Bently Nevada 330708-00-20-50-02-05 3300 XL 11 mm Proximity Probe

Description

Option 00 (0.0 in unthreaded length) and Option 20 (2.0 in overall case length) specify this 3300 XL 11 mm Proximity Probe configuration — 330708-00-20-50-02-05. This armored probe under base model 330708 features a 5/8-18 UNF-2A thread, 5.0 m integrated cable (Option 50), standard ClickLoc coaxial connector (Option 02), and multiple agency approvals (Option 05). The transducer system is designed to provide non-contacting vibration and displacement measurements on machines with fluid film bearings, offering a longer linear range than standard 8 mm probes.

Unlike unarmored versions in the same family, this model features flexible AISI 302 stainless steel armor with an FEP outer jacket over the coaxial cable to deliver high mechanical resistance to cutting and wear in harsh industrial monitoring environments. The integrated 5.0 m total length allows the probe to connect directly to a 5.0-meter Proximitor Sensor without requiring a separate extension cable, minimizing electrical connections and simplifying the installation layout.

Features

• Flexible Stainless Steel Armor: AISI 302 stainless steel armor with an FEP outer jacket protects the triaxial cable from physical damage and environmental contamination.
• Threaded Steel Housing: Robust AISI 304 stainless steel case with 5/8-18 UNF-2A threads, fully threaded (0.0 in unthreaded length) and a 2.0 in case length.
• Gold-Plated ClickLoc Connector: Option 02 designates a miniature coaxial male ClickLoc connector, providing a secure, positive-locking connection that resists loosening.
• 5.0 m Integrated Length: Option 50 specifies a 5.0-meter (16.4 ft) total probe length, calibrated to pair directly with a 5.0-meter Proximitor Sensor.
• Agency Approved: Option 05 equips the transducer with multiple international certifications (CSA, ATEX, IECEx) for intrinsically safe and non-incendive environments.

Applications

• Axial Thrust Position: Direct shaft displacement monitoring on large industrial gas and steam turbines.
• Ramp Differential Expansion: Relative thermal expansion measurements on steam turbine rotors.
• Reciprocating Compressors: Rod position and rod drop measurements on piston rods.
• Tachometer & Speed Measurement: Precise rotor speed and phase reference (Keyphasor) signal generation.

Ordering Information

Technical Specifications

Installation Guidelines

Proper installation of the 3300 XL 11 mm proximity probe is critical for measuring machinery vibration and axial displacement. Follow these engineering guidelines:

• Probe Thread and Case Torque: Secure the 5/8-18 threaded case using a matching nut. Ensure that thread engagement does not exceed 0.938 inches to prevent binding. Do not exceed the maximum rated torque of 45.2 N-m (400 in-lb); the recommended installation torque is 15.2 N-m (133 in-lb).
• Target Size Requirements: For full linear range calibration, use a flat target made of AISI 4140 steel with a minimum diameter of 30.5 mm (1.2 in).
• Cable and Armor Handling: Do not exceed the minimum bend radius of 25.4 mm (1.0 in) for the armored cable. Avoid routing the cable near high-voltage lines or sources of electrical noise.
• Connector Protection: Maintain a clean, dry connection. Although Option 02 does not include a pre-installed connector protector, ensure the miniature coaxial ClickLoc connection is wrapped with silicone tape or enclosed in a protective conduit if exposed to moisture, humidity, or turbine oil.

Compliance and Certifications

The 3300 XL 11 mm Proximity Probe is designed to comply with standard industrial regulations. Under Option 05, the transducer system qualifies for multiple agency approvals in hazardous areas:

• ATEX/IECEx: Intrinsically safe (Ex ia IIC T5...T1 Ga, Ex ia IIIC T90degC...T280degC Dc) and non-sparking/increased safety (Ex nA IIC T5...T1 Gc, Ex ec IIC T5...T1 Gc) when installed per drawings 141092 and 140979.
• North America (cNRTLus): Class I, Division 1, Groups A, B, C, D; Class II, Groups E, F, G; Class III. Class I, Division 2, Groups A, B, C, D; Class I, Zone 0, AEx/Ex ia IIC; Class I, Zone 2, AEx/Ex nA or ec IIC.
• Electromagnetic Compatibility (EMC): Complies with European Directive 2014/30/EU, standards EN 61000-6-2 (Immunity) and EN 61000-6-4 (Emissions) for industrial environments.
• RoHS: Complies with European Directive 2011/65/EU and China RoHS regulations.