The GE / Bently Nevada 21508-02-12-05-02 is an 8 mm reverse mount proximity probe that performs non-contact eddy current measurement of static and dynamic distances on rotating and reciprocating machinery. It delivers precision displacement data for vibration monitoring, shaft runout measurement, and axial thrust position detection across industrial applications including turbines, compressors, pumps, motors, and generators.
Technical Specifications
Measurement Performance
• Sensing range: 0.25 to 1.25 mm
• Measurement range: 0 to 5 mm (0 to 0.2 inches)
• Accuracy: ±2% of full scale
• Linearity: ±0.02 mm (0.8 mils) when calibrated as system; ±0.06 mm (2.3 mils) including interchangeability errors
• Resolution: 0.0025 mm (0.0001 inches)
• Output scale factor: 200 mV/mil (7.87 V/mm) at ±4% accuracy
• Frequency response: DC to 10 kHz (0 to 600,000 cpm) at −5% at 10 kHz
• Temperature sensitivity: −3% scale factor change at +65°C (referenced to 1.27 mm gap)
Electrical
• Input power: −17.5 Vdc to −26 Vdc at 12 mA maximum
• Output signal: Voltage output (200 mV/mil)
• Cable length: 0.5 meters (20 inches)
• Connector: Miniature male coaxial
– Key Features
• Eddy current-based non-contact measurement technology
• API 670 compliant
• 8 mm probe tip diameter
• Reverse mount configuration for tight installation spaces
• ±2% accuracy across full scale with 0.0025 mm resolution
• DC to 10 kHz frequency response suitable for continuous and transient monitoring
– Typical Applications
Shaft position and vibration monitoring on rotating machinery including steam and gas turbines, compressors, pumps, centrifuges, electric motors, and generators. Shaft runout and axial thrust position measurement.
– Compatibility & Integration
Component of the Bently Nevada 7200 Series Proximity Transducer System. Compatible with Bently Nevada 3300 XL Series and 9000 Monitoring Systems.
