Bently Nevada 330908-39-71-05-01-00 3300 NSv Proximity Probe

Description

Option 39 (3.9 in unthreaded length) and Option 71 (7.1 in case length) specify this unarmored 3/8-24 UNF threaded proximity probe configuration — 330908-39-71-05-01-00. This 3300 NSv proximity probe is used for applications with small target areas or restricted mounting spaces where standard 5 mm or 8 mm proximity systems cannot operate effectively. It pairs with a 3300 XL NSv Proximitor Sensor and a 330930 extension cable to form a complete eddy-current measurement system.

This specific configuration lacks stainless steel armor and features a 0.5-meter (20 inches) total length (Option 05). It is equipped with a miniature coaxial ClickLoc connector with an integrated fluorosilicone connector protector (Option 01). No hazardous area agency approvals are required for this model (Option 00), making it suitable for standard safe-area installations.

Features

• Thread option of 3/8-24 UNF-2A with a 7.1-inch overall case length (Option 71) and 3.9-inch unthreaded portion (Option 39) for precise depth adjustment.
• Total probe length of 0.5 meters (20 inches) (Option 05) to connect directly to an extension cable.
• Miniature coaxial ClickLoc connector featuring an integrated fluorosilicone connector protector (Option 01) to shield the connection from fluid and environmental ingress.
• Standard 75-ohm coaxial cable insulated with fluoroethylene propylene (FEP) without stainless steel armor protection.
• Engineered for narrow targets, enabling non-contact static and dynamic measurements on shafts down to 13 mm (0.5 in) for axial position or 20 mm (0.8 in) for radial vibration.

Applications

• Radial vibration and axial position monitoring on high-speed rotating machinery with tight installation clearances.
• Fluid-film bearing measurements in aeroderivative gas turbines, centrifugal compressors, and small-bore pumps.
• Applications requiring high-density spatial configuration where cross-talk must be minimized between adjacent probes.

Ordering Information

Technical Specifications

Installation Guidelines

Ensure the following practices are followed during installation:

• Maintain a minimum probe tip separation of 25 mm (1.0 in) for axial measurements or 23 mm (0.9 in) for radial vibration measurements to prevent field cross-talk.
• Ensure the maximum thread engagement does not exceed 0.563 inches (14.3 mm) to avoid binding during assembly.
• Use a 3/8-24 UNF-2A matched thread hole and torque to a recommended 11.3 N-m (100 in-lb), never exceeding the maximum limit of 33.9 N-m (300 in-lb).
• Isolate the matched Proximitor Sensor from the housing ground using a mounting pad to prevent electrical interference.
• Slide the integrated fluorosilicone connector protector securely over the probe-to-extension cable junction to guard against fluid contamination.

Compliance and Certifications

The 3300 XL NSv system complies with the following standards when appropriately matched with corresponding system components:

• EMC Directive: 2014/30/EU (EN 61000-6-2 and EN 61000-6-4)
• RoHS Directive: 2011/65/EU
• Functional Safety: SIL 2 certified (Hardware Fault Tolerance HFT = 0), SIL 3 capable (Hardware Fault Tolerance HFT = 1)
• China RoHS: EFUP designation of 15 years in accordance with SJ/T 11364-2024