Product Introduction
The Bently Nevada 330191-40-75-90-05 is a precision 3300 XL 8 mm ETR proximity probe designed for reliable vibration and position monitoring in critical rotating machinery. This model addresses common failure modes such as probe tip detachment and cable pull-out through patented TipLoc and CableLoc technologies. With a robust 330 N (75 lbf) pull strength at the probe case to lead and a FluidLoc cable option to prevent oil leakage, the 330191-40-75-90-05 ensures minimal downtime and extended service life. It is suitable for harsh environments with CSA, ATEX, and IECEx approvals.
Technical Specifications
| Parameter |
Value |
| Power Supply |
-17.5 Vdc to -26 Vdc (12 mA max) |
| Output Resistance |
50 Ω |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 303 or 304 stainless steel |
| Cable Type |
75Ω triaxial FEP or PFA insulated |
| Tensile Strength (Case to Lead) |
330 N (75 lbf) |
| Connector Material |
Gold-plated brass or beryllium copper |
| Thread Size |
3/8-24 UNF |
| Total Length |
9.0 meters (29.5 feet) |
| Weight |
323 g/m (11.4 oz/m) |
Industry Applications
The 330191-40-75-90-05 excels in turbomachinery, compressors, pumps, and fans where precise shaft displacement and vibration measurement is critical. Its extended temperature range (-55°C to +232°C) allows operation in extreme conditions. The 8 mm probe diameter provides enhanced robustness against physical abuse, making it ideal for high-vibration environments such as steam turbines and gearboxes.
Installation and Setup Guidance
Install the 330191-40-75-90-05 with the specified 3/8-24 UNF thread, ensuring maximum thread engagement of 0.563 inches. Use a torque of 0.565 N•m (5 in•lbf) on connectors to avoid damage. The Viton® O-ring seals differential pressure between tip and case; probes are not pressure tested before shipment. For one-meter systems, no extension cable is required. Always verify probe entity parameters when connecting to BN extension cables and BN Proximitors.
Maintenance and Reliability
Regularly inspect the probe tip and cable assembly for signs of wear or contamination. The robust TipLoc and CableLoc designs minimize maintenance needs. Follow the temperature classification schedule for ambient conditions to ensure linear operation. Operation at voltages more positive than -23.5 Vdc may reduce linear range—monitor supply voltage. Replace the probe if the DC resistance (9.87 ± 0.50 Ω for 9.0 m) deviates significantly.
Selection Guide and Purchasing Advice
When ordering the 330191-40-75-90-05, verify unthreaded length (4.0 in), overall case length (7.5 in), and total length (9.0 m). The agency approval option 05 includes CSA, ATEX, and IECEx. For fluid-leak prevention, choose the FluidLoc cable option. PLC Source PRO supplies this unit new in factory packing with a 12-month warranty. Ensure compatibility with your existing Bently Nevada monitoring system before purchase.