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The 250E-4-A Gas Inlet Pressure and Flow Control Module features four set points and a simple analog error meter to show deviation of actual versus desired set point. A ground closure will select one of four preset set points. This self-contained PID control module is designed to provide optimized control of the total pressure or flow of a gas (or gases) in a dynamic closed-loop system. With the 250E, input can be supplied by a Baratron® Capacitance Manometer or other compatible vacuum gauge for closed-loop pressure control, or flow input can be measured by a mass flow transducer for closed-loop flow control. Its power supply has sufficient output to power most capacitance manometers and flow transducers. Process control can be manually adjusted through a front panel potentiometer or remotely programmed with a 0-5 VDC analog signal for profile generating.