{"product_id":"bently-nevada-139554-01-3500-45-ac-lvdt-position-i-o-module","title":"Bently Nevada 139554-01 3500\/45 AC LVDT Position I\/O Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 139554-01\u003c\/strong\u003e is an AC LVDT position I\/O module with internal terminations designed for machinery position monitoring and protection applications. Installed in a full-height rear slot of a Bently Nevada 3500 system rack, the module routes input signals from AC Linear Variable Differential Transformers (AC LVDTs) directly to the \u003cstrong\u003e3500\/45\u003c\/strong\u003e Position Monitor main board. It provides continuous transducer excitation using a 2.3 Vrms, 3400 Hz sine wave signal and supports key parameters including Case Expansion and Valve Position measurements. Process interfaces feature +4 to +20 mA recorder current outputs for local control integration and dedicated inhibit control inputs.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAccepts up to 4 AC LVDT transducer signal inputs via internal terminal connections.\u003c\/li\u003e\n\u003cli\u003eProvides a dedicated 2.3 Vrms, 3400 Hz sine wave transducer excitation power supply.\u003c\/li\u003e\n\u003cli\u003eFeatures +4 to +20 mA proportional current outputs for recorder data transmission.\u003c\/li\u003e\n\u003cli\u003eIncludes hardware inhibit (INHB) and return terminal pins for remote function control.\u003c\/li\u003e\n\u003cli\u003eIntegrates internal screw-terminal headers directly on the rear module interface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCase expansion monitoring on steam turbine casings.\u003c\/li\u003e\n\u003cli\u003eValve position monitoring for process inlet valve stems and governor control valves.\u003c\/li\u003e\n\u003cli\u003eContinuous position tracking in rotating machinery protection systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Number \/ Option\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3500\/45-AA-BB\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePosition Monitor\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOption A: 05\u003c\/td\u003e\n\u003ctd\u003eAC LVDT Position I\/O Module with Internal Terminations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpares\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e139554-01\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eAC LVDT Position I\/O Module with Internal Terminations for use with AC LVDTs\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e139554-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eAC LVDT Position I\/O Module with Internal Terminations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Main Module\u003c\/td\u003e\n\u003ctd\u003e3500\/45 Position Monitor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003eAccepts 1 to 4 signal inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e137 kOhm (AC LVDT inputs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransducer Power Supply\u003c\/td\u003e\n\u003ctd\u003e2.3 Vrms, 3400 Hz sine wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Power Consumption\u003c\/td\u003e\n\u003ctd\u003e8.5 Watts typical (using AC LVDT I\/O)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecorder Outputs\u003c\/td\u003e\n\u003ctd\u003e+4 to +20 mA (proportional to full-scale)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Compliance\u003c\/td\u003e\n\u003ctd\u003e0 to +12 Vdc across load (Load resistance: 0 to 600 Ohm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-30 degC to +65 degC (-22 degF to +150 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 degC to +85 degC (-40 degF to +185 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Humidity\u003c\/td\u003e\n\u003ctd\u003e95% Non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H x W x D)\u003c\/td\u003e\n\u003ctd\u003e241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.20 kg (0.44 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRack Space Requirements\u003c\/td\u003e\n\u003ctd\u003e1 full-height rear slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTerminal Pin\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCH1 LVDT (1, 2, 3, 4, 5, 6, SHLD)\u003c\/td\u003e\n\u003ctd\u003eChannel 1 AC LVDT Input and Shield Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCH2 LVDT (1, 2, 3, 4, 5, 6, SHLD)\u003c\/td\u003e\n\u003ctd\u003eChannel 2 AC LVDT Input and Shield Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCH3 LVDT (1, 2, 3, 4, 5, 6, SHLD)\u003c\/td\u003e\n\u003ctd\u003eChannel 3 AC LVDT Input and Shield Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCH4 LVDT (1, 2, 3, 4, 5, 6, SHLD)\u003c\/td\u003e\n\u003ctd\u003eChannel 4 AC LVDT Input and Shield Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eINHB\u003c\/td\u003e\n\u003ctd\u003eInhibit Control Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRET\u003c\/td\u003e\n\u003ctd\u003eReturn Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOM\u003c\/td\u003e\n\u003ctd\u003eCommon Reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREC1\u003c\/td\u003e\n\u003ctd\u003eChannel 1 Recorder Current Output (+4 to +20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREC2\u003c\/td\u003e\n\u003ctd\u003eChannel 2 Recorder Current Output (+4 to +20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREC3\u003c\/td\u003e\n\u003ctd\u003eChannel 3 Recorder Current Output (+4 to +20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREC4\u003c\/td\u003e\n\u003ctd\u003eChannel 4 Recorder Current Output (+4 to +20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSHIELD\u003c\/td\u003e\n\u003ctd\u003eSystem Chassis Ground Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module into the full-height rear slot directly behind the 3500\/45 Position Monitor main board.\u003c\/li\u003e\n\u003cli\u003eSecure the top and bottom captive screws to maintain proper chassis ground and mechanical integrity.\u003c\/li\u003e\n\u003cli\u003eRoute transducer signal cables through internal terminal blocks with appropriate strain relief.\u003c\/li\u003e\n\u003cli\u003eConnect shield wires directly to designated SHLD terminal points to minimize electromagnetic noise interference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEMC Directives: European Community Directive 2014\/30\/EU; EN 61000-6-2, EN 61000-6-4\u003c\/li\u003e\n\u003cli\u003eElectrical Safety: European Community Directive 2014\/35\/EU; EN 61010-1\u003c\/li\u003e\n\u003cli\u003eRoHS Directives: European Community ROHS Directive 2011\/65\/EU; China RoHS SJ\/T 11364-2024 (EFUP 15 years)\u003c\/li\u003e\n\u003cli\u003eMaritime Approvals: DNV GL rules for classification; ABS Rules for Condition of Classification\u003c\/li\u003e\n\u003cli\u003eHazardous Area Approvals: cNRTLus Class I, Zone 2 \/ Class I, Division 2, Groups A, B, C, D (T4 @ Ta = -20 degC to +65 degC); ATEX\/IECEx Ex nA nC ic IIC T4 Gc \/ Ex ec nC ic IIC T4 Gc\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666767147371,"sku":"139554-01","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-139554-01-lvdt-position-i-o-module-fagye0bi2in_151afe44-c8ef-487a-864e-a372b314383c.jpg?v=1765447223","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-139554-01-3500-45-ac-lvdt-position-i-o-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}