Description

Yokogawa UT55A Digital Indicating Temperature Controller

Core Overview

• Type: Single‑loop digital indicating controller (non‑programming, fixed setpoint)
• Panel Size: 96 × 48 mm (1/4 DIN), depth ~65 mm (compact for panel space saving)
• Key Differentiator: Up to 4 analog inputs, 500‑step ladder logic, and extensive communication optionsYokogawa

Model Code Structure (Example: UT55A‑000‑10‑00)

Key Specifications

Input

• Analog Inputs: Up to 4 channels (universal: TC, RTD, DC mV, V, mA)Yokogawa
• Accuracy: ±0.1% FS (after calibration)Yokogawa
• Sampling Period: 0.1–10 s adjustable; control period: 50/100/200 msYokogawa
• Loop Power: Standard 15 V DC; optional 24 V DC for transmitters

Control & Algorithms

• Control Modes: 8 built‑in modes (single‑loop, cascade primary/secondary, PV‑switch, etc.)
• Control Types: PID, ON/OFF, heating/cooling, position proportional, fuzzy logic, feed‑forward, batch PID
• PID Sets: 8 independent PID groups (auto‑tune, anti‑windup)

I/O Configuration

• Digital Inputs (DI): Up to 9 channels (standard 8)
• Digital Outputs (DO): Up to 18 channels (combinable)
• Alarms: 3 independent common alarm terminals (standard); expandable
• Main Output: Configurable (relay, voltage pulse, 4–20 mA current)

Ladder Logic

• Standard: 500 steps for interlock, sequence, and alarm logic (program via LL50A software)Yokogawa

Display & Physical

• Display: 14‑segment 5‑digit color LCD (red/white), bar graph, sunlight‑readable
• Power: 100–240 V AC, 50/60 Hz; ~5 W
• Operating: ‑10 to +50 °C, ≤85% RH (non‑condensing)
• Front Protection: IP66 (NEMA4) dust‑proof/drip‑proof
• Certifications: UL/CSA, RoHS; 3‑year warranty

Communication

• Standard: RS‑485 (Modbus RTU, peer‑to‑peer)
• Options: Ethernet (Modbus TCP), Profibus‑DP, CC‑Link, DeviceNet
• Multi‑language: English, Chinese, Japanese, German, French, Spanish, Korean

Key Features

• 4‑Channel Universal Input: Supports diverse sensors for multi‑variable monitoringYokogawa
• 500‑Step Ladder Logic: Eliminates need for external PLC in many applicationsYokogawa
• Compact 65‑mm Depth: Ideal for space‑constrained control panels
• Open‑Network Support: Seamless integration with factory automation systems
• Color LCD & Navigation Keys: Intuitive setup and monitoring