Introduction
The Bently Nevada 21504-000-032-05-02 is a 7200 Series 8 mm standard mount proximity probe developed for non-contact measurement of shaft position and vibration in rotating machinery. Its compact probe construction and conventional mounting arrangement make it a practical sensing solution for established machinery-monitoring installations.
Configured with a 32 mm overall case length, 0.5 meter total length, and miniature male coaxial connector, this model is suited to applications where a compact probe body and clearly defined cable connection are required. It can be incorporated into compatible proximity monitoring systems used on turbines, compressors, pumps, motors, and other rotating equipment.
For maintenance teams supporting long-service industrial assets, the 21504-000-032-05-02 offers a straightforward replacement option when maintaining an existing 7200 Series measurement architecture. Its value comes from combining compact mechanical dimensions with the proven non-contact sensing principle required for continuous shaft monitoring.
Technical Specifications
The 21504 Series uses an ordering structure that identifies probe configuration, overall case length, total system length, and connector arrangement. For 21504-000-032-05-02, the configuration corresponds to a standard 8 mm probe with a 32 mm case length, 0.5 meter total length, and miniature male coaxial connector.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 21504-000-032-05-02 |
| Product Series | 7200 Series |
| Product Type | 8 mm Standard Mount Probe |
| Probe Diameter | 8 mm |
| Mounting Type | Standard Mount |
| Thread Type | 3/8-24 |
| Unthreaded Length | 0 mm |
| Overall Case Length | 32 mm |
| Total Length | 0.5 m / approximately 20 in |
| Connector | Miniature male coaxial connector |
| Measurement Principle | Eddy-current, non-contact proximity sensing |
| Primary Measurement | Shaft displacement / relative vibration |
| Typical Machinery | Turbines, compressors, pumps, motors and generators |
| Typical System Role | Machinery condition monitoring and protection |
| Probe Material | Industrial-duty metal construction |
| Overall Dimensions | Approximately 32 mm case length; installation envelope depends on connector and cable routing |
| Approximate Product Weight | Approximately 0.45 kg |
| Operating Temperature | Configuration and system dependent; verify installation requirements |
| Compatible System Components | Appropriate 7200 Series driver, extension cable and monitoring electronics |
Applications
Turbine Shaft Vibration Monitoring
The 21504-000-032-05-02 can be used as part of a proximity measurement arrangement for turbine shafts. Continuous shaft displacement information can help monitoring equipment identify changes in rotor behavior and support machinery protection strategies.
Compressor Monitoring
High-speed compressors benefit from stable shaft measurements because changes in vibration or rotor position may indicate developing mechanical conditions. A compatible 8 mm proximity probe provides a non-contact sensing point for these applications.
Pump and Motor Monitoring
The compact 21504 probe format is suitable for many pump and motor installations where space around the sensing location is limited. It can provide the proximity signal required for shaft-position and vibration monitoring.
Generator Applications
In generator systems, shaft movement can be monitored through properly positioned proximity probes. The standard-mount configuration provides a conventional mechanical arrangement for integrating the sensor into existing machinery-monitoring equipment.
Legacy 7200 Series Installations
The model is particularly useful for maintenance programs supporting established 7200 Series systems. Keeping the correct spare probe available can simplify replacement work and help reduce the time required to restore a monitoring channel.
Condition-Based Maintenance
When connected to compatible monitoring electronics, proximity measurements can be trended over time to support condition-based maintenance decisions. Changes in shaft behavior can be evaluated alongside operating conditions and other machine measurements.
Advantages
Compact 32 mm Case
The 32 mm overall case length provides a relatively compact probe body for installations where available mounting space is restricted. This can be useful when working around bearing housings and other confined machinery structures.
Standard Mount Configuration
The standard-mount design provides a familiar installation approach for machinery already configured around conventional proximity-probe mounting hardware.
8 mm Sensing Format
The 8 mm probe diameter offers a practical balance between compact installation and reliable shaft measurement, making it suitable for a broad range of industrial rotating equipment.
0.5 Meter Total Length
The 0.5 meter total length is well suited to installations where the probe-to-system connection distance is relatively short. Matching the required system length remains important when selecting associated cables and electronics.
Miniature Coaxial Connection
The miniature male coaxial connector provides a defined electrical connection for compatible system components and helps simplify identification during maintenance and replacement.
Non-Contact Measurement
The eddy-current sensing principle allows shaft movement to be measured without physical contact with the rotating target. This makes the probe suitable for continuous operation and avoids wear at the sensing interface.
Practical Replacement Option
For facilities maintaining installed 7200 Series equipment, an exact replacement probe can often be a more efficient maintenance solution than modifying the entire sensing arrangement.
Industrial Monitoring Capability
The probe is intended for use as part of a complete machinery-monitoring system, providing useful displacement information for equipment where reliable shaft behavior data is important.
Technical FAQs
1. What is the Bently Nevada 21504-000-032-05-02?
The 21504-000-032-05-02 is a 7200 Series 8 mm standard mount proximity probe used for non-contact measurement of rotating-shaft position and vibration.
2. What is the probe diameter?
The probe has an 8 mm diameter, making it part of the standard 8 mm proximity-probe configuration used for rotating machinery monitoring.
3. What is the overall case length?
The model uses a 32 mm overall case length. This dimension is identified by the “032” section of the part number.
4. What is the total probe length?
The configuration provides a 0.5 meter, approximately 20-inch total length. The actual system arrangement should be checked before installation to ensure the probe and associated cable configuration meet the required system length.
5. What connector does this model use?
The 21504-000-032-05-02 is configured with a miniature male coaxial connector. The connector type should be matched to the corresponding system components before replacement.
6. What type of measurement does the probe perform?
It uses non-contact proximity sensing to detect changes in the distance between the probe tip and a conductive rotating target. The resulting signal can be used for shaft displacement and vibration monitoring.
7. What mounting thread is used?
The standard configuration uses a 3/8-24 mounting thread. The existing machine mounting point should be checked before installation to ensure the mechanical interface is correct.
8. What are the dimensions and weight of the probe?
The principal case dimension is 32 mm overall case length, with an 8 mm probe diameter. Product listings report an approximate weight of 0.45 kg. The actual supplied weight can vary depending on packaging and the complete assembly.
9. Can this probe replace another 7200 Series 8 mm probe?
Not automatically. Other 7200 Series probes may use different case lengths, total lengths, cable configurations, connectors, or mounting arrangements. The complete part number should be compared before selecting a replacement.
10. Is this probe suitable for modern machinery-monitoring systems?
Its suitability depends on the monitoring architecture. The 21504-000-032-05-02 is a 7200 Series component and should be matched with the appropriate compatible driver, cable, and monitoring equipment. It should not be assumed to be directly interchangeable with every newer Bently Nevada proximity system.
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