{"product_id":"emerson-epro-mms-6418-dual-channel-displacement-measuring-amplifier","title":"Emerson EPRO MMS 6418 Dual Channel Displacement Measuring Amplifier","description":"\u003ch3 class=\"\"\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003e\u003cspan class=\"\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong class=\"\"\u003eMMS 6418 (MMS6418)\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eis a specialized dual-channel measuring amplifier belonging to the Emerson (formerly EPRO) MMS 6000 Machine Monitoring System.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eThis module is specifically engineered for high-precision\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong class=\"\"\u003eshaft displacement and absolute expansion\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003emeasurements on critical rotating machinery,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003esuch as steam turbines,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003egas turbines,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eand large centrifugal compressors.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eBy utilizing inductive transducers in half- or full-bridge configurations,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ethe MMS 6418 provides the essential data required for Turbomachinery Protection (TSI),\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eensuring that thermal expansion or mechanical shifts do not lead to catastrophic machine contact.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eIts \"Hot-Swap\" capability and redundant power inputs make it a staple in high-availability power plants and refineries where monitoring continuity is non-negotiable.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"\"\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003e\u003cspan class=\"\"\u003eThe MMS 6418 operates as a stand-alone monitor or as part of a networked system.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eIt features a signal frequency range up to 100 Hz,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003emaking it ideal for slow-motion displacement tracking rather than high-frequency vibration.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eA key technical advantage is its ability to combine results from both channels internally to calculate\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong class=\"\"\u003esum and difference values\u003c\/strong\u003e\u003cspan class=\"\"\u003e,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ewhich is critical for complex differential expansion monitoring.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eThe sensor supply is balanced to ground to suppress industrial electromagnetic interference (EMI),\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eand the module includes extended self-checking facilities to ensure the integrity of the safety loop at all times.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMMS 6418\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eEmerson (EPRO)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSystem\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMMS 6000\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModule Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDual Channel Measuring Amplifier\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMeasurement Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAbsolute Expansion \/ Shaft Displacement\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSensor Compatibility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eInductive Transducers (PR 9266 to PR 9268)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFrequency Range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 100 Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInterfaces\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRS 232 (Local), RS 485 (Bus)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePower Supply\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRedundant Inputs (18 - 31.2 VDC)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eEnclosure Rating\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIP20\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.32 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24.5 x 17.0 x 6.2 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 class=\"\"\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong class=\"\"\u003eCan the MMS 6418 be replaced while the machine is running?\u003c\/strong\u003e\u003cspan class=\"\"\u003eYes,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ethe module is designed for \"Hot-Swapping,\u003c\/span\u003e\u003cspan class=\"\"\u003e\" allowing for replacement during operation without interrupting the power supply to other modules in the MMS 6000 rack.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eHowever,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eensure that the bypass or protection logic is managed at the DCS level to avoid accidental trips.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong class=\"\"\u003eWhat is the difference between this and a standard vibration module?\u003c\/strong\u003e\u003cspan class=\"\"\u003eStandard vibration modules (like the MMS 6110) measure velocity or acceleration at high frequencies.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eThe MMS 6418 is a displacement amplifier focused on \"DC-like\" movements (absolute expansion),\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003etracking how much a machine grows or shifts due to thermal changes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong class=\"\"\u003eHow do I configure the measuring range?\u003c\/strong\u003e\u003cspan class=\"\"\u003eConfiguration is handled via the front-facing RS 232 interface using a dedicated laptop or via the RS 485 bus.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eThe module allows for independent zero-adjustment and zero-shift regardless of the chosen measuring range.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 class=\"\"\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong class=\"\"\u003eTransducer Calibration:\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eSince the MMS 6418 relies on inductive bridge configurations,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eit is vital to perform a \"Cold Zero\" calibration during machine standstill.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eEnsure the inductive sensor (e.\u003c\/span\u003e\u003cspan class=\"\"\u003eg.,\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ePR 9268) is mechanically centered within its linear range before final electrical zeroing in the software.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShielding and Grounding:\u003c\/strong\u003e\u003cspan\u003e To prevent \"Signal Drift\" caused by industrial noise,\u003c\/span\u003e\u003cspan\u003e the sensor cable shield must be continuous and grounded only at the rack side (Common Ground).\u003c\/span\u003e\u003cspan\u003e The balanced-to-ground sensor supply of the MMS 6418 is robust,\u003c\/span\u003e\u003cspan\u003e but ground loops can still introduce measurement errors in 4-20mA loops.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRedundancy Wiring:\u003c\/strong\u003e\u003cspan\u003e For mission-critical TSI (Turbine Supervisory Instrumentation),\u003c\/span\u003e\u003cspan\u003e always utilize the redundant power input pins on the backplane.\u003c\/span\u003e\u003cspan\u003e This ensures that a failure in a single power supply unit does not lead to a \"Protection Loss\" alarm for the expansion monitoring loop.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Emerson","offers":[{"title":"Default Title","offer_id":52695421223275,"sku":"MMS6418","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/emerson-mms6418-epro-interface-card-monitoring-o2wnnuiyj12_52e0de4d-81ee-4de7-9924-13caed6c0c6b.jpg?v=1766135421","url":"https:\/\/www.plcprotech.com\/products\/emerson-epro-mms-6418-dual-channel-displacement-measuring-amplifier","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}