A longer adsorption time can be used for higher enhancement at a cost of response time. However, with Tenax TA as the absorbent, the breakthrough volume of benzene is limited, so a different choice of adsorbent might be necessary if long adsorption times are desired. For online measurements with relatively fast response, Tenax TA provided a good compromise, since it allows fast desorption at relatively low temperature for benzene. In our laboratory measurements, the repeatability of the sampling cycle was good, despite part of the adsorption taking place in varying temperature. In a more demanding measurement environment, the reliability of the sampling cycle could be improved, again at a cost of response time, by first cooling the sorbent to a set temperature before starting the adsorption phase. We also tested somewhat shorter sampling times. By reducing the duration of the adsorption phase so that the total cycle period was 1 min, the enhancement dropped to a factor of 23. With the shorter cycle, the effective adsorption time, i.e. the part of the adsorption phase where the sorbent temperature was below 80 °C, was approximately 12 s.