21505-16-40-05-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the Bently Nevada 21505-16-40-05-02

Over the decades, industrial machinery monitoring has evolved from simple manual inspections to sophisticated electronic systems that continuously track equipment health. The 21505-16-40-05-02 from Bently Nevada represents this evolution, offering precise vibration measurement for rotating machinery. As part of the 7200 Proximity Transducer Systems, this probe is engineered for reliability and accuracy in demanding environments.

With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil, the 21505-16-40-05-02 delivers consistent performance. Its 8 mm diameter and standard case make it a versatile choice for various industrial applications.

Key Features and Technical Specifications

The 21505-16-40-05-02 is built to provide accurate vibration data, essential for predictive maintenance and machine protection. Here are the core specifications:

• Part Number: 21505-16-40-05-02
• Model: Probe Proximity Vibration
• Manufacturer: Bently Nevada
• Total Length: 0.5 metre (20 inches), tolerance +0.13 metre / -0.05 metre
• Power Requirement: -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% (system calibrated), ±9.5% including interchangeability errors
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line (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)
• Operating Temperature (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)

One distinctive aspect is the frequency response of 0 to 10 kHz, which covers a wide range of machine speeds, making it suitable for high-speed rotating equipment.

Applications and Use Cases

The 21505-16-40-05-02 is commonly used in turbomachinery, compressors, pumps, and electric motors. Its ability to measure shaft vibration and position helps operators detect issues like unbalance, misalignment, and bearing wear early. For example, in a steam turbine, this probe can monitor radial vibration, allowing maintenance teams to schedule repairs before catastrophic failure occurs. Moreover, its corrosion resistance for 8 mm probes ensures reliable operation even in harsh chemical environments, including contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.

Installation and Setup

Proper installation is crucial for accurate measurements. The 21505-16-40-05-02 features a 3/8-24 thread configuration and includes stainless steel lead armor for durability. When mounting, ensure the probe face is positioned correctly relative to the target surface, typically starting at about 10 mils (0.25 mm) from the probe face. The connector option includes a miniature male coaxial connector, which should be securely fastened to prevent signal loss. Always follow the manufacturer's guidelines for gap setting and cable routing to avoid interference.

Maintenance and Reliability

To maintain long-term reliability, periodic inspection of the probe and cable is recommended. Check for physical damage, such as cuts or abrasions on the lead armor, and verify that the connector remains tight. The probe is designed to withstand harsh conditions, but regular checks help ensure consistent performance. Since the system weight is only 1.3 lbs (0.59 kg), it is lightweight and easy to handle during installation or replacement. Following a routine maintenance schedule can extend the service life and reduce downtime.

Compatibility and Integration

The 21505-16-40-05-02 is part of the Bently Nevada 7200 Proximity Transducer Systems, designed to work with compatible monitors and diagnostic equipment. While specific compatibility details are not listed here, it is intended for use within Bently Nevada's monitoring ecosystem. For integration with existing systems, consult the official documentation or contact Petro Auto Tech for guidance.

Troubleshooting and Common Issues

If you encounter erratic readings, first check the cable connection and ensure the probe is not loose. Verify that the power supply is within the specified range of -17.5 Vdc to -26 Vdc. Also, confirm that the target surface is clean and within the calibrated range. If problems persist, refer to the manufacturer's manual or contact Petro Auto Tech for technical support.

Frequently Asked Questions

Q: What is the calibrated range of the 21505-16-40-05-02?

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 does the 21505-16-40-05-02 require?

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

Q: What is the frequency response of this probe?

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

Q: What is the total length of the 21505-16-40-05-02?

A: The total length is 0.5 metre (20 inches), with a tolerance of +0.13 metre / -0.05 metre.

Q: Is the 21505-16-40-05-02 resistant to corrosion?

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 21505-16-40-05-02 is available as new and original in factory packing from Petro Auto Tech. With a 12-month factory warranty, you can order with confidence. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.