| 摘要 |
<p>PURPOSE:To know a time for feeding nitrogen gas, in a monitoring station, by computing the time for feeding the nitrogen gas based on the gas pressure in a nitrogen gas cylinder, and by information of the computed result through telephone circuit. CONSTITUTION:The input of the value of a difference between the upper limit and lower limit of the internal capacity of a gas vessel 16 and gas pressure in the gas vessel 16, to a monitoring device 42 having a micro-computer is previously provided. Besides, the input of the ON/OFF-information 96 of the air compressor 11 of a dry air feeder 10 and the gas pressure of the nitrogen gas cylinder 24 of a nitrogen gas feeder 22, to the monitoring device 42 is provided, and a time for enabling the gas to be fed by the nitrogen gas feeder 22 at the time of stopping the dry air feeder 10 is computed. The computed result is transmitted to a telephone set 54 and a terminal equipment 62 via a telephone switchboard 56.</p> |
