Optimize Rotating Machinery Protection with the Bently Nevada 21504-00-56-05-02
When protecting critical rotating assets like steam turbines, compressors, and pumps, precise vibration measurement is non-negotiable. The Bently Nevada 21504-00-56-05-02 is a proximity probe system engineered for continuous, reliable shaft vibration and position monitoring. This 8mm probe, part of the 7200 series, delivers the accuracy and durability required in harsh industrial environments.
Technical Specifications Breakdown
Key parameters for the 21504-00-56-05-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Model | 21504 7200 Proximity Transducer Systems |
| Diameter | 8 mm |
| Threads | 3/8-24 |
| Unthreaded Length Option | 00 (0mm) |
| Overall Case Length Option | 56 (5.6in) |
| Total Length Option | 05 (0.5 metre / 20 inches). Tolerance: +.13 metre, -.05 metre (+5 inches, -2 inches) |
| Connector Option | 02 (with miniature male coaxial connector) |
| Power Input | -17.5 Vde 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% (system calibrated); ±9.5% including interchangeability errors |
| Linearity | Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line (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 |
| 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 |
| Corrosion Resistance (8 mm probes only) | Not affected by direct contact to: air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, or DMF |
| System Weight | 1.3 lbs. (0.59 kg) |
Industry Applications for Reliable Vibration Monitoring
Its 200 mV/mil scale factor and 0 to 10 kHz frequency response enable early detection of shaft misalignment, unbalance, and bearing wear. The 8 mm probe withstands direct contact with lube oil and common industrial chemicals, making it suitable for compressor and pump applications. By integrating this component into a condition monitoring program, you reduce unplanned downtime and extend equipment life.
Installation and Setup Guidance
Mount the probe using the 3/8-24 threaded case into a standard mounting bracket. Ensure the total length of 0.5 metre (20 inches) is correctly routed to the proximitor. The miniature male coaxial connector requires a compatible female connector for signal transmission. Maintain the calibrated range gap of 10 to 80 mils from the target shaft surface. Power the system with -17.5 Vde to -26 Vdc at 12 mA maximum. Verify scale factor and linearity per the system calibration procedure.
Maintenance and Reliability
Inspect the probe tip and cable periodically for physical damage or contamination. The corrosion-resistant design tolerates exposure to water, lube oil, and several chemicals. Operate the probe within -30°F to +350°F and the proximitor within -60°F to +212°F. Keep relative humidity below 95% noncondensing. No field calibration is required if the system was calibrated as an unit.
Selection Guide and Purchasing Advice
When selecting the 21504-00-56-05-02, confirm your required total length and connector type. This variant includes a 0.5 metre cable with a miniature male coaxial connector. For other lengths or connector options, consult the 7200 series ordering guide. AutoDCSTech stocks this Bently Nevada probe as new and original in factory packing with a 12-month warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 21504-00-56-05-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
