The Yokogawa UT350-01 is a 1/4 DIN digital indicating controller engineered for precise temperature and process control in industrial applications. It combines universal input flexibility with advanced PID control algorithms, delivering stable setpoint regulation across heating and cooling circuits. The instrument features a bright 4-digit, 20 mm LED display for simultaneous process variable and setpoint indication, along with dedicated status LEDs for operational feedback.
Technical Specifications
Form Factor & Display
• 1/4 DIN compact panel mount
• 4-digit LED display, 20 mm character height
• Dimensions: 2.2 cm × 12.4 cm × 12.6 cm
• Weight: 0.1 kg
• IP55-compatible drip-proof front panel
Input Stage
• Universal Input System with software-selectable configuration
• Accepts thermocouple, RTD, DC current, and voltage inputs
• Single-channel PV input (terminals 11, 12, 13)
Control & Output
• PID control with auto-tuning capability
• SUPER overshoot suppression function
• SUPER2 hunting suppression function
• Heating/cooling dual-loop control
• Relay contact outputs rated 240 V AC / 1 A or 30 V DC / 1 A
• Contact leakage current: ≤100 µA (off state)
• Contact resistance: ≥20 kΩ (off state)
• 4-20 mA retransmission output (PV or setpoint)
• Programmable alarm outputs (up to two channels)
• Status detection hold time: ~1 second minimum
Power Supply
• Primary: 100–240 V AC (±10%), 50/60 Hz
• Loop power: 15 V DC standard (terminals 14, 15) or 24 V DC optional (terminals 21, 22)
• Loop supply max current: 21 mA
• Supplies power to 2-wire transmitter configurations
Communication
• Optional RS-485 interface
• Verified PLC connectivity: MELSEC-A, MELSEC-Q, MELSEC-FX
• Protocol support: Ladder communication or Modbus RTU
– Key Features
• Flexible universal input accommodates multiple sensor types without recalibration
• Auto-tuning PID eliminates manual gain adjustment during commissioning.
• Dual suppression functions (SUPER and SUPER2) minimize overshoot and hunting for faster response stability.
• Integrated loop power supply eliminates external transmitter PSU in many 2-wire configurations.
• Optional communications enable remote monitoring and supervisory control integration.
– Typical Applications
Temperature control loops in furnaces, reactors, and heat exchangers; process monitoring in batch and continuous manufacturing; setpoint regulation where multiple sensor types require single instrument support.
– Compatibility & Integration
Works with MELSEC PLC families and Modbus-compatible control systems. Supports 2-wire intelligent transmitters via integrated 15 V or 24 V DC loop power. Relay and analog outputs interface directly to solenoids, contactors, and data acquisition systems.
