regulerer trykpumpen PB, mens FC3 regulerer partikelprøvetagningssystemet (figur 14) og derved indstiller systemets indad- og udadgående strømme, således at det ønskede delingsforhold og fortyndingsforhold i fortyndingstunnelen DT opretholdes.
controls the pressure blower PB, while FC3 controls the particulate sampling system (Figure w), thereby adjusting the flows into and out of the system so as to maintain the desired exhaust split and dilution ratio in DT.