21504-16-32-10-02 | Bently Nevada 1m Cable Proximity Probe

Introduction to the Bently Nevada 21504-16-32-10-02

When unplanned machine downtime threatens production targets, the 21504-16-32-10-02 from Bently Nevada provides the reliable vibration data you need. This proximity probe is engineered for continuous monitoring of rotating equipment, helping maintenance teams detect issues before they escalate. As part of the 7200 Proximity Transducer Systems, this model offers a calibrated range of 80 mils (2.0 mm), starting at approximately 10 mils (0.25 mm) from the probe face. With a scale factor of 200 mV/mil (7.87 V/mm), it delivers accurate, repeatable measurements for critical machinery.

Key Features and Technical Specifications

• Part Number: 21504-16-32-10-02
• Model: Probe Proximity Vibration
• Manufacturer: Bently Nevada
• Total Length: 1.0 metre (39 inches), tolerance +0.25/-0.10 metre
• Power Supply: -17.5 Vdc to -26 Vdc at 12 mA maximum consumption
• Calibrated Range: 80 mils (2.0 mm), begins at approximately 10 mils (0.25 mm) from probe face
• Scale Factor: 200 mV/mil (7.87 V/mm), ±4% if calibrated as a system
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line (system calibrated)
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm)
• 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)

The distinctive 80 mil calibrated range sets this probe apart, allowing measurement over a wider gap than many standard sensors. This is especially useful in applications where shaft vibration or axial position must be tracked with high precision. Moreover, the frequency response up to 10 kHz covers most rotating machinery speeds, ensuring you capture both slow and fast dynamic events.

Applications and Use Cases

In industrial plants, the 21504-16-32-10-02 is commonly deployed on turbines, compressors, pumps, and electric motors. For example, a maintenance engineer might install this probe to monitor bearing vibration on a critical cooling water pump. Because the probe is corrosion-resistant to air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF (for 8 mm probes only), it suits harsh environments. Furthermore, the wide operating temperature range ensures reliable performance in both cold outdoor installations and hot machinery compartments.

Installation and Setup

Proper installation is key to accurate readings. Begin by verifying the total length of 1.0 metre (39 inches) fits your mounting location. The unthreaded length is 16 mm, and the overall case length is 3.2 inches, so check clearance before mounting. Use the 3/8-24 threads to secure the probe, ensuring the face is positioned correctly relative to the target surface. The connector option includes a miniature male coaxial connector, which simplifies wiring to the Proximitor. Always follow the manufacturer's guidelines for gap setting and cable routing to avoid signal interference.

Maintenance and Reliability

Routine inspection of the probe and cable is essential for long-term reliability. Check for physical damage, loose connections, or contamination on the probe face. Because the system is sensitive to temperature changes, be aware that scale factor can shift by typically -3% at +150°F (+65°C) at a 50 mils gap (1.27 mm). Regular calibration checks, as recommended by Bently Nevada, will help maintain measurement accuracy. By incorporating this probe into your predictive maintenance program, you can reduce unexpected failures and extend machinery life, ultimately lowering overall maintenance costs.

Compatibility and Integration

The 21504-16-32-10-02 is designed to work with Bently Nevada 7200 series monitoring systems. It connects to a Proximitor, which conditions the signal for further processing. While specific communication protocols are not listed, the analog output can be integrated into most PLC or DCS systems using standard 4-20 mA or voltage inputs. For detailed integration guidance, consult the official Bently Nevada documentation or contact Petro Auto Tech.

Troubleshooting and Common Issues

If readings appear erratic, first check the power supply: the unit requires -17.5 Vdc to -26 Vdc at 12 mA maximum. Verify that the probe face is clean and the gap is within the calibrated range. A common issue is incorrect gap setting, which can cause the output to saturate. Also, ensure the cable is not damaged and the connector is secure. If problems persist, refer to the manufacturer's manual or reach out to Petro Auto Tech for technical support.

FAQs

Q: What is the calibrated range of the 21504-16-32-10-02?

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 probe require?

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

Q: What is the frequency response of this probe?

A: The frequency response is 0 to 10 kHz (0 to 600,000 cpm).

Q: What are the operating temperature limits?

A: The Proximitor operates from -60°F to +212°F (-51°C to +100°C), while the probe and extension cable handle -30°F to +350°F (-34°C to +177°C).

Product Support and Availability

At Petro Auto Tech, we stock the 21504-16-32-10-02 as a new and original factory-packed unit. It comes with a 12-month factory warranty. For ordering or technical questions, contact our team today. We are ready to help you keep your machinery running smoothly.