MQ-2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke or Propane. Due to its high sensitivity and fast response time, measurement can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer.
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? 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.
Longtime storage
The sensor?s resistance produces reversible drift if it?s stored for a long time without electrify, this drift is related to storage conditions. Sensors should be stored in airproof without silicon gel bag with clean air. For the sensors with long time storage but no electrify, they need long aging time for stability before using.

Longtime exposed to an adverse environment
No matter the sensors electrified or not, if exposed to the adverse environment for a long time, such as high humidity, high temperature, or high pollution etc, it will affect the performance of the sensor badly.

Vibration
Continual vibration will result in sensors down-lead response then rapture. In transportation or assembling line, pneumatic screwdriver/ultrasonic welding machine can lead to this vibration.

Concussion
If sensors meet strong concussion, it may lead its lead wire disconnected.
Application:

The domestic gas leakage detector
Industrial Combustible gas detector
Portable gas detector