Product Overview
When mechanical shock, fluid ingress, or cable strain threaten the reliability of vibration monitoring, the Bently Nevada 330191-40-75-20-00 3300 XL 8 mm ETR Proximity Probe provides a rugged solution. Designed for demanding industrial environments, this probe incorporates patented TipLoc molding for a robust bond between probe tip and body, and CableLoc technology for 330 N (75 lbf) pull strength to secure the cable. The optional FluidLoc cable prevents oil leakage through the cable interior. This model is the 3300 XL 8 mm ETR with 3/8-24 UNF thread, without armor, with unthreaded length option 40 (4.0 in), overall case length option 75 (7.5 in), and total length option 20 (2.0 meters / 6.6 feet).
Technical Specifications Breakdown
The Bently Nevada 330191-40-75-20-00 operates on a power supply requirement of -17.5 Vdc to -26 Vdc (nonincendive) and -23 Vdc to -26 Vdc with barriers, with a maximum consumption of 12 mA. Supply sensitivity is less than 2 mV change per volt change, and output resistance is 50 Ω. The probe tip is made of polyphenylene sulfide (PPS), and the case is AISI 303 or 304 stainless steel. The standard cable is 75Ω triaxial FEP insulated, and extended temperature range cable uses PFA insulation. Tensile strength is 330 N (75 lbf) from case to lead and 270 N (60 lbf) at the extension cable connector. Connector material is gold-plated brass or beryllium copper, with maximum torque of 0.565 N•m (5 in•lbf). Probe case thread is 3/8-24 with maximum thread engagement of 0.563 in. Weight is 323 g/m (11.4 oz).
Nominal probe DC resistance at 2.0 m length is 7.88 ± 0.50 Ω.
Temperature schedule (probe only):
| Temperature Classification |
EPL Ga and Gc |
EPL Dc |
| T1 |
-55°C to +232°C |
280°C @ Ta -55°C to +232°C |
| T2 |
-55°C to +177°C |
225°C @ Ta -55°C to +177°C |
| T3 |
-55°C to +120°C |
170°C @ Ta -55°C to +120°C |
| T4 |
-55°C to +80°C |
130°C @ Ta -55°C to +80°C |
| T5 |
-55°C to +40°C |
105°C @ Ta -55°C to +100°C |
|
|
90°C @ Ta -55°C to +40°C |
Installation and Setup Guidance
The 330191-40-75-20-00 mounts with a 3/8-24 UNF thread. Ensure maximum thread engagement of 0.563 in to avoid damage. When connecting extension cables, use only BN extension cables and BN Prox to maintain entity parameters. For nonincendive circuits, follow installation drawing 140979. One-meter systems do not use an extension cable. The probe sealing material is a Viton O-ring; probes are not pressure tested prior to shipment, so verify differential pressure sealing requirements. Apply connector torque up to 0.565 N•m (5 in•lbf).
Maintenance and Reliability
Inspect the probe cable and connectors periodically for wear. The patented CableLoc design resists pull forces up to 330 N, but check for any signs of cable strain. The Viton O-ring should be replaced if leakage is suspected. Operate within the temperature schedule to maintain reliability for EPL Ga, Gc, or Dc zones. The PPS probe tip provides robust encapsulation to withstand physical abuse; however, avoid direct impact that could exceed material limits.
Selection Guide and Purchasing Advice
When ordering, verify the unthreaded length (40 = 4.0 in), overall case length (75 = 7.5 in), and total length (20 = 2.0 meters). The agency approval option 00 indicates not required. PLC Source PRO offers this Bently Nevada 330191-40-75-20-00 as a new, factory-packaged unit with a 12-month warranty. Ensure compatibility with your vibration monitoring system and required cable length.