Product Introduction
The Bently Nevada 330191-40-75-50-05 is a 3300 XL 8 mm ETR proximity probe designed for reliable vibration and position monitoring in industrial automation. This industrial automation module features a patented TipLoc molding method that creates a robust bond between probe tip and body, while the CableLoc design delivers 330 N (75 lbf) pull strength to prevent cable separation. Options like FluidLoc cable prevent oil leakage through the cable interior, addressing common failure modes in harsh environments.
Technical Specifications Breakdown
The 330191-40-75-50-05 operates on a power supply of -17.5 Vdc to -26 Vdc (nonincendive circuit) with a maximum consumption of 12 mA. Output resistance is 50 Ω, and supply sensitivity is less than 2 mV change per volt input change. Nominal probe DC resistance for the 5.0 m length is 8.73 ± 0.50 Ω. The probe tip material is polyphenylene sulfide (PPS), and the case is AISI 303 or 304 stainless steel. Standard cable is 75Ω triaxial FEP insulated; extended temperature range uses PFA insulation. The connector is gold-plated brass or beryllium copper with a maximum torque of 0.565 N·m (5 in·lbf). The probe case thread is 3/8-24 UNF with maximum engagement length 0.563 in. Weight is 323 g/m (11.4 oz).
Application Use Cases
The 330191-40-75-50-05 is ideal for monitoring rotating machinery such as turbines, compressors, and pumps in oil & gas, power generation, and petrochemical plants. Its temperature schedule covers ambient ranges from -55°C to +232°C (T1 classification for EPL Ga/Gc) and -55°C to +100°C for Dc applications. The probe seals differential pressure between tip and case using a Viton® O-ring, making it suitable for environments where process leaks are a concern.
Installation & Setup Guidance
Mount the 330191-40-75-50-05 using the 3/8-24 UNF thread, ensuring maximum thread engagement of 0.563 in. Apply a maximum connector torque of 0.565 N·m (5 in·lbf). The 5-meter probe is designed for use only with the 5-meter Proximitor sensor. For one-meter systems, do not use an extension cable. When installing with nonincendive circuits, refer to installation drawing 140979. Avoid operating at voltages more positive than -23.5 Vdc to maintain full linear range.
Maintenance & Reliability
Probe entity parameters are met when used with Bently Nevada extension cables and Proximitor. The 8 mm probe design provides thicker PPS encapsulation, offering enhanced robustness against physical abuse. The stainless steel case resists corrosion. No pressure testing is performed prior to shipment; however, the Viton O-ring provides effective sealing. For long-term reliability, inspect the cable and connectors periodically, especially in high-temperature environments. The extended temperature range cable (PFA insulated) is recommended for ambient above standard limits.
Selection Guide & Purchasing Advice
When ordering, verify the total length option (50 = 5.0 meters, 16.4 feet) and agency approvals (05 = CSA, ATEX, IECEx). The 330191-40-75-50-05 includes an unthreaded length of 4.0 in and overall case length of 7.5 in. For additional protection in oil-wetted environments, specify the FluidLoc cable option. PLC Source PRO stocks new and original factory-packed units with a 12-month warranty, ensuring authentic Bently Nevada quality for critical machinery monitoring.