Product Overview
In the demanding world of industrial rotating machinery, accurate vibration monitoring is not optional—it is essential for preventing catastrophic failures and unplanned downtime. The Bently Nevada 146055-20-02-05 represents a precision-engineered solution within the trusted 3300 series, specifically designed as a Ceramic Capped Reverse Mount Probe. This configuration, identified by Option: 0 2=, delivers the measurement fidelity that maintenance and reliability engineers depend on for protecting critical assets like turbines, compressors, and pumps.
Technical Specifications Breakdown
The 146055-20-02-05 probe features a 3/8-24 UNF thread case made from AISI 304 stainless steel, ensuring robust mechanical integrity in harsh environments. The probe tip is constructed from alumina ceramic (Al2O3), providing excellent wear resistance and electrical insulation. With a total length of 2.0 meters (6.6 feet), it includes a standard 75 Ω coaxial cable insulated with fluoroethylene propylene (FEP). The connector is a Miniature ClickLoc coaxial type, offering secure and quick installation.
Key electrical performance includes a nominal DC resistance of 7.88 ± 0.50 ohms measured from center conductor to outer conductor. The linear range extends 1.52 mm (60 mils), beginning at approximately 0.25 mm (10 mils) from the target, corresponding to an output of –4 to –16 Vdc. The incremental scale factor (ISF) is 7.87 V/mm (200 mV/mil) ±6.5% over the full linear range, ensuring precise displacement measurement.
Industry Applications
This probe excels in monitoring radial vibration and axial position of rotating shafts in high-speed machinery. Typical applications include steam turbines, gas turbines, centrifugal compressors, and large electric motors where bearing health is critical. The reverse mount design allows installation in confined spaces where standard probes cannot fit, making it ideal for retrofitting older machinery or upgrading existing monitoring systems.
Installation & Setup Guidance
Proper installation is vital for accurate readings. Mount the probe so that the sensing tip is perpendicular to the target surface. The maximum thread engagement length is 0.563 inches—do not exceed this to avoid mechanical interference. Use the supplied Miniature ClickLoc connector to attach the extension cable, ensuring a firm click is heard. Verify the gap between probe tip and target falls within the linear range (0.25 to 1.78 mm) using a feeler gauge or oscilloscope. For best results, calibrate the system with an AISI 4140 steel target as specified by the manufacturer.
Maintenance & Reliability
The 3300 series probes are designed for long-term reliability with minimal maintenance. The alumina ceramic tip resists wear from continuous contact with rotating shafts. The FEP-insulated cable withstands temperatures from -51°C to +177°C, making it suitable for extreme environments. Regularly inspect the cable for cuts or abrasion, and verify connector integrity. The probe is rated to seal 34 Bar (500 psi) nitrogen, ensuring performance in pressurized applications. For higher pressure requirements, contact the custom design department.
Compatibility & Integration
This probe is part of the 3300 XL system and is fully compatible with Bently Nevada Proximitor sensors and extension cables. It works seamlessly with Bently Nevada monitoring systems such as the 3500 and 3300 racks. The standard 5-meter or 9-meter system configuration maintains the specified ISF accuracy. The multiple approvals option (Agency Approval Option: -05) ensures compliance with various international standards, simplifying global deployment.
Selection Guide & Purchasing Advice
When ordering the 146055-20-02-05, verify that the total length option (-20 = 2.0 meters) and connector type (Miniature ClickLoc coaxial) match your system requirements. The agency approval option -05 provides multiple certifications, suitable for diverse regulatory environments. SpareTechPLC offers this probe as new and original in factory packing with a 12-month warranty. Please verify current lifecycle status and availability with SpareTechPLC before ordering to ensure timely delivery for your project.
Frequently Asked Questions
Q1: What is the maximum thread engagement length for the 146055-20-02-05?
A: The maximum length of thread engagement is 0.563 inches. Exceeding this may cause mechanical damage.
Q2: What is the linear range of this probe?
A: The linear range is 1.52 mm (60 mils), from 0.25 mm to 1.78 mm (10 to 70 mils) from the target.
Q3: Can this probe be used in high-pressure environments?
A: Yes, it is rated to seal 34 Bar (500 psi) nitrogen. For higher pressures, contact the custom design department.
Q4: What is the incremental scale factor (ISF) of the 146055-20-02-05?
A: The ISF is 7.87 V/mm (200 mV/mil) ±6.5% over the linear range, including interchangeability error.
Q5: What is the operating temperature range for this probe?
A: The operating and storage temperature range is -51°C to +177°C (-60°F to +351°F).
