Nicholas, We use the DX100, DX120, and the older 2000I Dionex systems in our day-to-day contamination study activities. However, the basic operation theory is pretty much the same for IC systems. We would be happy to discuss the topic offline or if you prefer provide more specific details as to what you need for the benefit of discussion for the TechNet forum. "Operation theory" is a rather broad topic and is therefore a bit cumbersome to tackle for e-mail discussion. David Morrow - Project Engineer Contamination Studies Laboratories, Inc. (765) 457-8095 ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################