| 摘要 |
<p>Temp. regulator of electric drying kiln has temp. converted to voltage by means of a thermo-element and passed to a galvanometer. The pointer of the galvanometer is provided with a vane. A photo-electric light barrier consists of a light source, one or more photo-resistors and a control set. The control set comprises a triac. and a capacitor, and is connected to the photo-resistor and one or more potentiometers, thus forming a phase shifter. The photo-resistor and the two potentiometers are in series and parallel to the photo-resistor. If the photo-resistor is exposed sufficiently, the control set switches to 100% efficiency.</p> |
