{"product_id":"yokogawa-ut150l-limit-controller","title":"Yokogawa UT150L Limit Controller","description":"\u003cp\u003eThe Yokogawa UT150L is a digital limit controller designed to monitor process variables and provide high-limit or low-limit protection based on a configured setpoint. It features a universal measurement input, latching limit action, two optional alarm outputs, and a maximum-value register. The 1\/16 DIN panel-mounted instrument also supports optional RS-485 communication and PV retransmission, depending on the ordered configuration.\u003c\/p\u003e\n\u003ch3\u003eLimit Control Function\u003c\/h3\u003e\n\u003cp\u003eThe UT150L monitors a measured process variable (PV) against a configured limit setpoint. It can operate as either a high-limit or low-limit controller, allowing the trip direction to match the monitored process condition.\u003c\/p\u003e\n\u003cp\u003eIts latching limit action retains the limit event until the appropriate reset operation is performed. This behavior distinguishes limit protection from ordinary continuous PID temperature regulation.\u003c\/p\u003e\n\u003cp\u003eThe controller also provides a timer for recording the duration that the setpoint is exceeded and a register for retaining the maximum temperature reached.\u003c\/p\u003e\n\u003ch3\u003eUniversal Measurement Input\u003c\/h3\u003e\n\u003cp\u003eThe universal input supports different sensor and signal types selected through software configuration. Supported input categories include thermocouples, resistance temperature detectors (RTDs), and DC voltage signals.\u003c\/p\u003e\n\u003cp\u003eThe selected input type and range must correspond to the connected sensor or transmitter. Input configuration therefore needs to be checked when replacing an existing controller, particularly when the replacement uses a different sensor type or measurement range.\u003c\/p\u003e\n\u003ch3\u003eControl Output and Limit Relay Operation\u003c\/h3\u003e\n\u003cp\u003eThe UT150L uses a single relay contact as its limit control output. When the measured value exceeds the configured setpoint, the relay de-energizes and the OUT indicator remains active even after the process value returns to its normal range.\u003c\/p\u003e\n\u003cp\u003eThe output remains in the de-energized state until an operator performs the confirmation operation. Confirmation is not accepted while the measured value continues to exceed the setpoint. This latching behavior allows the limit event to remain visible for operator attention.\u003c\/p\u003e\n\u003ch3\u003eAlarm and Retransmission Options\u003c\/h3\u003e\n\u003cp\u003eThe controller supports additional functions through selectable option codes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\/AL: Two alarm relay outputs with 22 selectable alarm types, including PV high\/low limits, deviation alarms, fault diagnosis and FAIL output.\u003c\/li\u003e\n\u003cli\u003e\/RET: 4-20 mA DC retransmission of the measured process value, with a maximum load resistance of 600 ohms.\u003c\/li\u003e\n\u003cli\u003e\/EX: One external contact input for resetting the exceeded status.\u003c\/li\u003e\n\u003cli\u003e\/RS: RS-485 communication interface supporting PC link, ladder communication and MODBUS protocols.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \/RS and \/EX options cannot be specified simultaneously. These options must be verified against the complete instrument ordering code rather than assumed to be included in every UT150L unit.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003eUT150L\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital Limit Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Size\u003c\/td\u003e\n\u003ctd\u003e1\/16 DIN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Input\u003c\/td\u003e\n\u003ctd\u003e1 universal input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Types\u003c\/td\u003e\n\u003ctd\u003eThermocouple, RTD, DC mV and DC V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Configuration\u003c\/td\u003e\n\u003ctd\u003eSoftware selectable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Sampling Period\u003c\/td\u003e\n\u003ctd\u003e500 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermocouple Input Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-2 deg C +\/-1 digit, subject to sensor-specific conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRTD Input Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-1 deg C +\/-1 digit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Input Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-0.3% +\/-1 digit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimit Control\u003c\/td\u003e\n\u003ctd\u003eHigh-limit or low-limit operation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimit Action\u003c\/td\u003e\n\u003ctd\u003eLatching output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Output\u003c\/td\u003e\n\u003ctd\u003e1 relay contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Contact Capacity\u003c\/td\u003e\n\u003ctd\u003e3 A at 240 VAC or 3 A at 30 VDC, resistive load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlarm Outputs\u003c\/td\u003e\n\u003ctd\u003e2 relay contacts with \/AL option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlarm Relay Capacity\u003c\/td\u003e\n\u003ctd\u003e1 A at 240 VAC or 1 A at 30 VDC, resistive load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRetransmission Output\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC with \/RET option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Input\u003c\/td\u003e\n\u003ctd\u003e1 point with \/EX option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eRS-485 with \/RS option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd\u003ePC Link, Ladder Communication, MODBUS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Communication Distance\u003c\/td\u003e\n\u003ctd\u003e1,200 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Connected Controllers\u003c\/td\u003e\n\u003ctd\u003e31\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e100-240 VAC +\/-10%, 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Power Consumption\u003c\/td\u003e\n\u003ctd\u003e8 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Panel Protection\u003c\/td\u003e\n\u003ctd\u003eIP65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eFlush panel mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003eScrew terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePanel Cutout\u003c\/td\u003e\n\u003ctd\u003e45 x 45 mm (+0.6\/0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Dimensions\u003c\/td\u003e\n\u003ctd\u003e48 x 48 mm front panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Operating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 50 deg C; 0 to 40 deg C for side-by-side mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Humidity\u003c\/td\u003e\n\u003ctd\u003e20-90% RH, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarm-up Time\u003c\/td\u003e\n\u003ctd\u003eAt least 30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-25 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Approval\u003c\/td\u003e\n\u003ctd\u003eFM-3810 and FM-3545\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Standards\u003c\/td\u003e\n\u003ctd\u003eIEC\/EN 61010-1, UL508, CSA C22.2 No. 61010-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eSpecifications based on Yokogawa General Specifications GS 05C01E22-01E. Option-dependent functions require the corresponding ordered configuration.\u003c\/p\u003e\n\u003ch3\u003eInstallation and Configuration Considerations\u003c\/h3\u003e\n\u003cp\u003eThe UT150L is designed for flush panel mounting with screw-terminal connections. Its front panel provides IP65 dust-proof and drip-proof protection under the specified mounting conditions. This protection is not maintained when multiple controllers are installed side by side.\u003c\/p\u003e\n\u003cp\u003eFor replacement applications, verify the panel cutout, supply voltage, sensor input configuration, relay contact requirements and installed option codes. The controller requires a minimum 30-minute warm-up period under the manufacturer's specified operating conditions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the Yokogawa UT150L operate as both a high-limit and low-limit controller?\u003c\/p\u003e\n\u003cp\u003eA: It can be configured for either high-limit or low-limit operation. The selected limit direction determines whether the controller responds when the measured process value rises above or falls below the configured threshold.\u003c\/p\u003e\n\u003cp\u003eQ: Does every UT150L include RS-485 communication and two alarm outputs?\u003c\/p\u003e\n\u003cp\u003eA: No. RS-485 communication requires the \/RS option, while two additional alarm relay outputs require \/AL. The \/RS and \/EX options are mutually exclusive and cannot be specified together.\u003c\/p\u003e\n\u003cp\u003eQ: Can the UT150L retransmit its measured temperature to another controller or monitoring system?\u003c\/p\u003e\n\u003cp\u003eA: Yes, when equipped with the \/RET option. It provides a 4-20 mA DC retransmission signal representing the measured process value, with a maximum load resistance of 600 ohms.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":69302856646898,"sku":"UT-150L","price":245.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/UT-150L2.jpg?v=1794479357","url":"https:\/\/www.petrospare.com\/products\/yokogawa-ut150l-limit-controller","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}