Abstract: When constructing ozone sensor one should considerdynamics of circuit inputs and of circuit itself. Thatdynamics is related to heat capacity conductivity ofsensors substrate and case. Physical parameters aredescribed as an implicit functions but we can usesimplified model to resolve input space. Duringmeasurement stochastic parameters like humidity, mediumtemperature, medium flow velocity should be observed,due to their influence on heat conductivity andconvection. When PID controller with two state outputwas used to stabilize temperature, regardless ofconstant input parameters at system output appearedbinary noise. That phenomenon is related to temperaturesensitivity of semiconductor layer which is higher thansensitivity of PID controller. That sensitivity causesamplification of controller output signal changes.Solution of that problem are physical models basedestimators.!2
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