Description

Yokogawa UT55A‑020‑10‑0 Digital Indicating Temperature Controller

Model Code Breakdown (UT55A‑020‑10‑0)

Core Specifications

Input

• Universal Input: 1 main channel (TC, RTD, DC mV/V/mA) + 1 extra auxiliary analog input
• Accuracy: ±0.1% FS (after calibration)
• Sampling/Control Period: 200 ms

Control & Algorithms

• Control Modes: 8 built‑in (single‑loop, cascade, PV‑switch, etc.)
• Control Types: PID, ON/OFF, heating/cooling, position proportionalYokogawa
• PID Sets: 4 standard setpoints (PID groups)
• Ladder Logic: 500 steps (program via LL50A)

I/O

• Digital Inputs (DI): 4 channels (3 standard + 1 extra)
• Digital Outputs (DO): 3 channels (standard alarms)
• Main Output: Configurable (relay, voltage pulse, 4–20 mA current)Yokogawa
• Alarms: 3 independent common alarm terminals

Display & Physical

• Display: 14‑segment 5‑digit color LCD (red/white), bar graph
• Panel Size: 96 × 96 mm (1/4 DIN), depth 65 mm
• Power: 100–240 V AC, 50/60 Hz; ~5 W
• Operating: ‑10 to +50 °C, ≤85% RH (non‑condensing)
• Front Protection: IP66 (NEMA4)
• Warranty: 3‑year

Communication

• Standard: RS‑485 (Modbus RTU, 4‑wire, up to 19.2 kbps)
• Languages: English, Chinese, Japanese, German, French, Spanish, Korean

Key Features

• Extra Analog Input: Enables dual‑sensor or remote setpoint applications
• Enhanced DI: 4 digital inputs for more interlock/sequence logic
• Built‑in Ladder Logic: Eliminates external PLC for many applications
• Color LCD & Navigation: Intuitive setup and monitoring
• Compact 65‑mm Depth: Ideal for space‑constrained panels