Introduction: The PORTER P2000i Series Liquid Mass Flow Controller is designed to address the need for fast, precise control of low liquid flow rates. The compact package size of the P2000i Series simplifies system integration. Clean room assembly and all metal seal construction ensure high purity and leak integrity. A unique thermal measurement system yields accurate measurement with less than a 5°C increase in fluid temperature. Exclusive control circuitry, combined with a piezoelectric-actuated control valve, provides fast, stable control at low flow rates. The P2000i Series also includes a Liquid Mass Flowmeter for applications where flow control is not a necessity.