wireless monitoring system of gas detector - Faculty of Electrical ...
wireless monitoring system of gas detector - Faculty of Electrical ...
wireless monitoring system of gas detector - Faculty of Electrical ...
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32<br />
iii. Step 3:<br />
(200, 2)<br />
(1000, 1)<br />
Figure 3.12: Resistance Ratio versus Concentration Gas<br />
for MQ9 [13 ]<br />
Figure 3.13 shows the graph <strong>of</strong> sensor resistance ratio (Rs/Ro) versus concentration <strong>gas</strong><br />
in ppm for MQ9. Ro is the sensor resistance (Rs) value at 1000ppm. Therefore, based on<br />
the graph above, Ro is equal to 1 (Rs/ Ro). From graph, we can get the relationship<br />
between Rs and LPG concentration in ppm. Equation 3.3 shows the relationship between<br />
Rs and LPG concentration value.
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