Sensirion Ag

David Kiliani

Mark Hornung

Andreas Rüegg

Eric Monnin

Lukas Bürgi

Nicolas Moeller

Matthias Studer

Samuel Wehrli

Nicolas Möller

Daniel Traeutlein

Daniel Traeutelein

A thermal sensor device serves for determining a concentration of a target gas in a gas sample that further comprises a disturbance gas. The thermal sensor device comprises first and second measurement structures () comprising first and second temperature sensors (TS, TS) and a heater element () operable to cause heat transfer to the measurement structures through the gas sample. Processing circuitry provides heating power (P_) to the heater element and derives an output signal (S) based on a response of the temperature sensors to the heating power, the output signal being indicative of a concentration of the target gas in the gas sample. The first and second measurement structures have different heat dissipation capabilities, and the processing circuitry derives the output signal from a weighted difference of temperature signals from the first and second temperature sensors. Thereby, a cross-sensitivity of the output signal to a concentration change of the disturbance gas may be reduced or eliminated.

Thermal sensor device and method for determining a concentration of a target gas in a gas sample

A regulation device for regulating a mixing ratio (x) of a gas mixture comprises a first conduit () for carrying a flow of a first gas (e.g., air) and a second conduit () for carrying a flow of a second gas (e.g., a fuel gas). The first and second conduits () open out into a common conduit () in a mixing region (M) to form the gas mixture. A first sensor (S) is configured to determine at least one thermal parameter of the gas mixture downstream from the mixing region. A control device () is configured to receive, from the first sensor, sensor signals indicative of the at least one thermal parameter of the gas mixture and to derive control signals for adjusting device (V) acting to adjust the mixing ratio, based on the at least one thermal parameter.

Device for regulating a mixing ratio of a gas mixture

A thermal sensor device is configured to determine a fluid parameter of a fluid based on the heat transfer behavior of the fluid. The sensor device comprises one or more heaters and means for determining a response of the sensor device to heater power being supplied to the heaters. For detecting sensor faults, the sensor device is operated in two different modes of operation. First and second values (c, c) of the same fluid parameter are determined in the two modes. A fault indicator value (F) is derived by comparing the first and second values. The first mode of operation may be a steady-state mode, the first value (c) being based on a steady-state response of the sensor device to heater power being supplied to the heaters, and the second mode of operation may be a dynamic mode, the second value (c) being based on a transient response.

Fault detection in a thermal sensor device

The disclosure concerns a sensor device for determining the thermal capacity of a natural gas. The sensor device comprises a substrate, a recess or opening arranged in the substrate, a first heating component and a first sensing component. The first heating component comprises a first heating structure and a temperature sensor and the first sensing component comprises a temperature sensor. The sensor device is configured to measure the thermal conductivity of the natural gas at a first measuring temperature and at a second measuring temperature. The sensor device is configured to determine a first, in particular a constant, and a second, in particular a linear temperature coefficient of a temperature dependency function of the thermal conductivity and to determine the thermal capacity of the natural gas based on a fitting function. The fitting function is dependent on the first and the second temperature coefficient.

Sensor for determining the thermal capacity of natural gas

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Stäfa, Switzerland

David Kiliani