Mike, I'd say conductivity and pH combined are the best indication of rinse water purity. pH measurements on relatively pure water can be tricky, but don't let people tell you it can't be done or that it's meaningless. Try to get a calibration standard solution for your conductivity bridge or meter that matches the range of the water you're testing. If you had to pick one measurement, I'd choose conductivity. > Timothy Reeves > ECD Circuit Board Division > 13626 South Freeman Road > Mulino, OR 97042 > [log in to unmask] > (503) 829-9108 (800) 228-8198 FAX (503) 829-5482 > > ---------- > From: Michael Fenner > Sent: Wednesday, February 9, 2000 10:36 AM > Subject: Re: Saponifier concentration measurement > > The posts on this topic were interesting. > For my continued education/information what does the 'net think of using > conductivity checks on > final rinse water as an instant process control parameter? > > Mike Fenner > > ############################################################## 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 ##############################################################