El circuito de la figura puede ser usado como alarma de temperatura, pues el relé dispara cuando la temperatura sobrepasa cierto valor ajustado en P1. Una posibilidad de uso interesante es como termostato en el control de estufas, caso en el que usaremos los contactos NC del relé. El relé es activado cuando la temperatura alcanza el valor ajustado. Como estamos con los contactos NC en serie con el sistema de calentamiento, el mismo desconecta en este punto. La inercia del sensor permite que los intervalos entre conexiones y desconexiones sean grandes, de modo que no haya problemas de desgaste de contactos del rele y también se consiga mantener la temperatura del ambiente en limites estrechos de valores. Recordamos que cada par de contactos del relé indicado soporta 2A, lo que quiere decir que en estufas de cierto porte es preciso emplear un relé adicional de mayor corriente o incluso un triac. El NTC usado (resistor con coeficiente negativo de temperatura) debe tener una resistencia a la temperatura ambiental (o normal en el ajuste) de 10k a 20k. Para valores mas altos, se puede alterar P1 para 100k o incluso 220k, según el sensor elegido.

 


 

 

 

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