Yokogawa UT35A-004-100

Digital guide

Product Name: Yokogawa UT35A-004-100 — Digital Indicating Controller (UT35A Series, 1/32 DIN)

Product Introduction: The UT35A-004-100 is a 1/32 DIN digital indicating controller from Yokogawa’s UT35A series. It is a compact, panel-mount controller designed for single-loop control applications. The model code specifies: UT35A = Series, 004 = 4-digit display with 4 relay outputs, 100 = 100–240VAC power supply.

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Detailed content

Technical Specifications:

Product Series: UT35A Series
Model Number: UT35A-004-100
Control Mode: ON/OFF control, PID control (with optional module)
Number of Inputs: 1 input (universal)
Number of Outputs: 4 relay outputs (004 = 4 relays)
Input Signal: DC 1–5V, DC 0–10V, 4–20mA, TC (J, K, T, E, N, R, (Pt100, JPt100, Cu50)
Display: 4-digit LED display (14.2 mm digit height), Red LED
Control Accuracy: ±0.3% of F.S. + 1 digit (ON/OFF), ±0.5% of F.S. (PID)
Sampling Rate: 250 ms (typical)
Power Supply: 100–240 VAC, 50/60 Hz (100 suffix)
Output Relay Ratings: 250VAC, 3A (resistive load) or 30VDC, 3A
Communication: RS-485 (Modbus RTU) (optional)
Operating Temperature: 0°C to +50°C
Enclosure: IP65 (front panel, with cover)
Dimensions: 48 × 96 × 110 mm (W×H×D) — 1/32 DIN (48 × 96 mm)
Weight: Approximately 0.3 kg

Functional Features:

4-digit LED display with high visibility
4 relay outputs for independent control actions (heating/cooling, alarm)
Universal input accepts all major sensor types
ON/OFF control with adjustable deadband
PID control (with AI module)
2 alarm modes: High/Low alarm, Deviation alarm
Event output for state change recording
Heater burnout alarm (for heater applications)
Manual/Auto bumpless transfer
Front panel key lock for parameter protection

Performance Parameters:

Display Range: -1999 to 9999 (4 digits)
Setpoint Resolution: 1/100 of full scale (for PID)
Deadband Setting: 0 to 100% of span
Alarm Response Time: Less than 100 ms
Isolation: 1500V DC (input to output, input to power)
Power Consumption: Less than 4VA (AC), Less than 2W (DC option)
MTBF: Over 50,000 hours

Material Composition:

Front Panel: Polycarbonate (PC) with UV-resistant coating
Housing: Flame-retardant ABS resin
Terminal Block: Phoenix Contact compatible, Phosphor bronze terminals
LED Display: High-brightness red LED (7-segment, 4-digit)
Relay Contacts: AgSnO₂ (Silver Tin Oxide) for long life

Structural Features:

1/32 DIN (48 × 96 mm) panel cutout
Front panel with LED display, 4 function keys, 4 relay LED indicators
Terminal blocks at bottom for field wiring
RS-485 terminal (optional communication)
Key lock on front panel
Snap-in mounting on DIN rail or direct panel mount

Working Principle: The UT35A receives a universal process signal through its terminal blocks. The signal is conditioned and A/D converted. The controller compares the process value (PV) with the setpoint (SP) and executes the selected control algorithm (ON/OFF or PID). For ON/OFF control, the controller drives relay outputs to activate heating or cooling based on the PV-SP comparison with configured deadband. For PID control (with AI module), the controller calculates the proportional, integral, and derivative terms to drive the output. The 4 relay outputs can be configured independently for: Heating (H1), Cooling (H2), High alarm (H3), Low alarm (H4). The 4-digit LED display shows the current PV, SP, and output status.

Advantage Highlights:

Extremely compact 1/32 DIN size (48 × 96 mm) — saves panel space
4 relay outputs in one compact unit
Universal input — one device for all sensor types
High visibility 4-digit red LED display
Heater burnout alarm — built-in safety feature
Bumpless transfer between manual and auto modes
Cost-effective single-loop controller
Wide power supply range (100–240VAC)

Applicable Industries:

HVAC (heating, ventilation, air conditioning)
Food & Beverage (oven temperature control)
Chemical Plants (small tank level/temperature control)
Pharmaceutical (incubator, oven control)
Building Automation
Machine Building (OEM applications)
Water Treatment (small pump/valve control)

Model Series:

UT35A Series: UT35A-000, UT35A-004, UT35A-010, UT35A-100, UT35A-210
Output Variants:
- -000: Relay output (2 relays)
- -004: Relay output (4 relays)
- -010: Voltage pulse output (10V, 12mA)
- -100: 100–240VAC power
- -210: 24VDC power, 10mA output
Control Variants:
- Standard: ON/OFF control
- With AI module: PID control
- With A5 module: 4–20mA output