Gas monitoring device for gas chromatograph

A gas monitoring device for gas chromatograph, comprising:

• a pump configured to draw out a gas from a space in a column oven of the gas chromatograph;
• a measurement flow path through which the gas drawn out of the space in the column oven by the pump flows;
• a gas sensor having a sensing unit exposed to an inside of the measurement flow path, the gas sensor being configured to detect a specific component in the gas flowing through the measurement flow path;
• a flow rate detection unit including a self-heating element arranged in the measurement flow path, the flow rate detection unit being configured to acquire a signal corresponding to a flow rate of the gas flowing through the measurement flow path by controlling a voltage applied to the self-heating element so that a temperature of the self-heating element is kept constant at a reference temperature;
• a temperature acquisition unit configured to acquire temperature information about the gas flowing into the measurement flow path;
• and
• a controller configured to control operations of the pump and the flow rate detection unit,
• wherein the controller is configured to
• set the reference temperature of the self-heating element of the flow rate detection unit to a temperature of the gas flowing into the measurement flow path based on the temperature information acquired by the temperature acquisition unit and
• determine normality of the operation of the pump based on the signal acquired by the flow rate detection unit,
• the gas monitoring device for gas chromatograph further comprising:
• a correlation data holding unit configured to hold correlation data indicating a correlation between the temperature of the gas flowing into the measurement flow path and a temperature to be set as the reference temperature of the self-heating element, and
• wherein the reference temperature is configured to be determined using the temperature information acquired by the temperature acquisition unit and the correlation data held in the correlation data holding unit.