Bently Nevada 330105-02-12-20-12-05 3300 XL 8mm Probe

Bently Nevada 330105-02-12-20-12-05 3300 XL 8mm Reverse Mount Probe

Product Introduction

The Bently Nevada 330105-02-12-20-12-05 is a precision-engineered reverse mount probe from the 3300 XL 8 mm series. This probe features 3/8-24 UNF threads and a 2.0-meter (6.6 feet) total length. It incorporates a miniature ClickLoc coaxial connector with FluidLoc cable option, providing secure connections and oil-leak prevention. The probe tip uses robust Polyphenylene sulfide (PPS) material, while the case utilizes AISI 303 or 304 stainless steel. With CSA, ATEX, and IECEx approvals, this probe suits demanding turbomachinery monitoring applications in hazardous environments. Manufactured in the U.S.A., it delivers reliable, accurate measurements for critical asset protection.

Technical Specifications & Performance

The 330105-02-12-20-12-05 offers precise electrical characteristics for accurate proximity measurements. Its nominal DC resistance from center conductor to outer conductor measures 7.88 ± 0.50 Ω (highlighted in red) for the 2.0-meter length. This consistent resistance ensures reliable signal transmission between the probe tip and the Proximitor sensor. The probe cable uses 75 Ω triaxial FEP insulation, providing excellent shielding against electrical noise and interference. The system's linear range spans 1.5 mm (60 mils) with a recommended gap setting of 1.0 mm (40 mils), ensuring optimal measurement sensitivity for most turbomachinery applications.

Design Features and Construction

This 3300 XL 8 mm reverse mount probe incorporates several patented design features that enhance its reliability. The TipLoc molding method creates a robust bond between the probe tip and the probe body, preventing separation under mechanical stress. Additionally, the CableLoc design securely attaches the probe cable to the probe tip, providing 330 N (75 lbf) pull strength (highlighted in red) . The probe case features 3/8-24 UNF threads with a maximum thread engagement length of 0.563 inches. The miniature ClickLoc connector locks firmly into place, preventing loosening from vibration commonly found in rotating machinery applications.

FluidLoc Cable Option Consideration

The 330105-02-12-20-12-05 includes the FluidLoc cable option, indicated by the "12" in the connector option field. This option prevents oil and other liquids from leaking through the cable interior. However, Bently Nevada notes that the FluidLoc option is not necessary on the vast majority of 330105 and 330106 installations due to the presence of the probe sleeve. Therefore, consider your application carefully before ordering this option. For most standard installations, the standard cable provides adequate sealing. The FluidLoc option becomes essential only when the probe-to-extension cable connection faces direct exposure to oil or process fluids.

Agency Approvals and Certifications

This probe carries the "05" agency approval option, which includes CSA, ATEX, and IECEx approvals (highlighted in red) . These certifications confirm the probe's suitability for installation in potentially explosive atmospheres. The probe meets rigorous international standards for hazardous area equipment, providing peace of mind for safety-critical applications. For EPL Ga and Gc environments, the probe offers various temperature classifications from T1 through T5, accommodating ambient temperatures from -55°C up to +232°C depending on the classification. This flexibility makes the Bently Nevada 330105-02-12-20-12-05 suitable for a wide range of global installations.

Mechanical Properties and Temperature Range

The probe's material construction ensures durability in harsh industrial environments. The PPS probe tip offers excellent chemical resistance and dimensional stability at elevated temperatures. The AISI 303 or 304 stainless steel case provides corrosion resistance and mechanical strength. The standard probe operates across -52°C to +177°C (-62°F to +350°F) (highlighted in red) . For more demanding applications, an extended temperature range probe is available, supporting tip temperatures up to +218°C (+425°F). Note that exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal. The probe also withstands high humidity environments, with less than 3% change in Average Scale Factor after 56 days at 93% humidity per IEC 68-2-3.

Installation Guidelines

Installing the Bently Nevada 330105-02-12-20-12-05 requires attention to several important factors. First, always power down the system before making any connections. Next, ensure the mounting surface provides proper thread engagement for the 3/8-24 UNF threads. The recommended maximum thread engagement length is 0.563 inches for optimal performance. Then, connect the miniature ClickLoc coaxial connector to the extension cable, ensuring it locks securely into place with an audible click. When routing the probe cable, avoid sharp bends and maintain adequate clearance from rotating parts. Finally, set the probe gap to the recommended value of 1.0 mm (40 mils) (highlighted in red) for optimal linearity. For fluid-containing applications, verify the Viton O-ring seal provides adequate differential pressure sealing between the probe tip and case.

Packaging List

• 1 x Bently Nevada 330105-02-12-20-12-05 3300 XL 8 mm Reverse Mount Probe (2.0m)

• 1 x Locknut with pre-drilled safety wire holes

• 1 x Set of Installation Instructions

Shipping Method: Orders are shipped via FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

Q1: What is the length of the Bently Nevada 330105-02-12-20-12-05?
A1: The "20" total length option signifies 2.0 meters (6.6 feet) for this 3300 XL 8 mm reverse mount probe.

Q2: What approvals does this 3300 XL probe carry?
A2: The "05" agency approval option includes CSA, ATEX, and IECEx approvals for hazardous area installations.

Q3: Is the FluidLoc option necessary for this Bently Nevada probe?
A3: Bently Nevada notes that FluidLoc is not necessary on most 330105 installations due to the probe sleeve. Consider your application before ordering this option.

Q4: What is the pull strength rating for this probe?
A4: The CableLoc design provides 330 N (75 lbf) pull strength at the probe case to probe lead connection.

Q5: What temperature range does this probe support?
A5: The standard probe operates between -52°C and +177°C (-62°F to +350°F). Extended temperature range versions are available upon request.