MQ3 gas sensor accuracy for alcohol detection

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

I’m thinking about purchasing an MQ3 sensor to use with my Croduino board. I’d like to use the sensor for a university project.

I’m interested in knowing what the accuracy of the sensor is if I want to use it as a breathalyzer. Is there a formula used to detect the amount of alcohol in breath?

Original message (Croatian)

Razmišljam si o kupnji senzora MQ3 koji bih koristio sa svojom Croduino pločicom. Kupio bi senzor u svrhu projekta koji radim za faks.

Zanima me znate li kolika je preciznost senzora ako se želi koristiti senzor kao policijski alkotest? Ima li neka formula koja se koristi kako bi se otkrila količina alkohola u dahu?

Originally submitted via email support on 17 May 2018. Migrated to the forum for community visibility.

2

Soldered Support:

It is possible to use the MQ3 sensor to measure the alcohol level, but I must point out right away that calibration will be very inconvenient and will require alcoholic beverages.

Ultimately, you will never be able to use this sensor as a breathalyzer, but rather get some kind of information about the alcohol level, for example on a scale from 0 to 10.

Original message (Croatian)

hvala Vam na upitu!

Moguće je koristiti MQ3 senzor da bi se mjerila razina alkohola, ali moram odmah napomenuti da će kalibracija biti vrlo nezgodna i zahtijevati će alkoholna pića :))

Konačno, nikada nećete moći koristiti ovaj senzor kao alkotest, nego više dobiti nekakav info o razini alkohola, recimo na skali od 0 do 10.