Crops Automatical Frost Protection Control Circuit

Published:2011/5/11 1:24:00 Author:Robert | Keyword: Crops, Frost Protection, Control | From:SeekIC

The circuit's working principle is shown below.This crops automatical frost protection control circuit is made up by electrical-contact mercury thermometers Q, control circuit and ignition component and other components which is shown in the picture below.The difference between the electrical-contact mercury thermometers and general mercury thermometers is that this kind thermometers's mercury cavity has been inserted two platinum button electrodes. One is inserted in the upside of the thermometers mercury cavity as a contactor electrode, and the other is inserted in the temperature scale line which need to be controlled as a control electrode. When using this device it should adjust the monitoring and control temperature (combustion smoke temperature) to be +1℃.The control circuit is made up by thyristor VT, resistance R1, R2 and capacitor C.The ignition component is made up by 2.5V little lamp HL and gunpowder etc. First to extract two lines from the two electrode of the little lamp HL, and also use fine sandpaper or fine grinding wheel to rub a small hole in the top of HL glass ball. Then insert some gunpowder from the small hole into the grass ball. Using a appropriate size plastic membrane to wrap up the small lamp HT, and there are about 20g gunpowder in it as the detonator for smoke material. When using this device, accumulate the smoke material on the detonator, and put some soil on the smake material to prevent the burning of smoke material starter.



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