Bently Nevada 137504-08 Shaft Vibration Probe

Product Description

The 137504-08 is a heavy-duty 3300 XL 8 mm Proximity Probe Assembly engineered by Bently Nevada for high-precision, non-contact vibration and displacement measurements on critical rotating machinery. This industrial sensor package integrates a high-frequency probe tip directly with an 8-foot (approximately 2.4 meters) armored integral cable. 

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Product Series / Line: 3300 XL Transducer System

• Product Number: 137504-08

• Sensor Tip Diameter: 8 mm

• Integral Cable Length: 8 feet (approx. 2.4 meters)

• Probe Body Material: Grade-stabilized stainless steel

• Tip Material Composition: High-performance PPS (Polyphenylene Sulfide)

• Cable Core Insulation: FEP (Fluoroethylene Propylene) high-temperature jacket

• Sensor Head Operating Temperature Range: -52 to +177 degrees C (-62 to +351 degrees F)

• Companion Proximitor Sensor Temperature Limit: -52 to +100 degrees C (-62 to +212 degrees F)

• Typical Linear Displacement Span: 2 mm to 5 mm range limits

• Mounting Thread Matrix: 1/4-28 UNF or M8 x 1 options (dependent on physical configuration ordered)

• Environmental Seal Factor: Up to 100% condensing humidity capacity when connector insulation boots are correctly deployed

• Minimum Permitted Cable Bend Radius: 25.4 mm (1.0 inch)

• Case-to-Cable Maximum Tensile Grip: 330 N (75 lbf)

• Interconnect Click-Lock Tensile Limit: 270 N (60 lbf)

• Industry Directives Compliance: Fully certified to API 670 4th Edition frameworks

Industrial Application Scenarios

The 137504-08 8mm proximity probe assembly is installed inside the fluid-film bearing housings of multi-megawatt steam and gas turbines, high-pressure hydrocarbon gas compressors, main cooling water pumps, and heavy generator exciters. In these heavy utility machines, direct mechanical contact with the spinning shaft would instantly destroy standard sensors. The 137504-08 is mounted directly through the bearing casing, pointing straight at the rotating shaft across a tiny micro-gap. It reads changes in the gap to feed continuous data into a Bently Nevada 3500 monitoring rack, enabling immediate automated machinery shutdowns if a shaft shifts off-center or exceeds vibration thresholds.