{"product_id":"bently-nevada-3500-50-04-00-3500-series-tachometer-module","title":"Bently Nevada 3500\/50-04-00 3500 Series Tachometer Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eProcessing rotational speed signals within the 3500 machinery protection architecture, the \u003cstrong\u003eBently Nevada 3500\/50-04-00\u003c\/strong\u003e operates as a high-precision tachometer module designed to accept input from proximity probes or magnetic pickups. This module measures shaft rotational speed, rotor acceleration, and reverse rotation, conditioning these inputs to drive alarms and provide critical overspeed protection. The \u003cstrong\u003e3500\/50-04-00\u003c\/strong\u003e model variant features an I\/O module with internal barriers and internal terminations, providing built-in intrinsic safety for transducers located in hazardous industrial environments without requiring external barrier cabinets.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\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\u003eComprehensive Speed Metrics:\u003c\/strong\u003e Continuous monitoring of machine RPM, zero-speed detection, rotor acceleration, and reverse rotation indicators.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Intrinsic Safety:\u003c\/strong\u003e Equipped with internal barriers that isolate field wiring, eliminating the footprint and cost of external isolation barriers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Transducer Compatibility:\u003c\/strong\u003e Direct interface capability with Bently Nevada Proximitor sensors, magnetic pickups, and active shaft-speed encoders.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Alarm Logic:\u003c\/strong\u003e Dynamic alarm configuration (Alert and Danger) via 3500 configuration software, supporting latching or non-latching parameters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOn-Board Diagnostics:\u003c\/strong\u003e Real-time self-test functions that continuously monitor transducer loop integrity and point out circuit faults.\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\u003eOverspeed protection and RPM monitoring of utility steam turbines.\u003c\/li\u003e\n  \u003cli\u003eCritical speed and reverse rotation tracking in large centrifugal compressors.\u003c\/li\u003e\n  \u003cli\u003eHydroelectric generator speed sensing and start-up sequence interlocking.\u003c\/li\u003e\n  \u003cli\u003eHigh-speed turboexpander and industrial gas turbine protection systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; margin-bottom: 1.5rem;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"border-bottom: 2px solid #2b6cb0;\"\u003e\n      \u003cth style=\"text-align: left; padding: 8px;\"\u003eOption Code\u003c\/th\u003e\n      \u003cth style=\"text-align: left; padding: 8px;\"\u003eDescription\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n      \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e3500\/50\u003c\/td\u003e\n      \u003ctd style=\"padding: 8px;\"\u003eTachometer Module (Main Monitor Board)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n      \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e-04\u003c\/td\u003e\n      \u003ctd style=\"padding: 8px;\"\u003eI\/O Module with Internal Barriers and Internal Terminations\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n      \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003e-00\u003c\/td\u003e\n      \u003ctd style=\"padding: 8px;\"\u003eAgency Approval: None \/ Pending\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\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;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #2b6cb0;\"\u003e\n        \u003cth style=\"text-align: left; padding: 8px;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 8px;\"\u003eSpecification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eBently Nevada\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003ePart Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3500\/50-04-00\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModule Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eTachometer Module with Internal Barriers\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eI\/O Configuration\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eInternal Terminations, Internal Safety Barriers\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMain Board Dimensions\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e241.3 mm x 24.4 mm x 241.8 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eI\/O Module Dimensions\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e241.3 mm x 24.4 mm x 163.1 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModule Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e1.28 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e3.00 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCountry of Origin\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eUnited States\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; margin-bottom: 1.5rem;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"border-bottom: 2px solid #2b6cb0;\"\u003e\n      \u003cth style=\"text-align: left; padding: 8px;\"\u003eTerminal Group\u003c\/th\u003e\n      \u003cth style=\"text-align: left; padding: 8px;\"\u003eFunction Assignment\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n      \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCh 1 \/ Ch 2 \/ Ch 3 \/ Ch 4\u003c\/td\u003e\n      \u003ctd style=\"padding: 8px;\"\u003eIndependent speed\/proximity probe input channels\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n      \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003ePWR \/ COM \/ SIG \/ SHLD\u003c\/td\u003e\n      \u003ctd style=\"padding: 8px;\"\u003eTransducer power supply (-24 Vdc), common return, input signal, and shield ground\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"border-bottom: 1px solid #cbd5e0;\"\u003e\n      \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eREC OUT\u003c\/td\u003e\n      \u003ctd style=\"padding: 8px;\"\u003eBuffered transducer analog output signals for external diagnostic recorders\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe 3500\/50-04-00 with internal barriers cannot be hot-swapped into a backplane slot configured for non-barrier I\/O (such as the standard 3500\/50-01-00) without first updating the rack configuration. Attempting to run a mismatch between physical I\/O type and software definitions triggers a configuration fault in the 3500 Rack Interface Module (RIM).\u003c\/p\u003e\n\n\u003ch4\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eInternal barrier loops introduce a fixed, series current-limiting resistance. When pairing this module with long field cable runs (exceeding 300 meters), calculate the total loop resistance to ensure the signal voltage does not drop below the minimum trigger threshold of the tachometer input circuitry, especially at high rotational frequencies.\u003c\/p\u003e\n\n\u003ch4\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eAlways verify the transducer type (Proximitor vs. Magnetic Pickup) using the 3500 Configuration Software before applying power to the field loop. Selecting the incorrect sensor type can cause the internal barrier to trip or limit current, leading to persistent \"Not OK\" status indications on the tachometer front panel.\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;\"\u003eIsolate and de-energize the entire 3500 instrument rack and all associated field loops before inserting or removing the 3500\/50-04-00 module. Failure to de-energize can damage sensitive internal barrier circuitry and compromise explosive-area safety ratings.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 10px; flex-shrink: 0;\"\u003e1\u003c\/span\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eVerify that the physical keying pegs on the rear of the 3500 rack correspond to the correct option slots for the Tachometer Module and its I\/O baseboard.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 10px; flex-shrink: 0;\"\u003e2\u003c\/span\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eSlide the main monitor board into the front guide rails of the rack, and secure it firmly using the captive chassis screws.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 10px; flex-shrink: 0;\"\u003e3\u003c\/span\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eMount the internal barrier I\/O module into the corresponding slot on the rear panel of the rack, securing the module with its mounting fasteners.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 10px; flex-shrink: 0;\"\u003e4\u003c\/span\u003e\n    \u003cp style=\"color: #2d3748; margin: 0;\"\u003eConnect field wiring to the screw terminal blocks, ensuring that transducer shields are terminated according to Bently Nevada grounding standards.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52668291645803,"sku":"3500\/50-04-00","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/350050-04-00-y22xiayhuz3_64f84d77-5acd-493b-ba1b-3bffc09f6bec.jpg?v=1765520358","url":"https:\/\/www.plcprotech.com\/pt\/products\/bently-nevada-3500-50-04-00-3500-series-tachometer-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}