Technical Specifications Breakdown
Key parameters for the 21504-20-32-10-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Model | 21504-20-32-10-02 |
| Manufacturer | Bently Nevada |
| Probe Diameter | 8 mm |
| Thread Size | 3/8-24 |
| Unthreaded Length Option | 200 mm |
| Overall Case Length Option | 3.2 in |
| Total Length Option | 1.0 metre (39 inches) Tolerance: +.25 metre,-.10 metre (+ 10 inches,-4 inches) |
| Connector Option | With miniature male coaxial connector |
| Power | -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% (measured in increments of 10 mils over the calibrated range) if 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) of a 200 mV/mil straight line including interchangeability errors |
| Frequency Response | 0 to 10 kHz (0 to 600,000 cpm); -5% at 10 kHz (600,000 cpm) |
| Temperature Sensitivity | Typically -396 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) | Probe operation is not affected by direct contact to the following: air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK (methyl-ethyl-ketone) or DMF (Dimethylformamide) |
| System Weight | 1.3 lbs. (0.59 kg) |
Industry Applications for the 21504-20-32-10-02
The 80 mil (2.0 mm) calibrated range covers typical shaft vibration amplitudes in most industrial machines. With a frequency response up to 10 kHz (600,000 cpm), it captures both slow-speed and high-speed events, making it suitable for gearboxes and high-speed spindles. The corrosion-resistant construction (8 mm probes only) allows direct exposure to lube oil, water, and mild chemicals without performance degradation.
Installation & Setup Guidance
Proper installation is critical for accurate readings. Mount the probe using the 3/8-24 thread into a rigid bracket or housing, ensuring the probe face is perpendicular to the target shaft. The unthreaded length of 200 mm provides flexibility for routing through conduit or cable trays. The total length of 1.0 metre (39 inches) with a tolerance of +.25 metre/-.10 metre allows for some adjustment during installation. Connect the miniature male coaxial connector to the proximitor input. Verify the initial gap setting: the calibrated range begins at approximately 10 mils (0.25 mm) from the probe face. Use a non-ferrous target material for best linearity.
High-Reliability Vibration Monitoring for Critical Machinery
Industrial rotating assets demand precise, continuous vibration measurement to prevent unplanned downtime and catastrophic failures. The Bently Nevada 21504-20-32-10-02 proximity probe delivers the proven performance and rugged construction required for 24/7 operation in harsh environments. As part of the 7200 series, this 8 mm probe is engineered to provide accurate displacement readings directly from the shaft surface, enabling early detection of bearing wear, imbalance, and misalignment.
Maintenance & Reliability
The Bently Nevada 21504-20-32-10-02 requires minimal maintenance under normal operating conditions. Inspect the probe tip and cable periodically for physical damage or contamination. The probe and extension cable are rated for -30°F to +350°F (-34°C to +177°C), while the proximitor operates from -60°F to +212°F (-51°C to +100°C). Ensure the environment does not exceed 95% relative humidity, noncondensing. The system weight of 1.3 lbs. (0.59 kg) is light enough for most mounting brackets.
Selection Guide & Purchasing Advice
When selecting a replacement or spare probe, verify the unthreaded length, overall case length, and total length match your existing installation. The 21504-20-32-10-02 is a new original Bently Nevada unit in factory packing with a 12-month warranty from AutoDCSTech. Please verify current lifecycle status and availability with AutoDCSTech before ordering. For applications requiring different cable lengths or connector types, contact our team for compatible options.
Availability & Condition at AutoDCSTech
| Part Number | 21504-20-32-10-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
