Precision Thermal Growth Measurement Device for Turbine Protection Applications
The Bently Nevada 24765-01-01 Case Expansion Transducer Assembly is a high-performance displacement measurement solution designed to monitor thermal expansion of large rotating machinery, particularly steam turbines and industrial turbine systems. As an essential component of Turbine Supervisory Instrumentation (TSI), this assembly provides accurate casing movement data to help operators evaluate machine startup behavior, thermal growth balance, and mechanical alignment conditions.
Built with a DC Linear Variable Differential Transformer (LVDT) sensing element housed in a protective enclosure, the 24765-01-01 converts mechanical casing movement into a stable electrical output signal. The integrated spring return design helps maintain consistent contact between the sensing rod and the machine structure, improving measurement reliability in applications where continuous thermal movement monitoring is required.
Designed for critical power generation and industrial environments, this transducer assembly provides dependable performance for detecting abnormal casing expansion, restricted movement, and potential rotor-to-stator alignment issues before they affect equipment reliability.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 24765-01-01 |
| Product Type | Case Expansion Transducer Assembly |
| Measurement Technology | DC LVDT (Linear Variable Differential Transformer) |
| Application | Turbine Case Expansion Monitoring |
| Linear Range | 25.4 mm (1.00 in) |
| Measurement Range | ±12.7 mm (±0.5 in) |
| Spring Return | Included |
| Input Power | +24 VDC, 30 mA minimum |
| Electrical Scale Factor | 0.346 V/mm (8.79 V/in) |
| Minimum Load Resistance | 50 kΩ |
| Linearity | ±0.5% Full Scale |
| Frequency Response | 20 Hz (-3 dB) |
| Operating Temperature | -18°C to +71°C |
| Storage Temperature | -54°C to +93°C |
| Enclosure Type | Weatherproof Protective Housing |
| Dimensions | Approx. 241 × 117 × 89 mm |
| Weight | Approx. 2.3 kg |
Industrial Applications
The 24765-01-01 Case Expansion Transducer Assembly is primarily designed for applications where accurate monitoring of machine casing movement is required.
Typical applications include:
-
Steam turbine thermal expansion monitoring
-
Turbine supervisory instrumentation (TSI) systems
-
Combined cycle power generation equipment
-
Large industrial turbine monitoring
-
Generator and turbine alignment systems
-
Rotating machinery protection applications
-
Power plant startup monitoring systems
-
Critical mechanical asset condition monitoring
The device is typically installed between the turbine casing and foundation reference point to measure relative casing growth during temperature changes and operating conditions.
Technical FAQs
1. What is the main function of the Bently Nevada 24765-01-01?
The 24765-01-01 measures thermal expansion of turbine casings relative to the machine foundation, providing important position 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 detect 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 (1.00 inch) linear range, corresponding to approximately ±12.7 mm (±0.5 inch) measurement capability.
4. What does the “01” suffix represent?
The final “01” indicates the assembly includes a spring return option, while the standard 24765 configuration without spring return uses the “00” option.
5. What power supply is required?
The assembly requires a +24 VDC supply with a minimum current of 30 mA for operation.
6. Why is case expansion monitoring important?
Monitoring casing expansion helps identify uneven thermal growth between turbine components, which can lead to mechanical stress, alignment issues, or rotor-to-stator contact.
7. Can this transducer be used with Bently Nevada monitoring systems?
Yes. The 24765 series is designed for integration with compatible Bently Nevada turbine monitoring systems for position measurement and alarm functions.
8. What type of equipment commonly uses this assembly?
It is commonly used on steam turbines, large generators, and other rotating machinery where casing movement monitoring is required.
9. What is the advantage of the spring return design?
The spring return mechanism maintains consistent mechanical engagement with the monitored component, helping improve measurement stability during changing operating conditions.
10. Why choose the Bently Nevada 24765-01-01?
The combination of LVDT accuracy, rugged industrial construction, and dedicated turbine expansion monitoring capability makes it a dependable solution for protecting high-value rotating machinery.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
