Brooks Instrument”s B-Series mass flow controller is designed to be insensitive to fluctuations in pressure and temperature. Built on a standard 1.125-inch wide platform with a user interface and local digital display, the mass flow controller provides a compact flow measurement and control solution that actively measures line pressure and adjusts the control valve to eliminate actual flow and flow signal changes as a result of pressure fluctuations. In addition, the output of the mass flow controller is characterized over the full operating temperature range of the device, enabling measurement and control accuracy regardless of process or ambient temperature conditions. The mass flow controller incorporates internal self-diagnostic routines that continuously check the health of the device. In the event of a diagnostic fault, an alarm code flashes on the user interface. A service port provides additional diagnostic capability, minimizing the need to remove the mass flow controller from process service.