Description

21508-02-12-05-02 | Bently Nevada | Probe Proximity Vibration

### Product Description
The 21508-02-12-05-02 is a non-contact eddy-current proximity probe designed for shaft vibration and position monitoring in rotating machinery.
Moreover, it delivers high-resolution displacement measurements for continuous condition monitoring in critical turbomachinery applications.
Therefore, it is commonly integrated with Bently Nevada 3500 or System 1 monitoring platforms for real-time rotor dynamics analysis.

### Technical Specifications

### Typical Applications
– Gas turbine shaft vibration monitoring
– Steam turbine differential expansion measurement
– Compressor axial position and thrust bearing monitoring
– Motor-generator rotor eccentricity detection
– Centrifugal pump shaft runout assessment

### FAQ
What is the standard output signal?
It produces a 4–20 mA analog signal proportional to gap voltage, compatible with Bently Nevada monitoring systems.

Is calibration required before installation?
Yes—probe sensitivity must be calibrated using the corresponding extension cable and monitor module per API 670.

Can this probe operate in high-temperature environments?
No—it is rated for ambient temperatures up to +121°C; high-temp variants require different part numbers.

What is the nominal sensing range?
The standard linear range is 2.0 mm (0.08 in) with a 5.0 mm probe tip diameter.

Does it require a specific extension cable?
Yes—must be used with Bently Nevada 3300 XL series extension cables matching the probe’s part number suffix.

### SEO Title
Bently Nevada 21508-02-12-05-02 Proximity Probe

### Meta Description
Bently Nevada 21508-02-12-05-02 proximity probe delivers precise shaft vibration data for turbomachinery protection. Specify compatibility and order certified replacement today.