GAS ANALYSIS SAMPLING WITH OVERLOAD DETECTION

A gas sampling device suited for e.g. sampling of exhaled breath from a subject in a sorbent tube (T) with volatile organic compound (VOC) from a gas sample (G_S) received at a gas inlet (G_I). A gas circuit (GC) provides a flow path from the gas inlet (G_I) to a port (P) where the sorbent tube (T) is connected, so as to allow the gas sample (G_S) to load the sorbent tube (T). A VOC detector (DT1) in the flow path serves to detect VOC concentration during the sampling process. A control module (CM) continuously calculates a measure of cumultative sum of VOCs based on the output from the VOC detector (DT1), and this measure is then compared with a predetermined threshold value (TH). When the measure exceeds the threshold value (TH), the control module (CM) generates an output (O), and the sampling process is then preferably stopped accordingly, e.g. by controlling a pump or value in the flow path to stop gas flow in response to the output (O). Such device can eliminate the problem with overloading of sorbent tubes, which leads to invalid gas measurements that needs to be redone. Thus, the device can save time, costs, and risks.