The temperature controllers of the TDR 4020 series, which work with a microprocessor, are characterized by their high control accuracy. The controller is designed for mounting on a mounting rail. Digital 4-digit display of the actual value and simultaneous display of the setpoint. Range, input type and control function can be selected via the keyboard. Control function: heating/cooling, three-point control and continuous control. PID self-optimization (autotuning), soft start - time-temperature profile. When ordering, two items must always be specified, control unit and sensor.