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A single-chip personal alarm

Posted: 31 Jul 2009     Print Version  Bookmark and Share

Keywords:personal alarm  single-chip alarm  personal monitor 

Workers in the mining industry and other industrial environments can be subject to toxic or explosive gases. They can benefit from inexpensive personal monitors. While some applications require detailed data logging and information gathering, others require merely a warning signal or alarm. This single-chip alarm circuit offers a modest level of precision and is simple and inexpensive.

Gas sensors often use a bridge configuration. Typically, the bridge output goes to an instrumentation amplifier, and then to an ADC or adjustable reference for use as an alarm or display.

This application note presents a single-chip alarm circuit that issues a warning, then an alarm, when toxic or explosive gases are sensed.

View the PDF document for more information.

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