Liquified Petroleum Gas Sensor MQ-6

MQ-6 LPG & Propane Sensor
The sensor relies on a Tin Dioxide (SnO_2) sensing layer. When the internal heater warms the element, the sensor reacts with combustible gas molecules in the air. This chemical reaction lowers the electrical resistance of the sensor, which is then translated into an analog voltage.

Why it’s a Gas Safety Essential:
• LPG Specialization: The MQ-6 is the most accurate choice for detecting leaks from LPG cylinders and propane tanks. Its sensitivity curve is optimized for these specific carbon-heavy gases.
• Rapid Response: It features a very fast recovery time, meaning once the gas is cleared from the area, the sensor returns to its "clean air" baseline quickly, allowing for immediate re-testing.
• Dual Output Utility:
* Analog (A0): Provides a 0V to 5V signal proportional to the gas concentration. This is vital for determining the size of a leak.
* Digital (D0): Acts as a high-speed switch. You can adjust the sensitivity using the onboard potentiometer to set a "danger zone." Once crossed, the pin goes HIGH to trigger an alarm.
• Cost-Effective Protection: It offers industrial-grade sensitivity at a hobbyist price point, making it accessible for both DIY home safety and small-scale commercial monitoring.

Technical Capabilities:
• Detection Range: 200 ppm to 10,000 ppm.
• Operating Voltage: 5V (Required to power the internal heating element).
• Power Consumption: Approximately 150mA.
• Internal Comparator: Uses the LM393 chip to provide a clean digital signal for microcontrollers.

Best For:
The MQ-6 is the primary sensor for bottled gas leakage alarms, portable propane detectors, caravan/RV gas monitors, and industrial gas storage facility safety.