Product Introduction
When upgrading aging proximity probes or installing new vibration monitoring systems, the Bently Nevada 330191-00-40-50-05 delivers proven reliability and enhanced performance. This 3300 XL 8 mm ETR Probe is designed to replace older probe designs, offering a 5-meter total length (16.4 feet) with 0.0 inch unthreaded and 4.0 inch overall case length. The 330191-00-40-50-05 features a 3/8-24 UNF thread without armor and carries CSA, ATEX, and IECEx agency approvals, making it suitable for hazardous area installations. As part of the 3300 XL series, this probe incorporates patented TipLoc and CableLoc technologies for a more robust connection between tip and body, as well as increased pull strength up to 330 N. The larger 8 mm probe diameter provides a thicker PPS encapsulation for superior resistance to physical abuse, extending service life and reducing maintenance intervals.
Technical Specifications Breakdown
The Bently Nevada 330191-00-40-50-05 proximity probe is engineered for precise, reliable measurements in demanding environments. Key specifications from the datasheet include:
| Parameter |
Value |
| Power Supply |
-17.5 Vdc to -26 Vdc (nonincendive), -23 Vdc to -26 Vdc with barriers |
| Sensitivity |
Less than 2 mV change in output voltage per volt change in input voltage |
| Output Resistance |
50 Ω |
| Probe DC Resistance (5.0 m) |
8.73 ± 0.50 Ω |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 303 or 304 stainless steel |
| Standard Cable |
75 Ω triaxial, FEP insulated |
| Tensile Strength (Probe Case to Lead) |
330 N (75 lbf) |
| Connector Material |
Gold-plated brass or beryllium copper |
| Maximum Connector Torque |
0.565 N·m (5 in·lbf) |
| Probe Case Thread |
3/8-24, maximum engagement 0.563 in |
| Weight per Meter |
323 g/m (11.4 oz) |
The probe operates with a -17.5 Vdc to -26 Vdc supply when connected per drawing 140979, consuming a maximum of 12 mA. Operation below -23.5 Vdc may reduce linear range. The sensitivity ensures minimal drift, and the 50 Ω output impedance allows easy integration with Bently Nevada proximitors. The probe's temperature classification covers T1 through T5 for EPL Ga and Gc, and several categories for EPL Dc, enabling use across a wide ambient temperature range.
Real-World Applications
This probe is ideal for upgrading legacy vibration monitoring systems in turbines, compressors, pumps, and motors. The patented CableLoc design provides 330 N pull strength, preventing cable detachment in high-vibration environments. For example, in a petrochemical plant where oil leakage through probe cables was a recurring issue, the optional FluidLoc feature (available with this 330191-00-40-50-05) prevents liquid ingress by sealing the cable interior. Similarly, in gas turbine applications, the 8 mm probe's thicker PPS tip offers greater resistance to high-frequency vibration, reducing false trip events. The 5-meter length makes it directly compatible with 5-meter proximitors, simplifying replacement of older probes without rewiring.
Maintenance and Reliability
The 330191-00-40-50-05 is built for minimal maintenance. The Viton® O-ring seals the differential pressure between tip and case, but probes are not pressure tested before shipment. During routine inspection, check connector torque to 0.565 N·m and verify cable integrity. The gold-plated connectors resist corrosion, and the stainless steel case withstands harsh chemicals. Given the robust TipLoc and CableLoc bonding, typical inspection intervals can be extended compared to older models. If using the FluidLoc option, ensure the cable exterior is free of oil accumulation. The probe entity parameters are met when used with Bently Nevada extension cables and proximitors, so always use approved components for optimal reliability.
Selection Guide
Before purchasing the Bently Nevada 330191-00-40-50-05, verify that your system requires a 5-meter probe with 3/8-24 thread and no armor. This model is for use exclusively with 5-meter proximitors. Confirm agency approval requirements: it carries CSA, ATEX, and IECEx certifications. For installations needing armor or different cable length, consider other ordering options. PLC Source PRO provides this probe in new, factory-packed condition with a 12-month warranty. Ensure your system's power supply meets the -17.5 Vdc to -26 Vdc range. For systems with barriers, note the narrower -23 Vdc to -26 Vdc range. Always consult installation drawing 140979 for nonincendive circuits.