{"product_id":"bently-nevada-3500-45-differential-expansion-monitor","title":"Bently Nevada 3500\/45 Differential Expansion Monitor","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBently Nevada 3500\/45\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Part Number\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e176449-04\u003c\/strong\u003e) serves as a 4-channel high-integrity position monitor within the 3500 Machinery Protection System. This module executes continuous measurement of critical rotor and casing position parameters, including axial thrust, differential expansion, and valve position. It accepts a wide array of transducer inputs—from proximity probes to AC\/DC LVDTs and rotary potentiometers—converting these signals into deterministic alarm and trip outputs. We supply this module as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your steam turbines and gas turbines maintain API 670-compliant protection against catastrophic axial contact or thermal expansion damage.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 3500\/45 module utilizes 4 independent channels, each programmable for specific measurement types to match the machinery's mechanical requirements.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3500\/45 (176449-04)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMonitor Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePosition \/ Displacement Monitor\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Channels\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Independent Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Compatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eProximity Probes, RPTs, AC\/DC LVDTs, Potentiometers\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMeasurement Types\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAxial (Thrust) Position, Differential Expansion (Single\/Dual Ramp)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eA\/D Resolution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24-bit High Precision\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e–30°C to +65°C (–22°F to +149°F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 Vrms Galvanic Isolation\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3500 Rack Configuration Software\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.8 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUniversal Transducer Interface:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 3500\/45 simplifies hardware inventory by interfacing with multiple sensor technologies. Whether your application requires LVDTs for steam valve position or proximity probes for axial thrust monitoring, this module conditions all signals through a single hardware platform.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDeterministic Axial Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module processes all trip logic locally. This ensures that a \"Danger\" relay triggers within milliseconds of an axial thrust violation, preventing rotor-to-stator contact during sudden load changes or surge events.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eComplex Expansion Modeling:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIt supports non-standard and dual-ramp differential expansion measurements. This capability allows the monitor to accurately track thermal growth in large steam turbines where casing and rotor expansion rates differ significantly during startup.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eContinuous Transducer OK Diagnostics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module constantly monitors the bias voltage and signal integrity of all connected field sensors. It distinguishes between a genuine machinery position alarm and a failed LVDT or probe, eliminating nuisance trips and enhancing system availability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSeamless 3500 Rack Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 3500\/45 communicates real-time position data and alarm status across the backplane to the 3500\/22 TDI or 3500\/92 Communications Gateway, facilitating centralized monitoring in DCS and SCADA systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between axial thrust and differential expansion monitoring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAxial thrust monitoring measures the shaft's position relative to the thrust bearing (critical for preventing internal contact), while differential expansion monitors the relative thermal growth between the rotor and the machine casing during thermal transients.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use AC and DC LVDTs on the same 3500\/45 module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 3500\/45 is highly configurable; however, you must select the correct I\/O module (designed for AC or DC LVDTs) to ensure proper signal conditioning and excitation voltage for the specific transducer type.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require a specific I\/O card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 3500\/45 must be paired with an I\/O module that matches your field sensors. Different I\/O modules exist for proximity probes, LVDTs, and rotary position transducers. Always verify your termination requirements before installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 176449-04 a direct replacement for older 3500\/45 modules?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 176449-04 is a standard part number for the 3500\/45 series. It integrates seamlessly into existing 3500 racks and works with standard 3500 Rack Configuration Software.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":44083746570339,"sku":"3500\/45","price":460.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/321._70260046-9a73-4482-9dec-ae5230e3bd44.jpg?v=1774600272","url":"https:\/\/www.autocontrolglobal.com\/products\/bently-nevada-3500-45-differential-expansion-monitor","provider":"AutoControl Global","version":"1.0","type":"link"}