3
$\begingroup$

I made a breathalyzer using a MiCS-5524 gas sensor. I would like to calibrate it so it can be close to accurate. e2v technologies — MiCS Application Note 4, Using MiCS Sensors for Alcohol Detection (PDF) shows a method of heating an alcohol/water solution and testing the air that has been bubbled through the mixture.

If I was to heat a liter of alcohol/water solution to 37 °C, what ratio of alcohol to water would I need to make the air have 10 ppm of alcohol? I don't have much experience with chemistry so please keep that in mind when you explain the solution.

Improve this question
$\endgroup$
3
  • 2
    $\begingroup$ Now this is a case where experimenting on humans does not sound inhumane. Why not use your body as a test input? $\endgroup$
    – Ivan Neretin
    Oct 5, 2022 at 5:39
  • 1
    $\begingroup$ @IvanNeretin Human bodies are difficult to be adjusted to produce breath with 10 ppm of ethanol. :-) Unless evaluated side by side by the DIY and commercial tester. Then the particular ethanol content is not important. $\endgroup$
    – Poutnik
    Oct 5, 2022 at 7:25
  • $\begingroup$ I've done that already to see if it detects alcohol on my breath but its still hard to calculate a fairly precise ppm by just drinking some booze and blowing after a half hour. I was hoping to get a more precise read out so it'll work on persons of different heights and weights. $\endgroup$
    – Bill2k
    Oct 7, 2022 at 3:12

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.