21504-00-24-10-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the 21504-00-24-10-02

When unplanned downtime threatens your rotating machinery, the 21504-00-24-10-02 from Bently Nevada provides critical vibration data. This 8 mm probe proximity transducer system measures shaft displacement with a calibrated range of 80 mils (2.0 mm). It begins sensing at approximately 10 mils (0.25 mm) from the probe face, enabling early detection of developing faults.

Part of the 7200 Proximity Transducer Systems family, the 21504-00-24-10-02 is engineered for continuous operation in harsh industrial environments. Its robust design includes a standard 318-24 thread configuration and no lead armor, simplifying installation in tight spaces.

Key Features and Technical Specifications

The 21504-00-24-10-02 offers a scale factor of 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. Even including interchangeability errors, linearity stays within 2.3 mils (0.06 mm).

• Input Power: -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 (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).
• Probe and Extension Cable Temperature: -30°F to +350°F (-34°C to +177°C).
• Relative Humidity: Up to 95%, noncondensing.
• System Weight: 1.3 lbs (0.59 kg).

A distinctive feature is the probe's corrosion resistance for 8 mm probes. Direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF does not affect operation. This makes the 21504-00-24-10-02 suitable for aggressive chemical environments.

Applications and Use Cases

Engineers rely on the 21504-00-24-10-02 for monitoring critical rotating assets such as turbines, compressors, and pumps. Its 80 mil calibrated range captures both normal vibration and sudden excursions. The 1.0 metre (39 inches) total length with a miniature male coaxial connector simplifies integration into existing monitoring systems. For example, in a petrochemical plant, the probe's corrosion resistance ensures reliable readings despite exposure to sulfuric acid vapors.

Installation and Setup

Mount the 21504-00-24-10-02 probe using the standard 318-24 thread into a pre-drilled hole. Ensure the unthreaded length option 00 (0 mm) aligns with the mounting surface. Connect the miniature male coaxial connector to the extension cable, maintaining a gap of approximately 10 mils (0.25 mm) from the target surface. Verify the power supply delivers -17.5 Vdc to -26 Vdc at 12 mA maximum. After installation, perform a system calibration to confirm the 200 mV/mil scale factor within ±4%.

Maintenance and Reliability

Regularly inspect the probe face and cable for physical damage or contamination. Because the 21504-00-24-10-02 operates in temperatures from -30°F to +350°F for the probe, check for thermal stress on the cable jacket. The noncondensing humidity limit of 95% means you should avoid direct steam exposure. Periodically verify the output voltage against a known gap to detect drift. Following these steps extends service life and reduces unplanned downtime.

Frequently Asked Questions

Q: What is the calibrated range of the 21504-00-24-10-02?

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 the 21504-00-24-10-02 require?

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

Q: What is the scale factor of the 21504-00-24-10-02?

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

Q: Can the 21504-00-24-10-02 withstand corrosive environments?

A: Yes, for 8 mm probes, operation is not affected by direct contact with air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF.

Q: What is the frequency response of the 21504-00-24-10-02?

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

Product Support and Availability

The 21504-00-24-10-02 is available as new and original in factory packing from Petro Auto Tech. Each unit comes with a 12-month factory warranty. Contact Petro Auto Tech to verify lifecycle status and current stock before ordering.