Extended-Range Thermal Growth Measurement for Large Turbine Applications

The Bently Nevada 24765-03-00 Case Expansion Transducer Assembly is a precision displacement monitoring device designed to measure large-scale thermal expansion of turbine casings and other critical rotating machinery structures. As part of the Bently Nevada 24765 Case Expansion Transducer Series, this assembly provides essential position feedback within Turbine Supervisory Instrumentation (TSI) systems, helping operators monitor casing movement during startup, shutdown, and steady-state operation.

Featuring a DC Linear Variable Differential Transformer (LVDT) sensing mechanism, the 24765-03-00 converts mechanical movement caused by thermal growth into a proportional electrical output signal. With an extended 101.6 mm (4.00 in) linear measurement range, this model is designed for large turbine installations where greater casing movement must be accurately monitored. The rugged enclosure design ensures reliable operation in demanding industrial environments, supporting long-term machinery protection and predictive maintenance strategies.

Technical Specifications

Technical FAQs

1. What is the main function of the Bently Nevada 24765-03-00?

The 24765-03-00 measures thermal expansion of turbine casings relative to the machine foundation, providing displacement information for turbine monitoring and protection systems.

2. What sensing technology does this assembly use?

It uses a DC LVDT (Linear Variable Differential Transformer) sensor to convert linear mechanical movement into an electrical measurement signal.

3. What is the measurement range of this model?

This model provides a 101.6 mm (4.00 inch) linear measurement range, making it suitable for large thermal expansion applications.

4. Does the 24765-03-00 include a spring return mechanism?

No. The -00 suffix indicates the configuration without spring return.

5. What power supply is required?

The transducer requires a +24 VDC power supply with a minimum current of 30 mA.

6. What is the electrical scale factor?

The scale factor is 0.143 V/mm (3.63 V/in), providing a proportional output related to measured casing movement.

7. Why is case expansion monitoring important?

Monitoring turbine casing expansion helps identify uneven thermal growth, mechanical restrictions, and potential alignment problems that may affect equipment reliability.

8. Which equipment commonly uses this transducer?

It is commonly installed on large steam turbines, generators, compressors, and other critical rotating machinery requiring thermal movement monitoring.

9. Can this assembly be integrated with Bently Nevada monitoring systems?

Yes. The 24765 series is designed for use with compatible Bently Nevada turbine monitoring systems, including position monitoring applications.

10. Why choose the 24765-03-00 model?

Its extended measurement range, proven LVDT technology, and rugged industrial construction make it a reliable solution for monitoring large turbine casing movements where standard-range transducers may not be sufficient.