The microprocessor PID controller of the SR90 series is used in temperature, humidity, level, flow, etc. control systems. It has two displays - the measured value (PV) and the set value (SV). The control takes place in relation to the set value based on the EXPERT PID algorithm, which protects the process against overshoots and increases the control accuracy. The controller has the Autotuning function, i.e. automatic selection of PID parameters to the application in which it works. Wide possibilities of hardware and software configuration allow for use in many industrial applications. On the other hand, a very clear and simple menu makes the controller suitable also for the simplest tasks.