Precision Vibration Monitoring for Critical Machinery
When protecting rotating assets like turbines, compressors, and pumps, accurate shaft vibration measurement is non-negotiable. The Bently Nevada 21505-00-20-10-02 is an 8 mm probe proximity vibration transducer engineered to deliver reliable data in demanding industrial environments. This component is part of the trusted 7200 Proximity Transducer Systems family, designed for continuous monitoring of radial shaft vibration and position.
Technical Specifications Breakdown
Key parameters for the 21505-00-20-10-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Model | 21505 7200 Proximity Transducer Systems |
| Tip Diameter | 8 mm |
| Unthreaded Length Option | 00- 0.0 in |
| Overall Case Length Option | 20- 2.0 in |
| Total Length Option | 10 -1.0 metre (39 inches) Tolerance: +.25 metre,-.10 metre(+ 10 inches,-4 inches) |
| Connector Option | 02 -With miniature male coaxial connector |
| Configuration Type Threads | 3/8-24 |
| Lead Armor | Yes (stainless steel) |
| Power | -17.5 Vde to -26 Vdc at 12 mAmaximum 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 of10 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 a200 mV/mil straight line if calibrated asa system. Within 2.3 mils (0.06 mm) ofa 200 mV/mil straight line includinginterchangeability errors |
| Frequency Response | 0 to 10 kHz(0 to 600,000 cpm); -5% at 10 kHz(600,000 cpm) |
| Temperature Sensitivity | Typically -396change in scale factor at + 150°F(+ 65°C) at 50 mils gap (1.27 mm) |
| Operating Temperature (Proximitor) | -60°F to +212°F(-51°Cto +1009C) |
| Operating Temperature (Probe and Extension Cable) | -30°F to0+350°F(-34°Cto +177°C) |
| Relative Humidity | To 95%,noncondensing |
| Corrosion Resistance (8 mm probes) | Probe operation is not affectedby direct contact to the following: air,water, lube oil, ammonium hydroxide,sulfuric acid (10%), MEK(methyl-ethylkeytone)or DMF (Dimethylfor-mamide) |
| System Weight | 1.3 lbs.(0.59 kg) |
Industrial Applications: Protecting Rotating Assets
In a steam turbine train, for example, the 8 mm probe mounts into a 3/8-24 threaded hole in the bearing housing. The 200 mV/mil scale factor provides high-resolution data to detect early bearing wear or imbalance. The stainless steel lead armor resists oil and moisture, making it suitable for lube oil environments. The wide operating temperature range of the probe (-34°C to +177°C) allows placement near hot casings without signal degradation.
Installation Guidance for Reliable Setup
Proper installation begins with verifying the total length option: the 1.0 metre cable (39 inches, tolerance +.25 m/-.10 m) must reach the proximitor without strain. Use the miniature male coaxial connector for a secure, noise-free connection. The unthreaded length of 0.0 inches means the probe tip extends directly from the threaded section. Ensure the gap is set within the calibrated range (10 to 80 mils from the probe face) for linear output. Avoid bending the stainless steel armor sharply; maintain a minimum bend radius of 2 inches to prevent internal cable damage.
Maintenance and Reliability Considerations
The 21505-00-20-10-02 is designed for long-term, maintenance-free operation under normal conditions. Inspect the probe face periodically for buildup of conductive debris or oil deposits, which can affect the gap measurement. The corrosion-resistant construction (unaffected by air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, or DMF) ensures stable performance in chemically challenging areas. Verify the system calibration annually to maintain the ±4% scale factor accuracy. If the probe is exposed to temperatures outside the operating limits, signal drift may occur.
Selection Guide and Purchasing Advice
When selecting a replacement or spare probe, confirm that the total length, connector type, and thread configuration match your existing system. The 21505-00-20-10-02 is a new, original Bently Nevada unit in factory packing, backed by a 12-month warranty from AutoDCSTech. For critical spares management, stocking this exact part number ensures minimal downtime during unplanned outages. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 21505-00-20-10-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
