Bill Although I am not familiar with this machine, I will give it y best shot: First You need to establish the correct balance of IPA and De-Ionised water 75% to 25% respectively. This is usually done based upon Specific Gravity. You then need to verify the accuracy of the resistivity/conductivity sensor in the system. This is achieved by introducing a known quantity of calibrated saline solution into a know volume of test solution (alcohol and water). I suspect your problem will be related to the balance of the test solution, alcohol solvating faster than water. Without the manual - shame on Alpha (my competitors!!) - it is difficult to go further except to recommend that you drain down the tank and refill with fresh solution at the right mix 75/25 and re-calibration from there may be possible. Regards, Graham Naisbitt __________________________________________________________________________ [log in to unmask] Concoat Ltd Alasan House, Albany Park Camberley GU15 2PL UK http://www.concoat.co.uk -----Original Message----- From: Irwin, William D <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: 13 February 1998 15:33 Subject: [TN] Alpha Metals Ionograph 500M Chemical Verification >I have an Alpha Metals Ionograph model 500M that I have inherited from >an engineer that is no longer with the company. Along with this piece >of equipment I have only inherited internal procedures that look like >they have been copied from the manual, but no manual. > >We have to calibrate or verify the solution by taking a specific gravity >and running the test procedure. in this you use the reading you have >taken above and add a know amount of contaminate to the unit. I am then >looking for a reading of 37.5 (+/- something I'm assuming) for a pass. >the problem I am having is that I am reading in the 420's to 460's and >no one here has ever seen this unit fail. we also do not cover the fail >contingency in our procedures. I have been leaving messages with Alpha >Metals for 2 days with no reply. > >Help!!!!!!!!!!!!!!!!!!!! Has anyone encountered this and if so could you >give me some guidance. > >Bill Irwin >[log in to unmask] >Bill Irwin >Berg Electronics >(717) 764-7309 > >################################################################ >TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >################################################################ > > ################################################################ TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################