21504-00-76-05-02 | Bently Nevada 8 mm Proximity Probe Vibration Transducer

Solving Vibration Monitoring Challenges with the 21504-00-76-05-02

When rotating machinery experiences unexpected vibration, the 21504-00-76-05-02 from Bently Nevada provides reliable, real-time data. This 8 mm proximity probe transducer system is engineered for continuous monitoring in harsh industrial environments. With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil, it delivers accurate measurements to help prevent costly downtime.

Key Features and Technical Specifications

• Power input: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Calibrated range: 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face.
• Scale factor: 200 mV/mil (7.87 V/mm), ±4% when calibrated as a system.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line when calibrated as a system.
• Frequency response: 0 to 10 kHz (0 to 600,000 cpm); -5% at 10 kHz.
• Operating temperature: Proximitor -60°F to +212°F (-51°C to +100°C); probe and extension cable -30°F to +350°F (-34°C to +177°C).
• Relative humidity: To 95%, noncondensing.
• System weight: 1.3 lbs (0.59 kg).

Real-World Applications

In industries such as oil and gas, power generation, and manufacturing, the 21504-00-76-05-02 monitors shaft vibration and position in turbines, compressors, and pumps. Its robust design withstands direct contact with air, water, lube oil, and certain chemicals, making it suitable for demanding environments. The probe's 8 mm diameter and standard 3/8-24 threads simplify installation into existing bearing housings.

Installation and Setup

Mount the probe with the specified 3/8-24 threads and ensure the unthreaded length is 0 mm per the ordering option. The total length of 0.5 meter (20 inches) with a miniature male coaxial connector allows flexible routing. For optimal performance, maintain the recommended gap of approximately 10 mils (0.25 mm) from the target surface. Always follow Bently Nevada's installation manual for precise positioning.

Maintenance and Reliability

Regularly inspect the probe and cable for physical damage or contamination. The system's corrosion resistance for 8 mm probes ensures reliable operation even in harsh chemical environments. Periodically verify the scale factor and linearity per the manufacturer's guidelines to maintain measurement accuracy. With proper care, the 21504-00-76-05-02 delivers long-term, dependable service.

Compatibility and Integration

This proximity probe is part of the Bently Nevada 7200 Proximity Transducer Systems family. It works with compatible Bently Nevada monitors and condition monitoring systems. The 200 mV/mil output integrates seamlessly with data acquisition modules for real-time vibration analysis. For specific system integration details, refer to the official Bently Nevada documentation.

Frequently Asked Questions

What is the calibrated range of the 21504-00-76-05-02?

The calibrated range is 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face.

What is the scale factor of this proximity probe?

The scale factor is 200 mV/mil (7.87 V/mm), with a tolerance of ±4% when calibrated as a system.

What is the operating temperature range for the probe?

The probe and extension cable operate from -30°F to +350°F (-34°C to +177°C).

Is the 21504-00-76-05-02 resistant to chemicals?

Yes, for 8 mm probes, operation is not affected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.

Product Support and Availability

The 21504-00-76-05-02 is available as new and original in factory packing from Petro Auto Tech. Each unit includes a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.