Precision Thermal Growth Monitoring Solution for Large Turbine Systems
The Bently Nevada 24765-01-00 Case Expansion Transducer Assembly is a high-accuracy displacement measurement device designed for monitoring thermal expansion of large turbine casings during startup and normal operating conditions. As part of the Bently Nevada Case Expansion Transducer System, this assembly provides critical Turbine Supervisory Instrumentation (TSI) data by measuring the relative movement between the machine casing and its foundation.
Using proven Linear Variable Differential Transformer (LVDT) technology, the 24765-01-00 converts mechanical movement caused by thermal growth into a proportional electrical output signal. This allows operators and protection systems to identify abnormal casing movement, uneven expansion, or mechanical restrictions that could lead to rotor-to-stator contact or equipment damage.
Designed with a ±12.7 mm (±0.5 inch) measurement range, without spring return, and a rugged weather-resistant enclosure, this transducer assembly provides reliable performance in demanding power generation and industrial rotating equipment applications.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 24765-01-00 |
| Product Type | Case Expansion Transducer Assembly |
| Measurement Technology | DC LVDT (Linear Variable Differential Transformer) |
| Application | Turbine Case Expansion Measurement |
| Linear Range | 25.4 mm (1.00 in) |
| Measurement Range | ±12.7 mm (±0.5 in) |
| Spring Return Option | Without Spring Return |
| Input Power | +24 VDC, 30 mA minimum |
| Scale Factor | 0.346 V/mm (8.79 V/in) |
| Linearity | ±0.5% Full Scale |
| Stability | ±0.125% Full Scale |
| Frequency Response | -3 dB at 20 Hz |
| Minimum Load Resistance | 50 kΩ |
| Operating Temperature | -18°C to +71°C |
| Storage Temperature | -54°C to +93°C |
| Housing Type | Weatherproof Protective Enclosure |
| Dimensions | Approx. 241 × 117 × 88.9 mm |
| Weight | Approx. 2.3 kg |
Application Areas
The 24765-01-00 Case Expansion Transducer Assembly is primarily used in applications where accurate measurement of thermal casing movement is essential for safe machine operation.
Typical applications include:
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Steam turbine casing expansion monitoring
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Large turbine supervisory instrumentation systems
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Power generation equipment protection
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Combined cycle power plants
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Industrial turbine systems
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Large rotating machinery alignment monitoring
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Energy production facilities
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Critical mechanical asset protection systems
The system is commonly installed near the turbine foundation opposite the fixed casing location, allowing measurement of casing growth relative to the foundation during temperature changes.
Technical FAQs
1. What is the main function of the Bently Nevada 24765-01-00?
The 24765-01-00 measures turbine casing thermal expansion relative to the machine foundation, providing important position feedback for turbine supervisory monitoring systems.
2. What measurement technology does this assembly use?
It uses an LVDT (Linear Variable Differential Transformer) sensor to measure mechanical displacement and convert it into an electrical output signal.
3. What is the measurement range of this model?
This model provides a 25.4 mm (1.0 inch) linear range, equivalent to approximately ±12.7 mm displacement capability.
4. Does the 24765-01-00 include spring return?
No. The -00 configuration indicates a version without spring return.
5. What power supply is required?
The assembly requires +24 VDC input power with a minimum current requirement of 30 mA.
6. Which monitoring systems can use the output signal?
The transducer output can be connected to compatible Bently Nevada monitoring systems, including turbine supervisory instrumentation platforms.
7. Why is case expansion monitoring important?
Thermal growth differences between turbine casing and rotor components can create alignment problems or mechanical interference. Monitoring expansion helps operators detect abnormal conditions early.
8. What is the scale factor of this model?
The 24765-01-00 provides a scale factor of 0.346 V/mm (8.79 V/in).
9. What type of equipment commonly uses this device?
It is mainly used on large steam turbines and other critical rotating machines where thermal movement monitoring is required.
10. Why choose the Bently Nevada 24765-01-00?
Its combination of LVDT accuracy, rugged construction, stable output characteristics, and compatibility with turbine monitoring systems makes it a reliable choice for protecting high-value rotating equipment.
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