Thank U Riva & DC42
what if I would just map the values? Pls inspect my assumption.
like this one,
int sensorValue = analogRead(A0);
int partspermillion = map(sensorValue, 205, 818, 0, 2000);
a support from telaire told me that 1V=205bits and 4V=818bits
since the sensors sensitivity is from 0-2000ppm
can this method be accurate?