This armored 8 mm proximity probe is primarily used for radial vibration, axial position, and Keyphasor reference measurements on fluid-film bearing machines such as steam turbines, compressors, and pumps. It is ideal for applications requiring rugged probe construction and full interchangeability without bench calibration, meeting API 670 standards for mechanical configuration and temperature stability.

System Compatibility & Alternative Models

• System Compatibility: Fully compatible with Bently Nevada 3300 XL Proximitor Sensors and 3300 XL Extension Cables. It is completely interchangeable with non-XL 3300 series 5mm and 8mm transducer system components and fully complies with API 670 standards.
• Alternative Model: 330101-00-20-05-02-00
• Key Differences: The 330102-00-20-05-02-00 model comes equipped with a flexible AISI 302 or 304 stainless steel armor sleeve with an outer FEP jacket over its leading cable to safeguard against physical impact, abrasion, and tear hazards. Conversely, the 330101-00-20-05-02-00 is an unarmored model variant that features a bare triaxial FEP jacket, making it lighter and optimized exclusively for installations inside protected conduit paths.

Ordering Information

Installation & Troubleshooting FAQ

Q1: What is the correct gap voltage for setting up this 3300 XL 8mm proximity probe?
A: For a standard 3300 XL 8mm proximity transducer system calibrated to AISI 4140 steel, the correct initial calibration voltage is -10.0 VDC. This voltage corresponds to the physical midpoint of the sensor's 2.0 mm (80 mils) linear range. To set this up in the field, connect a digital multimeter to the Proximitor sensor's OUT and COM terminals, then slowly rotate the probe into the mounting thread until the multimeter reads -10.0 VDC before tightening the locknut.

Q2: What is the recommended torque specification for installing this 3/8-24 UNF standard forward-mounted probe?
A: When installing this standard forward-mounted probe case into its tapped bracket, the recommended field torque is 11.2 N·m (100 in·lbf), and you must never exceed the absolute maximum rated limit of 33.9 N·m (300 in·lbf). Overtightening can permanently bind the threads or cause mechanical fracturing of the internal electronics housed within the molded polyphenylene sulfide (PPS) tip assembly.

Q3: My proximity sensor signal glitches or drifts during heavy rain or oil washdowns. How can I fix this?
A: This issue points directly to moisture ingress or oil mist contamination inside the coaxial ClickLoc connectors. The golden connection junction between the probe leading cable and the extension cable is highly vulnerable to conductive fluids. To fix and permanently prevent this, always utilize the original Bently Nevada silicone connector protectors, or tightly seal the junction using self-fusing waterproof rubber tape wrapped with an outer layer of electrical PVC tape. Note that silicone tape is not recommended if the connection is exposed directly to turbine oil.

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