Gas sensor

A gas sensor comprising:

• a sensor part configured to generate a gas detection signal in accordance with a concentration of a gas to be measured;
• and
• a control circuit configured to generate an output signal indicating the concentration of the gas to be measured based on the gas detection signal,
• wherein the control circuit is configured to correct the output signal so that the output signal indicates a concentration of the gas to be measured higher than that indicated by the gas detection signal when a level of the gas detection signal output from the sensor part is less than a reference value corresponding to a level of the gas detection signal which is normally obtained when a concentration of the gas to be measured is a concentration value in normal time, and
• wherein, when a change in the level of the gas detection signal output from the sensor part indicates a decrease in a concentration of the gas to be measured in a period when the level of the gas detection signal output from the sensor part is less than the reference value, the control circuit is configured to reflect the decrease in the output signal within a range not less than the concentration value in normal time.

A gas sensor comprising:

• a sensor part configured to generate a gas detection signal in accordance with a concentration of a gas to be measured;
• and
• a control circuit configured to generate an output signal indicating the concentration of the gas to be measured based on the gas detection signal,
• wherein the control circuit is configured to correct the output signal so that the output signal indicates a concentration of the gas to be measured higher than that indicated by the gas detection signal when a level of the gas detection signal output from the sensor part is less than a reference value corresponding to a level of the gas detection signal which is normally obtained when a concentration of the gas to be measured is a concentration value in normal time, and
• wherein the control circuit is configured to calculate the reference value every time the control circuit takes in the gas detection signal.