Product Overview
When protecting critical rotating machinery, the Bently Nevada 330191-40-75-90-CN 3300 XL 8 mm ETR Probe delivers reliable vibration monitoring. This proximity probe features a patented TipLoc molding method for robust tip-to-body bonding and a CableLoc design providing 330 N (75 lbf) pull strength. The 330191-40-75-90-CN replaces older 8 mm probes with enhanced durability and a thicker PPS probe tip encapsulation.
Technical Specifications
Key parameters for the Bently Nevada 330191-40-75-90-CN include:
- Power: Requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption (with barriers: -23 Vdc to -26 Vdc)
- Supply Sensitivity: Less than 2 mV change in output voltage per volt change in input
- Output Resistance: 50 Ω
- Probe DC Resistance (9.0 m length): 9.87 Ω ± 0.50
- Probe Tip Material: Polyphenylene sulfide (PPS)
- Probe Case Material: AISI 303 or 304 stainless steel
- Standard Cable: 75Ω triaxial, FEP insulated, available lengths 0.5 to 9 m
- Extended Temperature Cable: 75Ω triaxial, PFA insulated
- Tensile Strength: 330 N (75 lbf) probe case to lead; 270 N (60 lbf) at connectors
- Connector Material: Gold-plated brass or beryllium copper
- Maximum Connector Torque: 0.565 N·m (5 in·lbf)
- Probe Weight: 323 g/m (11.4 oz)
- Temperature Classification: T1-T5 for EPL Ga/Gc; T280°C to T90°C for EPL Dc
Industry Applications
The 330191-40-75-90-CN is designed for vibration monitoring in turbomachinery, compressors, pumps, and fans. Its robust 8 mm probe diameter and stainless steel case withstand harsh industrial environments. The optional FluidLoc cable prevents oil leakage, making it ideal for applications where fluid ingress is a concern. Whether upgrading existing Bently Nevada systems or replacing older probes, this unit ensures consistent performance.
Installation & Setup
Mount the probe using the 3/8-24 UNF thread with a maximum engagement length of 0.563 in. Ensure the probe tip is clean and the Viton® O-ring seals the differential pressure. Use only Bently Nevada extension cables to maintain entity parameters. For one-meter systems, no extension cable is needed. Observe correct power supply range (-17.5 to -26 Vdc nonincendive) to avoid reduced linear range.
Maintenance & Reliability
With a 12-month factory warranty, this probe requires minimal maintenance. Regularly inspect the cable for damage, especially at connectors. The gold-plated connectors resist corrosion. The PPS tip provides chemical resistance. Operation within the specified temperature range (-55°C to +232°C for T1) ensures long life. Upgrading to this model reduces downtime due to its stronger mechanical design.
Selection Guide
When ordering, verify the total length option: this 330191-40-75-90-CN comes with 9.0 meters (29.5 feet) total probe length. Ensure compatibility with your Bently Nevada monitor system. PLC Source PRO supplies new, factory-packed units with full warranty. For custom lengths or armor options, contact our team.