Excellent PLC
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Product Introduction
The Bently Nevada 21504-000-008-10-02 is a standard 8 mm proximity probe from the trusted 7200 Series, designed for precise and reliable non-contact vibration and displacement measurements in critical rotating machinery. With a proven track record in the field, this probe is part of Bently Nevada’s comprehensive condition monitoring solutions used worldwide in power generation, oil & gas, and process industries.
This particular model, with its 8 mm tip and configured cable length, is optimized for applications that require accurate shaft position and vibration detection, especially in harsh industrial environments. It works in conjunction with matching extension cables and Proximitor sensors to deliver high-fidelity signals for machinery protection systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | 8 mm Proximity Probe |
| Model Number | 21504-000-008-10-02 |
| Series | Bently Nevada 7200 Series |
| Sensing Principle | Eddy current non-contact measurement |
| Shaft Material Compatibility | Ferromagnetic (typically 4140 steel) |
| Total Length | 1 m |
| Thread Size | 3/8-24 UNF |
| Thread Length | 1.0 inch (25.4 mm) |
| Body Style | Standard-mount cylindrical housing |
| Cable Length | 10 feet (approx. 3.05 meters) |
| Connector Type | Miniature coaxial connector |
| Temperature Range | -35°C to +120°C (operational) |
| Vibration Tolerance | Up to 20 g peak |
| Frequency Response | 0 to 10 kHz |
| Linearity | ±0.25 mils over 80 mils range (±6 µm over 2 mm) |
| Sensitivity | 200 mV/mil (7.87 mV/µm) |
| System Calibration | Must be used with matching extension cable and Proximitor sensor |
| Weight | 1.2 kg |
| Ingress Protection | IP65 rated (when installed with proper sealing) |
| Certifications | CE, RoHS compliant |
Applications
The Bently Nevada 21504-000-008-10-02 is widely used in various critical rotating equipment and machinery, including but not limited to:
-
Steam and Gas Turbines
For shaft vibration, position, and thrust measurements to protect against catastrophic failure. -
Compressors (Centrifugal & Reciprocating)
Monitor mechanical integrity and alignment in high-speed, high-load environments. -
Industrial Pumps
Detect cavitation-induced vibration and misalignment to reduce maintenance costs. -
Motors and Generators
Track bearing wear, rotor position, and detect early signs of mechanical imbalance. -
Gearboxes and Couplings
Identify excessive axial or radial displacement, preventing gear damage. -
Fans and Blowers
Ensure balance and stability in high-RPM ventilation and cooling systems.
Product Advantages
-
High Accuracy and Stability
Designed to meet strict linearity and sensitivity standards, ensuring reliable readings over long-term operation. -
Non-Contact Design
Eliminates mechanical wear and allows safe distance-based measurement in harsh environments. -
Field Proven Reliability
Thousands of installations globally attest to its durability and measurement consistency. -
Rugged Construction
Sealed body, robust materials, and IP-rated design offer resistance against contaminants, temperature, and vibration. -
System Compatibility
Fully compatible with Bently Nevada’s 7200 and 3300 series extension cables and Proximitor sensors for end-to-end monitoring. -
Low Maintenance Requirements
Once installed and calibrated, requires minimal user interaction or servicing. -
Flexible Installation
Standard thread and cable configurations make it adaptable across a wide range of OEM and retrofit applications.
Frequently Asked Questions (FAQ)
-
What material types is this proximity probe compatible with?
It’s calibrated for ferromagnetic materials, typically 4140 steel or equivalent. -
Can I use this probe with a 3300 XL extension cable?
No, it must be matched with 7200 series components to maintain proper system calibration. -
What is the operating temperature range of this probe?
It operates between -35°C and +120°C. -
How far from the shaft should the probe tip be placed?
The typical gap is 50 mils (1.27 mm), but it may vary depending on the system calibration. -
Is this probe ATEX or explosion-proof rated?
This specific model is not ATEX-rated; check Bently’s hazardous area models for such environments. -
Can I shorten the probe cable to match my setup?
No, altering the cable length affects calibration. Always use the factory-assembled length. -
What tools are needed to install the probe?
A torque wrench and proper mounting brackets suited for 3/8-24 UNF threads. -
Is the connector waterproof?
It is not waterproof on its own. Use protective boots or enclosures in wet environments. -
How often should I recalibrate the system?
Recalibration is recommended during major overhauls or every 3-5 years depending on conditions. -
Can I use this probe on a gearbox shaft?
Yes, it is commonly used for both radial and axial vibration monitoring on gearboxes.
Related Models – Same Series or Similar Functionality
| Model | Description | Cable Length | Tip Diameter | Application |
|---|---|---|---|---|
| 21504-000-005-10-02 | 7200 Series 5 mm Probe | 10 ft | 5 mm | Limited-space applications |
| 21510-000-008-10-02 | Reverse mount 8 mm Probe | 10 ft | 8 mm | Space-constrained reverse installs |
| 330101-00-08-10-02 | 3300 XL 8 mm Probe | 10 ft | 8 mm | New-generation proximity systems |
| 330103-00-05-10-02 | 3300 XL 5 mm Probe | 10 ft | 5 mm | Compact probe for tight locations |
| 991-04-50-01-00 | Accelerometer-style probe | N/A | N/A | Case-mounted acceleration readings |
| 7200-14-10-01 | 7200 Series Proximitor Sensor | N/A | N/A | Companion to 21504 probe |
Popular Bently Nevada Modules and Devices
| Model | Description | Category | Function |
|---|---|---|---|
| 330104-00-05-10-02 | 3300 XL Proximitor Probe | Proximity Probe | Shaft displacement and vibration monitoring |
| 3500/22M | Transient Data Interface Module | Monitoring Rack Module | Communication with system software |
| 3500/42M | Proximitor Monitor | Monitoring Rack Module | Four-channel prox sensor interface |
| 330180-91-00 | Velomitor Sensor | Velocity Sensor | Measures casing velocity |
| 330500 | High-temperature Accelerometer | Vibration Sensor | Extreme environments |
| 3500/05 | 19-inch Rack Frame | Rack Hardware | Houses 3500 monitoring modules |
