Bently Nevada 173688-01-20-12-05 3300 XL 8 mm Proximity Probe

Product Overview

When machinery vibration threatens uptime, the Bently Nevada 173688-01-20-12-05 3300 XL 8 mm Proximity Probe delivers reliable, continuous shaft displacement monitoring. Designed for maintenance engineers who demand accuracy and durability, this probe integrates seamlessly into turbine, compressor, and pump protection systems. Its robust construction minimizes false trips and extends service intervals.

Technical Specifications

Manufacturer: Bently Nevada

Product Number: 173688-01-20-12-05

Product Type: 3300 XL 8 mm Proximity Probe

Mounting Thread: 1/2-14 NPT

Unthreaded Length Option: 01 = 0.1 in

Overall Case Length Option: 20 = 2.0 in

System Length: 20 = 2.0 meters (6.6 feet)

Connector and Cable-Type Option: 12 = Miniature ClickLoc coaxial connector, FluidLoc cable

Agency Approval Option: 05 = CSA, ATEX, IECEx Approvals

Probe Tip Material: Polyphenylene sulfide (PPS)

Probe Case Material: AISI 303 or 304 stainless steel (SST)

Weight: 0.323 kg

Industry Applications

Maintenance teams rely on the 173688-01-20-12-05 for critical rotating equipment in oil and gas, power generation, and petrochemical plants. The probe monitors radial shaft vibration and axial position in steam turbines, centrifugal compressors, and large pumps. Its PPS tip resists chemical attack, while the stainless steel case withstands harsh environments. The FluidLoc cable option provides extra protection in oil-wetted areas, reducing cable degradation over time.

Installation & Setup Guidance

Mount the probe using the 1/2-14 NPT thread into a standard mounting boss. Ensure the unthreaded length of 0.1 in positions the tip correctly relative to the shaft. The overall case length of 2.0 in fits most bearing housings. Route the 2.0-meter FluidLoc cable away from high-heat sources and sharp edges. Connect the Miniature ClickLoc coaxial connector to the extension cable, verifying a secure click. Calibrate the system per Bently Nevada guidelines to achieve accurate gap voltage.

Maintenance & Reliability

Inspect the probe tip and cable periodically for wear or contamination. The stainless steel case resists corrosion, but verify the O-ring seal integrity during each outage. Avoid overtightening the mounting thread to prevent case distortion. The CSA, ATEX, and IECEx approvals confirm the probe meets global safety standards for hazardous locations. Regular calibration checks every 12 months help maintain measurement accuracy and extend probe life.

Selection Guide & Purchasing Advice

Before ordering the 173688-01-20-12-05, confirm your system length requirement: this model includes a 2.0-meter cable. Verify the mounting thread matches your installation boss (1/2-14 NPT). For applications with continuous oil immersion, the FluidLoc cable option is recommended. BluePLC Industrial stocks this probe and can advise on compatible extension cables and proximity transmitters. Contact us to verify current lifecycle status and availability.