21505-00-12-10-02 | Bently Nevada 80 mils Proximity Probe

Introduction to the 21505-00-12-10-02

When machine vibration threatens uptime, the 21505-00-12-10-02 from Bently Nevada provides the precise measurement you need. This proximity probe is part of the 7200 series, engineered for reliable shaft vibration and position monitoring in rotating machinery.

With a calibrated range of 80 mils (2.0 mm), this probe captures critical displacement data that helps prevent unplanned downtime. The 21505-00-12-10-02 is supplied new and in original factory packaging, backed by a 12-month warranty.

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) with ±4% accuracy when calibrated as a system.
• Power Input: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm) with -5% at 10 kHz.
• Total Length: 1.0 metre (39 inches) with tolerance +0.25 m / -0.10 m.
• Probe Diameter: 8 mm with 3/8-24 threads.
• Lead Armor: Stainless steel for enhanced durability.

One standout feature is the temperature sensitivity: typically -3% change in scale factor at +150°F (+65°C) at 50 mils gap (1.27 mm). This ensures stable readings even in demanding thermal environments.

Real-World Applications

This proximity probe is ideal for monitoring shaft vibration in turbines, compressors, pumps, and other rotating equipment. Its 80 mils range covers most machinery protection needs, while the 200 mV/mil output integrates seamlessly with Bently Nevada monitoring systems.

For example, in a steam turbine train, the 21505-00-12-10-02 can detect shaft displacement changes that indicate bearing wear or misalignment. By catching these issues early, you avoid costly catastrophic failures.

Installation and Setup

Proper installation is critical for accurate readings. The probe features a standard case with 3/8-24 threads, allowing secure mounting. The unthreaded length is 0 mm, and the overall case length is 120 mm.

When installing, ensure the probe face is positioned correctly relative to the shaft. The calibrated range begins at approximately 10 mils (0.25 mm) from the probe face, so set the initial gap accordingly. Use the connector option with miniature male coaxial connector for reliable signal transmission.

Always follow Bently Nevada's installation guidelines to achieve the stated scale factor accuracy.

Maintenance and Reliability

Routine inspection of the probe and its cable is recommended to ensure long-term performance. The stainless steel lead armor protects against mechanical damage, and the probe resists corrosion from air, water, lube oil, and several chemicals.

Operating temperature ranges from -60°F to +212°F for the Proximitor and -30°F to +350°F for the probe and extension cable. Relative humidity up to 95% (noncondensing) is supported, making this probe suitable for harsh industrial environments.

By following a simple maintenance schedule, you extend the service life of the 21505-00-12-10-02 and maintain measurement accuracy.

Compatibility and Integration

The 21505-00-12-10-02 is designed for use with Bently Nevada 7200 proximity transducer systems. It connects to a Proximitor (sold separately) that conditions the signal for monitoring systems.

For integration, verify that your monitoring system accepts the 200 mV/mil output. The probe's frequency response of 0 to 10 kHz covers typical machine vibration frequencies, ensuring compatibility with most protection systems.

Common Questions About the 21505-00-12-10-02

Q: What is the calibrated range of the 21505-00-12-10-02?

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 at 12 mA maximum consumption.

Q: What is the scale factor accuracy?

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?

A: The Proximitor operates from -60°F to +212°F, while the probe and extension cable handle -30°F to +350°F.

Q: Is the lead armor stainless steel?

A: Yes, the lead armor is made of stainless steel for durability.

Availability and Support

The 21505-00-12-10-02 is available from Petro Auto Tech, an industrial automation parts supplier. Contact Petro Auto Tech to confirm current stock and lead times. Please verify lifecycle status before ordering.