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

• Brand: Bently Nevada
• Full Model Number: 24765-02-01
• Lifecycle Status: Legacy / Lifecycle-managed
• Core Function: DC case expansion transducer assembly for turbine supervisory instrumentation
• Top 3 Technical Specs: 50.8 mm (2.00 in) linear range; 0.404 V/mm (10.25 V/in) scale factor; 15 Hz −3 dB frequency response
• Stock & Condition: New Surplus / Tested Refurbished; Physical stock confirmation required; Emergency dispatch subject to order cutoff

The 24765-02-01 is identified as a Bently Nevada Case Expansion Transducer Assembly (DC). Its ordering code specifies 02 = 50.8 mm (2.00 in) linear range and 01 = spring return. Published technical data gives a 0.404 V/mm (10.25 V/in) electrical scale factor and 15 Hz −3 dB frequency response.

Module 3: Obsolescence & Supply Chain Deep Dive

A failed case-expansion transducer can compromise turbine startup and thermal-growth monitoring even when the rest of the machinery-protection system remains available. The Bently Nevada 24765-02-01 is an LVDT-based case-expansion assembly used to measure linear movement associated with turbine casing thermal growth. The exact configuration is significant: this version provides a 50.8 mm total electrical linear range with spring return, rather than being a generic displacement sensor.

The TCO case favors an exact replacement when the existing mounting arrangement, signal-conditioning hardware, and turbine supervisory instrumentation remain serviceable. Keeping the installed transducer architecture can avoid mechanical redesign, alternative sensor qualification, wiring changes, and renewed turbine commissioning. That matters during outage work, where engineering and installation labor can exceed the component cost. One important procurement note: published supplier data lists lead times ranging from 5–7 days for reported stocked material to 8–16 weeks for factory-order conditions, so physical inventory confirmation is essential for outage planning.

Module 4: Compatibility & Replacement Matrix

Field Traps — Watch Out

• Range mismatch: The “-02-” ordering option corresponds to the 2.00-inch / 50.8 mm linear range. A different 24765 configuration may have a different measurement span and therefore require different calibration or scaling.
• Spring-return and mechanical installation: The “-01” option specifies spring return. Verify the installed mechanical linkage, travel direction, mounting geometry, and return force before approving a replacement. A sensor with different mechanical behavior can produce an incorrect zero or limited travel even when its electrical output appears normal.

Bently Nevada 24765-02-01

Module 5: Quality Assurance & Testing SOP

This assembly should be treated as a precision displacement-measurement device, with mechanical and electrical verification performed before shipment.

• Incoming traceability: Record Bently Nevada identification, complete 24765-02-01 part number, serial/lot information, configuration markings, and available date-code data.
• OEM anti-counterfeit visual inspection: Inspect manufacturer markings, housing, labels, wiring, connector/terminal arrangement, mechanical finish, and evidence of unauthorized repair.
• Dimensional inspection: Verify approximately 24.1 cm × 11.7 cm × 8.89 cm overall dimensions where applicable to the supplied assembly.
• Mechanical integrity check: Inspect mounting points, actuator/linkage components, spring-return mechanism, housing, and cable/lead condition.
• Power-on verification: Apply the specified excitation under controlled laboratory conditions and check current draw and output behavior.
• LVDT continuity test: Verify winding/lead continuity and absence of unintended shorts.
• Insulation check: Verify applicable insulation resistance using an approved low-energy test procedure.
• Stroke test: Exercise the transducer through representative linear travel and verify smooth mechanical response.
• Scale-factor verification: Confirm the expected 0.404 V/mm (10.25 V/in) output relationship within the applicable calibrated range.
• Range verification: Confirm the full 50.8 mm electrical travel and identify both endpoints.
• Spring-return test: Drive the mechanism through representative travel and verify consistent return to the defined reference position.
• Frequency-response check: Where laboratory equipment permits, verify the low-frequency response characteristics against the specified 15 Hz −3 dB point.
• Signal stability test: Monitor output under fixed displacement and check for drift, noise, hysteresis, or intermittent discontinuities.
• Final QC release: Record measured travel, scale factor, spring-return behavior, electrical results, photographs, test date, and technician approval.

Module 6: Procurement & Lifecycle FAQ

1. Is the Bently Nevada 24765-02-01 genuinely in stock, and what is the cutoff for emergency shipping?

Current supplier reports are mixed. Some listings identify the exact 24765-02-01 as in stock, while others quote approximately 8–16 weeks for supply. For an emergency requirement, physical warehouse confirmation should include quantity, exact ordering code, current photographs, condition, and dispatch cutoff before the PO is released.

2. How do you guarantee the condition and authenticity of this obsolete or surplus transducer?

Verification should begin with the complete 24765-02-01 identification and inspection of the housing, mechanical assembly, spring-return mechanism, labels, wiring, and mounting features. Functional testing should then verify continuity, linear travel, output scale factor, endpoint behavior, and return-to-zero performance. Keep the test record with the asset receiving documentation.

3. Are there any firmware compatibility issues I should warn my engineers about before issuing the PO?

No conventional firmware issue applies to the transducer itself. The engineering concern is measurement-chain compatibility: confirm the LVDT excitation, signal-conditioning input, scaling, travel range, mounting geometry, and installed TSI configuration. The 24765-02-01 uses a 0.404 V/mm (10.25 V/in) scale factor and a 50.8 mm electrical range, so the receiving instrumentation must be configured accordingly.

4. Can the 24765-02-01 replace the existing case-expansion transducer without hardware modification?

For an existing installation using the same 2.00-inch, spring-return DC LVDT configuration, a like-for-like replacement is normally intended to preserve the existing system arrangement. Mechanical linkage, mounting position, travel direction, and signal scaling must still be checked during commissioning.

5. What warranty and return terms should procurement require?

The PO should specify Bently Nevada 24765-02-01, exact configuration, condition, test status, warranty duration, and return procedure. Warranty coverage should address DOA and verified transducer or mechanical defects while excluding damage caused by incorrect mounting, excessive mechanical travel, improper excitation, wiring faults, linkage damage, or unauthorized modification.