21504-00-72-10-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the Bently Nevada 21504-00-72-10-02

When machinery vibration threatens uptime, the 21504-00-72-10-02 from Bently Nevada delivers precise proximity measurement. This 8 mm probe is part of the 7200 Proximity Transducer Systems family. It operates on -17.5 Vdc to -26 Vdc power at 12 mA maximum consumption. The unit provides a calibrated range of 80 mils (2.0 mm), starting at approximately 10 mils (0.25 mm) from the probe face. With a scale factor of 200 mV/mil (7.87 V/mm), it offers ±4% accuracy when calibrated as a system. Linearity remains within 0.8 mils (0.02 mm) of a 200 mV/mil straight line under system calibration.

Key Features and Technical Specifications of the 21504-00-72-10-02

• Diameter: 8 mm probe tip.
• Configuration Thread: 3/8-24.
• Unthreaded Length: 0 mm.
• Overall Case Length: 7.2 inches.
• Total Length: 1.0 meter (39 inches) with tolerance +0.25 m, -0.10 m.
• Connector: Miniature male coaxial connector.
• Power Input: -17.5 Vdc to -26 Vdc at 12 mA max.
• Calibrated Range: 80 mils (2.0 mm).
• Scale Factor: 200 mV/mil (7.87 V/mm) ±4% as system.
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm).
• Operating Temperature (Probe): -30°F to +350°F (-34°C to +177°C).
• Relative Humidity: Up to 95%, noncondensing.
• System Weight: 1.3 lbs (0.59 kg).

The frequency response of 0 to 10 kHz ensures accurate vibration monitoring across a wide range of rotating speeds. This makes the 21504-00-72-10-02 suitable for high-speed machinery where early fault detection is critical.

Applications and Use Cases

Engineers use the 21504-00-72-10-02 in turbomachinery, compressors, and pumps to monitor shaft vibration and position. Its 8 mm probe fits standard mounting configurations. The corrosion-resistant design for 8 mm probes allows operation in air, water, lube oil, and several chemicals. This reliability reduces unplanned downtime in harsh industrial environments.

Installation and Setup

Mount the probe with a 3/8-24 thread into a suitable bracket or housing. Ensure the gap between probe face and target is within the calibrated range of 10 to 80 mils. Use the miniature male coaxial connector for signal output. Verify power supply meets -17.5 Vdc to -26 Vdc at 12 mA maximum. For system calibration, follow Bently Nevada guidelines to achieve ±4% scale factor accuracy.

Maintenance and Reliability

Inspect the probe and cable periodically for physical damage. Keep the probe face clean and free of debris. The unit withstands temperatures from -30°F to +350°F (-34°C to +177°C) and humidity up to 95% noncondensing. Regular checks help maintain measurement integrity and extend service life.

Compatibility and Integration

The 21504-00-72-10-02 integrates with Bently Nevada 7200 series proximity transducer systems. It works with compatible monitors and diagnostic equipment that accept 200 mV/mil input. The 1.0 meter cable length suits typical installation distances. For longer runs, consult Bently Nevada extension cable options.

Troubleshooting and Common Issues

If output readings drift, verify power supply voltage is within -17.5 Vdc to -26 Vdc. Check cable connections for damage or corrosion. Ensure the probe gap is within the calibrated range. For linearity errors beyond 0.8 mils (system) or 2.3 mils (with interchangeability), recalibrate the system. Temperature sensitivity typically changes scale factor by -3% at +150°F (+65°C) at 50 mils gap.

Frequently Asked Questions about the 21504-00-72-10-02

Q: What is the calibrated range of the 21504-00-72-10-02?

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

Q: What power supply does this probe require?

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

Q: What is the frequency response of the 21504-00-72-10-02?

A: The frequency response is 0 to 10 kHz (0 to 600,000 cpm), with -5% at 10 kHz.

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: What connector type does this model use?

A: It uses a miniature male coaxial connector.

Product Support and Availability

The 21504-00-72-10-02 is available as new and original in factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.