PURPOSE: To confirm the mistake of the concn. of carbon dioxide even when the mistaken concn. of carbon dioxide is calculated for some cause by simultaneously outputting the calculated concn. of carbon dioxide and the exactitude thereof. ;CONSTITUTION: After a power supply is closed and the warming-up of a carbon dioxide sensor 101 is performed, the detection signal from the sensor 101 is sent to a reference value correcting means 1 and a carbon dioxide concn. calculating means 103. The correcting means 1 takes in the signal from the sensor 101 and calculates a reference value calculating the concn. of carbon dioxide from the past signal history at every definite time to send the same to a reference value storage means 2. The memory means 2 renews and stores the reference value to send the same to the concn. calculating means 103. The concn. calculating means 103 receives the detection signal of the sensor 11 and the reference value to calculate the concn. of carbon dioxide to send the same to a carbon dioxide concn. output means 104. An exactitude calculating means 3 calculates the exactitude of the calculated carbon dioxide concn. value to send the same to the output means 104. The output means 104 outputs the concn. of carbon dioxide and the exactitude thereof at the same time to confirm the mistake of the concn. of carbon dioxide.;COPYRIGHT: (C)1994,JPO&Japio
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