Product Overview: Bently Nevada 330191-00-33-90-00 Proximity Probe
When machine vibration monitoring demands reliability under harsh conditions, the Bently Nevada 330191-00-33-90-00 delivers exceptional performance. Part of the 3300 XL series, this 8 mm ETR (Extended Temperature Range) proximity probe is engineered to withstand physical abuse, cable pull stress, and fluid leakage—common failure points in rotating machinery. The patented TipLoc molding method secures the probe tip to the body, while CableLoc technology provides 330 N (75 lbf) pull strength, preventing cable separation. An optional FluidLoc cable option stops oil from leaking through the cable interior, making this probe ideal for turbines, compressors, and pumps.
Technical Specifications
The 330191-00-33-90-00 is configured with a 9.0-meter total length, 3.3-inch overall case length, and 0.0-inch unthreaded length. Key electrical and mechanical parameters include:
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Power Supply: Requires -17.5 Vdc to -26 Vdc (nonincendive circuit per drawing 140979) at 12 mA max consumption; with barriers: -23 Vdc to -26 Vdc.
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Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.
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Output Resistance: 50 Ω.
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Probe DC Resistance (9.0 m): 9.87 ± 0.90 Ω.
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Probe Tip Material: Polyphenylene sulfide (PPS).
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Probe Case Material: AISI 303 or 304 stainless steel.
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Standard Cable: 75 Ω triaxial, FEP insulated, available in lengths: 0.5, 1, 1.5, 2, 3, 5, or 9 meters.
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Armor (Optional): Flexible AISI 302/304 SST with FEP outer jacket.
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Connector Material: Gold-plated brass or beryllium copper; maximum torque 0.565 N·m (5 in·lbf).
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Thread: 3/8-24 UNF, maximum engagement length 0.563 in.
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Weight: 323 g/m (11.4 oz/m).
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Temperature Schedule: 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: multiple classes up to +232°C.
Industry Applications
The Bently Nevada 330191-00-33-90-00 is built for continuous vibration monitoring in critical rotating equipment. In steam turbines, the 8 mm probe’s thicker encapsulation and robust stainless steel case resist high temperatures and physical vibration. For centrifugal compressors, the sealed Viton O-ring differential pressure seal prevents contamination. In large pumps, the FluidLoc option eliminates oil wicking through the cable, ensuring reliable readings. The 9.0-meter cable length supports remote mounting, while the 3/8-24 UNF thread simplifies installation into standard probe ports.
Installation and Setup Guidance
Mount the 330191-00-33-90-00 with the case thread engaged up to 0.563 inches maximum. Use the 75 Ω triaxial extension cable (not included with one-meter systems) and connect to a Bently Nevada Proximitor. For nonincendive installations, follow drawing 140979 and supply -17.5 to -26 Vdc. Operation above -23.5 Vdc may reduce linear range. Tighten connectors to 0.565 N·m (5 in·lbf) to avoid damage. The probe is not pressure tested before shipment; verify O-ring integrity after installation.
Maintenance and Reliability
Inspect the 330191-00-33-90-00 probe cable and connectors periodically for wear. The patented CableLoc design (330 N pull strength) and TipLoc molding reduce common failure modes, extending service life. Avoid exceeding temperature limits: for EPL Ga/Gc, T5 (40°C) max; for Dc, T90 (40°C) max. The PPS tip resists chemical attack, and the FEP or PFA cable insulation handles high temperatures. As part of a proactive maintenance program, this probe reduces unplanned downtime and vibration monitoring errors.
Selection Guide and Purchasing Advice
Before ordering the Bently Nevada 330191-00-33-90-00, verify your machine’s thread size (3/8-24 UNF), cable length requirement (9.0 m here), and whether armor is needed. This unit comes without armor, but optional flexible SST armor is available. Ensure compatibility with your existing Bently Nevada extension cables and Proximitor. PLC Source PRO stocks this new, factory-sealed module with a 12-month warranty. Order with confidence for critical spares or system upgrades.