... Relays and Thermocouples. PID temperature controller / PID process control thermostats We specialize in manufacturing Temperature Controllers,thermostat, ... Refrigeration Controllers,Digital Time Relays and Thermocouples. PID fuzzy control, P, PI, PD, PID, or on/off ... J-CD701 intelligent PID digital controllers adopt advanced micro-process technology, RS485 interface, small size, and powerful anti ...