21504-00-12-10-02 | Bently Nevada 8 mm Probe Proximity Vibration

Introduction to the Bently Nevada 21504-00-12-10-02

When reliable vibration monitoring is critical for rotating machinery, the 21504-00-12-10-02 from Bently Nevada provides accurate proximity measurements. This 8 mm probe is part of the 7200 Proximity Transducer Systems family, engineered for industrial environments. With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil (7.87 V/mm), it delivers consistent performance for predictive maintenance. The probe operates with a power input of -17.5 Vdc to -26 Vdc at 12 mA maximum consumption, ensuring stable readings.

Key Features & Technical Specs of the 21504-00-12-10-02

• Calibrated Range: 80 mils (2.0 mm) begins 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.
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line if calibrated as a system.
• 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).
• System Weight: 1.3 lbs (0.59 kg).

One distinctive spec is the frequency response from 0 to 10 kHz, covering up to 600,000 cpm. This range allows the probe to detect both slow-speed and high-speed machinery vibrations, making it versatile for various rotating equipment.

Applications & Use Cases

Engineers often deploy the 21504-00-12-10-02 in turbines, compressors, and pumps where shaft vibration monitoring is essential. For example, in steam turbine applications, this probe helps detect early signs of imbalance or misalignment. Additionally, its corrosion resistance to air, water, lube oil, and certain chemicals makes it suitable for harsh industrial environments. Consequently, it supports condition-based maintenance strategies that reduce unplanned downtime.

Installation & Setup Guide

Mount the probe with a 3/8-24 thread configuration into a suitable mounting hole. Ensure the probe face is positioned at the recommended gap of approximately 10 mils (0.25 mm) from the target surface. Use the provided miniature male coaxial connector for signal output. For optimal performance, verify that the total cable length of 1.0 metre (39 inches) meets your installation requirements. Always follow the manufacturer's manual for precise wiring and calibration procedures.

Maintenance & Reliability Tips

Regular inspection of the probe and cable is recommended to ensure consistent readings. Check for physical damage or contamination on the probe face. The system operates reliably within -30°F to +350°F for the probe and extension cable. For long-term reliability, keep the connector clean and dry. If any deviation in output is observed, verify the gap and recalibrate per the system specifications.

Compatibility & Integration

The 21504-00-12-10-02 integrates with Bently Nevada 7200 series monitoring systems. It outputs a proportional DC voltage signal that interfaces with standard vibration monitoring modules. For system calibration, use the specified scale factor of 200 mV/mil to match your data acquisition setup. Refer to the official Bently Nevada documentation for detailed integration guidelines.

FAQ about the 21504-00-12-10-02

What is the calibrated range of the 21504-00-12-10-02?

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 proximity probe?

The scale factor is 200 mV/mil (7.87 V/mm), with a tolerance of ±4% 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 type of connector does the 21504-00-12-10-02 use?

It uses a miniature male coaxial connector for signal output.

What is the frequency response of this probe?

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

Product Support & Availability

The Bently Nevada 21504-00-12-10-02 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.