VSI AS-100 Air Sampler. Measuring the gas composition and/or isotopic signature of air reveals crucial information about water use, carbon balance and greenhouse gas emissions of natural or managed ecosystems. For example, photosynthesis and respiration impart distinct isotopic signatures to the atmosphere that are used to constrain global carbon source/sink estimates and partition ecosystem fluxes.
To support these and similar measurements, we developed the VSI AS-100 Air Sampler to automatically sample ambient air into evacuated / vacuum tubes, vials, exetainers. The air sampler is both lab (220V) and field operable (12V) for highest versatility in a large range of experimental settings. Automatic sampling can be triggered according to a predefined time schedule for 24/7 measurements, or sampling can be triggered remotely - avoiding e.g. contamination by exhaled human breath. With the systems, air samples are stored in pre-evacuated, vacuum vials for later routine analyses of gas composition (with a gas chromatograph, mass spectrometer). Sample collection from the immediate vicinity occurs via needle puncture thru a septum.
An automatic vial evacuator (VSI EV-101) to evacuate/reuse vials (incl. helium flushing and a strong vacuum pump) is available as option, allowing to easily prepare "fresh" vacuum tubes both in the lab (220V) and the field (12V).
The products originate from ongoing research projects ("Iso-Drone") with academic partners. The suitability of the sampling system to measure isotopic signatures at relevant concentration of CO2 in ambient air samples has been confirmed by initial tests.