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Abstract. The iDirac is a new instrument to measure selected hydrocarbons in theremote atmosphere. A robust design is central to its specifications, withportability, power efficiency, low gas consumption and autonomy as the otherdriving factors in the instrument development. The iDirac is a dual-columnisothermal oven gas chromatograph with photoionisation detection (GC-PID).The instrument is designed and built in-house. It features a modular design,with the novel use of open-source technology for accurate instrument control.Currently configured to measure biogenic isoprene, the system is suitablefor a range of compounds. For isoprene measurements in the field, theinstrument precision (relative standard deviation) is ±10 %, with alimit of detection down to 38 pmol mol−1 (or ppt). The instrument wasfirst tested in the field in 2015 during a ground-based campaign, and has sinceshown itself suitable for deployment in a variety of environments andplatforms. This paper describes the instrument design, operation andperformance based on laboratory tests in a controlled environment as well asduring deployments in forests in Malaysian Borneo and central England.

iDirac: a field-portable instrument for long-term autonomous measurements of isoprene and selected VOCs