Product Overview
When upgrading your vibration monitoring system, the Bently Nevada 330191-00-70-05-CN 3300 XL 8 mm ETR Probe offers a significant improvement over older designs. This 0.5 meter (1.6 feet) proximity probe is engineered with patented TipLoc and CableLoc technologies to provide a more robust bond and higher tensile strength—330 N (75 lbf) for the probe case to lead. Whether replacing a legacy 3300 series probe or retrofitting a new installation, this model from the 3300 XL family ensures reliable, accurate measurements.
Technical Specifications
The Bently Nevada 330191-00-70-05-CN operates with a supply requiring -17.5 to -26 Vdc (nonincendive) or -23 to -26 Vdc with barriers, at 12 mA maximum consumption. Output resistance is 50 Ω. The probe tip material is Polyphenylene sulfide (PPS), and the case is AISI 303 or 304 stainless steel. Nominal DC resistance (RPROBE) at 0.5 m is 7.45 ± 0.50 Ω. The cable is 75 Ω triaxial, FEP insulated, with a total length of 0.5 m. Maximum rated tensile strength is 330 N (75 lbf) for the probe case to lead, and 270 N (60 lbf) at the lead-to-extension cable connectors. Connector material is gold-plated brass or beryllium copper, with maximum torque of 0.565 N·m (5 in·lbf). Thread is 3/8-24 UNF, with maximum thread engagement length of 0.563 in. The probe weighs 323 g/m (11.4 oz).
Real-World Applications
This probe is ideal for monitoring rotating machinery such as turbines, compressors, and pumps. In a gas turbine upgrade project, the Bently Nevada 330191-00-70-05-CN provides accurate shaft vibration readings even in high-temperature environments (up to 232°C for T1 classification). The FluidLoc cable option, available on this series, prevents oil leaks in sealed bearing housings, reducing maintenance and downtime. Its 8 mm thick encapsulation in PPS plastic adds physical robustness against shock and contamination.
Installation and Setup Guidance
When mounting the Bently Nevada 330191-00-70-05-CN, ensure the threaded hole is clean and free of debris. The 3/8-24 UNF thread requires a maximum engagement of 0.563 in. Apply Viton® O-ring for pressure sealing (probe not pressure tested prior to shipment). For optimal linear range, maintain supply voltage more negative than -23.5 Vdc. Use only BN extension cables and connect to a BN Proximitor for proper entity parameters. Tighten connectors to 0.565 N·m (5 in·lbf) maximum.
Maintenance and Reliability
The Bently Nevada 330191-00-70-05-CN is designed for long service life. The patented CableLoc provides 330 N pull strength, reducing the risk of cable pullout. Routine inspection should check for cable damage, connector corrosion, and O-ring integrity. The temperature schedule allows operation from -55°C to +232°C (T1) without barriers. For extended temperature range cables, PFA insulation is available. No special calibration is required; the probe meets sensitivity specs of less than 2 mV change per volt change in input voltage.
Selection Guide and Purchasing Advice
Before ordering, verify the total probe length (0.5 m), case length (7 in), and agency approval (CN). The Bently Nevada 330191-00-70-05-CN is a new, original factory-packed unit with a 12-month warranty. For additional accessories like extension cables or FluidLoc option, contact PLC Source PRO. We ensure fast shipping and genuine parts.