Product Overview
The Bently Nevada 330191-00-40-20-00 is a 3300 XL 8 mm ETR proximity probe designed for reliable vibration monitoring in industrial rotating machinery. This industrial automation module incorporates patented TipLoc and CableLoc technologies to provide superior robustness against physical abuse and cable pull-out. The 330191-00-40-20-00 features a 3/8-24 UNF thread, 2.0-meter total length, and no armor, making it suitable for a wide range of applications.
Failure Mode Analysis – Enhanced Durability
Common failure modes in proximity probes include cable breakage at the connector, probe tip separation, and liquid ingress through the cable interior. The Bently Nevada 330191-00-40-20-00 addresses these issues directly. The patented TipLoc molding method creates a stronger bond between the probe tip and body, reducing the risk of tip detachment. The CableLoc design provides 330 N (75 lbf) pull strength between the probe case and lead, and 270 N (60 lbf) at the lead-to-extension cable connector, minimizing cable failures. Additionally, the optional FluidLoc cable option prevents oil and other liquids from leaking through the cable interior, making the 330191-00-40-20-00 ideal for environments with potential fluid exposure.
Technical Specifications
| Parameter |
Value |
| Power Supply (nonincendive circuit) |
-17.5 Vdc to -26 Vdc at 12 mA max |
| Power Supply (with barriers) |
-23 Vdc to -26 Vdc |
| Sensitivity |
<2 mV change per volt input change |
| Output Resistance |
50 Ω |
| Probe DC Resistance (2.0 m length) |
7.88 ± 0.50 Ω |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 303 or 304 stainless steel |
| Standard Cable |
75 Ω triaxial FEP insulated |
| Extended Temp Cable |
75 Ω triaxial PFA insulated |
| Maximum Tensile Strength (case to lead) |
330 N (75 lbf) |
| Maximum Connector Torque |
0.565 N•m (5 in•lbf) |
| Thread Size |
3/8-24 UNF (max thread engagement 0.563 in) |
| Probe Weight |
323 g/m (11.4 oz/ft) |
| Temperature Range (EPL Ga/Gc, T1–T5) |
-55°C to +232°C (T1) down to -55°C to +40°C (T5) |
| Temperature Range (EPL Dc, T280°C–T90°C) |
-55°C to +232°C (T280°C) down to -55°C to +40°C (T90°C) |
Installation Guidance
When installing the Bently Nevada 330191-00-40-20-00, ensure the probe tip is properly seated in the mounting hole with 3/8-24 UNF threads. The maximum thread engagement is 0.563 inches to avoid bottoming out. The Viton O-ring at the probe tip provides a seal against differential pressure. For systems longer than 1 meter, use a compatible extension cable. The probe requires a supply voltage of -17.5 Vdc to -26 Vdc when connected to a nonincendive circuit per drawing 140979, or -23 Vdc to -26 Vdc with barriers. Operation above -23.5 Vdc may reduce linear range.
Maintenance & Reliability
The robust construction of the Bently Nevada 330191-00-40-20-00 minimizes routine maintenance. The PPS tip and stainless steel case resist corrosion and physical wear. The 330 N pull strength ensures cable integrity under stress. The temperature classification allows operation from -55°C to +232°C, depending on the T-rating. For extended cable life, consider the optional PFA-insulated cable for high-temperature environments. Regular inspection of the O-ring and connector torque (0.565 N•m) can prevent leakage and signal degradation.
Selection Guide
When ordering the Bently Nevada 330191-00-40-20-00, verify the unthreaded length (00 = 0.0 in), overall case length (40 = 4.0 in), total length (20 = 2.0 meters), and agency approval (00 = not required). For armored or fluid-resistant options, contact your supplier. PLC Source PRO offers this industrial automation module in new, original factory packing with a 12-month warranty. Ensure compatibility with your existing Bently Nevada proximity system, including extension cables and proximitors.