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Tech Center
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Solvent Reservoir There are several products you may need for the inlet solvent connections portion of your system setup. The first is a Solvent Reservoir Cap to help seal off the solvent to prevent vapors from escaping into the laboratory atmosphere, and to prevent exposure of the solvent to external air and dust. Most modern systems employ 1 Litre solvent bottles for their reservoirs, and most of these have standard GL45 threads. Also most systems use 1/8" OD Teflon® tubing for both the sparging gas delivery and the inlet solvent delivery pathways. Therefore, the bottle cap that is most recommended is the A-620. This product has two holes through which the 1/8" OD tubing may pass and be held securely, plus a luer-tapered vent hole. Of course, you may wish to use the standard 4 Litre solvent bottles directly as your reservoirs. However, these bottles employ GL38 threads, and therefore require different caps. For standard applications involving 1/8" OD tubing, we recommend our A-622 bottle cap, offering the same features as the A-620 bottle cap, but with GL38 threads to engage properly with 4 Litre solvent bottles. With either bottle cap style, you may wish to plug the vent hole to positively pressurize the solvent reservoir. The A-626 is recommended for this purpose, designed with a luer taper to press fit into the vent hole on our bottle caps. There are also standard accessories to use for general solvent delivery. For tubing, the 1523, a 10-foot roll of 1/8" OD FEP Teflon tubing is the most highly recommended. Additionally, you will probably need an Inlet Solvent Filter, and there are four which we would recommend. For applications where no metal can be present, Upchurch Scientific manufactures an all-PEEK™ solvent filter, the A-435. In addition to being biocompatible, this product includes a built-in sparging filter. And, being part of our line of Bottom-of-the-Bottle solvent filters, the A-435 allows solvent to be drawn within less than 1/8" of the bottom of the solvent reservoir. The A-435 has a 2-micrometer porosity frit, which is applicable for most analytical flow-rate systems. A 2-micrometer filter may be problematic if your analyses require a high flow rate. Therefore, if you desire biocompatibility and higher flow capacity, Upchurch Scientific manufactures A-440, a 10-micrometer version of the A-435. If you do not sparge your solvent, you may prefer a filter without a built-in sparging port. My recommendation would then be to use either our A-551 or A-302. The A-551 is a different version of our popular Bottom-of-the-Bottle solvent filters. It incorporates a 2-micrometer replaceable stainless steel filter cup, through which solvent can be drawn down to within 1/8" from the bottom of the solvent reservoir. While more expensive up front, this solvent filter becomes very economical, as the replacement filter cups are less expensive than any single filter unit offered by Upchurch Scientific. This unit requires the use of a flangeless fitting (included) to attach tubing to the filter body. In addition, this filter is constructed of PEEK™ and Tefzel® polymers, which may not be completely compatible with your solvents. Alternatively, our A-302 is comprised completely of stainless steel and utilizes a barbed stem, which inserts into your solvent inlet tubing. While this filter is not a Bottom-of-the-Bottle filter, it remains one of the most popular filters due to its ease of use. Copyright © IDEX Corporation 2010. IDEX Health & Science is a Unit of IDEX® Corporation. | Privacy Policy |