Description and Usage of a Fast-Response Fire Suppressant Concentration Meter

This manual describes the construction and operation procedures for a Differential Infrared Rapid Agent Concentration Sensor, the DIRRACS II, a moderately hardened, compact, portable infrared (IR) absorption fire suppression agent measurement instrument developed for deployment in field experiments and certification testing. The measurement of the temporal and spatial distribution of a suppression agent is essential for characterizing the fire extinguishment process and for certifying a fire-suppression system.