Hi Vikki; The one centimeter probe is the next best thing to a spect. for knowing what you are doing in CS generation. Conductivity is defined in the P. Chem region as K = 1xC/R. C being the cell constant and it is one if the blades exposed to the solution is 1 cm x 1 cm x 1 cm. If one should make the blade width 1/2 cm and the length 2 cm the area is 1 sq. cm, but the cell constant is .5.
1. So get a piece of brass, copper , or silver (all are minerals that the body needs) and make it .394" (1 cm.) wide by about 1 -1/4" long. 2. Solder a 18" x #24 flex lead on one end of each electrode, put a banana plug on the end to fit your ohmmeter 3. Locate a piece of Plexiglas or Lexan that is 1/2" x 1/2" x 5 to 6" long. Thin one end to .394" (1 cm) for about 1" long. 4. Epoxy the two electrodes on the plastic so that there is 1 cm over hang and are spaced on the 1 cm side. What you have looks like a tuning fork. 5. Paint the back sides, end, and edges with finger nail polish or epoxy so that each electrode has only one surface that can contact the water. 6. To use; set the ohmmeter to the 2000x scale (this thing is scale sensitive), submerge the tip into the CS and rapidly swish the blades in the CS so as to reduce the electric field build-up and the reading will stabilize. An AC ohmmeter running about 400 hz to 1 k hz would eliminate this problem. (one might try 60 hz) . Beckman Blocks are used to measure ground moisture and a 1 khz ohmmeter is needed to get consistent readings. If you keep good data on your CS runs and record the Rb (that is what I call the bulk resistance of the solution.) Just after the run and day later you will note an increase in resistance. I like to use ohms as it is a direct reading. Of course one could buy for many bucks a meter reading in conductivity (microSeimens, mS) or you can divide, 1/Rb in megohms is mS. This is should explain why the readings made from the CS electrodes give such strange readings. The post of the BIG TANK is great. All of the elements are there for any size of generator. i.e. polarity switching, stirring, and current monitoring The initial cell current Ic0 (my nomenclature) is the best indicator for the water quality and run time . The final current Icf and ppm are directly related when switching is used and it correlates with ppm. I have a neat stirrer that uses a R.S. 11/2 volt motor and a 2" length of insulation from a piece of #14 copper house wire. The holder is a modified 3/4" pvc pipe coupling drilled out to 15/16" and has two saw cuts. one cut is made on the side about 1/8" to 1/4" from the bottom and goes about half way through the coupling. The other cut is down the side from the top to the first cut. This allows the coupling to act as a spring to hold the motor. Make a lid for your brew cup to hold the electrodes and provide a 5/16" hole for the shaft end of the motor. Glue the modified pipe coupling on to the lid so that the motor is center over the hole. Shove on the insulation. I have 2 10 ohm resistors in parallel to run the motor. 11/2 volts really stir up a storm!!!!!! "Ole Bob" -- 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]>
