Ar SB MQ-131 Ozone sensor Oxygen sensor module MQ131
 
Specific parameters:
1. Size: 32mm X22mm X27mm length X width X height
2. The main chip: LM393, MQ-131 gas sensor
3. Working voltage: DC 5V
 
Features:
1. With signal output indicator light indication;
2. Dual signal output (analog output and TTL level output);
3. The TTL output effective signal is low level; (the signal light is on when the low level is output, and it can be connected to the IO port of the single-chip computer)
4. The analog output increases with increasing concentration, the higher the concentration, the higher the voltage;
5. High sensitivity to ozone gas, (detection concentration range 10PPB-2PPM)
6. Long-term service life and reliable stability;
7. Fast response recovery characteristics;
8. With mounting holes to facilitate fixed installation;
9. The probe can be plugged and unplugged to facilitate testing.
 
Application:
Ozone gas detection device used in home and atmospheric environment,
 
Following conditions must be avoided:
Water Condensation Indoor conditions, slight water condensation will effect sensors performance lightly. However, if water condensation on sensors surface and keep a certain period, sensor’s sensitivity will be decreased.
Used in high gas concentration. No matter the sensor is electrified or not, if long time placed in high gas concentration, it will affect sensors characteristic.
Long time exposed to adverse environment. No matter the sensor electrified or not, if exposed to adverse environment for long time, such as high humidity, high temperature, or high pollution etc, it will effect the sensors performance badly.
Vibration Continual. Vibration will result in sensors down-lead response then repture. In transportation or assembling line, pneumatic screwdriver/ultrasonic welding machine can lead this vibration.
Concussion. If sensors meet strong concussion, it may cause its lead wire to disconnect.
 
Resources: 
1. MQ131 Datasheet 
2. MQ131 Ozone Gas Sensor Module
3. DIY Air Quality Monitor – PM2.5, CO2, VOC, Ozone, Temp & Hum Arduino Meter
4. Arduino-MQ131-driver