Robust Axial Displacement Sensing

The Bently Nevada 330701-00-25-10-11-05 11mm Proximity Probe provides an extended measurement range essential for monitoring large-scale rotating machinery. Specifically designed for applications where standard 8mm probes lack sufficient linear range, this 11mm sensor excels in tracking axial thrust position and radial vibration in massive steam turbines, centrifugal compressors, and generators. Its primary value lies in its ability to deliver stable, non-contacting displacement data despite significant thermal expansion or shaft movement. By feeding high-precision signals into the Bently Nevada 3500 series machinery protection system, this probe ensures critical assets remain within safety envelopes, preventing catastrophic failures through reliable emergency shutdown (ESD) data.

Model Suffix & Configuration Logic

330701 - 3300 XL 11mm Probe

Identifies the specialized 11mm tip diameter sensor, featuring a 1/2-20 UNF threaded body designed for an extended linear range of 4.0 mm (160 mils).

00 - Unthreaded Length (Dimension A)

Specifies a 0.0 mm (0.0 inch) unthreaded length. The entire probe body features precision threads, offering maximum flexibility for mounting within standard or custom brackets.

25 - Overall Case Length (Dimension B)

Designates a 2.5 inch (64 mm) threaded case length. This provides sufficient reach for most bearing housings while maintaining structural rigidity.

10 - Total Length Option

Indicates a 1.0 meter (3.3 feet) integrated probe lead. This lead must be paired with the appropriate extension cable to achieve a total system length of 5.0m or 9.0m for correct capacitance matching.

11 - Connector and Cable Option

Equipped with a miniature coaxial ClickLoc connector and standard cable. The ClickLoc design ensures a moisture-resistant, robust electrical bond that withstands the high-frequency vibrations found in power generation halls.

05 - Agency Approval Option

Confirms multiple global hazardous area certifications, including ATEX, IECEx, and CSA approvals. This allows for safe installation in Class I, Division 1 and 2 environments globally.

Mechanical and Performance Specifications

Field Commissioning & Routing Guide

Precision gapping is critical to utilize the full 160-mil linear range of the 11mm system. Engineers must monitor the DC bias voltage at the Proximitor output during installation; the probe position is typically adjusted until the voltage reads -10.0 VDC, centering the sensor within its window. Given the 1/2-20 UNF thread, use a calibrated torque wrench to ensure the lock nut is secured without over-stressing the housing. Always maintain a minimum bend radius of 25.4 mm (1.0 inch) for the coaxial cable and ensure the ClickLoc connector is kept free of oil and moisture to prevent signal attenuation or "Not OK" status indications.

Engineering Performance Advantages

The 330701nd-00-25-10-11-05 is built for the harshest industrial climates. Its PPS tip is hermetically sealed against oil, steam, and aggressive chemical vapors, ensuring long-term calibration stability. This 11mm probe integrates natively with Bently Nevada 3500/40M or 3500/42M modules, providing the high-resolution data stream required for Turbine Supervisory Instrumentation (TSI). Its extended range makes it the superior choice for thrust position monitoring, where shaft axial movement during startup transients would exceed the limits of smaller sensors, ensuring continuous protection throughout the entire machine speed range.

Global Logistics & Fulfillment

Delivery time: 3-5 days when payment finish, BY DHL/FEDEX/UPS.

All proximity probes are shipped in anti-static industrial packaging. We include protective caps on all ClickLoc connectors and tip sleeves to ensure the sensor arrives in factory-calibrated condition, ready for immediate field deployment.

Technical Support FAQs

Q1: Why is the sensitivity of this probe 100 mV/mil instead of 200 mV/mil?

A1: The 11mm probe is designed for an extended range (160 mils). To accommodate this wider window within the standard voltage output of the Proximitor, the scale factor is adjusted to 100 mV/mil. Ensure your monitor software reflects this scale factor.

Q2: Can I use this 1.0m probe with a standard 3300 XL 8mm Proximitor?

A2: No. The 11mm probe requires a dedicated 11mm Proximitor. The internal electronics of the 8mm and 11mm Proximitors are calibrated differently to match the tip diameter and target surface area.

Q3: How do I identify a faulty connector in the field?

A3: If the 3500 monitor shows a "Not OK" status or the DC voltage jumps to the supply rail, inspect the ClickLoc connector for moisture or loose mating. A properly mated ClickLoc should provide a stable, low-impedance path for the high-frequency eddy current signal.