{"product_id":"yokogawa-ut551-digital-indicating-controller","title":"Yokogawa UT551 Digital Indicating Controller","description":"\u003cp\u003eConfigured for precise temperature and process loop regulation in industrial monitoring networks, the \u003cstrong\u003eYokogawa UT551\u003c\/strong\u003e (\u003cstrong\u003eUT551\u003c\/strong\u003e Digital Indicating Controller) provides direct physical execution of PID control algorithms and alarm logic.\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\u003eUT551\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\u003e1.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e96 x 96 mm front panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-10 deg C to +50 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e100-240 VAC or 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Rating\u003c\/td\u003e\n\u003ctd\u003eIP66\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Types\u003c\/td\u003e\n\u003ctd\u003eThermocouple, RTD, DC voltage, DC current\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Outputs\u003c\/td\u003e\n\u003ctd\u003eRelay, Voltage pulse, Current, SSR drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eRS-485 Modbus RTU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Loop Control and Signal Isolation\u003c\/h3\u003e\n\u003cp\u003eThe UT551 integrates channel-to-channel isolation to maintain signal integrity across diverse input sensor types, including thermocouples and RTDs. The implementation of Super2 anti-hunting control algorithms facilitates stabilized process variable tracking, effectively reducing oscillation in high-gain control loops. The unit provides standard 4-20 mA HART loop protocol compatibility via external transducers where required, ensuring integration into broader DCS architectures. Cold junction compensation (CJC) is performed internally to ensure high-precision temperature measurements in variable ambient conditions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the RS-485 interface support multidrop configurations for integrated data acquisition?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the onboard RS-485 communication port supports Modbus RTU protocol, allowing the controller to function as a slave device in a multidrop network architecture for centralized monitoring.\u003c\/p\u003e\n\u003cp\u003eQ: Does the controller maintain control loop integrity during firmware configuration changes?\u003c\/p\u003e\n\u003cp\u003eA: The controller is designed to hold the last valid output state or a predefined fail-safe state during configuration updates; however, loop control is suspended while the device is in the parameter setup mode.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eEnsure the panel cutout meets the 96 x 96 mm dimension requirement, accounting for the mounting bracket depth.\u003c\/li\u003e\n\u003cli\u003eVerify that all signal wiring for thermocouples or RTDs utilizes shielded twisted-pair cabling to minimize electromagnetic interference (EMI).\u003c\/li\u003e\n\u003cli\u003eConnect the PE (Protective Earth) terminal to a dedicated facility ground to maintain the IP66 environmental protection rating and reduce common-mode noise.\u003c\/li\u003e\n\u003cli\u003eEnsure the AC or DC power supply rails are isolated from high-voltage motor load circuits to prevent voltage spikes from affecting the logic controller.\u003c\/li\u003e\n\u003cli\u003eConfirm that the terminal screw torque is within the manufacturer’s specified range (typically 0.5 - 0.6 Nm) to ensure secure contact and prevent localized heating.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":49208250106108,"sku":"UT551","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/UT551.jpg?v=1781761281","url":"https:\/\/www.electronicplc.com\/ar\/products\/yokogawa-ut551-digital-indicating-controller","provider":"Electronic PLC","version":"1.0","type":"link"}