I must be really dense,,I have read the info from Silvergen, and this list,,and what I gather is: ...the Hanna PWT is right on on its reading,,also it is 45% too high.. ,,how can it be both???
----- Original Message ----- From: Trem Williams <[email protected]> To: <[email protected]> Sent: Thursday, April 13, 2000 6:41 PM Subject: Re: CS> PPM | Hello Robert, | | I agree very closely with your information. We market the Hanna PWT and | tell our customers the meter reads correctly on samples we have had analyzed | by the atomic absorption method but if they want to follow the information | given by Hanna, to multiply the reading by .55 to get their reading. In any | case, it's right on or 45% high. I really don't see this as a critical | problem since we're speaking only of a few parts per million. This is | briefly covered on our PPM page at our web site. We do not mention the 55% | effect since we are content to accept the AA test as being accurate. | However we do point this anomaly out on the instruction sheet we provide | with the PWT. | | What is important is the fact a person can tell from batch to batch what | they have made. The PWT is the best low cost solution to making reliable CS | from one batch to the next and confirming the results. The TDS-1 is | unacceptable for measuring PPM. | | Trem | www.silvergen.com | Constant Current Colloid Generators | | | ----- Original Message ----- | From: Robert Dohr <[email protected]> | To: <[email protected]> | Sent: Thursday, April 13, 2000 3:06 PM | Subject: Re: CS> PPM | | | > Greetings Seekers; | > Ivan, our numbers are similar (.59 to .57) but I think you may have them | > backwards. The instructions from Hanna and what my lab results confirmed | was | > .59PPM/us. or take the reading in us/cm times .59 to get PPM. In my case | > 25.5us/cm = 15 PPM. per lab test. Also the us/cm will drop with time for | the | > first 10-12 hrs, not rise. This appears to be due to the CS dispersing | > throughout the DW. Immediately after making a batch the CS is concentrated | > around the ion path between the electrodes. A reading taken at this time | will | > be high and erratic. After sitting overnite the reading will be lower but | > stabile. After this initial dispersion the reading should not change | futher. I | > have CS that is now several months old that still reads within 1 us/cm of | when | > it was made. As for accuracy my PWT measures in .1us/cm up to 99.9us/cm. I | > calibrate it using a solution from Hanna that measures 84us. It comes in | small | > pouches that you tear open and insert the meter. Use once and throw away. | > NAMASTE' | > Beldohr | > | > ____________________________________________________________________ | > Get your own FREE, personal Netscape WebMail account today at | http://webmail.netscape.com. | > | > | > -- | > 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] | > Silver-list archive: http://escribe.com/health/thesilverlist/index.html | > List maintainer: Mike Devour <[email protected]> | > | > |
