21504-00-36-10-02 | Bently Nevada 8 mm Probe Proximity Vibration Transducer

Introduction: Solving Vibration Monitoring Challenges with the 21504-00-36-10-02

When rotating machinery experiences unexpected vibration, engineers need accurate, real-time data to diagnose problems before they escalate. The 21504-00-36-10-02 Bently Nevada probe proximity vibration transducer addresses this challenge by providing a calibrated range of 80 mils (2.0 mm) with a scale factor of 200 mV/mil (7.87 V/mm). This precision allows maintenance teams to detect early signs of bearing wear, imbalance, or misalignment.

Part of the 7200 Proximity Transducer Systems family, this 8 mm diameter probe features a standard case and 3/8-24 threads for secure mounting. Its unthreaded length option is 0 mm, overall case length is 3.6 inches, and total length is 1.0 meter (39 inches) with a tolerance of +0.25 meter, -0.10 meter. The connector option includes a miniature male coaxial connector for reliable signal transmission.

Key Features and Technical Specifications of the 21504-00-36-10-02

• Power Input: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption.
• 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; within ±9.5% including interchangeability errors.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line when 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).
• 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).

One distinctive feature is the corrosion resistance for 8 mm probes: the probe operation remains unaffected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK (methyl-ethyl ketone), or DMF (dimethylformamide). This makes the 21504-00-36-10-02 suitable for harsh industrial environments.

Real-World Applications for the Bently Nevada 21504-00-36-10-02

In petrochemical plants, the 21504-00-36-10-02 monitors compressor vibration to prevent unplanned shutdowns. Power generation facilities use it to track turbine shaft movement and ensure stable operation. Its wide frequency response from 0 to 10 kHz captures both low-speed and high-speed vibrations, making it versatile for pumps, fans, and motors. The corrosion-resistant probe withstands exposure to chemicals like sulfuric acid and lube oil, which is critical in refining applications.

Installation and Setup Guide

Mount the probe using the 3/8-24 threaded configuration into a suitable bracket or housing. Ensure the probe face is positioned approximately 0.25 mm from the target surface to achieve the start of the calibrated range. Connect the miniature male coaxial connector to the extension cable or proximitor, and verify the power supply is within -17.5 Vdc to -26 Vdc. The system weight of 1.3 lbs (0.59 kg) allows for easy handling during installation. Always follow the manufacturer's manual for precise gap setting and wiring.

Maintenance and Reliability Tips

Regularly inspect the probe and cable for physical damage or contamination. The probe's corrosion resistance reduces maintenance frequency in aggressive environments. Check the power supply voltage periodically to ensure it stays within the specified range. For optimal reliability, verify the scale factor and linearity during scheduled system calibrations. These practices help extend service life and maintain measurement accuracy.

Compatibility and Integration

The 21504-00-36-10-02 integrates with Bently Nevada 7200 Proximitor systems and compatible monitoring platforms. Its 200 mV/mil output interfaces directly with vibration analyzers, data collectors, and distributed control systems. The 1.0 meter total length with coaxial connector simplifies connection to extension cables. For system-level integration, refer to the official Bently Nevada documentation.

Troubleshooting Common Issues

If the output signal is erratic, check the power supply for noise or voltage drops outside the -17.5 Vdc to -26 Vdc range. A missing or weak signal may indicate a damaged coaxial connector or cable break. Verify the probe gap is within the calibrated range—if the gap exceeds 80 mils, the output will be non-linear. Temperature extremes beyond -30°F to +350°F for the probe can cause drift; ensure the environment stays within limits.

Frequently Asked Questions about the 21504-00-36-10-02

Q: What is the scale factor of the 21504-00-36-10-02?

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).

Q: What chemicals can the probe resist?

A: The 8 mm probe resists air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF.

Q: What is the power requirement for this transducer?

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

Q: What is the total cable length of the 21504-00-36-10-02?

A: The total length is 1.0 meter (39 inches), with a tolerance of +0.25 meter, -0.10 meter.

Product Support and Availability

The 21504-00-36-10-02 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.