MQ3 Alcohol Sensor

Specification

• Sensitivity: 0.05 to 10 mg/L of alcohol
• Operating voltage: 5V DC
• Power consumption: 800mW
• Load resistance: adjustable from 1 to 10 kΩ
• Heater resistance: 33Ω ± 5%
• Heater current: 150mA ± 20mA
  
• Operating temperature: -10°C to +50°C
  
• Dimensions: 32mm x 22mm x 27mm

Description

The MQ3 alcohol sensor is a semiconductor gas sensor that is sensitive to alcohol vapors. It can detect alcohol concentrations in the range of 0.05 to 10 mg/L, making it suitable for breath alcohol testing and other alcohol detection applications.

Here are the technical specifications of the MQ3 alcohol sensor:

– Sensitivity: 0.05 to 10 mg/L of alcohol
– Operating voltage: 5V DC
– Power consumption: 800mW
– Load resistance: adjustable from 1 to 10 kΩ
– Heater resistance: 33Ω ± 5%
– Heater current: 150mA ± 20mA
– Operating temperature: -10°C to +50°C
– Dimensions: 32mm x 22mm x 27mm

The MQ3 alcohol sensor uses a small heater element to heat the sensing element, which is made of a metal oxide semiconductor material. When alcohol vapors are present, they react with the sensing element, causing its resistance to change. The change in resistance is measured and used to determine the alcohol concentration.

It is important to note that the MQ3 alcohol sensor is sensitive to other gases besides alcohol, such as propane and methane, and can produce false readings if exposed to these gases. It is recommended to calibrate the sensor regularly and use it in combination with other sensors to improve the accuracy of alcohol detection.