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December 17, 2009
News - New Product Friday: Happy…
about 2 months ago
Fuel cells tend to be ethanol specific while the solid state sensors respond to a variety of chemicals. (possibly including acetone, which can be a product of the human body)
Devices like this one: http://www.repcomarketinginc.com/Pages/default.aspx are used for calibration of BAC interlocks and police grade instruments.
The test solution is a mix of water and ethanol with approximately the same percentage of ethanol as the blood you’re trying to simulate. (I’d think it would be exactly the same, but it’s claimed to be different by an amount that is a trade secret)
The simulator heats the fluid to 34 degrees C, stirs it, and has a tube with holes so air can be blown into the bottom of the jar. There’s a tube drawing air from the space above the liquid that is attached to the unit under test.
News - SparkFun Joining in Cyber…
about 3 years ago
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