Public Lab Research note

MiCS-2614 Ozone sensor schematic

by filimon_k | December 14, 2015 03:20 14 Dec 03:20 | #12512 | #12512

This is the current circuit we are using for our MiCS-2614 Ozone sensors.

We are generally getting good results, with voltage dropping from nearly 5v across the sensing circuit, to below 2v at around 500ppb ozone concentrations. But there can be considerable variation from unit to unit.

We are registering sensitivity at concentrations below 100ppb, but our ozone monitor isn't registering these lower concentrations, so calibration may prove to be tricky.


We are using a board which is an adapter for the footprint of the obsolete Mics-2610 sensor. Manufacturer info is here. The pinout of this footprint is below, with pins 1 and 3 being the heating circuit, and the measurement circuit is through pins 2 and 4.

The adapter manufacturer is here



Could you please share me the source code to measure Ozone level in the air. I want to calculate the concentration in ppb. At the moment, I just get the value that read from analog pin. Moreover,you proposed the circuit with 820 ohm and 10K Ohm. But in this link, you request to add 100K Ohm, which one is correct?

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I am also interested. We use 6.8k as a load resistor in our design, but this seems to be way too low.

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