| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas supply control device 20 which makes it possible to supply oxide gas securely by warming appropriately according to circumstances of use. SOLUTION: A gas supply control device starts up a warning mode setting process when a user himself operates to push PSW 65 for longer than five seconds in succession. A mute mode notifies the user an alarm by, instead of an alarm sound by a buzzer circuit 27, oxide gas supplied with pulses generated by repetition of opening and closing an electromagnetic valve 31, or by vibration of a vibrator generated by a vibration output circuit 28. This enables the user optionally to set up the alarm as to with or without sound. Thus, under the circumstances filled with silent atmosphere, such as a musical hall, a theater and a library, the user can know the alarm without disturbing others by oxide gas supplied with pulses, for example air deflation sounds, through a nose cannula 50, or by vibration by the vibrator.
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