A gas detector especially adapted for use with gas chromatographs contains two capillary tubing electrodes through which a gas flows. The inner ends of the electrodes are coaxial and are separated by a gap. The outer end of one of the electrodes forms a gas inlet. The gas detector also contains a coaxial dielectric tube spaced apart from and surrounding the electrodes axially, a means for applying a sufficient voltage across the gap between the electrodes to create a discharge within the gas, and a means for measuring a change in properties of the gas as it passes through the gap between the electrodes.
