135613-01-01 Bently Nevada High Temperature Series DC Expansion Transducer

135613-01-01 | Bently Nevada High Temperature Case Expansion Transducer Assembly (DC)

The Bently Nevada 135613-01-01 is a DC-powered case expansion transducer assembly designed to measure relative mechanical displacement in high-temperature machinery monitoring applications. It converts linear movement into a proportional DC voltage signal for compatible monitoring and control systems.

With a 25.4 mm (1.00 in) linear measurement range and a scale factor of 0.20 V/mm (5.0 V/in), this assembly supports case expansion monitoring on large rotating equipment. Its spring-return configuration provides a defined mechanical return arrangement, while the high-temperature design supports operating environments from -25°C to +85°C.

The assembly is suitable for machinery applications where thermal growth and casing movement require continuous measurement. Typical engineering considerations include sensor alignment, mechanical travel, reference position, and signal scaling.

CONFIGURATION BLUEPRINT | Ordering Code Breakdown

Complete Ordering Number: 135613-01-01

Configuration hierarchy:

• 135613
  • Product family: High Temperature Case Expansion Transducer Assembly
  • Signal type: DC output
  • Application: Machinery case expansion measurement
• First suffix -01
  • Measurement travel: 25.4 mm (1.00 in)
  • Rod length: 127 mm (5.00 in)
• Second suffix -01
  • Mechanical return: Spring return

When ordering a replacement, match both suffixes. The linear travel and spring-return configuration directly affect mechanical installation and measurement setup.

MEASUREMENT SYSTEM | Electrical and Displacement Characteristics

The transducer provides a nominal output scale of 0.20 V for each millimeter of displacement. Across the specified 25.4 mm travel, the corresponding voltage span is 5 V, consistent with the stated +1 to +6 VDC output range.

The output is suitable for displacement monitoring when the receiving system supports the required DC input range and scaling. Engineers should verify the monitor input configuration and displacement direction before commissioning.

MECHANICAL ASSEMBLY | Dimensions and Mounting

Installation requires adequate mechanical clearance for the complete assembly and its moving components. Confirm the available travel, mounting orientation, rod alignment, and reference position before fixing the transducer to the machine.

THERMAL & ENVIRONMENTAL OPERATING ENVELOPE

The operating temperature rating defines the specified working environment. The higher storage temperature limit applies to storage conditions and should not be treated as a continuous operating rating.

APPLICATION ENGINEERING | Where It Is Used

• Steam turbines: Monitoring casing movement caused by thermal expansion during startup, load changes, and shutdown.
• Gas turbines: Measuring structural displacement associated with temperature changes and operating conditions.
• Large rotating machinery: Tracking mechanical case movement to support condition assessment.
• Thermal growth monitoring: Providing displacement feedback for machinery expansion monitoring systems.
• Plant maintenance: Supporting trend analysis and investigation of abnormal casing movement.

Case expansion measurement helps engineers understand how machine structures move as operating temperatures change. Trend data can support the evaluation of thermal growth, mechanical restraint, and potential alignment issues.

INSTALLATION ENGINEERING | Commissioning Procedure

1. Verify the mounting arrangement. Confirm the 127 mm rod option, machine-end thread, available mounting space, and mechanical attachment points.
2. Check the measurement direction. Establish the reference position and determine the expected direction of case movement.
3. Align the moving assembly. Prevent side loading, binding, and unnecessary friction throughout the intended travel.
4. Verify the supply voltage. Provide an unregulated +13.5 to +26 VDC supply and confirm adequate current capacity.
5. Check the DC output. Confirm that the receiving instrument can accept the +1 to +6 VDC output range.
6. Configure signal scaling. Apply the specified 0.20 V/mm scale factor in the monitoring system.
7. Perform a movement test. Check output direction, signal stability, and mechanical travel before placing the machine into normal operation.

During troubleshooting, inspect mechanical binding and mounting alignment before replacing the electrical assembly. An incorrect reference position can also create misleading displacement readings even when the transducer operates correctly.

ACCURACY & SIGNAL INTERPRETATION

The scale factor provides a direct relationship between displacement and voltage change. The following examples illustrate the nominal conversion:

The specified output range is +1 to +6 VDC over a 25.4 mm linear range. The scale factor is a nominal rounded value. Use the manufacturer's calibration data and actual transfer characteristics for final engineering calculations.

COMPLIANCE & REGULATORY INFORMATION

FCC Part 15 operation is subject to two conditions: the device must not cause harmful interference, and it must accept received interference, including interference that may cause undesired operation.

REPLACEMENT SELECTION | Engineering Compatibility Checklist

• Confirm the complete model number: 135613-01-01.
• Match the 25.4 mm linear range and 127 mm rod configuration.
• Verify spring-return mechanical operation.
• Check the +13.5 to +26 VDC power supply requirement.
• Confirm the receiving monitor accepts the +1 to +6 VDC output.
• Verify the 0.20 V/mm scaling and required displacement direction.
• Compare mounting threads, body dimensions, and available mechanical clearance.
• Check the operating temperature and environmental conditions.

For replacement projects, provide the existing transducer part number, installation drawing, and monitor input details. This helps reduce the risk of mechanical mismatch or incorrect signal scaling.

GLOBAL PLC SPARE HUB | MACHINERY APPLICATION INSIGHT

Case expansion measurement is particularly important during turbine startup and shutdown. Uneven thermal growth between the casing, foundation, and connected components can affect clearances and mechanical alignment.

For the 135613-01-01, the 0.20 V/mm scale factor makes the output straightforward to interpret. However, engineers should distinguish the sensor's electrical output from the actual machine displacement reference. The mechanical null position, rod installation, and monitor scaling must all be established correctly.

The spring-return option is also a key selection detail. Confirm that the installed mechanical arrangement provides the required contact and travel behavior throughout the operating cycle. Never assume that a similar DC output transducer has the same mechanical return characteristics.

SUPPLY, PACKAGING & WARRANTY

Contact Global PLC Spare HUB for pricing, stock availability, and technical assistance. Include the complete model number and application details when requesting a quotation.

FREQUENTLY ASKED QUESTIONS

Q1. How do I determine whether a 25.4 mm measurement range is sufficient for my turbine?

Review the maximum expected casing movement during startup, steady operation, load changes, and shutdown. Include installation tolerance and mechanical reference-position allowance. The expected movement must remain within the specified linear range, with adequate margin at both ends.

Q2. Can this assembly connect directly to any PLC analog input?

Not necessarily. The input must accept the +1 to +6 VDC signal range and provide compatible signal conditioning. Check input impedance, isolation, grounding, resolution, and scaling before connecting the transducer. A 4–20 mA-only input requires an appropriate signal conversion solution.

Q3. What symptoms may indicate incorrect mechanical alignment?

Common symptoms include irregular output changes, restricted movement, inconsistent readings during thermal cycles, or a failure to return to the expected reference position. Inspect the rod, mounting points, and mechanical travel before assuming an electrical fault.

Q4. How should I interpret the 200 Hz frequency specification for a case expansion application?

The -3 dB frequency is a dynamic response characteristic, not a recommended casing movement frequency. Case expansion usually involves relatively slow thermal movement. The bandwidth indicates the transducer's response capability, while the actual monitoring setup should reflect the machine's expected displacement behavior.

Q5. What information should I provide when purchasing a replacement assembly?

Provide the complete part number, existing rod length, measurement range, spring-return requirement, mounting dimensions, supply voltage, and receiving monitor model. If possible, include photographs or an installation drawing. This allows the mounting and electrical configuration to be checked before shipment.

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