Abstract: The invention is directed to a gas sensor that includes a hotplate, a support structure, a gas selective filter, and circuitry. The support structure is configured to define a cavity. The gas selective filter is held by the support structure and spans the cavity. Various components are connected to the circuitry, and may include a temperature sensor element, a gas sensing element, and a heater. The temperature sensor element is configured to sense a temperature Tf of the filter. The gas sensing element is sensitive to a target gas in the cavity. The heater is in thermal communication with the gas sensing element. The circuitry is configured to operate the sensing element, estimate a temperature Tf of the filter, and regulate the heater. The circuitry regulates an extent to which power is supplied to the heater based on the estimated temperature Tf of the filter.

Abstract: The invention is notably directed to a gas sensor. The gas sensor basically comprises a hotplate, a support structure, a gas selective filter, and a circuitry. The support structure is configured so as define (or contribute to define) a cavity. It further supports the hotplate. The gas selective filter is held by the support structure. This filter spans the cavity. The filter may notably be designed to filter gas molecules according to their sizes. The circuitry includes one or more integrated circuits. Beside the integrated circuits, various components are connected to the circuitry. Such components include a temperature sensor element, a gas sensing element, and a heater. The temperature sensor element is arranged on or in a part of the support structure. The temperature sensor element is configured to sense a temperature Tf of the filter. The gas sensing element is arranged on or in the hotplate, so as to be sensitive to a target gas in the cavity.