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- Bently Nevada
- 24765-03-01
- Case Expansion Transducer Assembly
- USA
- 88.9 × 117 × 328 mm
- 2.7 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 24765-03-01 Case Expansion Transducer Assembly is used for monitoring casing expansion on large rotating machinery. It is suited to applications where changes in machine casing position need to be tracked during startup, shutdown, load changes, and normal operating conditions.
Case expansion monitoring is commonly applied to steam turbines, gas turbines, compressors, and other large machines where thermal growth can produce measurable movement between the machine casing and its surrounding structure. The 24765-03-01 assembly forms part of the measurement arrangement used to capture this movement and send the resulting condition information into a machinery monitoring system.
In a typical installation, the transducer assembly is mounted at a designated measurement location on the machine casing. As the casing moves because of thermal expansion or contraction, the sensing arrangement detects the corresponding displacement. The monitoring system can then use this information together with other machine measurements to evaluate thermal behavior and operating condition.
The assembly is particularly relevant to machinery protection and condition monitoring applications where casing growth must remain within the expected mechanical range. It can also support commissioning and maintenance activities by allowing engineers to compare actual casing movement against established operating behavior.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 24765-03-01 |
| Product Type | Case Expansion Transducer Assembly |
| Application | Casing expansion monitoring for rotating machinery |
| Function | Measurement of casing movement caused by thermal expansion and contraction |
| Dimensions | 88.9 × 117 × 328 mm |
| Weight | 2.7 kg |
Product Features
- Intended for case expansion measurement on large rotating equipment.
- Supports monitoring of casing movement during thermal transients and steady-state operation.
- Suitable for integration into machinery condition monitoring arrangements.
- Provides a dedicated measurement assembly for applications where casing growth is a critical operating parameter.
- Can be used alongside other Bently Nevada vibration, position, and machine condition monitoring devices.
- Applicable to turbine, compressor, and other large rotating machinery installations.
Working Principle
The 24765-03-01 assembly monitors relative movement associated with expansion or contraction of the machine casing.
During startup, the casing gradually heats and expands. During shutdown or reduced-load operation, it cools and contracts. The resulting mechanical movement changes the position of the monitored measurement point relative to the fixed reference arrangement.
The transducer assembly detects this displacement and converts the mechanical movement into a measurement signal suitable for the connected monitoring electronics. The monitoring system processes the signal and presents casing expansion information to the control room or machinery monitoring interface.
A typical measurement path can be represented as:
Machine Casing Movement → 24765-03-01 Transducer Assembly → Monitoring Electronics → Machinery Monitoring System → Operator / Control System
The measured casing expansion can be reviewed together with shaft vibration, axial position, speed, temperature, and other operating parameters. This gives maintenance and operations personnel a more complete view of machine behavior during thermal transitions.
Role in a Machinery Condition Monitoring Control Architecture
The 24765-03-01 is normally used as part of the field measurement layer rather than as a standalone monitoring controller. Its function is to provide casing expansion information to the associated machinery monitoring equipment.
Casing → Transducer Assembly → Signal Conditioning / Monitoring Module → Machinery Monitoring System → Control Room
| System Element | Function |
|---|---|
| Machine Casing | Produces the mechanical movement associated with thermal growth and contraction |
| 24765-03-01 | Detects and represents casing expansion movement |
| Monitoring Electronics | Processes the transducer signal for monitoring and protection functions |
| Machinery Monitoring System | Displays, records, alarms, and analyzes casing expansion data |
| Control System / Operator Interface | Uses the measurement for operational awareness and machinery management |
Casing expansion data is especially useful during startup and shutdown because the rate and magnitude of thermal movement can change significantly during these periods. When combined with other machinery measurements, it helps maintenance personnel distinguish expected thermal movement from abnormal mechanical behavior.
Industrial Applications
| Application | Use of the 24765-03-01 |
|---|---|
| Steam Turbines | Monitoring casing expansion during startup, load changes, and shutdown |
| Gas Turbines | Tracking thermal casing movement during operating transitions |
| Large Compressors | Supporting mechanical condition monitoring where casing growth is significant |
| Power Generation Equipment | Monitoring thermal movement as part of turbine machinery instrumentation |
| Process Machinery | Providing casing displacement information for large rotating equipment |
| Machinery Commissioning | Establishing and checking expected casing expansion behavior during operating tests |
Installation and Maintenance
- Confirm the measurement location
Install the assembly at the machine location specified by the equipment design so that the measured movement corresponds to the intended casing expansion direction. - Check the mounting surface
The mounting area should be clean, mechanically sound, and free from debris that could introduce unwanted movement between the transducer assembly and the machine reference point. - Maintain the intended measurement geometry
The mechanical relationship between the sensing assembly and the casing must follow the original installation arrangement. Changes in geometry can affect the measured displacement. - Inspect mechanical fasteners
Check mounting hardware during scheduled maintenance to ensure that vibration or repeated thermal cycling has not caused loosening. - Protect the measurement assembly
Avoid unnecessary mechanical impact, excessive vibration, or external forces that could affect the transducer assembly. - Verify cable routing
Keep associated wiring away from hot surfaces, moving components, and locations where mechanical abrasion could occur. - Check electrical connections
Inspect connectors and termination points for looseness, corrosion, contamination, or signs of thermal damage. - Compare readings with normal operating behavior
Review casing expansion trends during startup and shutdown rather than relying only on a single instantaneous reading. - Investigate unexpected changes
A sudden change in casing expansion indication should be checked against machine temperature, load, speed, and other related measurements before concluding that the transducer itself has failed. - Check during major overhauls
During turbine or compressor overhaul work, verify that the transducer mounting arrangement has not been disturbed or repositioned. - Preserve the original reference condition
If the assembly is removed and reinstalled, maintain the established mechanical reference and installation position to avoid introducing a measurement offset. - Use system-level verification after replacement
After replacing the assembly or associated monitoring hardware, verify the complete measurement chain from the field device through the monitoring system before returning the machine to normal service.
Compatible System Components
| Component Type | Typical Role |
|---|---|
| Machinery Monitoring System | Receives and processes casing expansion measurements |
| Signal Conditioning Equipment | Conditions the transducer output for monitoring electronics |
| Monitoring Input Module | Accepts the measurement signal and makes it available to the monitoring system |
| Control Room Interface | Displays casing expansion values, trends, and alarms |
| Turbine Control System | Uses associated machine condition information during operation |
| Bently Nevada Monitoring Devices | Provides complementary vibration, position, speed, or temperature measurements |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Bently Nevada 3300 Series | Machinery Monitoring System | Continuous monitoring and protection of rotating machinery |
| Bently Nevada 3500 Series | Machinery Monitoring System | Machinery condition monitoring and protection |
| Bently Nevada 3300 XL Series | Proximity Measurement System | Shaft position and vibration measurement |
| Bently Nevada 3300 NSv Series | Proximity Probe | Measurement of shaft displacement and vibration |
| Bently Nevada 7200 Series | Proximity Transducer System | Industrial rotating machinery monitoring |
Key Advantages
- Dedicated measurement arrangement for casing expansion monitoring.
- Suitable for large rotating machinery with significant thermal movement.
- Supports startup, shutdown, and load-transition monitoring.
- Can be integrated with broader machinery protection and condition monitoring systems.
- Useful for correlating casing movement with other machine operating parameters.
- Suitable for maintenance and commissioning activities where thermal growth behavior must be verified.
Technical FAQs
What does the Bently Nevada 24765-03-01 measure?
The 24765-03-01 is a case expansion transducer assembly used to monitor movement of a machine casing associated with thermal expansion and contraction.
Where is a case expansion transducer assembly typically used?
It is commonly associated with large rotating machinery such as steam turbines, gas turbines, compressors, and other equipment where casing thermal growth needs to be monitored.
Why is case expansion monitoring important during turbine startup?
During startup, machine temperature and load change rapidly, causing the casing to expand. Monitoring this movement helps operators and maintenance personnel compare actual thermal growth with the machine’s expected operating behavior.
What should be checked when the casing expansion reading changes unexpectedly?
The measurement should be evaluated together with machine temperature, speed, load, vibration, and other relevant parameters. The transducer mounting, mechanical reference, wiring, and associated monitoring electronics should also be inspected before identifying the transducer as the cause.