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An upgrade to the ATLAS silicon tracker cooling control system may require achange from C3F8 (octafluoro-propane) to a blend containing 10-30% of C2F6(hexafluoro-ethane) to reduce the evaporation temperature and better protectthe silicon from cumulative radiation damage with increasing LHC luminosity.Central to this upgrade is a new acoustic instrument for the real-timemeasurement of the C3F8/C2F6 mixture ratio and flow. The instrument and itsSupervisory, Control and Data Acquisition (SCADA) software are described inthis paper. The instrument has demonstrated a resolution of 3.10-3 forC3F8/C2F6 mixtures with ~20%C2F6, and flow resolution of 2% of full scale formass flows up to 30gs-1. In mixtures of widely-differing molecular weight (mw),higher mixture precision is possible: a sensitivity of < 5.10-4 to leaks ofC3F8 into the ATLAS pixel detector nitrogen envelope (mw difference 160) hasbeen seen. The instrument has many potential applications, including theanalysis of mixtures of hydrocarbons, vapours for semi-conductor manufactureand anaesthesia.

A Combine On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyzer for The ATLAS Silicon Tracker