Important Note:

"Fourtech" is often a branding found on generic industrial PID temperature controllers (frequently manufactured by companies like Xiamen Yudian or other OEM manufacturers in China). These units are often functionally identical to the Yudian AI-518 or AI-720 series.

PV (Process Value):

Before diving into the settings, familiarize yourself with the interface. Most Fourtech models feature: Displays the current temperature. SV (Set Value): Displays your desired target temperature.

Control Mode:

Choose between Heating (H) or Cooling (C) depending on your equipment. 3. Advanced Features to Know

Part 4: Common Parameter Settings (The "Hidden" Menu)

  • Terminals 1 & 2: Power Supply (e.g., 100-240V AC or 24V DC). Check your specific manual voltage!
  • Terminals 3, 4, 5: Sensor input. For a thermocouple: connect to terminals 4 (+) and 5 (-). For an RTD: connect to 3, 4, and 5.
  • Terminals 6 & 7: Control output (Relay or SSR driver).
  • Terminals 8 & 9: Alarm 1 output.

If you can't find the manual, here are some general features and operations common to many temperature controllers:

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