MQ-138 formaldehyde toluene sensor module

SKU: FA3098 Tag:
Weight 0.018 kg
Dimensions 3.5 × 3 × 2.5 cm
Main Chip

LM393, MQ138 formaldehyde sensor

Working Voltage



  • Has a signal output LED indicates.
  • The dual signal output (analog output, and TTL level output).
  • TTL output valid signal is low; (low level output signal light, which can be accessed microcontrolle r IO port).
  • Analog output increases with the concentration, the higher the concentration the higher the voltage.
  • Aldehydes, alcohols, ketones, aromatic compounds with high sensitivity.
  • Has a long life and reliable stability.
  • Rapid response recovery characteristics.
  • With mounting holes to facilitate fixed installation.


  • Size(LxWxH): 35mm x25mm x30mm
  • Main Chip: LM393, MQ138 formaldehyde sensor
  • Working Voltage: DC 5V

The formaldehyde gas sensors module output TTL level signal (the) such as 51 microcontroller IO port and voltage analog signals, the other module can detect aldehyde/benzene class/aromatic ketone, etc. Consistency test data error and belongs to the mid-range level. Applied to the qualitative judgment and quantitative test of the affirmative. The VOC and TVOC gases interference cross data more apparent.

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