{"product_id":"eh1-a-yokogawa-centum-vp-input-isolator-card","title":"EH1*A  Yokogawa CENTUM VP Input Isolator Card","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Yokogawa EH1\u003cem\u003eA series (including models such as the EH11A) is a high-reliability Input Isolator Card used within the CENTUM control system architecture. It provides galvanic isolation for analog input signals, ensuring that field-side electrical disturbances such as ground loops and noise do not affect the integrity of signals entering the control system. By conditioning and isolating signals such as 4–20 mA and 1–5 V DC, the EH1\u003c\/em\u003eA helps maintain accurate and stable data acquisition for downstream processing. We supply this unit as 100% brand new, original factory hardware to ensure optimal signal integrity and dependable system performance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\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\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eEH1*A \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e7.6 cm × 5.1 cm × 12.7 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.35 kg \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Type\u003c\/td\u003e\n\u003ctd\u003eGalvanic isolation (input to output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Support\u003c\/td\u003e\n\u003ctd\u003e4–20 mA, 1–5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eStandard Yokogawa I\/O card nest compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003e100% Brand New Original\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eElimination of Ground Loops\u003c\/strong\u003e\u003cbr\u003eThe EH1*A isolates field-side and system-side grounds, preventing unwanted circulating currents caused by potential differences. This ensures accurate signal transmission and reduces measurement errors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Signal Response\u003c\/strong\u003e\u003cbr\u003eThe isolation circuitry maintains signal linearity with minimal phase delay, supporting responsive control in fast PID loops where timing precision is critical.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompact Modular Design\u003c\/strong\u003e\u003cbr\u003eIts compact form factor allows high-density installation within I\/O nests, maximizing the number of isolated channels available per cabinet and reducing overall system footprint.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Transient Protection\u003c\/strong\u003e\u003cbr\u003eIntegrated surge protection components help shield the control system from voltage spikes, electromagnetic interference, and transient events originating from field wiring.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the EH1*A require external power?\u003c\/strong\u003e\u003cbr\u003eNo, it is typically powered via the system backplane. Depending on configuration, it may also support loop-powered field devices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is the EH1*A different from a standard analog input module?\u003c\/strong\u003e\u003cbr\u003eThe EH1*A is an isolator\/conditioner that prepares signals, whereas analog input modules (e.g., AAI series) perform signal conversion from analog to digital for processing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the EH1*A handle thermocouple signals?\u003c\/strong\u003e\u003cbr\u003eNo, it is optimized for 4–20 mA and 1–5 V DC signals. Thermocouple and RTD inputs require dedicated modules designed for low-level signals and cold junction compensation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the EH1*A hot-swappable?\u003c\/strong\u003e\u003cbr\u003eYes, it supports hot-swapping, allowing replacement while the system remains powered, without affecting adjacent modules in the same nest.\u003c\/p\u003e","brand":"YOKOGAWA","offers":[{"title":"Default Title","offer_id":52012543541560,"sku":"EH1*A","price":188.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/EH1A2.jpg?v=1774923435","url":"https:\/\/www.automodulexpert.com\/products\/eh1-a-yokogawa-centum-vp-input-isolator-card","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}