Abstract: In some embodiments, a method of operating a gas sensor includes setting power to a heater in contact with a MOx sensor to provide a temperature that is below a threshold temperature; holding the temperature below the threshold temperature for a period of time to reduce ozone concentration in a gas sample in contact with the MOx sensor; increasing power to the heater to increase the temperature of the MOx sensor to an operating temperature; acquiring resistance data from the MOx sensor at the operating temperature; and processing the resistance data to provide a result related the gas sample.

Abstract: In some embodiments, a method of operating a gas sensor includes setting power to a heater in contact with a MOx sensor to provide a temperature that is below a threshold temperature; holding the temperature below the threshold temperature for a period of time to reduce ozone concentration in a gas sample in contact with the MOx sensor; increasing power to the heater to increase the temperature of the MOx sensor to an operating temperature; acquiring resistance data from the MOx sensor at the operating temperature; and processing the resistance data to provide a result related the gas sample.

Abstract: An arrangement is provided for controlling the heating temperature in a semiconductor gas sensor comprising a control loop, consisting of a heating resistor as automatic control system of a measurement device measuring a physical quantity representing the temperature of the heating resistor, and an actuating unit controlling a power supply of the heating resistor, and a method which utilizes the arrangement.

Abstract: In an assembly for signal transfer between a receiving station and a transmitting station and for power supply of the transmitting station where these two stations are connected via a two-wire line, an analog signal current variable between two limiting values is transmitted via this two-wire line, this signal current representing a measured value sensed by a sensor. This current also forms the supply current needed to operate the transmitting station. In the transmitting station a circuit is provided, generating a constant operating voltage for the transmitting station. The transmitting station includes a controllable current source which dictates the current flowing via the two-wire line as a function of the measured value. A charge pump is connected to the output of the current source, the charge pump generating from the voltage appearing at the output of the current source all the operating voltage needed for operating the sensor and a signal processing circuit connected thereto.

Abstract: For discrete-time reactance measurement the reactance is activated by a clocked generator device with an electric voltage, an electric current or an electric charge. A clocked analyzer device generates an output signal as a function of the reactance to be measured from discrete-time sampling values of the electric voltage, electric current or electric charge. The generator device and the analyzer device are clocked in synchronism, the clock controlling the generator device and the analyzer device being varied in the same way by a frequency or phase modulator for reducing the influence of narrowband disturbances coupled into the circuit caused by aliasing.