Temperature switch

What is a keyword, exactly?  It can simply be any word on a webpage.  For example, I used the words intrinsic safety in a entence, making it one of the keywords for this particular webpage in some search engine's index. If the words intrinsic safety are in the subject of this webpage, it is a very useful keyword. Those keywords would actually tell a user something about the subject and content of this page.

Pressure switch products are designed for alarm, shutdown and the control of most processes and equipment. A full line of intrinsic safety is manufactured.

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