High-Accuracy Case Expansion Sensor for Critical Turbine Protection
The Bently Nevada 24765-02-01 Case Expansion Transducer Assembly is a precision displacement measurement device engineered for monitoring thermal case expansion in large steam turbines and other critical rotating machinery. As part of the renowned Bently Nevada Turbine Supervisory Instrumentation (TSI) portfolio, this assembly continuously measures the relative movement between the turbine casing and its foundation, enabling operators to detect abnormal thermal growth, maintain alignment, and prevent costly equipment damage.
Built around proven DC Linear Variable Differential Transformer (LVDT) technology, the 24765-02-01 delivers highly stable and repeatable displacement measurements throughout startup, load changes, and normal operation. This configuration features a 50.8 mm (2.0 inch) linear measurement range and an integrated spring return mechanism, ensuring reliable mechanical contact for consistent monitoring performance even under varying operating conditions. Its weather-resistant enclosure and industrial-grade construction make it an excellent choice for demanding power generation and process industry applications.
Product Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 24765-02-01 |
| Product Type | Case Expansion Transducer Assembly |
| Measurement Technology | DC Linear Variable Differential Transformer (LVDT) |
| Linear Range | 50.8 mm (2.00 in) |
| Spring Return | Yes |
| 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 |
| Protective Enclosure | Weatherproof Industrial Housing |
| Dimensions | Approx. 241 × 117 × 89 mm |
| Weight | Approx. 2.3 kg |
Typical Applications
Designed for continuous monitoring of thermal movement in mission-critical machinery, the 24765-02-01 is widely applied in:
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Steam turbine supervisory instrumentation (TSI)
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Gas turbine thermal growth monitoring
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Combined-cycle power plants
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Fossil fuel and nuclear power stations
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Industrial turbine packages
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Petrochemical processing facilities
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Oil & gas compressor installations
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Generator casing expansion monitoring
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Heavy rotating equipment protection
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Predictive maintenance and condition monitoring systems
Technical FAQs
1. What is the purpose of the Bently Nevada 24765-02-01?
The 24765-02-01 measures thermal expansion of turbine casings relative to the machine foundation, providing critical information for turbine protection and supervisory monitoring systems.
2. Which sensing technology does this model use?
It utilizes DC Linear Variable Differential Transformer (LVDT) technology for precise linear displacement measurement.
3. What is the measurement range?
The assembly provides a 50.8 mm (2.00 inch) linear range, making it suitable for applications with greater casing movement.
4. Does this version include a spring return?
Yes. The -01 configuration includes an integrated spring return mechanism, ensuring stable probe contact throughout machine operation.
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 output scale factor?
The output sensitivity is 0.404 V/mm (10.25 V/in), providing accurate analog displacement signals for monitoring systems.
7. Which monitoring systems are compatible?
The 24765-02-01 is designed for use with compatible Bently Nevada 3300 Series, 3500 Series, and other Turbine Supervisory Instrumentation (TSI) systems.
8. Why is case expansion monitoring important?
Monitoring thermal casing growth helps detect uneven expansion, preventing excessive mechanical stress, rotor-to-stator rubbing, and premature equipment failure during startup and operation.
9. Which industries commonly use this transducer?
It is extensively used in power generation, petrochemical, oil & gas, and heavy industrial facilities operating large rotating equipment.
10. Why choose the Bently Nevada 24765-02-01?
Its combination of high-precision LVDT sensing, integrated spring return, rugged construction, and proven compatibility with Bently Nevada monitoring systems makes it an excellent solution for reliable turbine condition monitoring and long-term asset protection.
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