Hi Bill, this si very helpful - although I am not sure if I completely get it. However - it provides me a place to start. I have a sort of phobia for technical stuff -- when I read about it I just can't absorb or understand -- but if I get concrete and do it -- for instance, get the meter and try what you suggest, then It may penetrate my skull.
It'll be a couple of weeks before I can get to it -- but then you and Ivan may find yourself inundated with questions! Thanks again Katarina > > Katarina, > > Looking at the graphs of concentration, electrode spacing, and pulsed > DC test results posts you will see an attempt at relating electrode spacing > to conductivity(CS resistance). What I am trying to do is simply say that > if > Ivan's setup(electrodes spaced 1 3/4 inches apart) measures > 20Kohms(20,000ohms for 12 - 15ppm) across the electrodes then in my > setup(electrodes 3/4 inch apart) should measure around 15Kohms(15,000) for > 12 - 15 ppm. > > > How to measure CS resistance: > > 1. Get a volt-ohm-meter(radio shack) that reads in the > milli-ohms range. > > 2. Measure input voltage at Electrodes. It is easier if > you have a regulated or known voltage source. In other > words if you know your voltage across the electrodes is > 12VDC and it doesn't change then no need to measure it. > > 3. Wipe electrodes > Change you electrode spacing to 1 3/4 inches. > Put electrodes in CS solution. > > 4. Measure your current(you will need to read you VOM > manual) Ex. The meter displays .6 on the ma(milli- > amp) scale. This is equal to .0006amps. > > 5. Calculate the CS resistance. > Voltage = CS resistance X Current > 12VDC = CS resistance X .0006amps > 12/.0006 = CS resistance > 20,000 = CS resistance > > > 6. From Ivans graph 20,000 is around 13ppm. > > Note: It is easier to move the electrodes and measure, > than not moving the electrodes and guessing. > Since Ivans measurements are at 1 3/4 inches and his > graphs are affected by the spacing it is best to get > as close to his set up as possible when > measurements are taken. Since his graph relates ppm > with CS resistance it is easier to read the graph. > > If your CS resistance isn't exactly 20,000ohms look > at my post, graphs of concentrations(resp). The post > shows you how to ball park your ppm if your > resistance is above or below 20,000. > > Electrode size and wetted length will affect your > current readings but, for ball parking your ppm the > above method should work fine. > > I hope this helps. > > > BillH > > -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
