Trem, since the subject came up, how much difference does the calibration temperature make? I know the cal needs to be done at a certain temp. Would there be a ballpark correlation between calibration error and temp. deviation from the standard during calibration? Is there a uS per degree F deviation ballpark error (in the 10-20 uS range)? The reason I ask is that I have both the PWT and the cal solution. I haven't used the solution yet because I have no reason to believe it's out of cal. The uS I read in my CS was within 1 ppm of the ppm CS Ole Bob measured. When the time comes and I calibrate my meter, I wondered how meticulous I need to be, and how much difference a few degrees would make.
Thanks, Vince -----Original Message----- From: Trem [mailto:[email protected]] Sent: Friday, October 10, 2003 4:21 PM To: [email protected] Subject: CS>Measuring very high ppms ----- Original Message ----- From: "Mike Monett" <[email protected]> To: <[email protected]> Sent: Friday, October 10, 2003 1:41 PM Subject: [silver_list] Re: CS>Re: Measuring very high ppms > > The Hanna PWT would be an excellent method if I could find some way > to guarantee the calibration. Steve Young's idea to make resistive > standards might be an excellent solution. > Mike Monett Mike, The meter can easily be calibrated if you use the calibration solution from Hanna. I got one box of 16 bottles of solution that was defective and Ken got one of the bottles. It was the only batch I have gotten that was defective in many years. I think you can generally trust the solution to do what it was intended to do....allow calibration of the PWT. It will be very difficult to use a standard resistor since the sensing electrodes are not easily accessible and the meter would have to be disassembled to get at the electronics. Not something the average person would want to do. And it's really not a good idea when all one has to do is use the factory solution. Trem -- The silver-list is a moderated forum for discussion of colloidal silver. Instructions for unsubscribing may be found at: http://silverlist.org To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
