Main Components
Temperature sensors (RTD / Thermistor / Thermocouple)
Controller unit (digital display)
Relay output / control signal (for pump, valve, fan)
🔹 Types of Delta Temperature Controllers
1. ON/OFF Controller
Simple operation
Turns device ON or OFF
2. PID ΔT Controller
More precise control
Used in industrial processes
3. Differential Thermostat
Common in HVAC & solar systems
Maintains a fixed temperature difference
🔹 Applications
1. Solar Heating Systems
Controls circulation pump
Prevents heat loss
2. HVAC Systems
Chilled water ΔT monitoring
Coil performance checking
3. Heat Exchangers
Maintains efficient heat transfer
4. Boilers & Cooling Systems
Ensures proper temperature difference
5. Industrial Processes
Chemical and thermal control systems
🔹 Advantages
Saves energy
Prevents unnecessary operation
Improves system efficiency
Reduces equipment wear
🔹 Important Settings
Set ΔT (ON point) → e.g., 10°C
Differential / Hysteresis → e.g., OFF at 5°C
Sensor calibration
Delay time (optional)
🔹 Real Example in HVAC (Chilled Water)
Supply water = 7°C
Return water = 12°C
ΔT=5°C
