Maxwell DR04D is a din rail mount PID temperature controller, 4 channel configuraitons, support thermocouple inputs(K,E,J,N,W,S,T,R,B), and output can be Relay, SSR Drive, or analog like 4-20mA, 0-10VDC, PID or ON/OFF control mode, RS-485 modbus communication as standard features, 24VDC source for greater saftey, auto/manual control switchable, when you have a sensor failure, the system can be quickly switched to manual control mode to maintain the temperature, soft-start and run/stop features.