Comments (1)
I don't have an MQ131 close to me at the moment to perform a test and I never took the measure in V.
The sampled value depends on the ratio RL on R0 and those R values are computed through the Ohm's law and the voltage. So, I will say that the voltage doesn't matter as far as the sensor is behave in the same way during calibration (R0) and during sampling (RL).
You can also check the input voltage to ensure that the input voltage on the VCC (not the heater) is consistant with your expectations. My experience is that the cause of the issue is often on the input voltage ;-).
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