The invention relates to the technical field of
toxic gas monitoring, in particular to a limited space operation environment
gas monitoring device which comprises a shell, a controller and an audible and visual alarm, a gas cavity is formed in the shell, a pushing
assembly, a detection
assembly and a sealing
assembly are arranged in the shell, and the pushing assembly comprises an air cylinder, a through hole and a pushing plate; the detection assembly comprises a
servo motor and a
rotating disc, a plurality of air storage cylinders are arranged on the circumference of the
rotating disc, harmful gas sensors are arranged in the air storage cylinders, the sealing assembly comprises a mounting plate and a water through hole, a
micro motor, a baffle a and a baffle b are arranged in the mounting plate, an air inlet and a water inlet are formed in the mounting plate, and a
piston is arranged in the water through hole. The air cylinder drives the push plate to push air in the
air cavity into the air storage cylinder to be detected through the harmful gas sensor, when the push plate descends, the
micro motor drives the baffle a and the baffle b to seal the air inlet, and meanwhile, the
piston squeezes water in the water through hole into the position between the baffle a and the baffle b to be further sealed, so that the detection result is more accurate.