Engineered for Accurate Turbine Case Expansion Monitoring
The Bently Nevada 24765-02-00 Case Expansion Transducer Assembly is a precision displacement measurement device developed for monitoring thermal case growth in large steam turbines and other critical rotating machinery. Designed as part of Bently Nevada's Case Expansion Transducer System, this assembly provides highly accurate position feedback that enables operators to monitor casing expansion during startup, load changes, and normal operation, helping protect valuable equipment from thermal distortion and mechanical interference.
Utilizing proven DC Linear Variable Differential Transformer (LVDT) technology, the 24765-02-00 delivers stable analog output with excellent linearity over an extended measurement range. This version features a 50.8 mm (2.0 inch) linear range and does not include a spring return, making it suitable for installations where external mechanical guidance is provided. Its weatherproof housing and industrial-grade construction ensure dependable performance in demanding power generation and process industry environments.
Product Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 24765-02-00 |
| Product Type | Case Expansion Transducer Assembly |
| Measurement Technology | DC LVDT (Linear Variable Differential Transformer) |
| Linear Range | 50.8 mm (2.00 in) |
| Spring Return | No |
| Scale Factor | 0.404 V/mm (10.25 V/in) |
| Frequency Response | -3 dB at 15 Hz |
| Input Power | +24 VDC, 30 mA minimum |
| Minimum Load Resistance | 50 kΩ |
| Linearity | ±0.5% Full Scale |
| Stability | ±0.125% Full Scale |
| Operating Temperature | -18°C to +71°C |
| Storage Temperature | -54°C to +93°C |
| Enclosure | Weatherproof Protective Housing |
| Dimensions | Approx. 241 × 117 × 89 mm |
| Weight | Approx. 2.3 kg |
Typical Industry Applications
Designed for dependable operation in turbine supervisory systems, the 24765-02-00 is widely used in applications requiring continuous case expansion measurement, including:
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Steam turbine supervisory instrumentation (TSI)
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Gas turbine monitoring systems
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Combined-cycle power plants
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Thermal power generation facilities
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Industrial turbine packages
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Petrochemical processing plants
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Oil & gas compressor stations
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Large rotating machinery protection systems
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Generator casing movement monitoring
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Predictive maintenance and asset management programs
Technical FAQs
1. What is the primary function of the 24765-02-00?
It measures the thermal expansion of turbine casings relative to the machine foundation, allowing operators to monitor casing movement during startup and operation.
2. Which sensing technology is used?
The assembly uses DC LVDT (Linear Variable Differential Transformer) technology for highly accurate linear displacement measurement.
3. What is the measuring range?
The 24765-02-00 offers a 50.8 mm (2.00 inch) linear measurement range, making it suitable for larger turbine expansion applications.
4. Does this version include a spring return?
No. The -00 configuration is supplied without a spring return mechanism.
5. What input power is required?
The transducer operates from a +24 VDC supply with a minimum current requirement of 30 mA.
6. What is the scale factor?
The output scale factor is 0.404 V/mm (10.25 V/in), providing accurate analog displacement signals.
7. Which monitoring systems are compatible?
The transducer is designed for use with compatible Bently Nevada 3300 and 3500 Series Position Monitoring Systems, including turbine supervisory instrumentation applications.
8. Why is case expansion monitoring important?
Monitoring thermal growth helps detect uneven casing movement, preventing excessive mechanical stress, rotor-to-stator rubbing, and potential equipment failure during turbine operation.
9. What industries commonly use this assembly?
It is widely installed in power generation, petrochemical, oil & gas, and other heavy industrial facilities operating large rotating equipment.
10. What makes the 24765-02-00 a dependable solution?
Its combination of proven LVDT technology, rugged environmental protection, wide measurement range, and compatibility with industry-standard monitoring systems delivers reliable long-term performance for critical machinery protection.
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