Product Overview
The Bently Nevada 330191-40-75-20-05 is a 3300 XL 8 mm ETR proximity probe designed for reliable vibration and position measurement in industrial rotating machinery. This model features a 3/8-24 UNF thread without armor, a 4.0-inch unthreaded length, a 7.5-inch overall case length, and a 2.0-meter (6.6 feet) total length. The probe includes patented TipLoc and CableLoc technologies for enhanced mechanical robustness and pull strength of 330 N (75 lbf). Agency approvals include CSA, ATEX, and IECEx (option 05), making it suitable for hazardous area installations.
Technical Specifications
Key performance parameters for the Bently Nevada 330191-40-75-20-05 are derived from the manufacturer's design:
-
Supply Voltage: Requires -17.5 Vdc to -26 Vdc (with nonincendive circuit per drawing 140979) at 12 mA maximum consumption; -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 (RPROBE): 7.88 ± 0.50 Ω at 2.0 m length (center to outer conductor).
-
Probe Tip Material: Polyphenylene sulfide (PPS).
-
Case Material: AISI 303 or 304 stainless steel.
-
Standard Cable: 75 Ω triaxial, FEP insulated; available in lengths 0.5, 1, 1.5, 2, 3, 5, or 9 meters.
-
Tensile Strength: 330 N (75 lbf) probe case to lead; 270 N (60 lbf) at connector.
-
Connector Material: Gold-plated brass or beryllium copper; maximum torque 0.565 N·m (5 in·lbf).
-
Thread: 3/8-24 UNF with maximum engagement length of 0.563 in.
-
Weight: 323 g/m (11.4 oz/m).
-
Temperature Schedule (Probe Only): For EPL Ga/Gc: T1 -55°C to +232°C, T2 -55°C to +177°C, T3 -55°C to +120°C, T4 -55°C to +80°C, T5 -55°C to +40°C. For EPL Dc: T280°C @ Ta -55°C to +232°C, T225°C @ Ta -55°C to +177°C, T170°C @ Ta -55°C to +120°C, T130°C @ Ta -55°C to +80°C, T105°C @ Ta -55°C to +100°C, T90°C @ Ta -55°C to +40°C.
Industry Applications
This Bently Nevada 330191-40-75-20-05 probe is ideal for upgrading older 3300 series installations in turbines, compressors, pumps, and fans where precise shaft vibration monitoring is critical. The 8 mm design provides thicker PPS encapsulation for enhanced ruggedness in harsh environments. The optional FluidLoc cable (not included) prevents oil leakage along the cable interior, making it valuable for lubricated machinery. Uses include:
- Steam and gas turbine bearing vibration monitoring.
- Centrifugal compressor shaft position measurement.
- Motor and generator rotor clearance monitoring.
Installation and Setup
The Bently Nevada 330191-40-75-20-05 requires proper mounting to ensure reliable performance. Follow these guidelines:
- Use a 3/8-24 UNF threaded hole; ensure thread engagement does not exceed 0.563 inches to avoid mechanical interference.
- Tighten the probe connector to 0.565 N·m (5 in·lbf) maximum.
- Calibrate the system using an appropriate Bently Nevada proximity driver (e.g., 3300 or 3500 series) to achieve linear output.
- For nonincendive circuits, refer to installation drawing 140979; maintain supply voltage between -17.5 Vdc and -26 Vdc for barrier-less operation, or -23 Vdc to -26 Vdc with barriers. Operation above -23.5 Vdc may reduce linear range.
- One-meter systems do not require an extension cable; for longer runs, use compatible BN extension cables.
Maintenance and Reliability
With TipLoc and CableLoc designs, the Bently Nevada 330191-40-75-20-05 offers robust mechanical bonding and 330 N pull strength, reducing failure risk from vibration and cable pull. The Viton O-ring differential seal prevents leakage between tip and case. Inspect the cable and connector annually for wear; replace if resistance deviates from 7.88 ± 0.50 Ω at 2.0 m. The temperature schedule supports wide ambient ranges (down to -55°C) for cold-environment installations.
Selection Guide and Purchasing Advice
When ordering the Bently Nevada 330191-40-75-20-05, verify your required total length and cable type. This unit includes a 2.0-meter FEP-insulated triaxial cable. For extended temperature ranges or armor, consider alternate options. PLC Source PRO supplies this module new in factory packaging with a 12-month warranty. Ensure your monitoring system is compatible with 8 mm 3300 XL probes before purchase.