Closed Loop Controlled Liquid Dosing System

Inhalt:
We present an approach for a low cost liquid dosing system. The innovation is based on a smart combination of a thermal mass flow microsensor with commercially available low cost components. The system operates at 0.5-20ml/min volume flow rate and 0-100kPa back pressure. It enables a volume flow with significantly reduced pulsation and a low standard deviation of < 1%. The energy consumption is below 1W. High quality dosing systems usually are high priced. In contrast low cost systems show a high output mass flow pulsation and a low accuracy. Goal of our approach is to offer a significantly improved accuracy and small pulsation at low costs.