[RETIRED] MQ9 gas sensor - CO and flamable gases

5.00/5 Read 1 customer reviews
SKU: 101284
Out of stock
Retired Product

This product has been retired from our shop and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.


Out of stock

Notify me when back in stock

Product Description

This product is retired and we won’t sell it anymore. This page is for reference only.



Gas sensor MQ9 detects the presence of CO (Carbon Monoxide), CH4 (Methane) and LPG in the air. The best results are given while compounds are in liquid form, however, it still does an amazing job when measuring in gas form. It needs a bit of time to warm up in order to work correctly.


Product features

Key features

  • Detects: CO(Carbon Monoxide), CH4(Methane), LPG
  • Voltage: 5V
  • Digital(HIGH/LOW) and analog(0V-5V) output
  • With LM393 comparator
  • Comes with soldered 4-pin male header
  • Dimensions: 32 x 22 x 27 mm / 1.3" x 0.9" x 1.1"

Customer reviews & ratings

  • 5.00 out of 5
  • 5 stars
  • 4 stars
  • 3 stars
  • 2 stars
  • 1 star
Write a customer review

1 reviews

Sort by

Show only reviews in English (0)

Be the first to review “[RETIRED] MQ9 gas sensor – CO and flamable gases”
5 out of 5
by Bruno K. on July 08, 2019

The gas sensor MQ9 contains a small heater with a consumption of ≤350mW. It needs a short warm-up time to work properly. Detects: carbon monoxide with a minimum concentration of 10-1000ppm. Methane and Propane concentrations 100-10000ppm. It can also detect other flammable vapors and gases. You can connect the analog output via the analog pin to the ADC of the Dasduino/Arduino. Digital output with LM393 comparator to ordinary GPIO.