| 摘要 |
<p>PURPOSE:To perform stabilized food storage without influence by span gas or air entered in the calibration or filter exchange, by providing a control means to ignore the gas concentration signals from the gas monitor until a blower has been operated for a specified time to completion. CONSTITUTION:When a gas monitor 45 is to be calibrated or a filter exchanged, the switch 48 fitted on said monitor 45 is turned 'ON'. The signals from the switch 48 then enters the input terminal of a sequencer 49. And the sequencer 49 closes change-over valves 41, 42, 50, 51 to isolate a storehouse 1, combustion furnace 12 and absorption devices 22, 23 from a gas monitor 45 and chamber 46 during the switch 48 is 'ON'. When the calibration or filter exchange has been done, the switch 48 is turned 'OFF'. The sequencer 49 then opens the changeover valves 41, 42, 50, 51 to open the pipe to the storehouse and operate the blower 14 for a specified time, thus sufficiently replacing the span gas or air left in the gas monitor 45 and chamber 46 with the gas in the storehouse to effect unaffected state.</p> |
