24765-02-01 | Bently Nevada Case Expansion Transducer Assembly

Introduction: Solving Turbine Case Expansion Measurement Challenges

When thermal growth of a turbine casing must be tracked with precision, the 24765-02-01 from Bently Nevada provides a reliable solution. This DC-operated case expansion transducer assembly is engineered for continuous monitoring of machinery case expansion, helping operators detect abnormal thermal movement before it leads to mechanical issues.

With a linear range of ±25.4 mm (±1.00 in) and a scale factor of 0.404 V/mm (10.25 V/in), the 24765-02-01 delivers accurate, repeatable measurements. Its robust construction and environmental ratings make it suitable for demanding industrial environments.

Key Features & Technical Specifications

• Scale Factor: 0.404 V/mm (10.25 V/in) for the 24765-02 option.
• Linear Range: ±25.4 mm (±1.00 in) for the 24765-02 option.
• -3 dB Frequency: 15 Hz, suitable for slow thermal expansion monitoring.
• Minimum Load Resistance: 100 kΩ, ensuring compatibility with most readout systems.
• Output Ripple: Less than 1% full scale, providing stable signals.
• Linearity: ±0.5% of full range, ensuring measurement accuracy.
• Stability: 0.125% full-scale, for long-term reliability.
• Scale Factor Temperature Coefficient: 0.07%/°C (0.04%/°F), minimizing drift.
• Operating Temperature: -18 °C to +71 °C (0 °F to +160 °F).
• Storage Temperature: -54 °C to +93 °C (-65 °F to +200 °F).
• Shock Rating: 250 g for 11 ms, robust against mechanical shocks.
• Vibration Rating: 10 g @ 0 to 2 kHz, resistant to vibration.
• Construction: Body made of Series 400 magnetic stainless steel; coil of laminated glass epoxy; lead wire 25 AWG stranded copper, Teflon-insulated, 31 cm (12 in).
• Mechanical Dimensions: Height 88.9 mm (3.50 in), Width 117 mm (4.60 in), Length 241 mm (9.50 in).
• Weight: 2.3 kg (5.0 lbs).
• Thread: 6-40 UNF-2B core end, 1/4-20 UNC-2A machine end.
• Plunger Length: As required for application; refer to dimensional drawings.

Real-World Applications

The 24765-02-01 is primarily used in steam turbines, gas turbines, and large rotating machinery where case expansion monitoring is critical. By tracking thermal growth, operators can prevent casing distortion and maintain proper clearances between rotating and stationary components.

In combined-cycle power plants, this transducer assembly helps optimize startup and shutdown procedures, reducing thermal stress. Additionally, it supports predictive maintenance programs by providing continuous data that can be trended over time.

Installation & Setup

Proper installation is essential for accurate measurements. Mount the transducer assembly securely to the machine casing using the provided threads. Ensure the plunger contacts the reference surface correctly and that the lead wire is routed without sharp bends or strain.

For best results, follow the dimensional drawings and installation guidelines in the official Bently Nevada datasheet. Always verify the output signal polarity and scale factor before commissioning.

Maintenance & Reliability

Regular inspection of the transducer assembly is recommended to ensure reliable operation. Check the mounting integrity, lead wire condition, and plunger movement periodically. Clean the assembly with a dry cloth if necessary, avoiding any solvents that could damage the Teflon insulation.

The 24765-02-01 is designed for long service life, but environmental factors such as extreme temperatures or vibration can affect performance. Monitoring output stability and performing routine calibration checks will help maintain accuracy.

Compatibility & Integration

The 24765-02-01 provides a DC voltage output proportional to displacement, making it compatible with most industrial control systems, data acquisition modules, and vibration monitoring systems. Its 100 kΩ minimum load resistance allows easy interface with standard PLC analog input cards.

For seamless integration, consult the Bently Nevada documentation to ensure proper signal conditioning and scaling. The transducer can be used with Bently Nevada monitors or third-party systems that accept 0-10 VDC or similar analog signals.

Troubleshooting & Common Issues

If the output signal is unstable, check for loose connections or damaged lead wires. Verify that the plunger moves freely and that the mounting bracket is secure. If the scale factor drifts, recalibrate the system using a known displacement reference.

For persistent issues, consult the official Bently Nevada troubleshooting guide or contact Petro Auto Tech for technical support. Do not attempt to disassemble the transducer; it is a sealed assembly.

FAQ

Q: What is the linear range of the 24765-02-01?

A: The linear range is ±25.4 mm (±1.00 in) for the 24765-02 option.

Q: What is the scale factor of the 24765-02-01?

A: The scale factor is 0.404 V/mm (10.25 V/in).

Q: What is the -3 dB frequency of the 24765-02-01?

A: The -3 dB frequency is 15 Hz.

Q: What is the operating temperature range?

A: The operating temperature range is -18 °C to +71 °C (0 °F to +160 °F).

Q: What is the minimum load resistance?

A: The minimum load resistance is 100 kΩ.

Product Support & Availability

Petro Auto Tech offers the Bently Nevada 24765-02-01 case expansion transducer assembly. Contact our team for current availability, pricing, and delivery options. We are committed to providing genuine industrial automation parts with reliable support.