The **E5GN-R2HT** is a compact, high-performance temperature controller manufactured by **Omron**. It belongs to the E5GN series, which is specifically designed for space-saving panel installations (1/32 DIN size). --- ## 1. Technical Specifications The E5GN-R2HT features specific internal electronics that define its functionality: | Feature | Specification | |:---|:---| | **Form Factor** | 1/32 DIN (48 x 24 mm) | | **Control Output** | **Relay Output** (SPST-NO, 250 VAC, 2 A) | | **Input Type** | Thermocouple or Platinum Resistance Thermometer (Universal) | | **Power Supply** | 100 to 240 VAC, 50/60 Hz | | **Auxiliary Outputs** | 2 points (Relay outputs for alarms) | | **Control Method** | ON/OFF or 2-PID control (with auto-tuning) | --- ## 2. Key Electronic Components & Functions ### A. Input Stage (Signal Conditioning) The device uses a high-precision Analog-to-Digital Converter (ADC). It supports various sensors: * **Thermocouples:** K, J, T, E, L, U, N, R, S, B, W, or PL II. * **RTDs:** Pt100 or JPt100. * The electronic circuitry includes **Cold Junction Compensation (CJC)** to ensure accuracy when using thermocouples by measuring the ambient temperature at the terminal block. ### B. Control Logic (The CPU) The "brain" of the E5GN is a microprocessor capable of **2-PID control**. * **Auto-tuning:** The electronics monitor the system's thermal response and automatically calculate the Proportional (P), Integral (I), and Derivative (D) constants. * **Non-volatile Memory:** Settings are stored in EEPROM, ensuring parameters are saved even during power loss. ### C. Output Electronics (The "R" in R2HT) The "R" signifies a **Relay Output**. * Unlike Voltage output (SSR drive) or Current output (4-20mA), this model uses a physical mechanical relay. * **Life Expectancy:** The internal relay is rated for approximately 100,000 operations (electrical) at the rated load. ### D. Display and Interface * **Dual Display:** Uses high-visibility LED segments to show the PV (Process Value) in red and SV (Set Value) in green. * **Keys:** Membrane switches for environmental protection (IP66 front panel). --- ## 3. Terminal Configuration The wiring terminals on the back are organized as follows: 1. **Power Supply:** Terminals for 100-240 VAC input. 2. **Control Output:** Relay contacts (Terminals for the heating/cooling load). 3. **Alarm Outputs:** Two independent relay paths for triggering external sirens or safety cut-offs. 4. **Sensor Input:** Specific terminals for + and - (Thermocouple) or A, B, B' (RTD). --- ## 4. Safety and Protection * **Isolation:** The electronics provide reinforced insulation between the power supply, input, and output circuits. * **Hysteresis:** Adjustable electronic hysteresis to prevent "chattering" of the relay when in ON/OFF mode.