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


5000 in stock


  • 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.


There are no reviews yet.

Be the first to review “MQ-138 formaldehyde toluene sensor module”

You may also like…