Patent ID: 8770215

Claim:
A low flow injector to control remote delivery of low flows of gas, comprising: a gas conduit having a proximal end and a distal end; a remote flow restrictor located at the distal end of the gas conduit to exhaust a flow of a critical process gas from the gas conduit directly into a flow of a carrier gas, wherein a mass flow of the carrier gas is provided by a mass flow controller (MFC) at a higher mass flow than the critical process gas; and an electronic regulator located at a proximal end of the gas conduit to pressurize the gas conduit at substantially the same time as the MFC provides the carrier gas to prevent backflow of the carrier gas into the gas conduit, and to adjust a pressure of the critical process gas flow through the gas conduit to the remote flow restrictor based on a pressure set point command, the pressure set point command associated with a desired mass flow of the critical process gas.