21504-00-48-10-00 | Bently Nevada 8 mm Probe Proximity Vibration

Solving Vibration Monitoring Challenges with the 21504-00-48-10-00

When rotating machinery experiences unplanned downtime due to undetected shaft vibration, production losses can escalate quickly. The 21504-00-48-10-00 Bently Nevada 8 mm probe proximity vibration transducer provides a proven solution for continuous, accurate displacement measurement. Engineered for harsh industrial environments, this transducer system helps maintenance teams identify developing faults before they cause catastrophic failure.

Key Features & Technical Specs of the 21504-00-48-10-00

• 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) with ±4% accuracy when calibrated as a system.
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm) with -5% at 10 kHz.
• Power Input: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• 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: Up to 95%, noncondensing.
• System Weight: 1.3 lbs (0.59 kg).
• Tip Diameter: 8 mm with 3/8-24 threads.

A distinctive feature of the 21504-00-48-10-00 is its corrosion resistance for 8 mm probes: operation remains unaffected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF. This makes it ideal for demanding environments where chemical exposure is a concern.

Real-World Applications

In petrochemical plants, the 21504-00-48-10-00 monitors shaft vibration in compressors and turbines, enabling early detection of imbalance or misalignment. Similarly, power generation facilities use this transducer to track rotor displacement in generators, reducing the risk of costly unplanned outages. Its wide frequency response and robust environmental tolerance suit continuous operation in these critical applications.

Installation & Setup

Mount the 8 mm probe with 3/8-24 threads into a suitable mounting bracket or tapped hole, ensuring proper gap setting within the calibrated range. Connect the system to a -17.5 Vdc to -26 Vdc power supply with a maximum consumption of 12 mA. Verify the output scale factor of 200 mV/mil using a calibrated target before commissioning. Always follow Bently Nevada's installation manual for precise gap and cable routing instructions.

Maintenance & Reliability

Regularly inspect the probe tip and cable for physical damage or contamination. Because the 21504-00-48-10-00 is designed for continuous operation, periodic verification of the scale factor and linearity helps maintain measurement accuracy. The corrosion-resistant construction reduces degradation in aggressive environments, extending service life and lowering total cost of ownership.

Compatibility & Integration

The 21504-00-48-10-00 integrates with Bently Nevada 7200 series proximity transducer systems. It outputs a proportional voltage signal (200 mV/mil) that can be fed into compatible monitors, data acquisition systems, or PLCs for real-time vibration analysis. For system-level calibration, pair it with a Bently Nevada proximitor and extension cable to achieve the specified accuracy.

Troubleshooting & Common Issues

If the output signal drifts or shows erratic readings, first check the power supply voltage (must be -17.5 Vdc to -26 Vdc) and verify that the probe gap is within the calibrated range (approximately 10 to 80 mils). Contamination on the probe face can also affect readings; clean gently with a soft cloth. For persistent issues, consult the Bently Nevada troubleshooting guide or contact Petro Auto Tech for support.

FAQ about 21504-00-48-10-00

Q: What is the calibrated range of the 21504-00-48-10-00?

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

Q: What power supply does the 21504-00-48-10-00 require?

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

Q: What is the frequency response of this transducer?

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

Q: Is the 21504-00-48-10-00 resistant to chemicals?

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.

Q: What is the scale factor of the 21504-00-48-10-00?

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

Product Support & Availability

The 21504-00-48-10-00 is available as new and original in factory packing. In stock and ready to ship from Petro Auto Tech. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.