NEO Monitors LaserGas II Single Path (SP) Compact Monitor is a compact, highly reliable gas analyser for true continuous in-situ monitoring. SP Com- pact Monitors are optimised for short distance measurement across pipes and along short cells. Due to its focused laser beam the SP Compact can mea- sure through very thin nozzles (< 10 mm diameter). Thus, for applications with continuous purge to prevent dust from settling on the windows the SP Compact will require very small purge flow.