Crunch

Member Since: December 18, 2009

Country: United States

  • Product SEN-09403 | about 4 years ago

    I have the MQ-7 and I only see a wiring diagram for the MQ-135. Looks similar. Also, I can’t really see any indicator that shows A vs. B sides – they look symmetrical – can they be wired either way. What does it mean to heat for 48 hours? Is this for calibration? Appears that the sensitivity is 200ppm, which is pretty high – for firefighting, we measure in the single digits (I’m making my own CO detector for our department). Is there a better sensor out there?

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