Description

The Bently Nevada 330101-12-30-10-02-05 is an 8 mm proximity probe engineered for precise, non-contact shaft vibration and displacement measurements in critical rotating machinery. As a key component of the Bently Nevada 3300 XL 8 mm Proximity Transducer System, this probe operates on the eddy-current principle to detect the static and dynamic distance between the probe tip and a conductive target, such as a machine shaft.

This specific variant features a 3/8-24 UNF thread profile without protective armor. It is configured with an unthreaded length of 1.2 inches (Option 12), an overall case length of 3.0 inches (Option 30), and a total length of 1.0 meter (3.3 feet) (Option 10). The cable is a standard non-armored design terminated with a miniature coaxial ClickLoc connector (Option 02) without an integrated connector protector. To ensure suitability for globally classified industrial zones, it is supplied with the 05 agency approval option, covering CSA, ATEX, and IECEx hazardous area standards.

In a standard machinery protection system, this probe connects to a 3300 XL extension cable and interfaces with a 330180-series Proximitor sensor. Together, they form a fully calibrated measuring chain that provides high-accuracy, linear output signals (typically 7.87 V/mm or 200 mV/mil) directly to Bently Nevada 3500 rack monitoring modules or other machinery protection systems.

Features

• Standard 8 mm tip diameter optimized for eddy-current displacement and vibration measurement.
• Custom mechanical configuration with 1.2 inches of unthreaded section and a 3.0-inch overall threaded case length.
• Standard non-armored coaxial cable terminated with a miniature gold-plated coaxial ClickLoc connector.
• Integrates seamlessly within the 3300 XL transducer chain with no calibration adjustments required when matching components.
• Robust PPS (polyphenylene sulfide) tip material and AISI 303 stainless steel body for high chemical and environmental resistance.
• Viton O-ring integrated to establish a reliable differential pressure seal between the probe tip and case.

Applications

Designed for permanent installations on critical rotating machinery, typical applications include:

• Radial shaft vibration measurement on steam and gas turbines.
• Axial shaft position and thrust displacement monitoring in high-pressure compressors and pumps.
• Rotor dynamic studies and machinery diagnostics.
• Continuous monitoring and over-speed protection on gearboxes, generators, and industrial fans.

Ordering Information

The Bently Nevada 330101 series allows custom-tailored probe dimensions, cable configurations, and safety ratings. The segment breakdown for this specific configuration is detailed below:

Technical Specifications

Installation Guidelines

To achieve reliable dynamic vibration measurements and maintain electrical safety, adhere to the following installation recommendations:

• Probe Gapping: Mount the probe with the appropriate mechanical offset gap (typically 1.27 mm or 50 mils) to center the signal in the linear range of the Proximitor sensor. Reference the system DC voltage calibration curve during gapping.
• Thread Engagement: Do not exceed the maximum thread engagement limits. For the 3/8-24 UNF thread, the maximum recommended length of thread engagement is 0.563 inches (14.3 mm) to avoid binding.
• Cable Routing: Route the coaxial cable through dedicated industrial conduit or cable trays to prevent mechanical damage. Avoid routing parallel to high-voltage power lines to minimize electromagnetic interference.
• Grounding: Ensure the sensor system is properly grounded. The shield of the field wiring should be connected to a single-point instrument ground, typically at the monitoring rack end, and left floating at the Proximitor sensor housing.
• Connector Protection: Since this option (02) does not include an integrated connector protector, ensure connection joints are wrapped with self-fusing silicone tape or housed in a junction box to exclude moisture and contaminants.

Compliance and Certifications

This specific configuration (Option 05) complies with global hazardous area requirements:

• ATEX/IECEx: Certified for use in Zone 0, 1, and 2 hazardous locations (Ex ia IIC T5...T1 Ga, Ex ia IIIC T90 degC...T280 degC Dc, Ex nA IIC T5...T1 Gc, Ex ec IIC T5...T1 Gc).
• CSA: Approved for Class I, Division 1 and 2, Groups A, B, C, and D hazardous locations when installed per Bently Nevada drawing 141092 or 140979.
• Entity Parameters: Approved for intrinsically safe applications under parameters Ui = -28 V, Ii = 140 mA, Pi = 0.91 W, Ci = 1.5 nF, Li = 610 uH when connected to certified Proximitor circuits.