UT155 {1/4 DIN} Green Indicating Temperature Controllers

Green Series Temperature Controllers (1/16 DIN)
(Affordable compact general purpose controllers)
— DISCONTINUED Replaced by UT35A/UT32A


  • 4 digit , 7 segment large LED display
  • 2 °C ±1 digit for TC — 1°C ±1 digit for RTD
  • 1 loop auto-mode and 2 setpoint
  • Universal inputs
  • Alarm types: 22 types
  • Dynamic auto tuning and Fuzzy logic tuning
  • Timer function- energizes / de-energizes output relay
  • 2 (alarm or timer outputs) and Retransmission
  • IP55 splash-proof and dust-proof designed front panel
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  • Optional heating/cooling control capability
    • ON/OFF, time-proportional and continuous PID, heating/cooling
  • Optional retransmission output of measured value (PV)
  • Optional timer function
  • Optional heater burnout alarm and two alarm output relays
  • Communications
    • RS485 communication (optional)
    • Modbus Communication (optional)
    • PC-Link & Ladder protocols are supported


  • Standard ON/OFF control applications
  • Heating and cooling control applications such as ceramic ovens, small furnaces and water heating and cooling, control cleaning equipment
  • Motorized valve control and valve actuation applications
  • Limit control applications


The UT155 Temperature Controller (1/4 DIN size) is an economical, easy-to-use temperature controller with a large display. The UT155 uses dynamic auto tune and the "SUPER" Overshoot Suppress function for precise limit control. Heating/cooling control, retransmission output, timer function and communication functions are available as optional features.

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UT100 series temperature controllers provide the functions and size you require for your application. An easy-to-read displays show input and set-point value. T/C or RTD inputs are standard and the output type is selectable: ON/OFF, voltage pulse or DC current.
  • Literature
  • Specifications
  • Accessories
Literature and Technical Information
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Panel Instrumentation

++ UT155| General specification sheet (1.7 MB)
++ UT155 | Manual 001 (1.2 MB)
++ UT155 | Manual 002 (803 kB)
++ UT155 | Brochure 001 (1.1 MB)
++ UT155 | Brochure 002 (803 kB)
++ UT155 | Communication Settings (344 kB)
++ Literature – LL100- General Specifications (78 kB)
Model: Yokogawa UT155 indicating controllers
PV/SP Data display: 4 digits 7 segments / 4 digits, 7 segments
PV inputs: 1 universal input (TCs, RTDs, mV, V)
Setpoints: 2
Control scan period: 500ms
Control Algorithms: ON/OFF, Time-proportional PID, Continuous PID, Heating & Cooling
SUPER, Auto tuning SUPER, Dynamic AT
Control Outputs Select from Relay, Voltage Pulse or 4 to 20mA
2 relay for motorized valve control
PV Retransmission Output: 1 point (4 to 20mA)
Timer Up to 99hours 59min.
Digital Outputs 2 (Alarm or Timer outputs)
Control Output: 1 point (for standard type) or 2 points (for heating/cooling type)
Outputs types
Relay Contact Output: 3 A at 240 V AC or 3 A at 30 V DC
Voltage Pulse Output: On voltage:12 to 18 V DC Off voltage:0.1 V DC or less
Current Output: Output signal: 4 to 20 mA Maximum load resistance: 600 Ω
Contact Inputs: 2 (sp1/sp2), RUN/STOP, Timer function
Loop power supply
Number: 1 point
Type: 15V ( Cannot use with auxiliary analog output )
Communication (optional)
Type: Two-wire, MODBUS, PC-link, Ladder
Front Protection: IP55
Power Supply: 24VAC/DC or 90 to 264V AC (±10%), 50/60Hz
Power Consumption: 8VA
General Approvals UL, CE, CSA
Operating Temperature: 0 to 50°C ( 40°C or less in close mounting side-by-side)
Relative Humidity: 20 to 90% RH (no condensation)
Storage Temperature: -25 to 70°C
Dimensions: 48(W)×48(H)×100(D) (mm)
Mounting: Direct panel mounting; mounting bracket, one each for upper and lower mounting
Weight: 0.4 kg

PC-based Setup Parameters & Custom Computation Building Tools

For UT100 Series Controllers
LL100 Light loader computing

The LL100 Parameter Setting Tool is a software package that enables you to set the functional configuration parameters (setup parameters) and operation parameters of a digital indicating controller and a program controller, as well as the program patterns of a program controller, on a PC. The tool lets you the followings:

  • Setting parameters
  • Uploading, downloading and comparing the parameters in the controllers
  • Saving and reading the parameters stored on the storage media
  • Printing out parameters
  • Multi-monitoring
LL200 connection image

Parameter Setting Display

Simple configuration and parameter help text. In addition to parameter setting, the following functions can be used on this display:

  • Uploading, downloading and comparing the parameters in the controller
  • Saving and reading the parameters stored on the storage media
  • Printing out parameters

Proper management of the setting file minimizes the downtime during maintenance and inspection.

Tuning Display

Trend display of measured values (PV), setting values (SP), and control output values (OUT). Manual tuning is much more efficient when trends of the process can be easily viewed. Auto-tuning and output value setting during manual operation are also possible.

Program Pattern Display

Used to create program patterns. The graphical pattern display allows event settings to be checked at a glance.

Multi-monitoring function for centralized monitoring (up to 16 loops)

  • Easy-to-see trend display- Displays the trends of measured values (PV), setting values (SP), and control output values (OUT).
  • Easy-to-understand panel view- Alarms can be checked at a glance.
  • Automatic recognition for quick connection- Can view up to 16 loops.
  • User-friendly tuning display- PID and operational settings can be changed.
  • Saving in CSV format- Saved data can be readily used in Excel, etc.