Introduction to the Bently Nevada 330191-00-70-15-CN
The Bently Nevada 330191-00-70-15-CN is a 3300 XL 8 mm ETR proximity probe designed for reliable vibration and position monitoring in rotating machinery. This probe incorporates patented TipLoc and CableLoc technologies to address common failure modes such as probe tip detachment and cable pull-out. The 330191-00-70-15-CN offers a robust construction with a Polyphenylene sulfide (PPS) probe tip and a stainless steel case, ensuring long-term durability in harsh industrial environments. It operates at a supply voltage of -17.5 Vdc to -26 Vdc and delivers a sensitivity of less than 2 mV change per volt change in input voltage.
Technical Specifications
| Parameter |
Value |
| Supply Voltage (nonincendive) |
-17.5 Vdc to -26 Vdc |
| Supply Voltage (with barriers) |
-23 Vdc to -26 Vdc |
| Max Supply Current |
12 mA |
| Supply Sensitivity |
< 2 mV/V change |
| Output Resistance |
50 Ω |
| Probe DC Resistance (1.5 m) |
7.73 ± 0.50 Ω |
| Cable Type (Standard) |
75Ω triaxial, FEP insulated |
| Extended Temp Cable |
75Ω triaxial, PFA insulated |
| Tensile Strength (probe case to lead) |
330 N (75 lbf) |
| Tensile Strength (lead to extension) |
270 N (60 lbf) |
| Connector Material |
Gold-plated brass or beryllium copper |
| Max Connector Torque |
0.565 N·m (5 in·lbf) |
| Probe Case Thread |
3/8-24 UNF, max engagement 0.563 in |
| Weight |
323 g/m (11.4 oz) |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 303 or 304 stainless steel |
Installation and Mounting Guidance
When installing the Bently Nevada 330191-00-70-15-CN, ensure the mounting hole threads match the 3/8-24 UNF probe case thread. The unthreaded length is 0.0 in, and the overall case length is 7 in (option 70). The total cable length is 1.5 m (4.9 feet) with option 15. Use the included Viton O-ring to seal differential pressure between the probe tip and case. Note that the probe is not pressure tested prior to shipment. For best linear range, maintain the supply voltage at -23.5 Vdc or more negative when using barriers.
Maintenance and Long-Term Reliability
The 330191-00-70-15-CN is built for minimal maintenance. The patented TipLoc molding method provides a robust bond between the probe tip and body, reducing risk of tip detachment. The CableLoc design ensures a pull strength of 330 N (75 lbf) at the probe case to lead joint. The probe operates reliably across a wide temperature range: for EPL Ga and Gc, the ambient temperature can go from -55°C up to +232°C (T1 classification). The FluidLoc cable option (available separately) prevents oil and other liquids from leaking through the cable interior. For maximum lifespan, avoid operating at supply voltages more positive than -23.5 Vdc as this can reduce linear range.
Troubleshooting Common Probe Issues
Problem: Reduced linear range or no signal. Check the supply voltage. The Bently Nevada 330191-00-70-15-CN requires -17.5 Vdc to -26 Vdc for nonincendive circuits. If using barriers, ensure voltage is between -23 Vdc and -26 Vdc. Operation above -23.5 Vdc may reduce linear range. Problem: Cable pull-out or intermittent signal. The 330191-00-70-15-CN features a CableLoc design that provides 330 N pull strength. Verify the connector torque does not exceed 0.565 N·m. Problem: Oil leakage around cable. Consider upgrading to the FluidLoc cable option. Problem: Probe tip damage. The PPS tip is rugged, but avoid physical abuse. The 8 mm probe body provides a thicker encapsulation for extra robustness.
Selection Guide and Purchasing Advice
When ordering the Bently Nevada 330191-00-70-15-CN, verify the ordering number options: unthreaded length (0.0 in), overall case length (70 = 7 in), total length (15 = 1.5 m), and agency approval (CN = Country Specific Approval). This unit is supplied new and in original factory packing with a 12-month factory warranty. For reliable sourcing, choose PLC Source PRO for genuine Bently Nevada spares and support.