CCR Process Products’ Model 400 powers, controls and communicates with four mass flow controllers simultaneously. A +/-15V at 250mA supply is available per MFC. The unit accepts 0-5V, 0-10V or 4-20mA input signals and sends similar setpoint control signals. Flowrate, Totalizer, Units of Measure and Gas ID displays are user-selectable. Ratio control and RS232/485 serial communications are standard. A single-channel model is also available.