Abstract: A gas analysis apparatus for measuring the concentration of a gas component in a first space. The apparatus comprises a sealed measurement space, of which at least one wall portion consists of a separation wall which exhibits ionic conduction. The concentration of the gas component in the measurement space is changed periodically between two values by filling and pumping currents at the separation wall. The time intervals are measured and are a measure of the concentration. However, these time intervals comprise a "dead time" caused by switch-on and switch-off (both electrical and physical) transients. When given time intervals are combined by addition and subtraction, the influence of dead times can be considerably reduced.

Abstract: A temperature sensor including an oscillator circuit comprising a plate-shaped quartz crystal resonator formed using a cut rotated singly through an angle .theta. about the X axis, .theta. being in the range -29.degree. to -16.degree. or +39.degree. to +45.degree.. Electrodes are provided on the major surfaces of the resonator to make the resonator vibrate in a thickness shear mode at a frequency which varies substantially linearly in a selected temperature range.