{"product_id":"24765-03-01-bently-nevada-case-expansion-transducer-assembly","title":"24765-03-01 Bently Nevada Case Expansion Transducer Assembly","description":"\u003ch3\u003eBently Nevada 24765 Case Expansion Transducer Assembly (DC)\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada\u003c\/strong\u003e \u003cstrong\u003e24765-03-01\u003c\/strong\u003e is a precision direct-current LVDT-based case expansion transducer assembly designed to measure thermal growth and differential expansion on large steam turbines. This rugged measurement system translates mechanical casing displacement into a reliable DC voltage signal for turbine supervisory instrumentation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Model\u003c\/strong\u003e: \u003cstrong\u003e24765\u003c\/strong\u003e – DC Case Expansion Transducer Assembly Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear Range Option\u003c\/strong\u003e: \u003cstrong\u003e-03\u003c\/strong\u003e – 101.6 mm (4.00 in) extended linear measurement range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Option\u003c\/strong\u003e: \u003cstrong\u003e-01\u003c\/strong\u003e – Integrated spring return mechanism for positive plunger contact\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngineering Specification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand \u0026amp; Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eBently Nevada\u003c\/strong\u003e \u003cstrong\u003e24765-03-01\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Power Requirements\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+24 Vdc, 30 mA minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eScale Factor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.143 V\/mm (3.63 V\/in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLinear Range \u0026amp; Linearity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e101.6 mm (4.00 in); Linearity ±0.5% full-range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-3 dB frequency at 10 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal Output \u0026amp; Ripple\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput ripple \u0026lt;1% full scale; Dynamic impedance stabilized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction Materials\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSeries 400 magnetic stainless steel body; Laminated glass epoxy coil form\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePhysical Dimensions \u0026amp; Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeight: 88.9 mm (3.50 in); Width: 117 mm (4.60 in); Weight: 2.3 kg (5.0 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSelection Comparison \u0026amp; Technical Guidance\u003c\/h3\u003e\n\u003cp\u003eWhen selecting case expansion monitors within the \u003cstrong\u003e24765\u003c\/strong\u003e family, matching the stroke length and spring return configuration to your turbine thermal growth profile is critical. Below is a technical comparison with a related variant:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Comparison\u003c\/strong\u003e: Compare against the alternative variant \u003cstrong\u003e24765-02-01\u003c\/strong\u003e. While both units incorporate a spring return mechanism (\u003ccode\u003e-01\u003c\/code\u003e), the \u003ccode\u003e-02\u003c\/code\u003e variant provides a shorter linear range of 50.8 mm (2.00 in) with a higher scale factor of 0.404 V\/mm (10.25 V\/in) and a longer physical length of 328 mm, whereas the \u003cstrong\u003e24765-03-01\u003c\/strong\u003e is engineered for larger thermal expansions requiring the full 101.6 mm (4.00 in) stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelection Advice\u003c\/strong\u003e: Calculate your turbine casing's maximum anticipated thermal growth during cold-to-hot transitions. If expected expansion exceeds 50 mm, select the \u003cstrong\u003e24765-03-01\u003c\/strong\u003e to prevent core saturation or plunger bottoming out.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guide \u0026amp; Mounting Best Practices\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSecure the transducer mounting foot rigidly to the turbine foundation or reference bracket using the 1\/4-20 UNC-2A machine end.\u003c\/li\u003e\n\u003cli\u003eConnect the plunger tip securely to the turbine casing attachment point using the 6-40 UNF-2B core end thread.\u003c\/li\u003e\n\u003cli\u003eEnsure the spring return mechanism maintains smooth, binding-free linear travel across the full 101.6 mm stroke without lateral side-loading.\u003c\/li\u003e\n\u003cli\u003eShield and ground the 25 AWG Teflon-insulated lead wires properly to prevent electrical noise induction from nearby heavy-duty actuators.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Equipment \u0026amp; Application Scenarios\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge Steam Turbines\u003c\/strong\u003e: Monitoring high-pressure and intermediate-pressure cylinder thermal expansion relative to the foundation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas Turbines\u003c\/strong\u003e: Tracking axial casing growth during rapid startup and shutdown cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Compressors\u003c\/strong\u003e: Measuring structural frame displacement under high operating temperatures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostic Capabilities \u0026amp; Maintenance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe 10 Hz frequency response filters out high-frequency mechanical dither while capturing true thermal growth trends.\u003c\/li\u003e\n\u003cli\u003eBuilt-in spring return architecture ensures positive continuous contact with the moving casing, eliminating lost motion errors.\u003c\/li\u003e\n\u003cli\u003eRugged Series 400 magnetic stainless steel body resists corrosive steam environment degradation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePackaging, Warranty \u0026amp; Shipping\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage List\u003c\/strong\u003e: 1 x \u003cstrong\u003eBently Nevada\u003c\/strong\u003e \u003cstrong\u003e24765-03-01\u003c\/strong\u003e Case Expansion Transducer Assembly unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty\u003c\/strong\u003e: Backed by a comprehensive 12-month quality assurance warranty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLogistics\u003c\/strong\u003e: Rapid 24-48 hour dispatch via \u003cstrong\u003eFedex\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuying Guide \u0026amp; Selection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that your monitoring rack supplies a stable +24 Vdc excitation voltage capable of handling at least 30 mA per transducer channel.\u003c\/li\u003e\n\u003cli\u003eCheck physical clearance dimensions around the turbine bearing pedestal to accommodate the 117 mm width and 88.9 mm height profile.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion\u003c\/strong\u003e\u003cbr\u003eWhat is the total linear measuring range of the \u003cstrong\u003e24765-03-01\u003c\/strong\u003e transducer?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnswer\u003c\/strong\u003e\u003cbr\u003eThe \u003ccode\u003e-03\u003c\/code\u003e configuration provides an extended linear measurement range of 101.6 mm (4.00 in).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion\u003c\/strong\u003e\u003cbr\u003eWhat purpose does the \u003ccode\u003e-01\u003c\/code\u003e spring option serve in this assembly?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnswer\u003c\/strong\u003e\u003cbr\u003eThe \u003ccode\u003e-01\u003c\/code\u003e suffix indicates an integrated spring return mechanism that maintains continuous mechanical contact between the plunger and the expanding turbine casing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion\u003c\/strong\u003e\u003cbr\u003eWhat power supply is required to excite this DC LVDT assembly?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnswer\u003c\/strong\u003e\u003cbr\u003eIt requires an input power source of +24 Vdc with a current capacity of at least 30 mA.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion\u003c\/strong\u003e\u003cbr\u003eWhat are the environmental operating temperature limits for the unit?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnswer\u003c\/strong\u003e\u003cbr\u003eThe operating temperature range spans from -18°C to +71°C (0°F to +160°F), with environmental limits extending up to +85°C.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion\u003c\/strong\u003e\u003cbr\u003eHow is the transducer connected mechanically to the turbine casing?\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnswer\u003c\/strong\u003e\u003cbr\u003eIt features a 6-40 UNF-2B thread on the core end for the plunger attachment and a 1\/4-20 UNC-2A thread on the machine end for the body bracket.\u003c\/p\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eGlobal PLC Spare HUB's Insight reveals that erratic jumps in case expansion readings during turbine load changes are frequently caused by mechanical binding of the LVDT core rather than electrical faults. If the mounting bracket shifts slightly due to thermal gradients, side-load forces are transmitted directly to the 6-40 UNF plunger tip, causing premature wear on the internal coil form. Field engineers must use alignment gauges during initial installation to ensure the transducer body and moving plunger remain perfectly axial throughout the complete thermal expansion stroke.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":45013941420214,"sku":"24765-03-01","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/24765-03-01_2.webp?v=1787037093","url":"https:\/\/www.plcsparehub.com\/products\/24765-03-01-bently-nevada-case-expansion-transducer-assembly","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}