Discharge ionization detector

A method for adjusting a discharge ionization detector including:

• a gas passage through which an electric-discharge gas is to be passed;
• a plasma generation electrode configured to generate an electric discharge in the gas passage so as to generate plasma from the electric-discharge gas in the gas passage by the electric discharge;
• a collection electrode provided in the gas passage and configured to collect charged particles generated from a sample component in a sample gas with the plasma;
• and
• a bias electrode configured to generate an electric field for guiding the charged particles to the collection electrode,
• wherein the method comprises:
• a step of setting a bias-electrode voltage, which is a DC voltage applied to the bias electrode, to 0 V under the condition that the sample gas is not introduced into the gas passage;
• a step of adjusting a collection-electrode voltage, which is a DC voltage applied to the collection electrode, so that a signal output obtained from the collection electrode under the condition that the bias-electrode voltage is set at 0 V has the same sign as the charge of the charged particles to be detected;
• and
• a step of changing the bias-electrode voltage to a value previously specified as a voltage for a sample measurement.

A method for adjusting a gas chromatograph device including:

• a column;
• a detector configured to detect sample components separated from each other by the column;
• and
• a chromatogram creator configured to create a chromatogram based on an output signal from the detector,
• the detector being a discharge ionization detector including:
• a gas passage through which an electric-discharge gas is to be passed;
• a plasma generation electrode configured to generate an electric discharge in the gas passage so as to generate plasma from the electric-discharge gas in the gas passage by the electric discharge;
• a collection electrode provided in the gas passage and configured to collect charged particles generated from a sample component in a sample gas with the plasma;
• and
• a bias electrode configured to generate an electric field for guiding the charged particles to the collection electrode,
• wherein the method comprises a step of adjusting a collection-electrode voltage, which is a DC voltage applied to the collection electrode, so as to reduce an abnormality in a peak shape on the chromatogram created by the chromatogram creator, while performing a sample analysis using the gas chromatograph device.