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Digital Temperature Controller – AI- 7981

The AI-7X81 Series is a high-precision PID Digital Temperature Controller designed for industrial temperature control applications. It supports multiple thermocouple and RTD inputs, offers PID and ON-OFF control modes, and features a bright dual LED display with relay or SSR output options for reliable heating and cooling control.

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Features
  • Overshoot control & hysteresis adjustment

  • User lock code for parameter protection

  • Relay life expectancy: up to 5,00,000 operations

  • Operating temperature: 0°C to 50°C

  • Humidity: 5–90% RH (non-condensing)

  • ABS plastic housing

  • Panel-mount sizes available

Technical Specifications

DESCRIPTION AI-7481 AI-7781 AI-7981 AI-7681 AI-7881
1. DISPLAY TYPE : Dual 4- Digit 7 segment LED
Display Specification 4 Digit Bright White (PV) | 4 Digit Luminous Green (SV)
Display height (PV) 0.36″ 0.56″ 0.80″ 0.36″ 0.36″
Display height (SV) 0.24″ 0.39″ 0.56″ 0.36″ 0.36″
STATUS LED’S OP 1 : Main Control Output
2. INPUT
Sensor input TC : J,K,R,S,N,T,B | RTD : Pt-100
Sensor Type Range Resolution Accuracy
Fe-k(J) T/C 0 ~ 760°C 1 °C ± 1 °C
Cr-AL(K) T/C -99 ~ 1300°C 1 °C
(R) T/C 0 ~ 1700°C 1 °C
(S) T/C 0 ~ 1700°C 1 °C
TC – N -99 ~ 1300°C 1 °C
TC – T -99 ~ 400°C 1 °C
TC – B 0 ~ 1800°C 1 °C
Pt-100(RTD) -100 ~ 450°C 1 °C
Pt-100(RTD 0.1) -99.9 ~ 450.0°C 0.1 °C ± 0.3 °C
Sampling Time / Digital Filter 125 msec. | 1 to 10 Sec.
CJC for TC / LWC for Pt-100 Built in automatic | Built in upto 18E max.
3. RELAY OUTPUT
Contact type / Rating N/O, CM, N/C | 5A @ 250VAC or 30 VDC
Life expectancy / Isolation > 5,00,000 operations | Inherent
4. SSR DRIVE OUTPUT
Drive Capacity / Isolation 12V @ 30mA | Non-Isolated
5. FUNCTION
Output 1 / Control Action Main Control output | ON-OFF/PID (Select)
Control Mode Heat/Cool (Select)
6. ENVIRONMENTAL, 7. POWER SUPPLY & 8. PHYSICAL
Operating Range / Humidity 0 ~ 50°C, 5~90% Rh | 95% Rh (Non-condensing)
Supply Voltage / Consumption 90~270VAC, 50/60Hz | 4W Maximum
Housing Material ABS Plastic

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