Yokogawa UT35A-000-11-00 Temperature Controller

YOKOGAWA UT35A-000-11-00 DIGITAL INDICATING TEMPERATURE CONTROLLER (1/4 DIN)

The Yokogawa UT35A-000-11-00 is a 96 x 96 mm (1/4 DIN) digital indicating process and temperature controller engineered for precision loop regulation across heavy-duty industrial and marine applications. As part of Yokogawa’s premier UTAdvanced series, the UT35A features universal input architecture capable of handling thermocouples, RTDs, DC voltage, and current loops directly.

Built to maintain setpoint integrity in thermally volatile environments, this model leverages Yokogawa’s advanced “Super” overshoot-suppression and “Super 2” hunting-suppression algorithms alongside standard PID, ON/OFF, and flexible heating/cooling control schemes. With a shallow depth profile of only 65 mm behind the panel and built-in ladder sequence control, it integrates seamlessly into both tight control consoles and main machinery operating stations (E/R panels, thermal fluid skids, boiler control cabinets, and auxiliary processing plants).

Model Details

• Model: UT35A (Digital Indicating Controller, 100–240 V AC Standard Model)
• MPN: UT35A-000-11-00
• Type 1 (Basic Control): -0 = Standard Single-Loop Type
• Type 2 (Functions): 0 = Standard (None / Base I/O: 2 Digital Inputs, 3 Digital Outputs, Retransmission Output / 15 V DC Loop Power)
• Type 3 (Open Networks): 0 = None
• Display Language: 1 = English (Configurable to German, French, Spanish via software)
• Case Color: 1 = Black / Light Charcoal Gray
• Fixed Code: -00 = Standard Specification

Features

1. Advanced Dual “Super” Control Algorithms: Built-in “Super” overshoot suppression and “Super 2” hunting suppression ensure dead-beat recovery and stable settling times even during aggressive load disturbances.
2. Universal Measurement Input: Natively accepts 15 thermocouple types, 3 RTD types (Pt100, JPt100), mV DC, and DC mA signals with 0.1% measurement accuracy and up to 50 ms input sampling periods.
3. High-Visibility 14-Segment Active Color LCD: Features large, color-changing PV characters (White/Red for running and alarm states) and dynamic scroll guides for intuitive parameter assessment.
4. Integrated Ladder Logic Sequences: Includes built-in ladder sequence functional blocks, eliminating auxiliary interlock relays for local burner safeties, pumps, and trip sequencing.
5. Rugged 65 mm Depth Design: Space-saving enclosure with NEMA 4X / IP66 sealed front bezel designed for vibration-prone, harsh switchboards and console spaces.

Technical Specifications

Backward & Line Compatibility

• Direct Form-Fit Replacement for Legacy Series: Fully replaces legacy Yokogawa UT350, UT351, Green Series UT350-00, UT351-00, and UT150 (with minor panel bezel adapters where applicable).
• Direct Sister Models: UT32A (1/8 DIN, 48x96mm compact version), UT55A (1/4 DIN advanced dual-loop/networked unit).

Part Number Cross-Reference

• UT35A-000-11-00 : Standard Base Model (100–240 V AC, Single Loop, Black Case)
• UT35A-000-10-00 : Standard Base Model (White/Light Gray Case)
• UT35A-000-11-00/LP : Same base unit with factory-fitted 24 V DC loop power supply
• UT35A-010-11-00 : Enhanced model with RS-485 Modbus communication
• UT35A-020-11-00 : Enhanced model with Ethernet Modbus/TCP communication

From the Chief Automation Engineer’s Log:

• Noise Immunity on RTD/TC Wire Runs: When retrofitting into marine machinery spaces with high-frequency VFD noise (such as scrubber pumps or bow thrusters), do not run low-level thermocouple or RTD signal leads through the same cable trays or trunking as high-voltage AC lines. Always use individually shielded twisted pairs, grounding the shield drain wire at the panel side only to eliminate destructive ground loops.
• Current Input Shunt Resistor Caution: When utilizing this controller for a 4–20 mA loop on PV terminals 21 and 22, ensure you terminate with a precision 250.0 Ω (±0.1%, low temperature coefficient) resistor across the terminals. A loose or drifting shunt resistor will degrade your cold-junction compensation and cause setpoint drift.
• Thermal Shock & Mounting Torque: Do not over-torque the front bracket fixing screws. The specified tightening torque is 0.25 N·m. Over-tightening deforms the IP66 neoprene sealing gasket and cracks the ABS retaining brackets, compromising moisture ingress protection in humid environments.

Frequently Asked Questions

What does the model code suffix “-000-11-00” signify?

This code confirms a standard single-loop UT35A unit operating on 100–240 V AC supply without auxiliary communication cards. The first “1” sets the default display language to English, the second “1” denotes the black industrial case, and “-00” indicates standard base construction.

Can the Yokogawa UT35A-000-11-00 directly read a 4–20 mA transmitter?

Yes. The universal input handles 4–20 mA DC or 0–20 mA DC signals directly by connecting an external 250 Ω precision shunt across the analog input terminals (Terminals 21 and 22) and selecting current input in the setup menu.

How does the UT35A suppress overshoot on sudden load starts?

The unit utilizes Yokogawa’s proprietary “Super” algorithm. When a large disturbance or sudden setpoint step occurs, the controller temporarily shifts control limits using a non-linear trajectory to suppress overshoot while maintaining rapid rise times.

What is the panel cutout dimension required for replacing an older UT350?

The panel cutout for the UT35A is a standard 1/4 DIN size: 92 mm x 92 mm (+0.8 mm / -0.0 mm tolerance). Because both use the same standard cutout, the UT35A is a direct drop-in replacement for legacy Yokogawa UT350 and UT351 series controllers.

Does this controller provide an auxiliary DC loop power supply?

Yes, the UT35A-000-11-00 includes standard retransmission/loop terminals capable of supplying 15 V DC at up to 21 mA for driving standard two-wire passive process loops. For instruments requiring 24 V DC excitation, choose the /LP option code or an external power supply.