A gentle flow of dry gas over the surface of the particles serves to quickly carry away moisture and other contaminants. Needle valves allow careful control of flow rate to avoid elutriation (blowing out) of fine powders.
Water trickles through the degasser where its flow is broken up by a randomly packed medium. This results in a very thin film of water from which gas can easily escape. The vacuum inside the filter increases the rate of gas escape.
In helium degassing, the air dissolved in the solvent is expelled by continuously passing helium through the solvent. This is the most effective method of degassing and is particularly recommended for trace analysis and for avoiding the fluorescence quenching due to the affect of dissolved oxygen on the analytes. The disadvantages associated with helium degassing are the high price of the helium and the fact that the more volatile solvent components like tetrahydrofuran can also be expelled by the helium over a period of time. This can give rise to changes in retention times.
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The panel uses digital keypads or menus for programming.
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A port, or interface, that can be used for serial communication, in which only one bit is transferred at a time. Examples include RS232, RS422, RS485, USB etc.
All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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This is the full required range of ambient operating temperature.
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
