Product Overview: Upgrade Your Vibration Monitoring with the Bently Nevada 330191-00-70-50-05
The Bently Nevada 330191-00-70-50-05 is a 3300 XL 8 mm ETR proximity probe designed to replace older vibration monitoring probes with enhanced reliability. This probe features a patented TipLoc molding method that creates a robust bond between the probe tip and body, along with a CableLoc design providing 330 N (75 lbf) pull strength to secure the cable. For applications exposed to oil or liquids, an optional FluidLoc cable option prevents leaks through the cable interior. The 330191-00-70-50-05 comes with a 5.0 meter total length, 7-inch overall case length, and a minimum unthreaded length of 0.0 inches, making it a direct upgrade for 5-meter Proximitor sensor systems.
Technical Specifications Breakdown
Key specifications of the Bently Nevada 330191-00-70-50-05 ensure precise performance in demanding industrial environments:
| Parameter |
Value |
| Power Supply |
-17.5 Vdc to -26 Vdc (nonincendive circuit), -23 Vdc to -26 Vdc with barriers; 12 mA max consumption |
| Supply Sensitivity |
Less than 2 mV change per volt change in input voltage |
| Output Resistance |
50 Ω |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 303 or 304 stainless steel |
| Cable Type |
75Ω triaxial, FEP (standard) or PFA (extended temperature) insulated |
| Tensile Strength (probe case to lead) |
330 N (75 lbf) |
| Connector Torque (max) |
0.565 N·m (5 in·lbf) |
| Probe Thread |
3/8-24 UNF, max engagement 0.563 in |
| Probe Weight |
323 g/m (11.4 oz/m) |
| Approvals |
CSA, ATEX, IECEx |
Real-World Applications
The Bently Nevada 330191-00-70-50-05 excels in rotating machinery such as turbines, compressors, and pumps where precise shaft vibration monitoring is critical. Its 8 mm probe diameter with thicker PPS encapsulation provides optimal robustness against physical abuse, reducing false trips and maintenance interventions. By upgrading to this probe, facilities can achieve longer service intervals and improved signal fidelity compared to older designs. For example, in a steam turbine retrofit, the 330191-00-70-50-05's improved sealing and pull strength minimize probe failure due to oil ingress or cable stress.
Installation and Setup Guidance
Install the Bently Nevada 330191-00-70-50-05 using the 3/8-24 UNF thread with a maximum engagement length of 0.563 inches. Torque the connector to 0.565 N·m (5 in·lbf) using a calibrated tool to avoid damage. The probe sealing material is a Viton O-ring, ensuring differential pressure sealing between the tip and case; note that probes are not pressure tested before shipment. Use only with a 5-meter Proximitor sensor as the 5.0 meter total length requires matching electronics. For best results, route the 75Ω triaxial cable away from sources of EMI and secure with strain relief.
Maintenance and Reliability
The patented TipLoc and CableLoc designs of the Bently Nevada 330191-00-70-50-05 reduce the need for frequent inspections, but periodic checks of the O-ring condition and cable integrity are recommended. The probe operates within ambient temperature ranges from -55°C to +232°C depending on temperature classification (T1–T5). Regular monitoring of output resistance and sensitivity ensures the system remains within calibration. With proper care, this probe delivers reliable performance over extended periods, aligning with an upgrade strategy that minimizes downtime and total cost of ownership.
Selection Guide and Purchasing Advice
When selecting the Bently Nevada 330191-00-70-50-05, verify compatibility with your existing Proximitor sensor (5-meter systems only) and confirm the required cable type (standard or extended temperature range). Optional armor (flexible AISI 302/304 SST with FEP jacket) is available for harsh environments. For guaranteed quality and factory warranty, source this probe from PLC Source PRO, a trusted supplier of automation spares. Ensure that the total length (5.0 meters) and unthreaded length (0.0 inches) match your installation requirements.