Product Introduction
When vibration monitoring probes fail due to oil leakage or physical abuse, the Bently Nevada 330191-00-70-20-05 provides a robust solution. This 3300 XL 8 mm ETR Probe, without armor, incorporates patented TipLoc molding and CableLoc design to prevent common failure modes. The 330191-00-70-20-05 offers a 2.0-meter total length, 7-inch overall case length, and multiple agency approvals.
Technical Specifications Breakdown
The 330191-00-70-20-05 delivers precise performance under demanding conditions. Key specifications include:
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Power Supply: Requires -17.5 Vdc to -26 Vdc (nonincendive circuit) 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 (2.0 m): 7.88 ± 0.50 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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Cable: 75Ω triaxial, FEP insulated standard or PFA for extended temperature.
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Tensile Strength: 330 N (75 lbf) probe case to lead; 270 N (60 lbf) at connector.
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Connector Material: Gold-plated brass or beryllium copper.
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Maximum Connector Torque: 0.565 N·m (5 in·lbf).
Industry Applications
The Bently Nevada 330191-00-70-20-05 is ideal for monitoring rotating machinery such as turbines, compressors, and pumps. Its robust 8 mm PPS tip and stainless steel case reduce risk of damage from physical abuse. The optional FluidLoc cable prevents oil leaks, a common failure mode in high-speed machinery. The probe also seals differential pressure using a Viton O-ring, enhancing reliability in harsh environments.
Installation & Setup Guidance
For optimal performance, mount the 330191-00-70-20-05 with a 3/8-24 UNF thread and ensure maximum thread engagement of 0.563 in. Use the specified torque of 0.565 N·m on connectors. Route the 75Ω triaxial cable away from high-interference sources. The probe does not require an extension cable for 1-meter systems. When using barriers, maintain -23 Vdc to -26 Vdc to avoid reduced linear range. Verify the Viton O-ring seals the probe tip before installation.
Maintenance & Reliability
The 330191-00-70-20-05 reduces maintenance needs through its CableLoc design providing 330 N pull strength and TipLoc robust bonding. Inspect connectors annually for corrosion; gold-plated materials offer high reliability. Follow the temperature schedule: for EPL Ga and Gc, ambient from -55°C to +232°C (T1), down to -55°C to +40°C (T5). The probe weight is 323 g/m. Routine checks of the cable jacket (FEP or PFA) prevent FEP degradation.
Selection Guide & Purchasing Advice
Before ordering, verify the part number breakdown: 330191-00-70-20-05 specifies unthreaded length 0.0 in, overall case length 7 in, total length 2.0 m, and multiple approvals. The probe is available with or without armor; this model is without armor. For replacements, match the original probe length and thread type. PLC Source PRO offers new, factory-packed units with a 12-month warranty. Ensure compatibility with your Bently Nevada extension cables and proximitor.