The **TG-9B-R** is a specific model of a **Digital Temperature Controller** (often utilized in industrial heating systems, cooling chambers, or incubators). Below is a breakdown of its electronic components, technical specifications, and wiring structure. --- ### 1. Key Electronic Components The device is composed of several functional modules that work together to monitor and regulate temperature. | Component | Function | | :--- | :--- | | **Microcontroller (MCU)** | The "brain" that processes sensor input and executes PID or ON/OFF logic. | | **A/D Converter** | Converts the analog signal from the temperature probe into digital data. | | **LED Display** | Usually a dual 3-digit or 4-digit 7-segment display (Red/Green) for PV and SV. | | **Electromechanical Relay** | The switching mechanism that controls the power to the heater or cooler. | | **SMPS Unit** | Switched-mode power supply that regulates internal voltage (typically 12V/5V DC). | --- ### 2. Technical Specifications The "R" suffix typically denotes a **Relay Output** version. * **Input Types:** Multi-input (K-type Thermocouple, J-type, or PT100 RTD). * **Control Type:** PID Control (Proportional-Integral-Derivative) or simple ON/OFF. * **Accuracy:** Generally ±0.5% of full scale. * **Power Supply:** Multi-voltage (usually 100-240V AC, 50/60Hz). * **Output:** Relay Contact (Max 3A or 5A at 250V AC). --- ### 3. Connection Terminals Understanding the electronic pins is crucial for installation. A standard TG-9B-R layout includes: 1. **Power Input (Pins 1-2):** Connection for the AC mains power. 2. **Control Output (Pins 3-4-5):** The Relay contacts (Common, Normally Open, Normally Closed). 3. **Sensor Input (Pins 8-9-10):** Terminals for the Thermocouple (+/-) or PT100 (3-wire). 4. **Alarm Output:** Some models feature an auxiliary relay for over-temperature alerts. --- ### 4. Comparison: Relay vs. SSR Output The TG-9B-R is distinct from the "V" or "S" models (which use Voltage pulses for SSRs). | Feature | TG-9B-R (Relay) | TG-9B-S (SSR) | | :--- | :--- | :--- | | **Switching Speed** | Slow (Mechanical) | Very Fast (Electronic) | | **Audible Noise** | "Clicking" sound | Silent | | **Lifespan** | Limited by mechanical cycles | Longer (No moving parts) | | **Application** | Heavy-duty contactors | Precision PID heating | ---