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- Bently Nevada
- 21504-08-28-10-0
- 7200 8 mm Standard Mounting Probe
- USA
- 1 meter
- 0.22 kg
- Xiamen, China
- New & In Stock
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Overview
The Bently Nevada 21504-08-28-10-02 is an 8 mm Standard Mounting Probe designed for the 7200 Proximity Transducer System. It uses non-contact eddy-current technology to measure the relative movement and displacement of a conductive rotating shaft. Unlike a contact sensor, the probe operates across a controlled gap, allowing continuous monitoring without physical contact with the rotating component. With a 1 meter total length, 3/8-24 mounting thread, and miniature male coaxial connector, this probe is intended for critical rotating equipment such as turbines, compressors, pumps, motors, and generators. It is typically installed as part of a complete proximity measurement system together with compatible proximity electronics and monitoring equipment.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand | Bently Nevada |
| Model | 21504-08-28-10-02 |
| Series | 7200 Proximity Transducer System |
| Product Type | 8 mm Standard Mounting Probe |
| Probe Diameter | 8 mm |
| Mounting Type | Standard Mount |
| Mounting Thread | 3/8-24 |
| Total Length | 1 meter |
| Weight | 0.22 kg |
| Connector | Miniature Male Coaxial Connector |
| Measurement Principle | Eddy-Current Proximity Sensing |
| Measurement Method | Non-Contact |
| Primary Measurement | Shaft Displacement and Relative Vibration |
| Calibrated Output Range | 80 mils (2.0 mm) |
| Measurement Range | Approximately 0.25–2.0 mm from probe face |
| Supply Requirement | -17.5 to -26 VDC |
| Maximum Consumption | 12 mA |
| Application | Rotating Machinery Monitoring |
Applications
Turbines
The probe can be installed on steam and gas turbines to monitor shaft vibration and relative displacement, providing measurement data for machinery protection systems.
Compressors
In large compressors, the probe monitors rotor movement and can help identify abnormal shaft behavior associated with developing mechanical problems.
Pumps
The sensor can detect changes in shaft movement on critical industrial pumps, supporting monitoring for imbalance, misalignment, and other mechanical conditions.
Motors and Generators
Large rotating electrical machines can use proximity measurement to monitor shaft position and vibration during continuous operation.
Process Machinery
The probe is suitable for critical rotating equipment used in oil and gas, petrochemical, power generation, and other process industries.
Key Benefits
| Feature | Benefit |
|---|---|
| 8 mm Probe Design | Provides a compact sensing configuration for industrial machinery installations. |
| Non-Contact Operation | Measures shaft movement without physically touching the rotating target. |
| Standard Mounting | Provides a threaded installation arrangement for compatible 7200 system installations. |
| 1 Meter Total Length | Fits applications requiring the specified probe length. |
| Eddy-Current Technology | Detects changes in the position of conductive machine targets during operation. |
| 2.0 mm Calibrated Range | Provides a defined displacement measurement range for shaft monitoring. |
| 7200 System Compatibility | Designed as part of the Bently Nevada 7200 proximity measurement system. |
Related Components
The 21504-08-28-10-02 is normally used as one part of a complete proximity measurement chain.
| Component | Function |
|---|---|
| 21504-08-28-10-02 Probe | Detects relative movement between the probe tip and rotating shaft. |
| 7200 Proximity Transducer | Provides probe excitation and processes the probe signal. |
| Compatible Extension Cable | Connects the probe to the associated proximity electronics where required. |
| Machinery Monitoring System | Receives and analyzes the measurement signal. |
| Shaft Target | Conductive rotating surface detected by the proximity probe. |
| Mounting Hardware | Secures the probe and maintains the required measurement position. |
Installation
The probe should be securely installed with its sensing tip correctly aligned toward the conductive shaft target. The appropriate measurement gap must be established according to the requirements of the applicable 7200 system.
Before replacement, technicians should verify the probe diameter, mounting thread, total length, connector type, compatible proximity electronics, installation position, and cable condition.
A probe with the same diameter but a different mechanical configuration or total length may not be a suitable replacement. Matching the complete part number is therefore recommended when replacing an existing unit.
Troubleshooting
| Problem | Possible Cause | Check |
|---|---|---|
| No Signal | Probe, cable, or transducer problem | Check the complete measurement circuit. |
| Unstable Reading | Incorrect probe gap or loose mounting | Verify probe position and mounting. |
| Excessive Vibration Reading | Actual shaft movement or installation problem | Compare other monitoring channels and inspect the probe. |
| Intermittent Signal | Cable or connector problem | Check cable routing and connector condition. |
| Noisy Output | Electrical interference or connection issue | Inspect signal connections and surrounding electrical equipment. |
Recommended Models
| Model | Product Type | Application |
|---|---|---|
| 21504-08-28-10-02 | 7200 8 mm Standard Mounting Probe | Shaft vibration and displacement monitoring |
| 21504-00-28-10-02 | 7200 8 mm Standard Mounting Probe | Alternative standard mounting configuration |
| 21504-00-08-10-02 | 7200 8 mm Standard Mounting Probe | Shorter installation requirements |
| 21504-00-20-10-02 | 7200 8 mm Standard Mounting Probe | Alternative standard mounting installation |
| 21504-00-40-10-02 | 7200 8 mm Standard Mounting Probe | Different probe body length requirements |
| 21504-016-032-10-02 | 7200 Proximity Probe | Alternative 7200-series monitoring application |
Related Products
| Product / Series | Type | Main Use |
|---|---|---|
| 7200 Series | Proximity Transducer System | Shaft vibration and displacement monitoring |
| 3300 XL 8 mm Series | Proximity Probe System | Rotating machinery condition monitoring |
| 3300 XL Proximitor Sensor | Proximity Signal Conditioner | Probe signal processing |
| 3300 XL Extension Cable | Extension Cable | Probe-to-transducer connection |
| 3300 XL 8 mm Probe | Eddy-Current Proximity Probe | Shaft movement monitoring |
| 3300 Monitoring System | Machinery Monitoring System | Machinery protection and condition monitoring |
Technical FAQs
1. What is Bently Nevada 21504-08-28-10-02 used for?
It is an 8 mm Standard Mounting Probe used with the Bently Nevada 7200 Proximity Transducer System for non-contact measurement of shaft displacement and relative vibration on rotating machinery.
2. What are the total length and weight?
The specified total length is 1 meter, and the product weight is 0.22 kg.
3. What is the mounting configuration?
The probe uses a Standard Mount configuration with a 3/8-24 mounting thread. The mounting arrangement should be verified before installing a replacement.
4. Does the probe contact the rotating shaft?
No. The 21504-08-28-10-02 uses eddy-current proximity sensing, so the probe measures shaft movement across a controlled gap without physically contacting the rotating target.
5. What should be checked when replacing this probe?
The complete part number, 8 mm diameter, mounting thread, total length, connector type, compatible 7200 proximity electronics, and required probe gap should all be verified. Matching only the probe diameter is not sufficient to confirm interchangeability.