21504-004-016-10-02 | Bently Nevada 8 mm Probe Proximity Vibration

What Makes the 21504-004-016-10-02 Essential for Vibration Monitoring?

When rotating machinery demands precise vibration measurement, the 21504-004-016-10-02 from Bently Nevada provides reliable proximity sensing. This 8 mm probe is part of the 7200 Proximity Transducer Systems family, engineered for continuous operation in harsh 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 accurate data for predictive maintenance.

Core Specifications of the 21504-004-016-10-02

• 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 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 if 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: To 95%, noncondensing.
• System Weight: 1.3 lbs (0.59 kg).

A standout feature is the 200 mV/mil scale factor, which provides high sensitivity for detecting minute shaft displacements. This enables early identification of bearing wear or imbalance, reducing unplanned downtime.

Real-World Applications for the 21504-004-016-10-02

In industrial settings, the 21504-004-016-10-02 excels at monitoring critical rotating equipment such as turbines, compressors, and pumps. For example, in a petrochemical plant, it can detect shaft vibration changes that signal impending failure. Its corrosion resistance to air, water, lube oil, and chemicals like sulfuric acid (10%) makes it suitable for harsh environments. Additionally, the wide operating temperature range ensures reliable performance in extreme conditions.

Installation and Setup Guidance

Mount the 8 mm probe with 3/8-24 threads securely to the machine casing. Ensure the unthreaded length option of 40 mm (004) and overall case length of 1.6 in (016) match your clearance requirements. The total length of 1.0 metre (39 inches) with tolerance of +0.25 m, -0.10 m provides flexibility. Connect via the miniature male coaxial connector (option 02). Use shielded cable to minimize electrical noise, and verify the power supply delivers -17.5 Vdc to -26 Vdc at 12 mA maximum.

Maintenance and Reliability Tips

To maximize service life, inspect the probe and cable periodically for physical damage or contamination. The system operates reliably in up to 95% noncondensing humidity. Regular calibration checks help maintain the ±4% scale factor accuracy. For long-term reliability, follow Bently Nevada's recommended inspection intervals based on operating conditions.

Frequently Asked Questions about the 21504-004-016-10-02

Q: What is the calibrated range of the 21504-004-016-10-02?

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 21504-004-016-10-02 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), with -5% at 10 kHz (600,000 cpm).

Q: What is the operating temperature range for the probe and extension cable?

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

Q: What is the total length of the 21504-004-016-10-02 cable?

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

Product Support and Availability

The 21504-004-016-10-02 is available as new and original in factory packing from Petro Auto Tech. Please verify current lifecycle status and availability with Petro Auto Tech before ordering to ensure timely delivery for your project.