Introduction
When vibration monitoring systems fail to deliver accurate displacement readings, machinery protection becomes unreliable. The Bently Nevada 146055-05-02-00 3300 Ceramic Capped Reverse Mount Probe addresses this challenge directly. Designed for precision measurement in harsh environments, this probe offers a robust solution for rotating machinery monitoring.
Technical Specifications Breakdown
The 146055-05-02-00 operates within a linear range of 1.52 mm (60 mils), starting at approximately 0.25 mm (10 mils) from the target. This range extends from 0.25 to 1.78 mm (10 to 70 mils), corresponding to approximately –4 to –16 Vdc output. The incremental scale factor (ISF) for a standard 5-meter or 9-meter system is 7.87 V/mm (200 mV/mil) ±6.5% including interchangeability error, measured in 0.25 mm (10 mil) increments over the full linear range at 0°C to +45°C (+32°F to +113°F).
Probe Construction
The probe tip is made of alumina ceramic (Al2O3), while the case uses AISI 304 stainless steel. The probe case thread is 3/8-24, with a maximum thread engagement length of 0.563 inches. The total length option is 0.5 meter (1.6 feet), and the probe cable is 75 Ω coaxial, fluoroethylene propylene (FEP) insulated. The connector is a miniature ClickLoc coaxial connector with standard cable.
Environmental Ratings
The probe operates and stores in temperatures from -51°C to +177°C (-60°F to +351°F). It is rated to seal 34 Bar (500 psi) nitrogen. The temperature schedule includes classifications for EPL Ga and Gc (T1 through T5) and EPL Dc (multiple temperature ratings). The nominal DC resistance from center conductor to outer conductor is 7.45 ± 0.50 ohms for the 0.5 meter probe length.
Industry Applications
This probe excels in monitoring radial vibration and shaft position in turbines, compressors, pumps, and other rotating equipment. The ceramic tip resists wear and contamination, making it suitable for high-speed or abrasive environments. The reverse mount design simplifies installation in confined spaces, reducing downtime during sensor replacement.
Installation & Setup Guidance
Proper installation begins with verifying the probe gap within the linear range. The gap voltage should be set between –4 and –16 Vdc with the target at rest. Ensure the probe tip is clean and free of debris before mounting. Use the 3/8-24 thread to secure the probe, and do not exceed the maximum thread engagement of 0.563 inches. Connect the miniature ClickLoc coaxial connector to the extension cable, ensuring a firm click.
Maintenance & Reliability
Regularly inspect the probe cable for cuts or abrasions, especially near the connector. The FEP insulation resists chemicals and high temperatures, but physical damage can compromise signal integrity. Check the probe tip for ceramic cracks or wear. The probe's pressure seal is rated to 34 Bar (500 psi) nitrogen; if higher pressure is needed, contact the manufacturer. Periodic calibration verification against a known target ensures continued accuracy.
Compatibility & Integration
The 146055-05-02-00 is part of the 3300 5 mm system, which includes a Proximitor sensor and extension cable. It works with standard 5-meter or 9-meter system lengths. The system performance specifications apply when using AISI 4140 steel target and a -24 Vdc power supply with a 10 kW load. The probe is compatible with Bently Nevada monitoring systems that accept 5 mm proximity probe inputs.
Selection Guide & Purchasing Advice
Before ordering, confirm the total length option (0.5 meter), connector type (miniature ClickLoc), and agency approval (not required). The 146055-05-02-00 is available new and in original factory packing from SpareTechPLC, with a 12-month factory warranty. Verify that your system requires the 3/8-24 UNF thread option. For applications needing different cable lengths or connectors, refer to the 146055-AA-BB-CC ordering code.
Troubleshooting & Common Issues
If the output voltage is outside the –4 to –16 Vdc range, check the probe gap and target material. Ensure the target is AISI 4140 steel for specified accuracy. If readings are noisy, inspect the coaxial cable and connector for damage. The miniature ClickLoc connector must be fully seated. If the probe fails to seal, verify the pressure rating and thread engagement. For persistent issues, contact SpareTechPLC for support.
Frequently Asked Questions
Q1: What is the linear range of the 146055-05-02-00 probe?
A1: The linear range is 1.52 mm (60 mils), starting at approximately 0.25 mm (10 mils) from the target and extending to 1.78 mm (70 mils).
Q2: What is the incremental scale factor for this probe?
A2: For a standard 5-meter or 9-meter system, the ISF is 7.87 V/mm (200 mV/mil) ±6.5% including interchangeability error.
Q3: What is the maximum operating temperature for the probe?
A3: The operating and storage temperature range is -51°C to +177°C (-60°F to +351°F).
Q4: What type of connector does the 146055-05-02-00 use?
A4: It uses a miniature ClickLoc coaxial connector with standard cable.
Q5: What is the nominal DC resistance of the probe?
A5: For the 0.5 meter probe length, the resistance from center conductor to outer conductor is 7.45 ± 0.50 ohms.
