Hi,
I am trying to bulid a high accuracy alcohol detector, Am now using MQ-03, and found that its responsing slightly for other gases, Can anybody suggest any high sensitivity alcohol sensor, or Can i improve the sensitivity using Mq 03.

 

http://www.breathalyzer.net/

 

I can give you my ex-wifes Email.

 

Hi,
I am trying to bulid a high accuracy alcohol detector, Am now using MQ-03, and found that its responsing slightly for other gases, Can anybody suggest any high sensitivity alcohol sensor, or Can i improve the sensitivity using Mq 03.

Are you worried about specificity or sensitivity? If sensitivity, how sensitive do you need it to be? Are you committed to the MQ-03 or can you consider other technologies?

John

 

Yes i give importance to the sensitivity, Need to use other sensor..?

NEED TO SENSE ALCOHOL ONLY...

 

Yes i give importance to the sensitivity, Need to use other sensor..?

NEED TO SENSE ALCOHOL ONLY...

I am assuming that by "alcohol" you mean ethanol (ethyl alcohol) specifically, not the whole class of alcohols or related aldehydes and ketones. It appears you want both improved specificity (i.e., detect ONLY ethyl alcohol) and improved sensitivity (i.e., you want to detect lower levels of ethanol).

Is that assumption correct? If so, what level of sensitivity in mg/L do you need? BTW, here is a link to the datasheet at SparkFun: https://www.sparkfun.com/datasheets/Sensors/MQ-3.pdf

If you are considering using it in a breath analyzer, then compounds like benzene and hexane are unlikely to be present. But acetone may be present.

John