I finally managed to get the replacement pump going for the biosampler. A heating tape for the batteries and the pump keep things warm together with a layer of heavy insulation (the heating tape is not strong enough otherwise.
Furthermore I need to heat the immersion oil as the pump constantly draws -30 deg C cold air through the nozzles. Without heating, the oil freezes within 10 min. On the other hand, once the pump stops (e.g. because of empty batteries) the vial overheats quickly. So it is a delicate balance that needs to be monitored constantly.
The set-up is suitable for the MOUDI as well, but as there is not enough time left for sampling I will focus on the biosampler – I have collected 4 samples from 6 hr runs so far.
