21504-00-64-10-02 | Bently Nevada 8 mm Probe Proximity Vibration Transducer

Introduction to the 21504-00-64-10-02 Proximity Probe

When unplanned vibration threatens rotating machinery, the 21504-00-64-10-02 from Bently Nevada provides critical early warning. This 8 mm probe proximity vibration transducer is engineered for continuous monitoring of shaft displacement and vibration in industrial environments. With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil (7.87 V/mm), it delivers accurate, repeatable measurements for predictive maintenance programs.

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 probe face.
• Scale factor: 200 mV/mil (7.87 V/mm), ±4% when calibrated as a system; within ±9.5% including interchangeability errors.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line when calibrated as a system; within 2.3 mils (0.06 mm) including interchangeability errors.
• Frequency response: 0 to 10 kHz (0 to 600,000 cpm); -5% at 10 kHz (600,000 cpm).
• Temperature sensitivity: Typically -3% change in scale factor at +150°F (+65°C) at 50 mils gap (1.27 mm).
• 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).

The distinctive 200 mV/mil scale factor ensures high-resolution data for early fault detection, reducing the risk of catastrophic machine failure.

Real-World Applications

In critical rotating equipment such as turbines, compressors, and pumps, the 21504-00-64-10-02 monitors shaft vibration and position. Its 8 mm probe diameter fits standard mounting configurations, and the probe’s corrosion resistance to air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF makes it suitable for harsh industrial environments. By providing continuous, accurate data, this transducer supports condition-based maintenance strategies that minimize unplanned downtime.

Installation and Setup Guidance

Mount the probe using the 3/8-24 thread configuration, ensuring the unthreaded length is 0 mm and overall case length is 6.4 inches. The total cable length is 1.0 meter (39 inches) with a tolerance of +0.25 meter, -0.10 meter. Connect via the miniature male coaxial connector (option 02). Proper gap setting is critical: the calibrated range begins at approximately 10 mils (0.25 mm) from the probe face. Always follow Bently Nevada’s installation manual for precise positioning and wiring.

Maintenance and Reliability

Routine inspection of the probe and cable for physical damage ensures long-term reliability. The system operates reliably in temperatures from -60°F to +212°F for the Proximitor and -30°F to +350°F for the probe and extension cable. With a 12-month factory warranty and new original factory packing, the 21504-00-64-10-02 delivers dependable performance for years. Regular calibration verification against the 200 mV/mil scale factor helps maintain measurement accuracy.

Compatibility and Integration

This transducer is part of the Bently Nevada 7200 Proximity Transducer Systems family. It integrates seamlessly with Bently Nevada monitors and diagnostic equipment. For system-level calibration, pair the probe with a compatible Proximitor and extension cable to achieve the specified ±4% accuracy. Contact Petro Auto Tech for assistance with integration into existing monitoring networks.

Frequently Asked Questions

Q: What is the calibrated range of the 21504-00-64-10-02?

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

Q: What is the scale factor of this probe?

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

Q: What power supply does the 21504-00-64-10-02 require?

A: It requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.

Q: What is the operating temperature range for the probe?

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

Q: Is the probe resistant to corrosive environments?

A: 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 Bently Nevada 21504-00-64-10-02 is in stock and ready to ship from Petro Auto Tech. As a trusted industrial automation parts supplier, Petro Auto Tech offers new and original factory-packed units with a 12-month warranty. Contact us for current lifecycle status and ordering details.