{"product_id":"yokogawa-ast143-tc-mv-input-module","title":"Yokogawa AST143 TC\/mV Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa AST143\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eAST143\u003c\/strong\u003e TC\/mV Input Module, operates as a dedicated hardware component for multi-channel thermal sensor evaluation, low-level voltage digitization, and high-density signal conversion within Yokogawa distributed control system (DCS) platforms. Configured to interface directly with thermoelectric transducers across 16 independent pathways, the solid-state module provides direct physical\/electrical execution to update centralized control databases with stabilized process variables.\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\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eAST143\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.30 kg (0.66 lbs) net component mass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e120 mm x 100 mm x 39 mm (W x H x D) structural layout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to 70 deg C continuous plant limits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC +\/- 10% nominal auxiliary input rails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Draw Profile\u003c\/td\u003e\n\u003ctd\u003e150 mA at 5 V DC logic rail | 80 mA at 24 V DC field rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Configuration\u003c\/td\u003e\n\u003ctd\u003e16 hardware channels (fully isolated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Input Capability\u003c\/td\u003e\n\u003ctd\u003eThermocouple (TC) | Millivolt (mV) DC fields\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware Input Range\u003c\/td\u003e\n\u003ctd\u003eThermocouples: -200 to 1500 deg C | RTDs: -200 to 800 deg C | Thermistors: -50 to 150 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Conversion Scaling\u003c\/td\u003e\n\u003ctd\u003eTranslated to 4 to 20 mA digital field variables over HART protocol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/- 0.2% of operational span limits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Precision at 23 deg C\u003c\/td\u003e\n\u003ctd\u003eTC: +\/- 40 uV | mV: +\/- 80 uV baseline thresholds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Update Frequency\u003c\/td\u003e\n\u003ctd\u003e10 ms continuous internal conversion cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;= 1 MOhm static threshold (Power ON or OFF states)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Dielectric Strength\u003c\/td\u003e\n\u003ctd\u003e1500 V AC continuous between internal circuits and active channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAnalog Input Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control \u0026amp; DCS Instrumentation Rails\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol and Channel-to-Channel Isolation\u003c\/strong\u003e The hardware layout implements full galvanic channel-to-channel isolation rated at a 1500 V AC withstanding voltage limit. This architecture separates each of the 16 measurement tracks, neutralizing localized ground loops and transient spikes while utilizing the HART protocol to pass primary temperature parameters alongside secondary sensor diagnostics straight to host controller files.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCold Junction Compensation and Signal Conversion Stability\u003c\/strong\u003e The input circuitry incorporates an integrated reference junction compensation block maintaining an accuracy limit of +\/- 1 deg C (with Type B exceptions below 44 deg C). This dynamic tracking framework automatically subtracts parasitic thermoelectric voltage vectors created at the terminal block junctions, preserving signal conversion integrity against ambient drift factors of +\/- 125 uV per 10 deg C for thermocouples.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the module handle temperature measurement parameters if an open-circuit wire break occurs on a thermocouple channel?\u003c\/p\u003e\n\u003cp\u003eA: The module operates an autonomous burnout detection routine natively at the hardware tier. When an open loop is detected on any of the 16 channels, the internal processing logic forces that specific data register to a pre-configured upscale or downscale safety threshold and transmits an explicit sensor fault code via the HART protocol to trigger an instrumentation alarm.\u003c\/p\u003e\n\u003cp\u003eQ: What operational risks occur if the input resistance drops below the 1 MOhm specification during a complete power loss?\u003c\/p\u003e\n\u003cp\u003eA: The AST143 is engineered to maintain a high input resistance of \u0026gt;= 1 MOhm whether powered or unpowered. This prevents the module from acting as a parasitic electrical load on the thermocouple wireway during a sudden shutdown, safeguarding parallel measurement paths or safety indicators connected to the same thermal node from signal loading errors.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":47634799722686,"sku":"AST143","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-15_17-41-27.png?v=1781518016","url":"https:\/\/www.autooiltech.com\/products\/yokogawa-ast143-tc-mv-input-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}