Downhole oxygen concentration detection circuit

Downhole oxygen concentration detection circuit

Shown is an underground oxygen concentration detection circuit , which can be used in underground operating environments to detect the oxygen concentration in the air.
The oxygen concentration detection sensor in the circuit converts the detection result into a DC voltage. After passing through the circuit amplifier ICl-1 and the voltage comparator ICl-2, it drives the transistor
and rri, and then \rri drives the relay. After the relay operates , the contacts are connected. The buzzer will sound to remind people that the oxygen concentration is too low and draw people's attention.