21500-00-24-05-02 | Bently Nevada 5 mm Probe Proximity Vibration

Introduction to the Bently Nevada 21500-00-24-05-02

When critical rotating machinery demands precise vibration monitoring, the 21500-00-24-05-02 from Bently Nevada provides a reliable solution. This probe proximity vibration sensor is part of the 7200 Proximity Transducer Systems family. It offers a 5 mm diameter tip with a standard case configuration and 1/4-28 threads. Engineers choose this model for its accurate gap measurement and robust environmental performance.

Key Features and Technical Specifications

The 21500-00-24-05-02 delivers a calibrated range of 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face. Its scale factor is 200 mV/mil (7.87 V/mm) with ±4% accuracy when calibrated as a system. Linearity remains within 0.8 mils (0.02 mm) of a 200 mV/mil straight line under system calibration. Frequency response spans 0 to 10 kHz (0 to 600,000 cpm) with -5% at 10 kHz. Input power requires -17.5 Vdc to -26 Vdc at 12 mA maximum consumption. The system weight is 1.3 lbs (0.59 kg).

• Probe Diameter: 5 mm tip
• Thread Size: 1/4-28
• Calibrated Range: 80 mils (2.0 mm)
• Scale Factor: 200 mV/mil (7.87 V/mm)
• Frequency Response: 0 to 10 kHz
• Input Power: -17.5 Vdc to -26 Vdc at 12 mA

One distinctive spec 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 performance across varying thermal conditions.

Applications and Use Cases

The 21500-00-24-05-02 excels in monitoring shaft vibration and position in turbines, compressors, and pumps. For example, in a steam turbine application, the sensor provides continuous gap measurement to prevent rotor-to-stator contact. Its 0 to 10 kHz frequency response captures both low-speed and high-speed vibration events. Additionally, the probe operates reliably in humid environments up to 95% relative humidity, noncondensing.

Installation and Setup

Install the 21500-00-24-05-02 with the unthreaded length option of 0 mm and overall case length of 2.4 inches. The total length is 0.5 meter (20 inches) with tolerance of +0.13 meter, -0.05 meter (+5 inches, -2 inches). Use the miniature male coaxial connector for signal output. Ensure the probe face is positioned approximately 10 mils from the target surface to begin the calibrated range. Follow standard proximity probe mounting practices for optimal results.

Maintenance and Reliability

Regular inspection of the 21500-00-24-05-02 ensures long-term reliability. Check the probe tip and cable for physical damage. The system operates within -30°F to +350°F (-34°C to +177°C) for the probe and extension cable, and -60°F to +212°F (-51°C to +100°C) for the proximitor. For 8 mm probes only, the probe resists direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF. Schedule periodic verification of scale factor and linearity per manufacturer guidelines.

Compatibility and Integration

The 21500-00-24-05-02 integrates with Bently Nevada 7200 Proximitor systems. It uses a standard 1/4-28 thread for mounting and a miniature male coaxial connector for signal transmission. The sensor output is 200 mV/mil, compatible with most vibration monitoring systems. For system calibration, pair it with the matching proximitor to achieve ±4% scale factor accuracy.

Troubleshooting and Common Issues

If the 21500-00-24-05-02 shows erratic readings, first verify the input power is within -17.5 Vdc to -26 Vdc at 12 mA. Check the connector for corrosion or damage. Ensure the probe gap is within the calibrated range of 10 to 80 mils. If scale factor deviates beyond ±4%, recalibrate the system. For linearity errors exceeding 0.8 mils, inspect the target surface for runout or damage.

FAQ about the 21500-00-24-05-02

What is the calibrated range of the 21500-00-24-05-02?

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

What is the scale factor of this probe?

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

What is the operating temperature range for the probe?

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

What connector does the 21500-00-24-05-02 use?

It uses a miniature male coaxial connector (connector option 02).

What is the input power requirement?

Input power is -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.

Product Support and Availability

The 21500-00-24-05-02 is available as new and original in 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.