Hi guys, i’m using an HCHO sensor to detect toluene, benzene, alchool and formaldehyde concentration. I’d like to know the single concentration for each gas but I don’t understood how. Can you help me, please?
Hi @LTodini72,
You first need to calculate the Rs/R0 value, you can find the information here at the WiKi Page. Then refer to the sensitivity characteristic diagram below and find the gas concentration.
Warning
The sensor value only reflects the approximated trend of gas concentration in a permissible error range, it DOES NOT represent the exact gas concentration. The detection of certain components in the air usually requires a more precise and costly instrument, which cannot be done with a single gas sensor. If your project is aimed at obtaining the gas concentration at a very precise level, then we do not recommend this gas sensor.
Tip
Seeed released the Seeed Gas Sensor Selection Guide, it will help you choose the gas sensor that best suits your needs.