MQ7 Gas Sensor CO ppm calibration method

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

I have the MQ7 gas sensor. Do you know of a way to calibrate it to get approximate ppm CO readings? The datasheet is unclear on this. For comparison, the MQ135 sensor has straightforward calibration and examples are available online, but I cannot find the same for this sensor.

Original message (Croatian)

nastavno na prošli mail,
Ova komponenta:
https://e-radionica.com/hr/mq7-senzor-plinova.html Znate li za neki način za kalibraciju istoga da bi se dobio (približni) ppm CO plina? U datasheetu je dosta nejasno. Recimo kod senzora MQ135 je jednostavna kalibracija i može se naći online, za ovaj senzor ne mogu naći.

Hvala unaprijed,
[name removed]

Originally submitted via the contact form on soldered.com on 16 February 2021. Migrated to the forum for community visibility.

2

Soldered Support:

The MQ series sensors are not capable of delivering precise ppm readings. They should be used more as an indicative factor of particles in the air, providing a qualitative measure of CO levels rather than numerical values - for example: low, medium, high.

Original message (Croatian)

nažalost ne, predlažem Vam da od MQ serije senzora ne očekujete precizna ppm očitanja, s obzirom da oni to nisu sposobni izbaciti. Trebali bi se koristiti više kao orijentacijski faktor čestica u zraku koji bi mogao označavati s količinom CO u zraku koja nije brojčana, npr: malo, srednje, visoko.