First of all, a highest possible gas flow, without cooling the sample, should be used.

Next, the gas should be established and reach and pass the sample in a uniform manner, so that the step in the gas composition is maintained. Dead ends and pockets should be avoided at any stage. If the sample is a disk on a support tube, it is best to supply the gas simultaneously to both electrodes via the gas supply tubes in the normal manner. Ensure that as much as the sample area as possible has free access to the gas.

If the sample is a bar sample or is otherwise not covering a support tube top, we still suggest to supply gas via the two gas supply tubes in the normal manner.

For more information see the ProboStat manual.