Ozonometer based on Metal-Oxide Sensors and its Graduation

The method and the instrument are considered for measuring the ozone concentration in the ozone-air mixture, which are based on a change in the resistance of a sensing element of the MQ131 metal-oxide sensors depending on the humidity and temperature of the medium. A general regression relationship is proposed taking into account the joint effect of the temperature and humidity, as well as the ozone concentration on the resistance of the sensitive semiconductor layer of the sensors. The experimental concentration meter (ozonometer) is developed with a compensation unit allowing for joint influence of temperature and humidity of the ozone-air medium. The results of tests of the developed ozonometer are given, and the data are compared with the results of iodometric and standard instrumental measurements using the calibration ozonometer based on the spetrophotometric method. The iodometric and instrument graduation of the ozonometer is conducted; the regression relationship describing the change in voltage at the sensor output depending on the ozone concentration is proposed.

References

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