| 摘要 |
<p>The temperature sensor is a temperature dependent resistor (26) and lies between a first pair of resistors (12, 11) connected in series in a loop of the through pipe for the water. There is a second pair of resistors connected in series (10, 9) with a second temperature dependent resistor (29) between them. The two temperature dependent resistors are connected in series. To reduce the amount of heating when the desired temperature is reached a relay switch (20) is used which is controlled by a regulating apparatus connected to the triac. A three-phase supply is used, with the first pair of resistors connected to the S and T terminals.</p> |
