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UD1BG3-045N-1KC-2TA-A

The Yokogawa UD1BG3-045N-1KC-2TA-A is a highly advanced Single-Input Intelligent Signal Conditioner from the Yokogawa UTAdvanced series.
This "smart" DIN-rail mounted unit is designed for critical temperature monitoring applications. It provides high-performance electrical isolation, signal linearization, conversion, and alarm functionality. The complex suffix code defines its precise configuration: it is set up to accept a Resistance Temperature Detector (RTD) input signal (specifically from a Pt100 sensor), convert it into an isolated 4-20 mA analog output, and provide two independent SPDT alarm relays. The -A suffix indicates a 24V DC power supply.

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Key Parameters:
| Category | Specification |
| ：--- | :--- |
| Series | Yokogawa UTAdvanced (UTA) |
| Function | RTD (Pt100) Input Isolator with Dual Alarms |
| Input Signal | Resistance Temperature Detector (RTD) |
| RTD Type | Pt100 (100Ω at 0°C) |
| Wiring | 2-wire, 3-wire, or 4-wire connection (configurable for lead wire resistance compensation) |
| Default Temperature Range | Common default range: 0 to 100°C or 0 to 200°C (Fully user-configurable) |
| Output Signal | Analog, 4 to 20 mA DC (isolated, linear to temperature) |
| Number of Alarms | 2 independent alarms |
| Alarm Type | SPDT Relay (Form C) contacts |
| Relay Rating | Typically 250V AC, 2A (resistive load) |
| Power Supply | 24V DC |
| Isolation | Input-to-Output-to-Power-to-Relays: 1500 V AC (Full isolation) |
| Accuracy | Typically ±0.1% of span (high accuracy) + RTD measurement uncertainty |
| Linearization | Built-in for Pt100 RTD characteristic curve (IEC 60751 standard) |
| Configuration | Configurable via front-face buttons and LCD display. Settings include RTD type, temperature range, output range, alarm setpoints (HI, HI-HI, LO, LO-LO, etc.), hysteresis, and damping. |
| Operating Temperature | -20 to +70°C (-4 to +158°F) |
| Mounting | Standard DIN rail (35mm) |
| Status Indicators | LCD display for temperature values and status; LEDs for power, alarm status, and communication. |

Typical Application
This module is ideal for critical temperature monitoring with alarm functionality:

Input: A Pt100 RTD is installed in a reactor vessel to measure process temperature.

Processing: The conditioner measures the sensor's resistance, linearizes it, and converts it to a precise temperature value.

Output: A 4-20 mA signal proportional to the temperature (e.g., 4mA = 0°C, 20mA = 200°C) is sent to the DCS or PLC for control.

Alarm 1: The first relay triggers a HI alarm if the temperature exceeds a safe operating limit (e.g., 180°C).

Alarm 2: The second relay triggers a HI-HI alarm (e.g., at 190°C) to initiate an emergency cooling sequence or shutdown.