Product Introduction
When industrial machinery experiences vibration-related failures, precise monitoring is critical. The Bently Nevada 330191-00-70-50-CN Industrial Automation Module – a 3300 XL 8 mm ETR proximity probe – delivers reliable shaft vibration and position measurements in harsh environments. Engineered with patented TipLoc and CableLoc technologies, this probe ensures robust tip bonding and exceptional cable pull strength (330 N / 75 lbf), minimizing common failure points. Designed for use with a 5-meter Proximitor sensor, it provides accurate data for protecting rotating assets such as turbines, compressors, and pumps.
Technical Specifications
Key parameters of the Bently Nevada 330191-00-70-50-CN include:
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Power Supply: Requires -17.5 Vdc to -26 Vdc (nonincendive circuit) at 12 mA max; -23 Vdc to -26 Vdc with barriers.
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Sensitivity: Less than 2 mV output voltage change per volt input change.
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Output Resistance: 50 Ω.
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Probe DC Resistance (RPROBE): 8.73 ± 0.50 Ω for 5.0 m length.
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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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Cable: 75 Ω triaxial, FEP or PFA insulated, available in multiple lengths. Standard cable lengths include 0.5, 1, 1.5, 2, 3, 5, or 9 meters.
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Armor (optional): Flexible AISI 302 or 304 SST with FEP outer jacket.
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Tensile Strength: 330 N (75 lbf) probe case to probe lead; 270 N (60 lbf) at connectors.
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Connector Material: Gold-plated brass or gold-plated beryllium copper. Maximum torque: 0.565 N·m (5 in·lbf).
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Thread: 3/8-24 UNF, maximum thread engagement 0.563 in.
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Weight: 323 g/m (11.4 oz).
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Temperature schedule: For EPL Ga and Gc: T1 (-55°C to +232°C) to T5 (-55°C to +40°C); for EPL Dc: various ranges up to +232°C.
These specifications ensure reliable operation across extreme temperatures and demanding conditions.
Industry Applications
The Bently Nevada 330191-00-70-50-CN proximity probe is ideal for vibration monitoring on critical rotating equipment. Typical applications include:
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Steam Turbines: Shaft radial vibration and thrust position monitoring to prevent catastrophic failures.
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Centrifugal Compressors: Continuous measurement of shaft movement in high-speed trains.
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Pumps and Motors: Early detection of imbalance or misalignment to reduce unplanned downtime.
With its extended temperature range (up to +232°C) and robust construction, this probe suits both standard and high-temperature installations.
Installation & Setup Guidance
Proper installation of the 330191-00-70-50-CN ensures optimal performance. Follow these guidelines:
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Mounting: Use a 3/8-24 UNF threaded hole. Maximum thread engagement is 0.563 inches. Ensure the probe tip is properly seated and the Viton® O‑ring provides a differential pressure seal.
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Cable Routing: Avoid sharp bends and secure the cable using the provided armor option to protect against abrasion. The minimum unthreaded length is 0.0 inches; overall case length is 7 inches.
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Torque: Apply a maximum torque of 0.565 N·m (5 in·lbf) to the connector to avoid damage.
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System Compatibility: This 5-meter probe is designed for use with a 5-meter Proximitor sensor only. Do not mix cable lengths.
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FluidLoc Option: If oil leakage through the cable is a concern, order the optional FluidLoc cable to prevent liquid ingress.
Always refer to the installation drawing 140979 for nonincendive circuit connections.
Maintenance & Reliability
The 330191-00-70-50-CN is built for long-term reliability in harsh environments. Key maintenance points include:
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Inspect Cable and Connectors: Periodically check for wear, corrosion, or physical damage. Gold-plated connectors resist corrosion but should be kept clean.
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Environmental Limits: The probe operates from -55°C to +232°C (T1 classification). Choose the correct temperature classification for your zone (Ga, Gc, or Dc).
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Probe Sealing: The Viton O‑ring seals differential pressure; verify integrity after installation.
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Avoid Over-Torque: Excessive torque can damage the connector or thread.
By adhering to these practices, you maximize probe lifespan and measurement accuracy.
Selection Guide & Purchasing Advice
When selecting the Bently Nevada 330191-00-70-50-CN for your application, verify the following:
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Total Length: This variant has a 5.0-meter total cable (16.4 feet). Confirm your proximitor cable length matches.
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Armor Requirement: If the cable will be exposed to mechanical stress, choose the optional flexible armor (AISI 302/304 SST with FEP jacket).
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Agency Approval: The CN suffix indicates country-specific approval. Ensure it meets local regulatory requirements.
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FluidLoc Option: For machines where oil leakage through the cable interior is a concern, this option prevents leaks.
PLC Source PRO is your trusted supplier for genuine Bently Nevada parts. We offer new and original factory-packed units with a 12-month warranty. Contact our team for assistance with configuration and compatibility.