In a message dated 05/15/2000 9:16:27 AM US Eastern Standard Time, [log in to unmask] writes: > It is an > excellent machine for contamination testing, it tests the level of NaCl in > a 75% IPA/water solution. Methinks Mr. Noorlag is just funnin' y'all. None of the bulk ionic contamniation will tell you anything about how much sodium, how much chloride, or how much sodium chloride is on the test substrate. All of these units return a measure of conductivity or resistivity of the solution, usually measured in microsiemens/cm or megohm-cms. That drop in resisitivy, or rise in conductivity, is measured against how much of an ionizable material, in this case sodium chloride, it woult take to get the same drop/rise (respectively). That is why the output of these instruments is listed in micrograms of sodium chloride EQUIVALENTS per unit area. It has nothing to do with how much sodium or chloride is present. As my assistant Dave Morrow indicated, you need an ion specific test method to make such a determination. Doug Pauls CSL ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################