The GE / Bently Nevada 21508-02-12-05-02 is an 8mm reverse mount proximity probe for non-contact vibration and displacement monitoring in rotating machinery. Based on eddy current measurement principles, this probe delivers precise gap-to-voltage transduction across industrial applications including turbines, compressors, pumps, and motors. The probe features polyphenylene sulfide (PPS) construction, enabling operation in harsh environments with direct exposure to oil, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF without performance degradation.
## Technical Specifications
• **Measurement Range:** 0.25 mm to 2.0 mm (0.010 to 0.080 inches); 80 mils linear range
• **Accuracy:** ±0.02 mm; ±2% of full scale
• **Resolution:** 0.0001 inches (0.0025 mm)
• **Scale Factor:** 200 mV/mil; 7.87 V/mm; 8 V/mm
• **Linearity:** Within 0.8 mils (0.02 mm) of 200 mV/mil calibrated line; within 2.3 mils (0.06 mm) including interchangeability errors
• **Frequency Response:** DC to 10 kHz (0 to 600,000 cpm); -5% at 10 kHz
• **Operating Temperature:** -30°F to +350°F (-34°C to +177°C) for probe and extension cable
• **Power Supply:** -17.5V to -26V DC at 12 mA maximum consumption
• **Output Signal:** 200 mV/mil
## Key Features
• Compact 8mm reverse mount tip with miniature male coaxial connector
• Non-contacting eddy current transducer for static and dynamic distance measurement
• Material composition resists chemical attack and moisture ingress
• Available cable lengths: 0.5 m, 1.0 m, 5.0 m, 9.0 m with specified tolerances
• Includes 3/8-24 adapters and flexible cable
## Typical Applications
• Shaft position monitoring on turbomachinery
• Vibration measurement on rotating equipment
• Dynamic gap sensing in compressors and pumps
• Motor condition monitoring
## Compatibility & Integration
This probe integrates with the Bently Nevada 7200 Series Proximity Transducer Systems. Output signal conforms to 200 mV/mil standard for proximity measurement systems.
