135613-01-00 Bently Nevada Case Expansion Transducer Assembly

Product Overview

The 135613-01-00 is a high-temperature DC-powered Case Expansion Transducer Assembly engineered by Bently Nevada for heavy-duty turbo-machinery monitoring. This high-precision sensor monitors the relative thermal growth of a machine casing relative to its structural foundation. Operating on a stable DC voltage interface, the assembly delivers real-time position measurements to prevent binding, structural deformation, or critical clearance losses during thermal transitions.

Designed to survive severe industrial environments, the 135613-01-00 converts physical displacement into a highly linear +1 to +6 Vdc analog output signal. The internal sensor architecture features an optimized 0.20 V/mm scale factor operating over a 25.4 mm measurement envelope. It relies on robust internal components that maintain measurement repeatability despite continuous heat exposure, physical vibration, and aggressive industrial background noise.

Global PLC Spare HUB's Insight

Turbine instrumentation engineers specify the 135613-01-00 due to its structural linearity and exceptional mechanical endurance. Large steam and gas turbines generate extreme ambient heat that can induce massive thermal drift in standard linear displacement sensors. This Bently Nevada assembly limits non-linearity to less than 0.25% of full scale while managing a temperature coefficient of 0.05%/°C maximum. This high thermal stability ensures that structural tracking data remains accurate across severe heat cycles, allowing plant operators to execute cold start profiles without risking false displacement alarms.

Technical Specifications

• Brand: Bently Nevada
• Model: 135613-01-00
• Product Type: High Temperature Case Expansion Transducer Assembly (DC)
• Input Power Requirement: +13.5 to +26 Vdc unregulated, 30 mA minimum current draw
• Analog Output Voltage Range: +1 to +6 Vdc linear output across all models
• Linear Measurement Range: 25.4 mm (1.00 inch) continuous stroke
• Scale Factor Sensitivity: 0.20 V/mm (5.0 V/inch) constant output slope
• Frequency Response (-3 dB): 200 Hz typical dynamic tracking band
• Measurement Stability: 0.125% full-scale retention
• Non-Linearity Metric: Less than 0.25% full-scale deviation
• Temperature Coefficient Rate: Maximum 0.05%/°C (0.028%/°F) thermal shift limit
• Output Noise Baseline: Less than 10 mV peak-to-peak residual noise
• Operating Temperature Limits: -25 °C to +85 °C (-13 °F to +185 °F) operational ambient
• Storage Temperature Envelope: -55 °C to +125 °C (-67 °F to +257 °F) protected storage
• Mechanical Shock Rating: 250 g peak deceleration pulse for 11 ms duration
• Vibration Tolerance: 10 g peak structural acceleration across 0 to 2 kHz spectrum
• Core End Thread Specification: 6-40 UNF-2B precision thread layout
• Machine End Thread Specification: 1/4-20 UNC-2A industrial mount thread
• Physical Net Weight: 2.3 kg (5.0 lbs) structural weight
• Enclosure Outer Dimensions: 88.9 mm Height x 117 mm Width x 241 mm Length (3.50" x 4.60" x 9.50")
• Sensor Body Metrics: 171 mm Length, 19.2 mm Diameter, 65.4 mm from Body End to Null Center
• Internal Core Structural Length: 87.6 mm (3.45 inches) active core length

Configuration Breakdown

The alpha-numeric suffix structure of the 135613-01-00 designates the specific mechanical and physical options integrated into the transducer assembly:

• 135613 - Base Assembly Type: High Temperature Case Expansion Transducer
• 01 - Linear Range Option: 25.4 mm (1.0 inch) active displacement range paired with a 127 mm (5.00 inch) extension rod
• 00 - Spring Mechanism Option: Standard assembly built without a spring return block

Diagnostic Capabilities & Signal Integrity

• Continuous low-noise output monitoring restricts signal ripples under 10 mV to protect signal paths from background EMI.
• Built-in physical null centering design located at exactly 65.4 mm allows for quick installation calibration checks.
• Integrated voltage loop diagnostics detect deviations outside the standard +1 to +6 Vdc operational boundary to identify transducer failures.

Target Equipment & Application Scenarios

• Utility-scale steam turbine generator sets tracking absolute casing expansion relative to the sliding foundation pads.
• Heavy industrial gas turbine shells undergoing severe structural thermal stress during rapid peaking starts.
• Large continuous centrifugal process compressors requiring active growth tracking to prevent housing misalignment.
• High-pressure thermal piping infrastructure requiring continuous displacement checking against structural stress designs.

Procurement & Selection Guidance

• Confirm that your existing machinery layout allows for an external mounting point using standard 1/4-20 UNC-2A machine end threads.
• Verify that your site configuration requires the non-spring return option (00); setups with external linkages prefer this configuration over spring-loaded alternatives.
• Ensure that your monitoring rack or DCS input card is configured to scale an unregulated +13.5 to +26 Vdc supply loop for this transducer type.

Compliance, Certifications & Standards

• FCC Compliance: Evaluated and approved under Part 15 of the FCC interference and radiation rules.
• Electromagnetic Compatibility: Fully certified against EN 61000-6-2 (2005) and EN 61000-6-4 (2007) +A1:2011 industrial rules.
• EMC Directive: Certified compliant with European Union EMC Directive 2014/30/EU standards.
• Environmental Stewardship: Manufactured in full accordance with European RoHS Directive 2011/65/EU guidelines.

Logistics, Packaging & Warranty

• Package Contents: One factory-packed Bently Nevada 135613-01-00 Case Expansion Transducer with an integrated 127 mm rod.
• Warranty Protection: Extended 12-month complete industrial parts and performance warranty assurance.
• Fulfillment Dispatch: Orders are processed, balance-checked, and shipped within 24 to 48 hours from order confirmation.
• Shipping Methods: Global priority air logistics coordinated via premier express carriers including FedEx, UPS, and DHL.

Frequently Asked Questions

Question: What happens to the analog signal if the turbine shell expands completely out of the 25.4 mm range?

Answer: The output voltage will saturate past the normal +6 Vdc limit and lose linearity, indicating to the monitoring system that the physical stroke limit has been breached.

Question: Does this specific "00" suffix assembly contain an internal return spring to push the rod back automatically?

Answer: No, the "00" option represents a configuration without a spring return; the extension rod must be coupled mechanically to the target moving element.

Question: How should a maintenance team approach field calibration for the 0.20 V/mm scale factor?

Answer: Technicians recommend using a precision micrometer fixture to verify voltage outputs at the mechanical null center (65.4 mm) before running full stroke tests.

Question: Can this unit operate reliably on standard unregulated 24VDC instrument loops found in common plant setups?

Answer: Yes, the hardware handles any unregulated input voltage ranging from +13.5 to +26 Vdc while drawing a minimum continuous current of 30 mA.

Question: Why is the 10 g vibration tolerance rating critical for case expansion setups on large turbine frames?

Answer: Turbines experience immense structural vibration during transient critical speed transitions; the 10 g rating guarantees that internal coils will not suffer wire fractures during operation.

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