Libratherm offers digital temperature indicator / controllers available in abs enclosure in three different sizes. These are low cost, accurate, rugged and reliable digital temperature indicator / controllers offered as on/off or time proportional control, for general purpose temperature control applications. On/off control is the simplest controlling method. When used for heating control the temperature sensed by the connected sensor is compared with the set point and when the temperature exceeds this set point, the heater is put off. When the temperature again drops below the set point, the heater is turned on. So, depending upon the heating system design, inertia due to heat, the heat absorption by process or the natural losses, the temperature will oscillate above and below the set points by few degree. When the application is for or water circulating valves are turned off, when temperature drops below the set point and turned on when the temperature rises above the set point. Where steady state control is desired, the time proportional control is more suitable. In this controlling method, the heater is continuously turned on and off at the fixed rate called cycle time within in the proportional band defined above and below the set point. This is done to feed the correct amount of power to the heating system to maintain the temperature exactly at the set point. The fine tuning is achieved by front panel bandand reset control. Some of the above models are also available in suitable size weather proof and flameproof enclosures for use in the hazardous environment.
The features of the digital temperature indicator are:
Elegant appearance and compact in size.
Accurate and sturdy in operation.
Accuracy better than ± 0.5 % of the full scale.
Very easy to operate.
Accepts standard type of thermocouple or rtd - pt-100.
Control output relay or triac or dc pulse for external ssr.
Uses high quality potentiometer and membrane switch for adjusting the set points.
Application :
Heat treatment
Furnace / oven control
Food processing
Constant temp. Baths,
Environmental chambers
Plastic / packaging / pharma industry
Cold storage and chilling plants
Laboratory equipment etc.
