Natural Gas, NG Sensor

Natural Gas Sensor

Research:

• There are at least two brands of MQ sensors Winsen and Hanwei with datasheet differences.
  • Hackaday.io: MQ-4 Buyer Beware
  • Strange, Zhengzhou Winsen Electronics Technology Co., Ltd. is a subsidiary of Hanwei Electronics Group Corporation. ref
  • Looking at an eBay seller, the data they present doesn't match either of these :(
  • Lacking a precision calibration environment and the sensor's sensitivity to a group of gases, these sensors can only function as a general indicator of a collection of gasses present.
• Blogger "One Transistor"
  • Compute ppm of MQ sensors from datasheet graphs
    • The author uses WebPlotDigitizer to extract numerical data from pdf datasheet.
  • Influence of temperature and humidity on MQ gas sensors
  • References cited are good.
• Arduino Sketches and Libraries to look through
  • An excellent tutorial. With this, the datasheets make a lot more sense. Understanding a Gas Sensor
  • Missing - apply temperature and humidity compensation to the measured resistive results. However, no one else has done it either.
• A collection of the MQ series datasheets
• Most of the search engine results that come up are for the MQ parts.
• I found an obsolete sensor in a broken CO Alarm TGS-203. This never showed up in my previous searches. This pdf offers more insight into what is going on.

Other references:

• MQ-5 circuit
• MQ-5 datasheet
• MQ-5 Combustible Gas Sensor Interfacing with Arduino
• Gas leakage module using the MQ-5 gas sensor
• TGS 2611C00 datasheet
  • Info
• MQ-4 Methane Natural Gas Sensor ADC121C 12-Bit ADC I2C Mini Module
• MQ-4, DFRobot Product details
• Interesting stuff on Davide Gironi's blog
  • MQ gas sensor correlation function against temperature and humidity
  • MQ gas sensor correlation function estimation by datasheet
  • Cheap CO2 meter using the MQ135 sensor with AVR ATmega