Description

The 21505-00-28-05-02 is an eddy-current, non-contact proximity probe from the Bently Nevada 7200 series, designed to measure shaft vibration and displacement in rotating machinery such as turbines, compressors, and pumpsIt converts the distance between the probe tip and a conductive target into a linear voltage output, enabling real-time condition monitoring and machinery protection.The 21505-00-28-05-02 is a reliable industrial vibration and displacement sensor widely used in condition monitoring and predictive maintenance systems. Its 8 mm probe size, high sensitivity, and rugged construction make it a standard choice for critical rotating equipment protection.

Advanced Engineering FAQ

1. What fundamental measurement principle underpins the operation of the 21505-00-28-05-02?

The 21505-00-28-05-02 operates based on the eddy-current transduction principle, wherein a high-frequency electromagnetic field induces circulating currents in a conductive target. Variations in target displacement modulate the probe impedance, which is subsequently converted into a proportional voltage output via the associated Proximitor.

2. How does the 21505-00-28-05-02 achieve high-fidelity displacement measurement under dynamic operating conditions?

The 21505-00-28-05-02 achieves high-fidelity measurement through its broad frequency response (DC to ~10 kHz) and linearized scale factor (~200 mV/mil), ensuring accurate tracking of both static shaft position and high-frequency vibratory motion in rotating machinery.

3. Why is the probe tip diameter of the 21505-00-28-05-02 specified as 8 mm, and what implications does this have for measurement resolution and target interaction?

The 8 mm tip diameter of the 21505-00-28-05-02 represents an optimized balance between spatial resolution, sensitivity, and electromagnetic field penetration, enabling stable measurements across typical industrial shaft materials while minimizing edge effects and geometric nonlinearity.

4. What constitutes the system architecture required for the 21505-00-28-05-02 to function as a complete measurement chain?

The 21505-00-28-05-02 must be deployed as part of a three-component transducer system, comprising:

• The proximity probe (sensor head)
• A calibrated extension cable (if applicable)
• A Proximitor (signal conditioning unit)
  This integrated system ensures proper impedance matching, calibration integrity, and signal linearization.

5. In what manner does the 21505-00-28-05-02 maintain measurement accuracy across varying thermal environments?

The 21505-00-28-05-02 incorporates temperature-stable materials and calibrated electronics, enabling consistent performance across a wide thermal envelope (approximately −51 °C to +100 °C). System-level compensation within the Proximitor further mitigates thermal drift.

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