.5 times the probe diameter (approx. 17mm) of metal around the mounting hole sides.

5. Related Product Recommendations

• Matching Proximitor: Bently Nevada 330180-50-00 (11mm Proximitor, 2.0m system length).
• Matching Extension Cable: Bently Nevada 330716 series (varies based on length needed to complete the 2.0m total loop).
• Monitor Module: 3500/40M or 3500/42M (Configured for 11mm transducer input).
• Mounting Accessories: 125768-01 (Hex Nut for 3/4-16 thread) and 125768-02 (Lock Washer).
• Test Equipment: TK-3E (Ensure the 11mm adapter disc is used for calibration).