... thermometer 2.2 alarm, Relay, SSR Relay, 4-20mA output 3.96mm*48mm temperature controller Digital PID Temperature ControllerToky AI708-6 model ... most sensors,2. Two freedom degree PID arithmetic auto-tuning;3. RS485 communication, Modbus protocol can be choosed;4. Control output ... for model change;5. 2 alarm function.6. With 0.3%FS accuracy7. Relay output, SSR output and 4-20mA current ...