Patent ID: 7298280

Claim:
A gas flow monitor comprising: a housing having a fluid passage, an inlet and an outlet, the fluid passage configured to pass a gas introduced at the inlet to the outlet; a controller contained within the housing; a first indicator contained within the housing; a pressure sensitive switch in fluid communication with the fluid passage, the pressure sensitive switch having a first position indicating that the fluid passage contains at least a threshold pressure of a gas introduced through the inlet and a second position indicating the absence of a threshold pressure of a gas in the fluid passage, wherein the controller is configured to provide a first indication with the first indicator in response to the pressure sensitive switch being in the first position, wherein the housing includes a body member including the fluid passage, a first removable housing member configured to be coupled to the body member, and a second removable housing member configured to be coupled to the body member, the first removable housing member configured to receive the controller and the first indicator, the second removable housing configured to receive a portable power supply, the portable power supply being electrically coupled to the controller and the first indicator.