330191-00-08-50-CN Bently Nevada 8 mm Proximity Probe, 5 m

Product Overview: 330191-00-08-50-CN Proximity Probe

The 330191-00-08-50-CN is a Bently Nevada 3300 XL 8 mm eddy current proximity probe engineered for exact displacement and vibration measurement in rotating machinery. As a maintenance engineer, you need a probe that delivers verified accuracy and survives harsh industrial environments. This model features a 3/8-24 UNF thread, a 5.0-meter extended temperature range (ETR) cable, and a rugged PPS probe tip. The 3300 XL series incorporates patented TipLoc and CableLoc designs for robust mechanical integrity. Consequently, the probe maintains signal integrity even under continuous machine operation.

Key Specifications of the 330191-00-08-50-CN

• Input Voltage: Requires -17.5 Vdc to -26 Vdc when installed with a nonincendive circuit per drawing 140979.
• Output Current: 12 mA maximum consumption.
• Isolation: Not specified; refer to official datasheet.
• Probe Length: 5.0 meters (16.4 feet) total length.
• Probe DC Resistance: 8.73 Ω ± 0.50 from center conductor to outer conductor.
• Output Resistance: 50 Ω.
• Supply Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.
• Probe Tip Material: Polyphenylene sulfide (PPS).
• Probe Case Material: AISI 303 or 304 stainless steel.
• Cable Type: 75 Ω triaxial, FEP-insulated ETR cable.
• Tensile Strength: 330 N (75 lbf) probe case to probe lead; 270 N (60 lbf) at extension cable connectors.
• Connector Material: Gold-plated brass or gold-plated beryllium copper.
• Maximum Connector Torque: 0.565 N·m (5 in·lbf).
• Thread Engagement: 3/8-24 UNF, maximum length 0.563 in.
• Weight: 323 g/m (11.4 oz).
• Agency Approval: CN (Country Specific Approval).

Installation and Maintenance Best Practices

Proper installation ensures the 330191-00-08-50-CN delivers engineering-grade precision. Mount the probe using the 3/8-24 UNF thread and verify that the unthreaded length is at minimum 0.0 in. and the overall case length is at minimum 0.8 in. Because the probe operates with a -17.5 Vdc to -26 Vdc supply, confirm your Proximitor sensor matches the 5-meter system length. The probe seals differential pressure with a Viton O-ring, but it is not pressure tested prior to shipment. For maintenance, inspect the probe tip and cable periodically for physical damage. The patented CableLoc design provides 330 N pull strength, yet you should avoid excessive force during handling. Additionally, the ETR cable withstands ambient temperatures from -55°C to +232°C for T1 classification. Therefore, schedule routine checks to prevent unexpected downtime.

Applications and Compatibility

The 330191-00-08-50-CN excels in steam turbines, compressors, and pumps where precise radial vibration monitoring is critical. Its 8 mm probe body offers thicker encapsulation, making it more rugged against physical abuse. For compatibility, use only Bently Nevada extension cables and Proximitor sensors. The 5-meter probe is designed for use with the 5-meter Proximitor sensor exclusively. If you require integration with other systems, consult the manufacturer for approved interfaces. Overall, this probe provides reliable performance in oil and gas, power generation, and heavy industry.