21504-00-20-10-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the 21504-00-20-10-02

When machinery vibration threatens uptime, the 21504-00-20-10-02 from Bently Nevada provides accurate displacement measurement. This 8 mm probe proximity vibration transducer is part of the 7200 Proximity Transducer Systems family. It offers a calibrated range of 80 mils (2.0 mm) starting at approximately 10 mils (0.25 mm) from the probe face. Engineers rely on its consistent performance for critical rotating equipment.

Key Features and Technical Specs

• Scale Factor: 200 mV/mil (7.87 V/mm) with ±4% accuracy when calibrated as a system.
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm) with -5% at 10 kHz.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line when calibrated as a system.
• Power Input: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• Temperature Sensitivity: Typically -396% 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); Probe and Extension Cable: -30°F to +350°F (-34°C to +177°C).
• System Weight: 1.3 lbs (0.59 kg).

Real-World Applications

In turbomachinery and compressor monitoring, the 21504-00-20-10-02 excels at detecting shaft vibration and position. Its 8 mm diameter probe fits standard mounting configurations. The 1.0 metre total length with a miniature male coaxial connector simplifies installation in tight spaces. This transducer handles harsh environments with corrosion resistance to air, water, lube oil, and several chemicals.

Installation Guide

Mount the 21504-00-20-10-02 with the 3/8-24 threaded case. Ensure the probe face is positioned at the correct gap for the calibrated range. The unthreaded length option of 0 mm and overall case length of 200 mm provide flexibility. Verify the power supply delivers -17.5 Vdc to -26 Vdc at 12 mA maximum. Always follow Bently Nevada's mounting guidelines for optimal performance.

Maintenance and Reliability

Regular inspection of the probe and cable connections helps maintain accuracy. The system operates reliably in relative humidity up to 95% noncondensing. For extended service life, avoid exceeding the temperature limits: -60°F to +212°F for the Proximitor and -30°F to +350°F for the probe and cable. Periodic calibration checks ensure the scale factor remains within ±4%.

Compatibility and Integration

The 21504-00-20-10-02 integrates with Bently Nevada 7200 series monitoring systems. Its 200 mV/mil output interfaces directly with compatible vibration monitors and data acquisition modules. The miniature male coaxial connector ensures secure signal transmission. For system-level calibration, pair with Bently Nevada proximitors and extension cables.

Common Questions About the 21504-00-20-10-02

Q: What is the calibrated range of the 21504-00-20-10-02?

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 this transducer require?

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

Q: What is the frequency response of the 21504-00-20-10-02?

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

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 for the probe?

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

Product Support and Availability

The 21504-00-20-10-02 is available in new and original factory packing from Petro Auto Tech. It comes with a 12-month factory warranty. Please verify current lifecycle status and availability with Petro Auto Tech before ordering.