Download Warnings - Agilent Technologies

2
Trap and Thermal Desorption
During the next step, post-sampling, Zero Gas from the
Zero Gas port will be passed through the tube to remove very
volatile and possibly disturbing compounds from the adsorbent.
Then, the tube is heated to its desorption temperature under a
stop-flow condition. For most applications, an appropriate
temperature is T ≥160 °C (Tmax=250 °C). During the injection
step, the flow direction is inverted and the trapped components
are flushed by the transfer gas towards the Micro GC.
Afterwards, the tube is cleaned by heating it to a temperature
above the desorption temperature. The tube is rinsed with a
supply of clean air using an active charcoal filter. After cooling
to the given sampling temperature, the trap is ready for the next
measurement. See “Zero Gas” on page 23 for more information.
16
EDU Coupling to Micro GC User Manual