21505-00-40-10-02 | Bently Nevada 8 mm Proximity Probe

Why Choose the Bently Nevada 21505-00-40-10-02 Proximity Probe?

When rotating machinery fails unexpectedly, downtime costs can escalate quickly. The 21505-00-40-10-02 from Bently Nevada helps you detect vibration issues early, preventing costly failures. This 8 mm proximity probe is part of the 7200 series, engineered for reliable shaft vibration and position monitoring.

With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil (7.87 V/mm), this probe delivers precise measurements. It begins sensing at approximately 10 mils (0.25 mm) from the probe face, offering excellent sensitivity for critical machinery.

Key Features and Technical Specifications

• Part Number: 21505-00-40-10-02
• Model: Probe Proximity Vibration
• Manufacturer: Bently Nevada
• Total Length: 1.0 metre (39 inches), tolerance +0.25 m / -0.10 m
• Power: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption
• Calibrated Range: 80 mils (2.0 mm), begins at ~10 mils (0.25 mm)
• Scale Factor: 200 mV/mil (7.87 V/mm), ±4% (system calibrated)
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line (system calibrated)
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm)
• Temperature Sensitivity: Typically -3% change in scale factor at +150°F (+65°C) at 50 mils gap
• Operating Temperature (Proximitor): -60°F to +212°F (-51°C to +100°C)
• Operating Temperature (Probe & 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)

The probe features a standard case with 3/8-24 threads and stainless steel lead armor for durability. It includes a miniature male coaxial connector (option 02) for secure signal transmission.

Applications and Use Cases

The 21505-00-40-10-02 is ideal for monitoring vibration in turbines, compressors, pumps, and other rotating equipment. Its frequency response up to 10 kHz covers typical machine vibration frequencies. 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. Whether you're protecting critical assets or performing condition monitoring, this probe provides reliable data.

Installation and Setup

Proper installation is crucial for accurate readings. Mount the probe with the 3/8-24 threads, ensuring the probe face is positioned within the calibrated gap. Use the provided connector for signal output. Follow Bently Nevada's guidelines for gap setting and cable routing to avoid interference. Always verify the power supply meets the -17.5 Vdc to -26 Vdc requirement.

Maintenance and Reliability

Regular inspection of the probe and cable helps maintain performance. Check for physical damage and ensure the connector remains tight. The stainless steel armor protects against wear, but periodic visual checks are recommended. Operating within the specified temperature and humidity limits ensures long-term reliability.

Compatibility and Integration

The 21505-00-40-10-02 is designed for use with Bently Nevada 7200 series monitoring systems. It provides a standard 200 mV/mil output, compatible with most vibration monitors and data collectors. For system integration, consult the official documentation or contact Petro Auto Tech for assistance.

Troubleshooting Common Issues

If readings appear erratic, first check the power supply voltage and connector integrity. Ensure the probe gap is within the calibrated range. If the scale factor deviates, recalibrate the system. For persistent issues, refer to the manufacturer's manual or contact Petro Auto Tech.

FAQ about the 21505-00-40-10-02

Q: What is the calibrated range of the 21505-00-40-10-02?

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

Q: What power supply does the probe 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).

Q: What is the scale factor?

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

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).

Product Support and Availability

The 21505-00-40-10-02 is available from Petro Auto Tech. We ensure new and original factory packing with a 12-month warranty. Contact us for current availability and lifecycle status.