MQ-3 solid-state gas and alcohol vapour sensor + potentiometer

The MQ-3 sensor is extremely sensitive to the presence of alcohol in the air, while also demonstrating high immunity to interference from petrol, smoke and vapour. It is ideally suited to detect a range of alcohol concentrations, making it an ideal choice for projects requiring precise air quality analysis, such as alcohol detectors in vehicles or portable monitoring devices. It is equipped with two types of outputs: digital (D0) with adjustable threshold via a potentiometer, which can be easily integrated into microcontrollers or Arduino start-up kits, and analogue (A0), which combined with the input of anA/C converter allows a more accurate determination of alcohol concentration. The MQ-3 sensor combines long life, low cost and simplicity of installation, making it an attractive solution for a variety of process applications. Specification:

* supply voltage 5V

* digital and analogue output

* measurement: breath alcohol concentration

* measuring range: 0.04-4mg/l alcohol

* operating temperature: -10 to 50 °C

* dimensions: 33mm x 20mm