Product Overview

The 173688-01-20-12-05 is a high-precision 8 mm eddy current proximity probe belonging to the world-renowned 3300 XL series by Bently Nevada. This transducer is engineered to provide non-contacting measurements of shaft vibration and axial displacement in critical rotating machinery. By utilizing electromagnetic induction, the probe detects the distance between the sensor tip and the target surface—typically an AISI 4140 steel shaft—with exceptional linearity and thermal stability. Designed for seamless integration into Turbine Supervisory Instrumentation (TSI) systems, this probe is a fundamental component for predictive maintenance and automated machine protection.

Vital System Parameters and Physical Specifications

• Model Number: 173688-01-20-12-05

• Probe Diameter: 8 mm

• Transducer Series: 3300 XL

• Target Material: Ferromagnetic alloys (Standard calibration: AISI 4140 steel)

• Signal Output: Voltage proportional to the gap distance

• Operating Conditions: High resistance to EMI/RFI interference

• Net Weight: 0.06 kg

• Standard Dimensions: 1.8 x 1.6 x 123 cm

• Interchangeability: Fully compatible with 3300 XL Proximitor sensors and extension cables

• Origin: United States

Industrial Monitoring Deployments

The 173688-01-20-12-05 is extensively utilized in the power generation, oil and gas, and petrochemical sectors to ensure the mechanical integrity of high-speed assets. It is frequently installed on centrifugal compressors, steam turbines, and industrial gearboxes to track radial vibration and axial thrust position. Furthermore, it serves as an accurate Keyphasor reference for phase measurement and rotational speed tracking. Because of its robust construction and high-temperature tolerance, this probe is ideal for monitoring fluid-film bearings where early detection of instability is critical to preventing catastrophic equipment failure and maintaining production line continuity.

FAQ

Q: Is the 173688-01-20-12-05 compatible with older 3300 series monitors?

A: Yes, the 3300 XL 8 mm probes are designed to be backward compatible with non-XL 3300 series 5 mm and 8 mm components, provided the system lengths and calibration settings are correctly matched.

Q: Does this probe require specialized tools for cable connection?

A: No, the 173688-01-20-12-05 features gold-plated ClickLoc coaxial connectors that are designed for finger-tight installation, ensuring a secure, vibration-resistant connection without the need for torque wrenches.

Q: What is the benefit of the eddy current technology used in this sensor?

A: Eddy current technology allows for non-contacting measurement, meaning the probe never touches the rotating shaft. This eliminates mechanical wear on the sensor and ensures that the measurement does not interfere with the machine's operation.

Q: How does the 173688-01-20-12-05 perform in oil-rich environments?

A: The probe tip is molded from high-performance PPS plastic and hermetically sealed, making it highly resistant to the lubricants and process fluids commonly found inside machine housings.

Q: Can this probe be used for axial thrust position monitoring?

A: Absolutely. With a response range starting at 0 Hz (DC), the probe is perfectly suited for measuring the steady-state position (gap) of a shaft, which is essential for identifying thrust bearing wear.