crops automatic frost prevention controller(2)

Published:2011/7/15 20:55:00 Author:chopper | Keyword: frost prevention | From:SeekIC

The principle of circuitThe crops automatic frost prevention controller circuit is formed by electric contact mercury thermometer Q,the control circuit and ignition device and other components, which is shown in figure 4-108. 　　What's the difference between the electric contact mercury thermometer and normal mercury thermometers is that in this mercury thermometer there are two platinum electrodes,and one is inserted in the contact electrode of the upper mercury warehouse,the other is inserted in the control electrode of temperature scale which is required control. It should set the measurement temperature (smoke combustion temperature) at +1 ℃ when it is in usage.



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