How to Precisely Control Head Pressures of Liquids with Clippard's Cordis Series
In this video, Doug Robertson, Director of Research, provides a demonstration of how Clippard's Cordis line of electronic proportional pressure controllers are an ideal choice for precisely controlling the head pressures of liquids for either static or dynamic systems.
Video filmed at Clippard in Cincinnati, Ohio
Hi, I’m Doug Robertson, Director of Research at Clippard and I’m going to share with you how the Clippard Cordis line of electronic proportional pressure controllers are an ideal choice for precisely controlling the head pressures of liquids for either static or dynamic systems with volumes as small as 4 mL, up to greater than 10 mL, and a variety of pressure ranges from vacuum up to 1 psig, 15 psig, 30 psig, even greater than 150 psig depending on your application. In the following video demonstration one Cordis controller is being used, along with Clippard pinch valves, to control the feed and harvest drive pressure of two separate liquid channels into and out of a 200 mL system. A second Cordis controller is being used to accurately maintain the head pressure over that 200 mL system at 1 psig, even while media is being fed or harvested from the system by the drive controller. As you watch the upper left syringe barrel, a pinch valve has been opened in the channel, then the Cordis pressure controller to the left is creating differential drive pressure so that we’re slowly accelerating the feed of the fluid to a peak flow into the 200 mL system.
If we stop the video briefly, you’ll notice that the drive pressure shown on the left gauge has ramped to 1.5 psig, while the head pressure shown by the center gauge continues to be held steady at 1 psig, providing 0.5 psig of steady differential drive pressure to feed fluid into the 200 mL system barrel. Next, you’re going to see the same drive controller to the left smoothly ramp drive pressure down to 0.5 psig, reversing the differential drive pressure, and begin harvesting fluid back out of the 200 mL system through the same channel it just fed. And then finally, by actuating a different pinch valve, the same drive controller is being used to control harvest pressure from a second channel in the system and transfer additional liquid from the 200 mL system into the barrel down on the lower left. Again, you can see that the system head pressure being shown by the center gauge continues to be held accurately at 1 psig.
Thanks for watching and remember, for precise control of system head pressures, or for applications requiring precision pressure-driven flow control, contact us at Clippard or your local Clippard distributor to learn more about the capabilities of our Cordis line, or visit us at clippard.com.
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