The **W2TS-311-R2** is a specific model within the **W2TS series of Digital Temperature Controllers**, typically manufactured by companies like **Hanyoung Nux** or similar industrial automation providers. These devices are designed for precise thermal management in industrial environments. --- ### 1. Core Technical Specifications The W2TS-311-R2 is characterized by its input/output configuration and its physical form factor. | Feature | Specification | | :--- | :--- | | **Control Type** | ON/OFF Control or Proportional Control | | **Input Type** | Thermocouple (K, J) or RTD (Pt100Ω) | | **Output Type** | **Relay Output** (indicated by the "R" in the suffix) | | **Power Supply** | 100 - 240V AC (50/60 Hz) | | **Display** | 3-Digit or 4-Digit LED (Process Value/Set Value) | | **Dimensions** | Usually 72(W) x 72(H) mm or 48(W) x 48(H) mm (DIN Standard) | --- ### 2. Key Electronic Components & Internal Architecture The device functions through a series of integrated electronic stages: #### A. Input Stage (Sensor Interface) * **Analog-to-Digital Converter (ADC):** Converts the millivolt signal from a thermocouple or the resistance change from an RTD into a digital signal. * **Cold Junction Compensation (CJC):** An internal thermistor that compensates for the temperature at the controller’s terminals to ensure accurate thermocouple readings. #### B. Control Logic (Microcontroller) * **MCU:** The "brain" that compares the Process Value (PV) against the Set Value (SV). * **Hysteresis Logic:** In ON/OFF mode, the MCU applies a "dead band" to prevent the relay from "chattering" (rapidly switching) when the temperature is exactly at the set point. #### C. Output Stage (Power Control) * **Electromechanical Relay:** The "R2" designation specifically refers to the relay contact output. This acts as a physical switch to turn a heater or cooler on and off. * **Rating:** Typically rated for 250V AC / 3A or 5A (Resistive Load). --- ### 3. Connection Terminal Guide The rear of the unit features a terminal block usually mapped as follows: 1. **Power Terminals:** Connection for AC mains power. 2. **Sensor Terminals:** * For **Thermocouples**: Polarized (+ and -). * For **RTD (Pt100)**: Usually 3-wire (A, B, b) to compensate for lead wire resistance. 3. **Output Terminals:** Common (COM), Normally Open (NO), and sometimes Normally Closed (NC) contacts for the relay. --- ### 4. Common Applications * **Plastic Processing:** Controlling heat in injection molding machines. * **Food Industry:** Maintaining oven or fryer temperatures. * **Packaging:** Heat-sealing bars for plastic bags. * **HVAC:** Industrial cooling or heating system regulation.