330105-02-12-20-12-00 Bently Nevada XL 8mm Probe

Bently Nevada 330105-02-12-20-12-00 3300 XL 8mm Reverse Mount Probe

Product Introduction

The Bently Nevada 330105-02-12-20-12-00 is a high-performance 3300 XL 8 mm reverse mount proximity probe engineered for precision measurement in rotating machinery. This configuration includes 3/8-24 UNF probe threads, a 2.0 meter (6.6 feet) total length, and a Miniature ClickLoc coaxial connector with FluidLoc cable for enhanced fluid resistance. Additionally, this probe features a Polyphenylene sulfide (PPS) tip and an AISI 303 or 304 stainless steel case, providing excellent durability in demanding industrial environments. For instance, the 3300 XL 8 mm series is widely used in turbomachinery monitoring applications, including steam turbines, compressors, and pumps.

This reverse mount probe incorporates the patented TipLoc molding method, which creates a robust bond between the probe tip and body for long-term reliability. Furthermore, all connector components use gold-plated brass or gold-plated beryllium copper, ensuring excellent electrical conductivity and corrosion resistance. Consequently, the 330105-02-12-20-12-00 delivers stable, accurate measurements even in challenging operating conditions. Moreover, its design includes a probe sleeve that provides additional protection, making the FluidLoc cable option unnecessary for most standard installations. Therefore, you should carefully evaluate your specific application requirements before selecting the FluidLoc option for these probes.

Technical Specifications

Electrical Characteristics

The probe's electrical parameters are fundamental for achieving accurate proximity measurement performance. First, the nominal probe DC resistance from the center conductor to the outer conductor (RPROBE) measures 7.88 ± 0.50 ohms for this 2.0-meter configuration. Second, the probe cable uses 75Ω triaxial construction with fluoroethylene propylene (FEP) insulation as standard, providing excellent signal transmission characteristics. Meanwhile, for extended temperature applications, you can order a perfluoroalkoxy (PFA) insulated cable option that handles higher thermal demands. Furthermore, the maximum rated tensile strength reaches 330 N (75 lbf) at the probe case-to-lead connection and 270 N (60 lbf) at the probe lead-to-extension cable connectors, ensuring mechanical robustness during installation and operation.

Mechanical Construction

Built with a Polyphenylene sulfide (PPS) probe tip and an AISI 303 or 304 stainless steel (SST) probe case, this sensor offers excellent mechanical strength and corrosion resistance. Additionally, the reverse mount design accommodates a maximum thread engagement length of 0.563 inches for the 3/8-24 UNF thread specification. Specifically, the probe weight is approximately 323 g/m (11.4 oz) , giving a total weight of roughly 0.65 kg for this 2.0-meter configuration. Besides, the maximum rated torque for installation is 22.6 N•m (200 in•lb) , while the recommended torque is 7.5 N•m (66 in•lb) to ensure proper fixation without causing mechanical damage.

Environmental Ratings

The 330105-02-12-20-12-00 operates reliably across a wide temperature spectrum. First, its operating and storage temperature range spans -52°C to +177°C (-62°F to +350°F) for the standard configuration. Second, for extended temperature range probes, the tip handles -52°C to +218°C (-62°F to +425°F) , while the cable and connector manage -51°C to +260°C (-60°F to +500°F) . However, you must note that exposing the probe to temperatures below -34°C (-30°F) for a sustained period may cause premature failure of the pressure seal. Furthermore, this probe is specifically designed to seal differential pressure between the probe tip and case, utilizing a Viton® O-ring as the primary sealing material. Additionally, the probe demonstrates less than a 3% change in Average Scale Factor (ASF) when tested in 93% humidity per IEC standard 68-2-3 for up to 56 days, confirming excellent moisture resistance.

Installation Guidelines

Proper installation of the 330105-02-12-20-12-00 is essential for achieving accurate, repeatable measurements and maximizing service life. First, ensure the mounting surface is clean and the threads are completely free from debris or damage. Next, apply the recommended torque of 7.5 N•m (66 in•lb) when installing the reverse mount probe, and never exceed the 22.6 N•m (200 in•lb) maximum rating to avoid thread stripping or case deformation. Remember, the recommended gap setting for 3300 XL 8 mm probes is typically 1.0 mm (40 mils) , which positions the probe optimally within its linear range. For field wiring, use appropriate shielded cable and observe proper termination practices to maintain signal integrity. Finally, always verify that the ClickLoc connector is fully engaged and locked, as its positive locking mechanism prevents loosening from continuous machinery vibration.

Packaging List

• 1 x Bently Nevada 330105-02-12-20-12-00 3300 XL 8mm Reverse Mount Probe (3/8-24 UNF threads, 2.0m FluidLoc cable)

• Installation instructions (reference drawing)

Note: Cables, mounting hardware, and Proximitor sensors are sold separately. Shipping is handled via FedEx, UPS, or DHL.

Frequently Asked Questions

1. What applications is the 330105-02-12-20-12-00 best suited for?
This probe is specifically designed for turbomachinery monitoring applications, including steam turbines, compressors, and pumps. Additionally, its reverse mount configuration suits installations with limited space.

2. Is the FluidLoc cable necessary for this 3300 XL 8mm probe?
For most standard installations, the FluidLoc cable option is not necessary due to the presence of the probe sleeve. Therefore, you should carefully consider your application before ordering this option.

3. What is the temperature range for this Bently Nevada probe?
The standard probe operates from -52°C to +177°C (-62°F to +350°F) . Furthermore, extended temperature range versions handle higher temperatures up to +218°C for the tip.

4. What torque should I apply when installing this reverse mount probe?
The recommended installation torque is 7.5 N•m (66 in•lb) . However, never exceed the maximum rated torque of 22.6 N•m (200 in•lb) to avoid damaging the probe.

5. Does this probe include pressure testing before shipment?
Probes are not pressure tested prior to shipment. However, you can contact the custom design department if you require a pressure seal test for your specific application.