During the development of high H2S gas wells in the eastern Sichuan Basin

there exists a high potential risk in some gas wells due to H2S

so a kind of wellsite H2S detecting system is designed.In the hardware part

the hardware circuit takes STC 12C5A60MCU as the core chip

mainly including signal regulation circuit

data acquisition circuit and communication circuit.In the software part

software is programmed by C language and LabVIEW.It is verified through test that the measurement system error is less than 0.2%

which satisfies the needs for high precision measurements.