21505-04-48-10-02 | Bently Nevada 80 mils Proximity Probe

Introduction to the Bently Nevada 21505-04-48-10-02 Proximity Probe

When rotating machinery reliability is critical, the 21505-04-48-10-02 from Bently Nevada provides the precise vibration data you need. This proximity probe is part of the 7200 series, engineered for continuous monitoring of shaft vibration and position. With its robust construction and factory calibration, it is ready for demanding industrial environments.

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.
• 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), -5% at 10 kHz.
• Power Requirement: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• 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 8 mm diameter probe with stainless steel armor is built for durability. The total length option of 1.0 metre (39 inches) with a tolerance of +.25 metre/-.10 metre ensures flexible installation. The miniature male coaxial connector provides a secure connection.

Applications and Use Cases

The 21505-04-48-10-02 is ideal for monitoring shaft vibration in turbines, compressors, pumps, and motors. In addition, it is suitable for measuring axial position and eccentricity. Consequently, it helps prevent costly downtime by detecting issues early. Furthermore, its corrosion resistance to air, water, lube oil, and certain chemicals makes it versatile for harsh environments.

Installation and Setup

Proper installation is key to accurate readings. First, mount the probe with the recommended gap (approximately 10 mils from the target). Then, connect the coaxial cable to the Proximitor. After that, verify the system calibration using the scale factor. Finally, check the frequency response to ensure it meets your monitoring needs.

Maintenance and Reliability

Regular inspection of the probe and cable is recommended. Check for physical damage and ensure the connector remains tight. Additionally, monitor the temperature to stay within the specified limits. As a result, you can maintain measurement accuracy and extend the service life of the sensor.

Compatibility and Integration

This probe is designed for use with Bently Nevada 7200 series monitoring systems. It provides a standard 200 mV/mil output, which is compatible with most vibration monitors and data collectors. Therefore, integrating it into existing systems is straightforward.

Troubleshooting Common Issues

If readings appear erratic, first check the gap voltage. Then, inspect the cable for breaks or shorts. Also, verify that the target surface is clean and within the specified range. If problems persist, consult the official Bently Nevada documentation or contact Petro Auto Tech for assistance.

FAQ about the 21505-04-48-10-02

Q: What is the calibrated range of the 21505-04-48-10-02?

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

Q: What is the scale factor of this probe?

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

Q: What power supply is required?

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

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).

Q: Is the probe resistant to chemicals?

A: Yes, for 8 mm probes, operation is unaffected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.

Product Support and Availability

The 21505-04-48-10-02 is available from Petro Auto Tech. It is new and in original factory packing. Contact Petro Auto Tech for current availability and ordering information.