This instructable involves the modification of a laboratory instrument powered by main voltage. If you choose to make these modifications, you will endorse the full responsibility of these modifications. The instructions described here will most likely void the warranty of your hot plate stirrer. If something goes wrong, there is a risk of major damages to properties and persons, including death.
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I recently received a safety notice from my institutional Health and Safety Department about Corning PC420 hot plate stirrer. Apparently, there is a risk that the plate will start heating by itself even if the heating button is turned off. I did a quick web search and this problem could be caused by a defective microcontroller sending a heating signal while it should not. More info is available here
This instructable will show you how to disconnect the heating element of a Corning PC420 hot plate stirrer and convert it into a stirring plate with no heating function.