{"product_id":"bently-nevada-24765-02-00-case-expansion-transducer-assembly","title":"Bently Nevada 24765-02-00 Case Expansion Transducer Assembly","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eFor the continuous tracking of thermal casing growth on large utility steam turbines, the \u003cstrong\u003eBently Nevada 24765-02-00\u003c\/strong\u003e transducer assembly utilizes a direct-current linear variable differential transformer (DC-LVDT) to deliver precise absolute displacement feedback. This heavy-duty system converts physical axial movement into an analog DC voltage, allowing supervisory machinery protection systems to track structural expansion and prevent casing deformation or mechanical binding. By using a DC-powered design, the assembly simplifies the instrument loop by eliminating the need for external AC excitation and demodulator modules, transmitting a scaled signal directly to the control room or monitor rack.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 20px; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003e50.8 mm (2.00 in) Linear Range:\u003c\/strong\u003e Optimized for mid-to-large-scale casing displacement tracking on industrial rotating machinery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWithout Spring Return (Option 00):\u003c\/strong\u003e Requires a rigid mechanical coupling directly to the sliding turbine foot or casing, ensuring the sensor rod follows bi-directional movement without relying on mechanical spring tension.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect-Current Operation:\u003c\/strong\u003e Integrated internal electronics accept DC power and output a clean, low-impedance DC voltage proportional to displacement.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRugged Protective Housing:\u003c\/strong\u003e Constructed to withstand high humidity, oil mist, and thermal cycling common in power generation turbine decks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 20px; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003eSteam turbine thermal casing expansion monitoring.\u003c\/li\u003e\n  \u003cli\u003eGas turbine structural growth tracking.\u003c\/li\u003e\n  \u003cli\u003eBoiler and feed pump foundation displacement measurements.\u003c\/li\u003e\n  \u003cli\u003eHeavy industrial structural expansion and mechanical alignment tracking.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #cbd5e0;\"\u003e\n        \u003cth style=\"padding: 10px; text-align: left; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"padding: 10px; text-align: left; font-weight: bold;\"\u003eSpecification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eBently Nevada\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e24765-02-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eTransducer Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eDirect-Current Case Expansion Transducer (DC-LVDT)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eLinear Range Option\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e02 (50.8 mm \/ 2.00 inches)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eSpring Return Option\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e00 (Without spring return; rigid coupling required)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eScale Factor\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e0.404 V\/mm (10.25 V\/inch) nominal\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eFrequency Response (-3 dB)\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e15 Hz\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e-30 to +100 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eCountry of Origin\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003eUnited States (USA)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eDevice Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e2.3 kg (5.07 lbs)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e3.5 kg (7.71 lbs)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 10px; font-weight: bold;\"\u003ePackage Dimensions (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 10px;\"\u003e24.1 cm x 11.7 cm x 8.9 cm (9.49 in x 4.61 in x 3.50 in)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\n\u003ch3\u003eAlternative Models \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe Bently Nevada 24765-02-00 is directly compatible with the \u003cstrong\u003e3500\/45 Position Monitor\u003c\/strong\u003e or older 3300-series position monitors configured for DC-LVDT inputs. When replacing an older AC-LVDT case expansion assembly, be aware that you must bypass or remove any external AC demodulator units, as the 24765 handles excitation and conditioning internally. Ensure the monitoring system channel card is configured for DC voltage input with the correct scale factor (10.25 V\/in) to avoid erroneous calibration curves.\u003c\/p\u003e\n\n\u003ch3\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eBecause this specific assembly utilizes the \u003cstrong\u003eOption 00 (no spring return)\u003c\/strong\u003e, the sensor core rod does not automatically retract. The rod must be mechanically pinned, bolted, or tethered via a yoke assembly to the turbine casing. If this physical connection is lost or slips during thermal cycling, the transducer will remain in its last physical position, causing the monitoring system to report a static \"flatline\" signal. Additionally, any side loads or angular misalignment during casing movement will cause internal friction, wearing out the PTFE support bushings and creating measurement stiction.\u003c\/p\u003e\n\n\u003ch3\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWhen installing the transducer in cold machinery conditions, adjust the mechanical coupling so that the LVDT core sits near the negative end of its physical stroke. This maximizes the usable positive measurement range as the steam turbine heats up and expands. Ensure the field wiring shield is grounded only at the 3500 monitor rack terminal block; leaving both ends of the shield grounded can create ground loops due to potential differences between the turbine foundation and the control room instrument ground.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 15px; margin-bottom: 1.5rem;\"\u003e\n  \u003cstrong style=\"color: #9b2c2c; display: block; margin-bottom: 5px;\"\u003eCRITICAL WARNING\u003c\/strong\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0;\"\u003eEnsure the turbine is completely shut down, de-energized, and cooled to ambient temperature before attempting installation or physical adjustment of the transducer assembly. Structural casing movements during cooldown present severe crushing hazards. Disconnect all associated monitoring loop power to prevent transient surges from damaging the internal LVDT electronics during wiring.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 10px; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e1\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eMount the heavy protective housing securely to the rigid turbine foundation plate or pedestal, ensuring alignment parallel to the direction of casing growth.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e2\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eMechanically link the LVDT rod end to the casing bracket or sliding foot. Verify that there is zero angular offset or binding across the entire 50.8 mm stroke.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e3\u003c\/div\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eConnect the DC power supply lines and signal output cables inside the integrated junction box, utilizing flexible conduit to isolate the housing from turbine vibrations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668308062571,"sku":"24765-02-00","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/24765-02-00-tdjvqwncz2e_7906ff92-bdd3-464e-aaa3-8afcd4f5c79e.jpg?v=1765520740","url":"https:\/\/www.plcprotech.com\/tr\/products\/bently-nevada-24765-02-00-case-expansion-transducer-assembly","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}