21505-22-55-10-02 | Bently Nevada 80 mils Proximity Probe

Introduction to the Bently Nevada 21505-22-55-10-02

When machine vibration threatens uptime, the 21505-22-55-10-02 from Bently Nevada provides the reliable data you need. This proximity probe is part of the 7200 series, engineered for continuous vibration monitoring in critical rotating equipment. With a calibrated range of 80 mils (2.0 mm), it captures shaft displacement accurately, helping you detect issues before they escalate.

Key Features and Technical Specifications

• 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), ±4% when 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 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.
• 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).

The 21505-22-55-10-02 offers a distinctive advantage: its frequency response reaches 10 kHz, covering high-speed machinery vibrations. This makes it suitable for turbines, compressors, and pumps where early fault detection is critical.

Applications and Use Cases

In petrochemical plants, the 21505-22-55-10-02 monitors shaft vibration in pumps and compressors. Power generation facilities use it for turbine supervision, ensuring safe operation. Moreover, steel mills rely on this probe for rolling mill bearing protection. Because it operates in humid conditions up to 95%, it suits coastal and tropical environments. Consequently, this probe is a versatile choice for many industries.

Installation and Setup

Proper installation is essential for accurate readings. The probe features a 3/8-24 thread and an 8 mm diameter. It comes with a stainless steel lead armor for durability. The total length option is 1.0 metre (39 inches), with tolerance of +0.25 metre / -0.10 metre. During setup, ensure the probe face is positioned correctly relative to the target surface. Also, verify the gap within the calibrated range. For detailed mounting instructions, consult the Bently Nevada manual.

Maintenance and Reliability

Regular inspection of the probe and cable helps maintain performance. Check for physical damage, especially on the lead armor. Since the probe is corrosion-resistant to air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF, it withstands harsh industrial environments. Still, periodic verification of the scale factor is recommended. This ensures long-term accuracy and reduces downtime.

Compatibility and Integration

The 21505-22-55-10-02 is designed to work with Bently Nevada 7200 series monitoring systems. It provides a standard 200 mV/mil output, which integrates easily with existing vibration monitoring equipment. However, always confirm compatibility with your specific system before ordering.

Common Questions About the 21505-22-55-10-02

Q: What is the calibrated range of the 21505-22-55-10-02?

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 this probe require?

A: It requires -17.5 Vdc to -26 Vdc, with a maximum consumption of 12 mA.

Q: Can the probe operate in high humidity?

A: Yes, it can operate in relative humidity up to 95%, noncondensing.

Q: What is the frequency response of this model?

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

Q: Is the probe 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 21505-22-55-10-02 is available through Petro Auto Tech. We offer new and original factory-packed units with a 12-month warranty. Contact us for current lifecycle status and availability before ordering.