330191-00-08-15-05 Bently Nevada 3300 XL 8 mm ETR Probe

When Differential Pressure Threatens Probe Reliability

In a steam turbine retrofit, engineers observed erratic vibration readings from a legacy probe. The root cause was moisture ingress through a compromised cable seal. The Bently Nevada 330191-00-08-15-05 solves this with a Viton O-ring that seals differential pressure between tip and case. This 3300 XL 8 mm ETR probe delivers engineering-grade precision for critical machinery protection.

330191-00-08-15-05 Technical Specifications

• Input Voltage: -17.5 Vdc to -26 Vdc (nonincendive); -23 Vdc to -26 Vdc with barriers
• Output Current: 12 mA maximum consumption
• Isolation: Not specified; refer to official datasheet
• Total Length: 1.5 m (4.9 ft)
• Probe Tip Material: Polyphenylene sulfide (PPS)
• Case Material: AISI 303 or 304 stainless steel
• Thread: 3/8-24 UNF, max engagement 0.563 in
• Nominal DC Resistance: 7.73 Ω ± 0.50 Ω
• Output Resistance: 50 Ω
• Tensile Strength: 330 N (75 lbf) probe case to lead

Key Features and Engineering-Grade Accuracy

The 330191-00-08-15-05 incorporates patented TipLoc molding for a robust tip-to-body bond. Its CableLoc design provides 330 N pull strength. The 8 mm probe body offers thicker PPS encapsulation and a stronger stainless steel case. Therefore, it resists physical abuse better than smaller probes. Supply sensitivity is less than 2 mV per volt, ensuring stable output. The probe operates with Bently Nevada extension cables and proximitors to meet entity parameters.

Applications and Use Cases

This probe suits steam turbines, compressors, and pumps where differential pressure sealing is critical. For instance, in a petrochemical plant, the 330191-00-08-15-05 monitored axial displacement on a high-pressure compressor. Its CSA, ATEX, and IECEx approvals allow use in hazardous areas. The 1.5 m total length fits installations with limited space. Because the probe lacks armor, it is ideal for routes protected from mechanical damage.

Installation and Setup

Mount the probe using the 3/8-24 UNF thread, ensuring maximum engagement of 0.563 in. Connect to a Bently Nevada proximitor and extension cable. Verify that supply voltage stays within -17.5 Vdc to -26 Vdc for nonincendive circuits. Operation above -23.5 Vdc may reduce linear range. Do not exceed 0.565 N·m (5 in·lbf) connector torque. For one-meter systems, no extension cable is used.

Maintenance and Reliability

Inspect the probe periodically for seal integrity and cable damage. The Viton O-ring is a wear point; replace if differential pressure sealing degrades. Avoid exposing the probe to temperatures beyond its classification. For EPL Ga/Gc, ambient range is -55°C to +232°C (T1) or narrower for higher T classes. The stainless steel case resists corrosion, but check for thread wear. Following these steps extends service life and maintains measurement accuracy.

Ordering and Support

Contact AutoDCSTech with your exact requirements for precise matching. The 330191-00-08-15-05 is in stock and ready to ship. Please verify current lifecycle status and availability with AutoDCSTech before ordering.