Abstract: In a breathing apparatus and a method for the operation thereof, a gas monitor monitors at least one gas and includes a pump that controls a sidestream flow from a patient circuit to the gas monitor via a sampling line having a first end connectable to the gas monitor and a second end connectable to the patient circuit. At least one pressure sensor measures a pressure at the sidestream gas monitor and provides a first pressure signal indicative of the measured pressure. A processor determines if a leakage is occurring in the sampling line based on the pressure signal.

Abstract: The disclosure relates to detection of leakage in a sampling line of a breathing apparatus, which comprises a gas monitor (102) for monitoring at least one gas, including a pump (106) for controlling a sidestream flow to the gas monitor (102), connectable to a mainstream of a patient circuit (108); a sampling line (110) for the sidestream flow, having a first end (112) being connectable to the gas monitor (102) and a second end (114) being connectable to the patient circuit (108); and at least a first pressure sensor (118) for measuring a pressure at the sidestream gas monitor (102), in operation providing a first pressure signal for the pressure; and a processing unit (120) operative to determine if a leakage of the sampling line (110) is occurring based on at least the first pressure signal.