The Long Linear Range That Handles Real Machine Movement

Standard proximity probes often lose accuracy when a rotor moves too far. The Bently Nevada 330707-00-20-10-11-00 is a 3300 XL 11 mm probe with a 4.0 mm linear range, starting at 0.5 mm and reaching 4.5 mm from the target. This long range is essential for fluid film bearing machines where axial thrust position can shift significantly. It is also the right choice for ramp differential expansion measurements on steam turbines and for rod position or rod drop monitoring on reciprocating compressors. The system outputs a clean 3.94 V/mm (100 mV/mil), so your 3500 monitoring rack gets a predictable signal without extra scaling. The 5/8-18 UNF thread and full armor on this specific model mean you are not just buying accuracy; you are buying a probe that survives high-vibration, high-temperature environments.

Armor, FluidLoc, and ClickLoc – No More Leaks or Loose Connections

The 330707-00-20-10-11-00 solves three common field headaches. First, the stainless steel armor protects the cable from crushing and abrasion when you pull it through tight casing openings. Second, the FluidLoc cable option (the “11” in the part number) prevents oil from wicking inside the cable and leaking out through the connector. If you have ever found turbine oil dripping from a junction box, you know why this matters. Third, the gold-plated brass ClickLoc connectors lock firmly into place and resist vibration loosening. The patented TiLoc molding gives the probe tip a 330 N pull strength, and the locknut comes with pre-drilled safety wire holes. A connector protector is also included to seal out humidity. With a probe temperature range from -52°C to +177°C, this unit keeps working whether you install it on a desert compressor or a northern steam turbine.

One Probe for Vibration, Thrust, Speed, and Phase Reference

This single probe can replace multiple sensors. It works as a radial vibration monitor for larger shafts, an axial position sensor for thrust monitoring, and a tachometer or zero-speed sensor. When you need to confirm a machine has completely stopped before engaging a turning gear, the probe’s output remains stable down to zero speed. It also serves as a Keyphasor source, providing a once-per-turn phase reference signal that other 3500 series vibration modules need for orbit plots and balancing calculations. If you are upgrading from an older 7200 series 11 mm or 14 mm system, this probe is the direct replacement. Every component must be changed to the 3300 XL series, and the 3500 monitoring system recognizes this probe as compatible with the latest configuration software. By using this one probe across multiple applications, you reduce spare parts, simplify wiring, and make maintenance more straightforward.

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