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

Product Overview: 330191-00-08-05-05 Proximity Probe

The Bently Nevada 330191-00-08-05-05 is a 3300 XL 8 mm ETR proximity probe engineered for exact displacement and vibration measurement in rotating machinery. Because of its 0.5-meter total length and 3/8-24 UNF thread, it integrates seamlessly into tight installation spaces. Consequently, this probe reduces downtime and maintenance costs by delivering verified, repeatable data for condition monitoring systems.

Key Specifications and Cost-Efficiency

Each specification of the 330191-00-08-05-05 directly influences operational cost and measurement accuracy. The table below details critical parameters.

• Input Voltage: Requires -17.5 Vdc to -26 Vdc; operation at more positive than -23.5 Vdc reduces linear range.
• Output Current: 12 mA maximum consumption.
• Isolation: Not specified; refer to official datasheet.
• Probe DC Resistance: 7.45 ± 0.50 Ω at 0.5 m.
• Total Length: 0.5 meter (1.6 feet).
• Thread: 3/8-24 UNF, maximum engagement 0.563 in.
• Case Material: AISI 303 or 304 stainless steel.
• Tip Material: Polyphenylene sulfide (PPS).
• Agency Approvals: CSA, ATEX, IECEx.

For example, the 330 N (75 lbf) tensile strength of the TipLoc and CableLoc designs prevents cable pull-out, avoiding costly false trips and emergency repairs. Additionally, the -17.5 Vdc to -26 Vdc input range ensures compatibility with standard Bently Nevada proximitors, eliminating the need for additional power conditioning equipment.

Applications and Use Cases

This probe excels in harsh industrial environments where precise vibration monitoring is critical. For instance, in steam turbine applications, the 330191-00-08-05-05 detects radial shaft vibration with sub-micron accuracy, preventing catastrophic failures that cost millions in lost production. Furthermore, its ATEX and IECEx approvals allow deployment in hazardous areas, reducing the need for expensive purging or isolation systems. In compressor monitoring, the 0.5-meter length minimizes cable runs, lowering installation labor and material costs.

Installation and Maintenance

Proper installation is essential for accurate measurements. Mount the probe using the 3/8-24 UNF thread, ensuring the maximum thread engagement of 0.563 in. is not exceeded. Because the probe operates with a -17.5 Vdc to -26 Vdc supply, verify that the proximitor provides the correct voltage. For maintenance, inspect the probe tip and cable periodically for physical damage. The Viton O-ring seals differential pressure, but probes are not pressure tested prior to shipment. Therefore, handle with care during installation. The 3300 XL 8 mm design offers a thicker PPS encapsulation, extending service life and reducing replacement costs.