{"product_id":"turck-mk21-122ex0-r-speed-monitor-unit-trusted-supplier","title":"MK21-122EX0-R | Turck Rotational Speed Monitor, NAMUR, Ex ia, Dual Relay Output","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"137\" data-end=\"417\"\u003eThe Turck MK21-122EX0-R is a single-channel rotational speed monitor designed for overspeed and underspeed detection in industrial applications. It supports intrinsically safe NAMUR inputs and provides relay-based outputs for reliable monitoring and control. This unit is intended for use in systems where precise speed supervision and hazardous area compatibility are required.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 100%; height: 292.357px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eTurck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eIndustrial Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eMK21-122EX0-R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eSpeed Monitoring Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eMK21 Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eAlternate Manufacturer Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eMK21122EX0R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eMonitoring Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eOverspeed \/ Underspeed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eSensor Input Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eNAMUR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eInput Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eIntrinsically Safe Ex ia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 10px;\"\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eOutput Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003e2 × SPDT Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003e20–250 VAC \/ 20–125 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eEnclosure Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eStatus Indication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003eLED Indicators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 37.2489%;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 62.5318%;\"\u003e0.4 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About MK21-122EX0-R\u003c\/h4\u003e\n\u003cp\u003eThe MK21-122EX0-R belongs to Turck’s MK21 series of monitoring relays, engineered for rotational speed supervision in safety-critical environments. It is designed to interface with NAMUR sensors via an intrinsically safe Ex ia input, making it suitable for hazardous area installations. The device evaluates speed conditions and switches relay outputs based on configurable overspeed or underspeed thresholds. Its compact IP20 enclosure and wide supply voltage range allow integration into control panels across various industrial sectors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-Channel Speed Monitoring: Provides dedicated monitoring for one rotational speed input.\u003c\/li\u003e\n\u003cli\u003eOverspeed and Underspeed Detection: Detects speed deviations beyond defined thresholds.\u003c\/li\u003e\n\u003cli\u003eIntrinsically Safe Input: Ex ia NAMUR input supports use in hazardous environments.\u003c\/li\u003e\n\u003cli\u003eNAMUR Sensor Compatibility: Designed for standardized proximity and speed sensors.\u003c\/li\u003e\n\u003cli\u003eDual Relay Outputs: Two SPDT relay outputs for flexible control and signaling.\u003c\/li\u003e\n\u003cli\u003eWide Supply Voltage Range: Operates on 20–250 VAC or 20–125 VDC.\u003c\/li\u003e\n\u003cli\u003eLED Status Indicators: Visual indication of operating state and relay status.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe MK21-122EX0-R delivers the reliability and precision required for rotational speed monitoring and safety-related shutdown applications.\u003c\/p\u003e","brand":"Turck","offers":[{"title":"Default Title","offer_id":51051292066090,"sku":"MK21-122EX0-R","price":694.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/s-l1600_f241f3b9-3554-43e2-a7c7-bdebcaf57afa.webp?v=1768321457","url":"https:\/\/iqelectro.com\/products\/turck-mk21-122ex0-r-speed-monitor-unit-trusted-supplier","provider":"IQElectro","version":"1.0","type":"link"}