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Showing results for tags 'Vacuum'.
Background I'm working on updating some of our test equipment. The current setup uses two 20 gallon vacuum reservoir tanks, two manual needle valves per tank, 4 solenoids for tank vacuum controls, 2 differential pressure controllers with DC output, and one PLC. It also uses a very manual process for setup. My goal is to replace the main control box with two analog proportioning valves, 2 analog pressure transmitters, and one PLC with the PLC controlling the vacuum levels inside the tank automatically through data tables. I have a slightly different setup in testing right now but I'd like to get a finer control. Question What's the best way to control the process variables for two regulators using PID without creating a feedback loop and oscillation? One Valve would function as a cooling type PID (Reducing the vacuum level based on input), one valve would function as heating (Increasing the vacuum based on input)