• Libratherm Instruments Private Limited

PID Controllers - Single and Two Loops

Libratherm offers four new models of PID Controllers, Model PID-723, PID-966, PID-948 and PID-489. These are designed and developed using the latest micro controller chip and programmed with the time tested and field proven PID algorithm. PID controllers are mainly used for precise process control. Unlike On/Off type of oscillatory control, PID control action gives smooth and steady state control. These models offer all the useful features required to control the complex system.

These controllers accept factory set single or dual fixed input or user selectable universal input. The control action is user selectable as PID or On/Off for both direct and reverse or Heat and Cool actions. Control outputs are given in the form of optically isolated DC pulse to drive external SSR, Triac or AC SSR to operate AC operated load, electro mechanical relay and/or linear analogue output. The analogue output levels can also be configured for (0-20) mA or (4-20) mA or (0-5) / (0-10) volt using the front panel key board, in brief, PID-723, PID-948 and PID-489 provides 4 switching outputs and 2 analogue outputs whereas PID-966 provides 6 switching and two analogue outputs. Both Auto and manual tuning of PID values makes the controller versatile and user friendly. The model PID-723,PID-948 and PID-489 being small in size, can easily be accommodated in small size equipments. One Ramp/Soak function allows user to gradually increase the set value and hold the process value for desired soak time.