{"product_id":"yokogawa-am25t-25-channel-solid-state-multiplexer","title":"Yokogawa AM25T 25-Channel Solid State Multiplexer","description":"\u003ch2\u003eYokogawa AM25T 25-Channel Solid State Multiplexer\u003c\/h2\u003e\n\u003cp\u003eConfigured for thermocouple channel expansion in Campbell Scientific data logger systems, the \u003cstrong\u003eYokogawa AM25T 25-Channel Solid State Multiplexer\u003c\/strong\u003e (\u003cstrong\u003eAM25T\u003c\/strong\u003e Multiplexer) provides direct physical\/electrical execution of multi-channel analog signal routing across Campbell Scientific data acquisition platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware 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\u003eModelBrand\u003c\/td\u003e\n\u003ctd\u003e AM25T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.9 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e23.6 x 5.1 x 13.2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperatingTemp\u003c\/td\u003e\n\u003ctd\u003e-40 degC to +85 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePowerConsumption\u003c\/td\u003e\n\u003ctd\u003e9.6 to 16 VDC, quiescent 0.5 mA, active 1.0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Capacity\u003c\/td\u003e\n\u003ctd\u003e25-channel solid state multiplexing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Limit\u003c\/td\u003e\n\u003ctd\u003eUp to 4 units per CR1000X\/CR1000\/CR3000, 3 per CR6, 2 per CR800\/CR850\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching Current\u003c\/td\u003e\n\u003ctd\u003eMax 25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Resistance\u003c\/td\u003e\n\u003ctd\u003e~500 ohm typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnable Logic\u003c\/td\u003e\n\u003ctd\u003eInactive \u0026lt; 0.9 V, Active 3.5 to 5 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScan Clock\u003c\/td\u003e\n\u003ctd\u003eFalling edge triggered, min ON 50 us, OFF 60 us\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel Multiplexing and Cold Junction Compensation Architecture\u003c\/h3\u003e\n\u003cp\u003eThe AM25T implements solid state channel scanning with sequential activation controlled by external clock and enable lines from Campbell Scientific data loggers. Signal routing is performed through low-level voltage switching paths designed for thermocouple and millivolt sensor inputs. Internal PRT-based cold junction compensation is specified with accuracy of ±0.2 degC in the -25 to +50 degC range and ±0.4 degC in the -40 to +85 degC range, maintaining reference junction stability under varying enclosure conditions. The switching matrix is constrained by a 25 mA maximum per channel to prevent relay degradation and ensure long-term contact stability.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum number of AM25T units supported per data logger?\u003c\/strong\u003e\u003cbr\u003eA: Support varies by controller: up to 4 units for CR1000X\/CR1000\/CR3000, 3 units for CR6, and 2 units for CR800\/CR850, based on sequential scanning constraints.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What happens if switching current exceeds 25 mA?\u003c\/strong\u003e\u003cbr\u003eA: Exceeding 25 mA can cause permanent damage to the internal solid state switching elements, resulting in degraded or non-functional channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is channel scanning simultaneous or sequential?\u003c\/strong\u003e\u003cbr\u003eA: Channel activation is sequential, controlled by external clock pulses with falling-edge triggering logic.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the AM25T on a stable DIN rail or fixed enclosure backplate to minimize mechanical stress on terminal blocks. Maintain separation between thermocouple input wiring and power conductors to reduce noise coupling in low-level millivolt signals. Use twisted pair, shielded thermocouple extension wire and ground the shield at a single reference point to avoid ground loops. Ensure enable and clock signal lines remain within specified logic thresholds (0.9 V inactive, 3.5 to 5 V active). Do not exceed the 25 mA switching current limit on any channel path. Keep enclosure temperature within -40 degC to +85 degC operating limits.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44163759571032,"sku":"AMM25T","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/AMM25T.jpg?v=1780301811","url":"https:\/\/www.industriaxplc.com\/products\/yokogawa-am25t-25-channel-solid-state-multiplexer","provider":"IndustriaX Limited","version":"1.0","type":"link"}