Patent ID: 11940099
Assignee: BPR MEDICAL LIMITED
Field: Medical technology (Instruments)
Classification: CPC F  A | IPC A  F

Claim 16:
17. A gas flow alarm method comprising:
configuring a device to introduce back pressure into a flow of gas;
providing a supply sensor configured to determine whether supply flow to the device is enabled;
providing a pressure sensor configured to determine whether the flow of gas through the device has developed back pressure;
providing a bleed orifice, in fluid communication with a flow outlet, configured to allow free passage of gas through the bleed orifice at a flow rate less than a lowest flow rate provided for a supply control which enables gas flow to the device;
determining from signals received from the supply sensor and the pressure sensor whether the supply flow to the device is enabled and whether the flow of gas through the device has developed back pressure; and
if the supply flow to the device is not enabled or the flow of gas through the device has not developed back pressure, activating an alarm condition.