Patent ID: 7971604

Claim:
An apparatus for delivering a molar quantity of gas, comprising: a memory configured to store a gas-specific-delivery-profile prior to initiating gas delivery, the gas-specific-delivery-profile cotemporaneously including a plurality of valve indicators that define (i) a plurality of valve positions between an open position and a closed position for a variable valve over a delivery time window and (ii) a specific molar quantity of the gas; and a processor configured to receive an indication of a molar flow rate of the gas and a request for the specified-molar-quantity of the gas, and in response to the request for the specified-molar-quantity and the indication of the molar flow rate, the processor is configured to control the variable valve in accordance with the gas-specific-delivery-profile and the molar flow rate so as to deliver the specified-molar-quantity of the gas during the delivery time window.