21504-24-64-05-02 | Bently Nevada 8mm Proximity Probe Vibration

Introduction to the Bently Nevada 21504-24-64-05-02

In the world of industrial rotating machinery, vibration monitoring has evolved from a simple maintenance task into a critical predictive strategy. The 21504-24-64-05-02 from Bently Nevada represents a key component in this evolution, offering precise, reliable shaft vibration measurement for turbomachinery, pumps, and compressors. As part of the 7200 series, this proximity probe is engineered to deliver accurate data that helps operators detect issues before they become failures.

With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil (7.87 V/mm), the 21504-24-64-05-02 provides high-resolution readings essential for effective condition monitoring. Its robust design and environmental resilience make it suitable for demanding industrial settings.

Key Features and Technical Specifications

The 21504-24-64-05-02 is packed with features that enhance its performance and usability. Below are the core specifications that define this proximity probe:

• Part Number: 21504-24-64-05-02
• Model: Probe Proximity Vibration
• Manufacturer: Bently Nevada
• Total Length: 0.5 metre (20 inches), tolerance +0.13 metre / -0.05 metre (+5 inches / -2 inches)
• Power Supply: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption
• Calibrated Range: 80 mils (2.0 mm), begins at approximately 10 mils (0.25 mm) from probe face
• Scale Factor: 200 mV/mil (7.87 V/mm), ±4% if 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 if 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
• 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: Up to 95%, noncondensing
• System Weight: 1.3 lbs (0.59 kg)

These specifications highlight the probe's ability to deliver consistent, accurate vibration data across a wide range of operating conditions.

Applications and Use Cases

The 21504-24-64-05-02 is commonly used in industries where rotating equipment reliability is paramount. Typical applications include monitoring shaft vibration in turbines, compressors, pumps, and generators. Its 8 mm diameter and standard case configuration allow for easy integration into existing machinery.

For example, in a petrochemical plant, this probe can be installed on a critical pump to continuously monitor vibration levels. Early detection of abnormal vibration patterns enables maintenance teams to schedule repairs during planned downtime, reducing unplanned outages and saving significant costs.

Installation and Setup

Proper installation is essential for achieving accurate measurements with the 21504-24-64-05-02. The probe comes with a 3/8-24 thread and a miniature male coaxial connector, simplifying mounting and connection. Ensure that the probe face is positioned correctly relative to the shaft surface, typically starting at approximately 10 mils (0.25 mm) gap, to operate within the calibrated range.

When routing the extension cable, avoid sharp bends and excessive tension to prevent damage. Verify that the power supply meets the required -17.5 Vdc to -26 Vdc range and that the total current consumption does not exceed 12 mA. Following these guidelines helps maintain measurement accuracy and system reliability.

Maintenance and Reliability

Regular maintenance of the 21504-24-64-05-02 ensures long-term performance. Periodically inspect the probe and cable for physical damage, and verify that the mounting remains secure. The probe is designed to withstand direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF, making it corrosion-resistant for 8 mm probes.

Given its robust construction and environmental tolerance, this probe offers reliable operation in harsh industrial environments. Routine checks, as recommended by the manufacturer, will help maintain its accuracy and extend its service life.

Compatibility and Integration

The 21504-24-64-05-02 is part of the Bently Nevada 7200 proximity transducer system, designed to work seamlessly with compatible monitors and diagnostic equipment. Its standard output scale factor of 200 mV/mil ensures easy integration with existing vibration monitoring systems.

For specific compatibility details, refer to the Bently Nevada documentation or contact Petro Auto Tech for guidance. Ensuring proper system integration is key to achieving reliable vibration data.

Troubleshooting and Common Issues

If the probe does not provide accurate readings, common issues include incorrect gap settings, cable damage, or power supply problems. Verify that the probe gap is within the calibrated range (starting at approximately 10 mils) and that the power supply voltage is within the specified range.

Also, check for any loose connections or damaged cables. If issues persist, consult the official Bently Nevada manual or reach out to Petro Auto Tech for technical support.

FAQ about the 21504-24-64-05-02

Q: What is the calibrated range of the 21504-24-64-05-02?

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 is required for this probe?

A: The probe requires a power supply of -17.5 Vdc to -26 Vdc, with a maximum consumption of 12 mA.

Q: What is the frequency response of the 21504-24-64-05-02?

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

Q: What is the operating temperature range for the probe and extension cable?

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

Q: Is the 21504-24-64-05-02 corrosion-resistant?

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 21504-24-64-05-02 is available from Petro Auto Tech, an industrial automation parts supplier. It is offered as new and original in factory packing, with a 12-month factory warranty. For current availability and lifecycle status, please contact Petro Auto Tech.