| 摘要 |
PURPOSE:To display the abnormality and others of a flowmeter, by transmitting a unit integrated flow rate pulse and various informations of the flowmeter itself containing an integrated flow rate value at a predetermined time cycle through the same line. CONSTITUTION:The pulses outputted from a display device 13 for a definite period at a predetermined cycle are supplied to an inverter 18 through an NPN transistor TrO1 and a line 17 and applied to a gas meter 10 while the polarity thereof is reversed. Whereupon, the meter 10 generates and outputs a unit integrated flow rate pulse to turn TrO2 ON and sends out the same to the display device 13. When the display device 13 outputs a high level signal continuously for a definite period during the next period, the meter 10 changes over the transmission mode of the unit integrated flow rate pulse to the transmission mode of various informations of the meter 10 itself and the display device 13 also changes over a receiving mode to display the read informations such as the gas leakage, excessive flow rate and power source abnormality of the meter 10 and the flow rate data integrated by the meter 10.
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