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Tech Center
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Sparging Supply When setting up sparging for your system you have numerous options. First, consider our U-500, a 1/4" NPT Adapter designed to accept a flangeless fitting for 1/8" OD tubing. It attaches to most standard regulating valves typically used on gas cylinders, and therefore facilitates the connection of standard 1/8" OD tubing to the gas reservoir. Speaking of tubing, we recommend you use our part number 1523, a 10-foot length of FEP Teflon® tubing, 1/8" OD x 1/16" ID — the most commonly used material and dimension for both sparging gas delivery and solvent delivery in HPLC systems today. Some other accessories may also prove useful in delivering sparging gas. First is the P-447, a Micro Metering Valve packaged with fittings for 1/8" OD tubing. When used inline along the sparging gas pathway, this valve can serve as a portable, inexpensive gas flow manifold. Because of its construction, the valve offers very fine control over the amount of gas actually entering the solvent reservoir, and also offers the ability to completely shut off gas flow to the reservoir. Note, however, that this product is unnecessary if your pumping system includes a built-in gas manifold. One inherent problem with sparging gas systems involves the supply tubing's gas permeability. Specifically, if the sparging gas reservoir is depleted while the pathway to the solvent reservoir is open, a vacuum may result and cause solvent to back up into the sparging line. And in the case of multi-solvent reservoir systems, this can cause solvent cross-contamination. To prevent this, we recommend you consider using an Inline Check Valve (our part CV-3010). The CV-3010 comes with fittings for 1/8" OD tubing and requires only 3 PSI (+/- 1 PSI) or less to open the valve. But once the inline pressure dips below this value, the valve closes and effectively seals the flow path, thus preventing solvent cross-contamination. Copyright © IDEX Corporation 2010. IDEX Health & Science is a Unit of IDEX® Corporation. | Privacy Policy |