21505-00-40-05-02 | Bently Nevada 80 mils Range Proximity Probe

Introduction to the Bently Nevada 21505-00-40-05-02

When machine vibration threatens uptime, the 21505-00-40-05-02 from Bently Nevada provides the precise measurement you need. This proximity probe is engineered for continuous monitoring of rotating machinery, delivering reliable data to protect your assets.

Part of the 7200 Proximity Transducer Systems, this model features an 8 mm diameter probe with a standard case and 3/8-24 threads. The unthreaded length is 0.0 inches, overall case length is 4.0 inches, and total length is 0.5 metre (20 inches). The connector option includes a miniature male coaxial connector, and the lead armor is stainless steel.

Key Features and Technical Specifications

The 21505-00-40-05-02 offers a calibrated range of 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face. This wide range allows for accurate measurement across various operating gaps.

• Scale Factor: 200 mV/mil (7.87 V/mm), ±4% (measured in increments of 10 mils over the calibrated range) if calibrated as a system.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line if calibrated 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 (600,000 cpm).
• Power Requirement: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• 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).

These specifications ensure reliable performance in demanding industrial environments. The corrosion resistance for 8 mm probes means operation is not affected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.

Applications and Use Cases

This proximity probe is ideal for vibration monitoring on turbines, compressors, pumps, and other rotating equipment. For example, in a petrochemical plant, the probe can detect shaft vibration and thrust position, helping to prevent catastrophic failures.

Additionally, the probe's wide frequency response makes it suitable for both low-speed and high-speed machinery. Consequently, maintenance teams can use the data to schedule repairs proactively, reducing unplanned downtime.

Installation and Setup

Proper installation is crucial for accurate readings. First, ensure the probe is mounted with the correct gap according to the calibrated range. The 3/8-24 threads allow for secure mounting, and the stainless steel lead armor protects the cable from damage.

Next, connect the miniature male coaxial connector to the extension cable and proximitor. Finally, verify the system calibration using the scale factor and linearity specifications to ensure optimal performance.

Maintenance and Reliability

Regular inspection of the probe and cable is recommended to maintain accuracy. Check for any physical damage or corrosion, especially in harsh environments. The probe's corrosion resistance helps extend its service life, reducing replacement costs.

Furthermore, periodic verification of the system's calibration ensures consistent measurements. By following these practices, you can maximize the reliability of your vibration monitoring system.

Compatibility and Integration

The 21505-00-40-05-02 is designed to work with Bently Nevada 7200 series monitoring systems. It can be integrated with existing vibration monitoring networks, providing seamless data acquisition.

For detailed integration guidance, refer to the official Bently Nevada documentation or contact Petro Auto Tech for technical support.

Frequently Asked Questions

Q: What is the calibrated range of the 21505-00-40-05-02?

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 is required for this proximity probe?

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

Q: What is the frequency response of the 21505-00-40-05-02?

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

Q: Can this probe be used in high-humidity environments?

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

Q: What is the operating temperature range for the probe and extension cable?

A: The operating temperature range is -30°F to +350°F (-34°C to +177°C).

Product Support and Availability

The 21505-00-40-05-02 is available from Petro Auto Tech, an industrial automation parts supplier. It comes in new and original factory packing with a 12-month warranty. Contact Petro Auto Tech for current availability and ordering information.