... 3. RS485 Digital temperature recorder AI508-4 (48mm*48mm) model temperature controller with following features: a. TC/RTD/analog signal ... ; b. display, alarm and adjust function, c. advanced two freedom degreePID arithmetic, d. PID auto-tuning for different system ... ), e. option control output, modularization design, f. high anti-interference, 110-240V AC/DC, one alarmapplicable to system tempreature ...