... Refrigeration Controllers,Digital Time Relays and Thermocouples. PID temperature controller / PID process control thermostats We specialize in manufacturing Temperature ... Relay, SSR, 4-20mA ). RS485 J-CD701 intelligent PID digital controllers adopt advanced micro-process technology, RS485 interface, ... than 5 VAControl algorithms options P, PI, PD, PID, or on/offAlarms Upper limit alarm, lower limit ...