Bently Nevada 135613-01 Case Expansion Transducer Assembly

Overview

The Bently Nevada 135613-01 is a high-temperature case expansion transducer assembly. It monitors thermal growth in large rotating machinery, such as turbines. The system uses DC-LVDT technology to measure casing expansion during startup and operation. Engineers rely on it to detect misalignment or abnormal thermal behavior. This helps prevent mechanical damage and improves machine reliability.

Technical Specifications

Measurement Principle:

• DC-LVDT (Linear Variable Differential Transformer)

Electrical Scale Factor (varies by model):

• 0.346 V/mm (8.79 V/in)
• 0.404 V/mm (10.25 V/in)
• 0.143 V/mm (3.63 V/in)

Frequency Response:

• 10 Hz to 20 Hz depending on the model

Accuracy and Stability:

• Linearity: ±0.5% of full range
• Non-Linearity: < 0.25% of full scale
• Stability: 0.125% of full scale
• Temperature Coefficient: 0.05%/°C (0.028%/°F) max

Electrical Characteristics:

• Input Power: +24 VDC, 30 mA minimum
• Output Impedance: 7 kΩ nominal

Environmental Ratings:

• Operating Temp: –25°C to +85°C (–13°F to +185°F)
• Storage Temp: –55°C to +125°C (–67°F to +257°F)
• Weatherproofing: TYPE 4 enclosure

Construction Materials:

• Probe Tip: Polyphenylene sulfide (PPS)
• Probe Case: AISI 303/304 stainless steel
• Sensor Housing: A308 aluminum
• Connector: Gold-plated brass or beryllium copper

Physical Dimensions:

• Height: 88.9 mm
• Width: 117 mm
• Length: 241 mm
• Weight: 2.3 kg