21505-00-28-05-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the Bently Nevada 21505-00-28-05-02

When rotating machinery health is critical, the 21505-00-28-05-02 from Bently Nevada provides precise vibration measurement. This 8 mm proximity probe is part of the 7200 Proximity Transducer Systems family. It is designed to monitor shaft vibration and position in industrial environments.

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 accurate data for predictive maintenance. Its robust construction includes stainless steel lead armor, ensuring durability in harsh conditions.

Choosing the right vibration sensor directly impacts uptime and maintenance costs. The 21505-00-28-05-02 helps you detect issues early, reducing unplanned downtime and extending equipment life.

Key Features and Technical Specifications

• Part Number: 21505-00-28-05-02
• Model: Probe Proximity Vibration
• Manufacturer: Bently Nevada
• Total Length: 0.5 metre (20 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% (system calibrated), ±9.5% including interchangeability errors
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line (system calibrated); 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)

The 21505-00-28-05-02 offers a distinctive combination of accuracy and environmental resilience. Its frequency response up to 10 kHz covers most rotating machinery vibrations, making it a versatile choice.

Cost-Benefit Analysis of the 21505-00-28-05-02

Investing in reliable vibration monitoring reduces maintenance costs. The 21505-00-28-05-02 provides accurate data, enabling condition-based maintenance instead of costly scheduled overhauls.

Its wide operating temperature range allows deployment in demanding environments, minimizing the need for additional protection. The stainless steel armor extends service life, lowering replacement frequency.

By detecting faults early, this probe helps avoid catastrophic failures that lead to expensive downtime. Over time, the savings from reduced unplanned outages outweigh the initial investment.

Installation and Setup Guide

Proper installation is essential for accurate readings. Mount the 21505-00-28-05-02 with the recommended gap of approximately 10 mils (0.25 mm) from the probe face to the target surface.

Ensure the probe is securely fastened and the cable is routed away from high-interference areas. Follow Bently Nevada's guidelines for cable length and connector handling.

After installation, verify the system calibration to achieve the specified scale factor. Regular checks help maintain measurement integrity.

Maintenance and Reliability Tips

Routine inspection of the probe and cable is recommended. Check for physical damage, especially on the lead armor, and ensure connectors remain clean and tight.

Because the probe can operate in humid conditions up to 95% noncondensing, it is suitable for many industrial settings. However, avoid exposing it to corrosive chemicals not listed in the specifications.

Periodically verify the output signal against a known reference to confirm accuracy. This practice helps sustain reliable performance and reduces long-term costs.

Compatibility and Integration

The 21505-00-28-05-02 is designed for use with Bently Nevada 7200 Proximitor systems. It integrates seamlessly with compatible monitors and diagnostic equipment.

For system-level calibration, pair this probe with the appropriate Proximitor and extension cable to achieve the specified scale factor and linearity.

Consult the official Bently Nevada documentation for detailed integration guidance.

Common Questions About the 21505-00-28-05-02

Q: What is the calibrated range of the 21505-00-28-05-02?

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 21505-00-28-05-02 require?

A: It operates on -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 operating temperature range for the probe and cable?

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

Product Support and Availability

The Bently Nevada 21505-00-28-05-02 is available from Petro Auto Tech. As an industrial automation parts supplier, Petro Auto Tech offers genuine products with factory warranty.

For current lifecycle status and availability, please contact Petro Auto Tech directly.