| 摘要 |
An apparatus for monitoring a gas supply connection to a mechanical breathing aid has an in-line housing containing a measurement chamber for receiving gas from the gas supply and a transceiver arrangement) operable to emit acoustic energy into and to detect emitted acoustic energy propagated through the measurement chamber. A comparator is operably connected to the transceiver arrangement to receive therefrom a signal dependent on an amplitude of detected energy and generates a control signal from a comparison of the received signal with a reference signal indicative of a target gas usable by a flow control valve, also located within the housing, to inhibit a gas flow through the breathing aid if a gas other than the target gas is present. |
