There is provided herein a breath sampling device comprising a controller adapted to initiate a signal to trigger a valve functionally associated with a breath sampling tube upon said controller receiving a signal indicating a blockage in the breath sampling tube. The valve is adapted to facilitate an increase of pressure within the breath sampling tube between the blockage and a pump functionally associated with the breath sampling tube. There is further provided herein an airway adapter comprising a restrictor located in proximity to a connection point between the airway adapter and a breath sampling tube, wherein the restrictor may be adapted to reduce the flow rate of liquids entering the breath sampling tube. There is further provided herein an airway adapter comprising one or more openings located near a connection point between said airway adapter and a breath sampling tube, wherein said one or more openings are adapted to allow inflow of air to reduce the flow rate of liquids entering the breath sampling tube.
