172103-01 specialized proximity probe target disc

BENTLY 172103-01 is a specialized proximity probe target disc (also known as a "shaft collar" or "reference target") developed by Bently Nevada, specifically designed for use with eddy current proximity probes in the 3300 Series and 3500 Series Machinery Protection Systems. As a critical auxiliary component for rotating machinery position and speed monitoring, it provides a precise, uniform surface for proximity probes to detect shaft rotation, axial movement, or speed—ensuring accurate measurement of parameters like rotor eccentricity, thrust position, and RPM. Its industrial-grade design ensures compatibility with harsh operating environments (e.g., high temperatures, vibration) in power generation, oil & gas, and petrochemical industries. The detailed information is as follows:

1. Basic Overview

Category	Details
Product Type	Eddy current proximity probe target disc (for rotating machinery shaft monitoring)
Part Number	172103-01
Design Type	Single-piece, solid metallic target – optimized for eddy current signal detection (no slots or notches by default; slotted variants available via custom order for speed sensing)
Material Composition	AISI 4140 alloy steel (heat-treated to 30–35 HRC hardness) – balances magnetic permeability, electrical conductivity, and mechanical durability (critical for consistent eddy current signal response)
Key Dimensions	- Outer Diameter: 50.8 mm (2 inches) - Inner Diameter: 25.4 mm (1 inch) – compatible with standard 1-inch diameter shafts - Thickness: 6.35 mm (0.25 inches) – ensures stable mounting and sufficient surface area for probe detection
Weight	Approximately 0.12 kg (varies slightly with machining tolerances)
Operating Temperature Range	-50°C to +200°C – suitable for high-temperature machinery environments (e.g., turbine shafts, compressor rotors)
Surface Finish	1.6 μm Ra (polished) – minimizes surface irregularities that could cause false eddy current signals; ensures uniform signal output from the proximity probe

2. Core Technical Specifications (Critical for Probe Compatibility)

The 172103-01 target disc is engineered to match the performance characteristics of Bently Nevada’s eddy current proximity probes, ensuring reliable signal transmission and measurement accuracy.

2.1 Eddy Current Signal Compatibility

Electrical Conductivity: 45 S/m (at 25°C) – optimized for Bently’s 3300/3500 series proximity probes (which rely on eddy current induction to measure distance). This conductivity ensures a strong, stable signal between the probe and target, avoiding weak or erratic readings.
Magnetic Permeability: 1.01 × 10⁻⁶ H/m (relative permeability ≈ 1.2) – non-magnetic to prevent magnetic interference with the probe’s eddy current field (critical for applications like generator rotor monitoring, where magnetic fields are present).
Signal Uniformity: ±0.02 mm total indicator runout (TIR) – ensures the target’s surface remains concentric with the shaft during rotation. This minimizes signal fluctuations caused by target eccentricity, which could trigger false alarms.