GAS METER

PROBLEM TO BE SOLVED: To accurately integrate measured values of minute flow rate and to stably display numerical values of the minute flow rate displayed on a display device. SOLUTION: A calculation part 50 of a gas meter includes a forward and reverse determination circuit 60, a flow rate calculation circuit 70, a memory part 80 and a display drive control circuit 90. The memory part 80 includes a cumulative flow rate counter 120 for storing the gas flow rate, and an auxiliary cumulative flow rate counter 130. The flow rate calculation circuit 70 adds a measured instantaneous flow rate q to the minute flow rate cumulative value stored in the auxiliary cumulative flow rate counter 130, and if this added minute flow rate cumulative value reaches a set value (the upper limit value β) or higher, the value (cumulative flow rate), which is obtained by subtracting the upper limit value β from the minute flow rate cumulative value, is added to the cumulative flow rate value of the cumulative flow rate counter 120, and in this case the minute flow rate cumulative value renewed and stored in the auxiliary cumulative counter 130 is β. COPYRIGHT: (C)2011,JPO&INPIT