Bently Nevada 330851 25mm Probe 330851-02-000-060-10-00-CN

Product Overview

The Bently Nevada 330851-02-000-060-10-00-CN is a heavy-duty 25mm proximity probe from the 3300 XL series, engineered for maximum survivability in extreme steam turbine environments. Made in the U.S.A., this non-contacting sensor provides high-accuracy displacement and vibration data for large-scale rotating machinery. It is designed to physically replace standard 7200-series 25mm and 35mm systems, offering superior thermal stability and resistance to harsh industrial fluids. The "CN" approval ensures compliance with regional safety and regulatory standards for critical infrastructure projects.

Technical Configuration

This 330851 model is configured for robust performance without external armor:

• Full Model: 330851-02-000-060-10-00-CN
• Probe Case Type (02): M30x2 metric thread for high-torque secure mounting.
• Unthreaded Length (000): 0 in; the entire 60mm case is threaded for precise gap adjustment.
• Overall Case Length (060): 60mm AISI 304 stainless steel body.
• Total Length (10): 1.0 meter (3.3 feet) integrated triaxial cable.
• Armor Option (00): No Armor; utilizes standard PFA-insulated FluidLoc cable for flexibility.
• Agency Approval (CN): Country-specific certification for localized industrial compliance.

Technical Specifications

Installation & Maintenance

Achieving the correct torque is vital for the long-term reliability of the 330851-02-000-060-10-00-CN. For the M30x2 threaded case, a recommended installation torque of 68 N•m (50 ft•lb) should be applied, with a maximum limit of 163 N•m. The FluidLoc cable technology is designed to block oil or other fluids from wicking through the cable into the Proximitor sensor. During installation, avoid exceeding the cable's bend radius to maintain the integrity of the triaxial shielding.

Engineering Advantages

The primary advantage of the 330851 series is its extreme temperature resilience. The PEEK tip and 304 SST case allow the probe to maintain measurement accuracy in steam-heavy environments up to 200°C. Furthermore, its broad compatibility allows for a seamless mechanical upgrade from legacy 7200-series 25mm and 35mm transducers without needing to modify existing bearing housings. This model complies with major maritime (ABS) and EMC standards, ensuring interference-free operation near high-power electrical equipment.

Technical FAQs

Q1: What is the benefit of the "No Armor" (00) option for this probe?
A1: The no-armor version is lighter (230g) and offers greater cable flexibility, which is often preferred for installations within tight conduits or where mechanical abrasion is not a primary risk.

Q2: Can this probe handle intermittent steam bursts beyond its operating range?
A2: Yes. The 330851 is rated to withstand "short term" exposure up to 250°C (482°F) for durations of less than 24 hours without permanent damage or calibration drift.

Q3: Is this probe intrinsically safe for hazardous locations?
A3: Yes, when installed with approved zener barriers or galvanic isolators per Bently Nevada drawing 141092, it meets Class I, Zone 0 (AEx/Ex ia IIC) requirements.