Product Overview

The Bently Nevada 330105-02-12-90-02-05 represents the pinnacle of eddy current sensing technology, specifically designed for the 3300 XL 8mm Proximity Transducer System. This reverse mount probe acts as the critical sensory interface for your Turbine Supervisory Instrumentation (TSI), capturing sub-micron variations in shaft displacement and vibration without physical contact.

Engineered for the rigorous environments of steam turbines, centrifugal compressors, and high-speed motors, this probe translates physical gap changes into a precise proportional voltage. This data allows maintenance teams to identify early-stage bearing wear, rotor instability, or misalignment before catastrophic failure occurs. The reverse mount configuration facilitates specialized installation through machine casings where external mounting is impractical, providing a robust solution for complex mechanical geometries.

Technical Configuration

As a specialist in Bently Nevada systems, I have decoded the specific configuration for the 330105-02-12-90-02-05 model to ensure it matches your engineering requirements:

Unthreaded Length Option (-02)

This specifies a 2.0-inch unthreaded length, providing the necessary smooth shank for specific mounting brackets or through-casing clearances.

Overall Case Length Option (-12)

The 1.2-inch total case length ensures a compact profile, ideal for internal mounting where the envelope between the machine shell and the shaft is highly restricted.

Total Length Option (-90)

This indicates a 9.0-meter (approx. 29.5 feet) total length. Unlike shorter probes that require an extension cable, this 9m version is designed to connect directly from the probe location to the Proximitor sensor, minimizing connection points.

Connector and Cable Option (-02)

Features the Miniature ClickLoc™ coaxial connector and standard unarmored cable. The ClickLoc system provides a secure, vibration-resistant connection that "clicks" to confirm a positive lock.

Agency Approval Option (-05)

Includes Multiple Approvals (CSA, ATEX, IECEx), certifying the probe for use in North American and International hazardous areas, including Zone 0, 1, and 2 environments.

Technical Specifications

Engineering Installation & Maintenance Guide

Setting the Gap Voltage

Successful monitoring starts with the mechanical gap. For the 3300 XL 8mm system, engineers should set the probe gap to a -10.0 VDC bias (the midpoint of the -1.0V to -17.0V linear range). Use a digital multimeter at the Proximitor’s "OUT" and "COM" terminals to verify this voltage before finalizing the mounting torque.

Cable Protection and Bend Radius

Even with the high-durability fluoropolymer-insulated cable, you must maintain a minimum bend radius of 25.4 mm (1.0 in). Avoid routing cables in the same conduit as high-voltage AC lines to prevent electromagnetic interference from distorting your vibration data.

Connector Maintenance

ClickLoc™ connectors are sensitive to moisture and oil. I strongly recommend using connector protectors or oil-resistant heat-shrink tubing in oil-mist environments to prevent signal attenuation or "grounding out" of the high-frequency signal.

Engineering Advantages

The 330105 series excels where generic sensors fail. Its Polyphenylene Sulfide (PPS) tip is chemically bonded to the probe body, preventing tip detachment in high-pressure or high-flow environments. This probe offers complete interchangeability; you can swap the probe or Proximitor from any 3300 XL series without tedious bench recalibration. This "plug-and-play" capability reduces Mean Time To Repair (MTTR) and ensures your critical assets remain under continuous protection.

Delivery and Logistics

We prioritize speed and safety to minimize your facility's downtime.

Delivery Time: 3-5 business days after payment confirmation.

Shipping Partners: Worldwide express shipping via DHL, FEDEX, or UPS.

Safety: All probes ship in Anti-Static (ESD) protective packaging within reinforced industrial boxes to ensure they arrive in factory-calibrated condition.

Technical FAQs

Q1: How do I verify if the 330105 probe is faulty using a Multimeter?

A1: Perform a resistance check between the center conductor and the outer shield of the ClickLoc connector. A healthy 9.0m probe should show a resistance between 7.0 to 11.0 ohms. An infinite (OL) reading indicates an open circuit, while very low resistance suggests a short.

Q2: What is the benefit of the "Reverse Mount" design?

A2: Unlike standard probes that thread in from the outside, reverse mount probes are designed for installation from the inside of a bearing housing or bracket. This is essential for machines where external access is blocked by structural components.

Q3: Can I use this probe with an older 3300 (non-XL) Proximitor?

A3: Yes. The 3300 XL 8mm probe is backward compatible with non-XL 3300 5mm and 8mm systems, allowing for a staged upgrade of your instrumentation.

Q4: Does the -90 total length include the probe cable?

A4: Yes. The -90 suffix indicates the entire length from the probe tip to the connector is 9.0 meters. This configuration is specifically chosen to eliminate the need for an intermediate extension cable.