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Yokogawa UT35A Digital Indicating Controller
- Measurement Sampling Speed: Selectable 50 ms, 100 ms, or 200 ms sampling cycle for dynamic and sensitive process loops
- Display Technology: Active 14-segment color LCD screen with color-switching alarm indication and multi-parameter character scrolling
- Control Algorithms: Continuous PID, simultaneous heating/cooling dual-loop PID, position-proportional control, and manual regulation
- Embedded Sequence Logic: Built-in ladder sequence control engine executing up to 400 program steps without an external PLC
- Universal Multi-Input: High-accuracy universal inputs accepting thermocouples, platinum RTDs (Pt100/JPt100), and DC analog signals (0–5V, 1–5V, 0–10V, 4–20 mA)
- Control Output Options: Relay contacts (250V AC 3A), SSR voltage pulse drive (12V DC), or linear 4–20 mA current transmission
- Industrial Communications: Built-in RS-485 serial interface and optional 10/100 Mbps Ethernet supporting Modbus RTU/TCP protocols
Description
The Yokogawa UT35A Indicating Controller delivers high-speed sampling, multi-loop PID regulation, and built-in ladder sequence control engineered specifically for heat treatment furnaces, chemical reactors, semiconductor tooling, and industrial test benches.
Advanced Process Regulation with the Yokogawa UT35A Indicating Controller
Engineered for mission-critical automation systems, the Yokogawa UT35A Indicating Controller features a rapid 50 ms measurement sampling period. This high processing speed ensures precise thermal loop control, minimal setpoint overshoot, and immediate rejection of rapid line disturbances. Its active 14-segment color LCD display presents process variables, setpoint values, and intuitive navigation text with exceptional visual contrast across broad viewing angles.
The instrument incorporates sequence control based on standard ladder logic programming directly within the controller architecture. By executing internal sequence algorithms alongside primary PID functions, it coordinates external digital I/O, alarm interlocks, and timer logic without requiring an external micro-PLC. Equipped with standard RS-485 and optional Ethernet communications, the unit links smoothly to supervisory control systems, HMIs, and plant-wide DCS architectures.
Key Features and Engineering Advantages
- 50 ms High-Speed Sampling: Delivers instantaneous calculation updates to stabilize fast-reacting thermal and pressure processes.
- Embedded Sequence Ladder Control: Executes up to 400 ladder steps to coordinate peripheral digital logic, interlocks, and alarms natively.
- Active 14-Segment Color LCD: High-visibility display with color-changing states alerts operators to alarm conditions instantly.
- Universal Input and Output Architecture: Supports thermocouples, RTDs, and linear DC current/voltage inputs without changing internal hardware.
- Comprehensive Industrial Networking: Features native Modbus/RTU, Modbus/TCP, and open fieldbus protocols for seamless SCADA integration.
Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Product Series | Yokogawa UT35A Indicating Controller (UTAdvanced Series) |
| Sampling Period | 50 ms, 100 ms, or 200 ms (selectable) |
| Input Signals | Universal (Thermocouples, RTD Pt100/JPt100, DC 0-5V, 1-5V, 0-10V, 4-20mA DC) |
| Measurement Accuracy | ±0.1% of reading ±1 digit (under standard operating conditions) |
| Control Action | Continuous PID, Heating/Cooling PID, Position-Proportional, On/Off |
| Main Control Outputs | Relay contact (250V AC 3A), Voltage pulse for SSR (12V DC), or 4–20 mA DC current |
| Sequence Ladder Capacity | Up to 400 steps (integrated basic sequence instructions) |
| Communication Interfaces | RS-485 (Modbus/RTU, PC-link) or Ethernet (Modbus/TCP) |
| Supply Voltage | 100–240V AC (50/60 Hz) standard; 24V AC/DC optional |
| Front Enclosure Protection | IP66 / NEMA 4X front bezel washdown protection |
| Dimensions | DIN 96 × 96 mm (Panel depth: 65 mm) |
Industrial Applications and Process Integration
The Yokogawa UT35A Indicating Controller is widely implemented across critical continuous process and batch operations, including:
- Industrial vacuum furnaces, heat treatment ovens, and metal annealing chambers.
- Chemical synthesis reactors, polymerization vessels, and pilot plant skid packages.
- Semiconductor wafer processing equipment and environmental testing enclosures.
- Utility power plant auxiliary steam headers, boiler feedwater loops, and incinerators.
Frequently Asked Questions
What is the advantage of the built-in ladder sequence control in the Yokogawa UT35A?
The integrated ladder engine allows the Yokogawa UT35A Indicating Controller to handle digital interlocking, automated recipe selection, and auxiliary sequencing directly within the controller, eliminating the need to install a separate micro-PLC for basic machine safety and operational routines.
Can the display color change dynamically based on process alarm status?
Yes. The active 14-segment color LCD can be programmed to switch colors automatically (e.g., from green or white to red) when high or low limit alarm thresholds are breached, ensuring rapid visual recognition from the plant floor.
Which communication protocols are natively supported?
The controller supports standard RS-485 serial communication with Modbus RTU and PC-link protocols, as well as optional 10/100 Mbps Ethernet communication supporting Modbus TCP/IP for direct integration into industrial SCADA and DCS networks.
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