Bently Nevada 21504-04-12-05-02 Proximity Probe Vibration Sensor

Technical Specifications Breakdown

Key parameters for the 21504-04-12-05-02 are listed below for quick reference:

Industry Applications for the 21504-04-12-05-02

The 0 to 10 kHz frequency response covers both low-speed and high-speed machinery, enabling detection of imbalance, misalignment, and bearing wear. The corrosion-resistant tip (for 8 mm probes) allows direct contact with lube oil and common industrial chemicals, reducing the need for protective shrouds in oil-lubricated bearings. By providing early warning of developing faults, this probe helps avoid unplanned downtime and extends equipment life.

Installation & Setup Guidance

Mount the probe using the 3/8-24 threaded case into a standard mounting boss. Ensure the unthreaded length (40 mm) and overall case length (120 mm) match the installation depth requirements. The total cable length of 0.5 metre (with tolerance) must be accounted for when routing to the proximitor. Connect via the miniature male coaxial connector; verify that the connector is fully seated and locked to prevent signal loss. Power the system with -17.5 Vdc to -26 Vdc at 12 mA maximum consumption. After installation, perform a static calibration check using a target of known material to confirm the 200 mV/mil scale factor.

Maintenance & Reliability

The Bently Nevada 21504-04-12-05-02 requires minimal maintenance. Inspect the probe face and cable periodically for physical damage or contamination. The corrosion-resistant design withstands exposure to air, water, lube oil, and several chemicals, but avoid prolonged contact with abrasive particles. Verify the connector integrity during routine machine shutdowns. The system weight of 1.3 lbs. (0.59 kg) imposes negligible mechanical load on the mounting. For optimal reliability, operate within the specified temperature and humidity limits.

Reliable Vibration Monitoring with the Bently Nevada 21504-04-12-05-02

For maintenance engineers tasked with protecting critical rotating machinery, the Bently Nevada 21504-04-12-05-02 proximity probe delivers precise, continuous vibration measurement. This 8 mm diameter probe is part of the trusted 7200 Proximity Transducer System, designed for harsh industrial environments where uptime is paramount. With a calibrated range of 80 mils (2.0 mm) and a scale factor of 200 mV/mil (7.87 V/mm), it provides the accuracy needed for early fault detection.

Compatibility & Integration

This probe is designed for use with Bently Nevada 7200 series proximitors and extension cables. The 200 mV/mil output interfaces directly with standard vibration monitoring systems, PLCs, and data acquisition cards. The miniature male coaxial connector ensures consistent signal transmission. When integrating, confirm that the total system length (probe + extension cable) does not exceed the proximitor's specified limit to maintain calibration accuracy.

Selection Guide & Purchasing Advice

When selecting a replacement or spare probe, verify that the part number 21504-04-12-05-02 matches your required unthreaded length (40 mm), overall case length (120 mm), total length (0.5 metre), and connector type (miniature male coaxial). AutoDCSTech stocks this item as new and original in factory packing, backed by a 12-month warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.