Digital Gas Sensor Developer Kit

Hi there, ask for help.
I use a digital sensor that is connected via UART to either a PC or a microcontroller. The sensor is certainly calibrated by setting zero and span, but when taking a value reading, the result is often past millions or negative numbers.

Hi bayuramadhan
Welcome to the Digikey forum. Can you provide the part number of the sensor you’re using and explain the application/set up you have to better understand what is happening.

Hi @Steve_Fellman, the part number is 968-038, 968-032.
I set the sensor to read gas concentration in ambient condition with targeted gas: CO, O3, NO2, SO2.
The sensors is placed into the chamber, then the gas is filled using a pump.
They have been calibrated in the lab before.

Sorry for my english.