O.K. Trem, Thank you. Pavel H. ----- Original Message ----- From: "Trem" <[email protected]> To: <[email protected]> Sent: Wednesday, April 21, 2004 6:04 PM Subject: CS>The Hanna PWT meter, conductivity vs. ppm values
> Hi Pavel, > > It turns out the PWT does double purpose. It measures uS of the water and > in my opinion measurements to a tenth of a microsiemen are plenty good. > After all, this isn't rocket science. > > It then measures the ionic portion of the mix after the silver is put into > the water. It does not measure the metallic (colloidal) portion. We then > use a correction factor to estimate the total amount of silver. > > This is the best low cost instrument for our purpose. > > And yes, it will probably read differently in different solutions but that > will not make any difference if you know the correction factor to use. We > know the typical correction factor for silver is to add 10-20% to the > reading. You would have to send samples of whatever else you wanted to > establish a correction factor for to a laboratory for analysis. You would > then have the ability to determine that particular correction factor. > > We did it for silver at 2 different labs using atomic absorption > spectophotometry and accept the results. > > Best regards, > > Trem > > ----- Original Message ----- > From: "Pavel Hochmut" <[email protected]> > To: <[email protected]> > Sent: Wednesday, April 21, 2004 2:30 AM > Subject: [silver_list] CS>The Hanna PWT meter, conductivity vs. ppm values > > > > Hi, > > I have looked for what the "PWT" means on the Hanna www.pages. > > Both devices mentioned below are from Hanna and are designated for > measuring > > the conductivity. Both of them can ONLY measure the conductivity as every > > other ordinary conductometer does. There is nothing more. > > The "PWT" only means "Purity Water Tester" and determinates the device > rank > > of accuracy in the spread of Hanna products. Nothing more. > > Now I understand the words "I have never seen the PWT meter showing more > > than one decimal place" (from Trem)... it´s correct, because it is it´s > main > > feature - the range of the Hannah HI98308 "PWT" meter is 99,9 - 0,1 > > micsoSiemens with the 0,1 microSiemens resolution. > > If you look on the Hanna pages more carefuly, you can also find the > HI98309 > > "UPW" meter (the UPW means Ultra Pure Water tester) with the range 1,000 - > > 0,020 microSiemens with the resolution of 0,001 microsiemens. > > So: who has the HI 98309 UPW model, he can measure the conductivity more > > precisely having dvo decimal places more than with the PWT model. But the > > UPW model is approx. 3 times more expensive than the PWT one. > > So, one who says: " I have measured my DW and it has 2,9 PWT tells it > wrong. > > Correctly should be said: 2,9 microSiemens (...measured with Hanna PWT > > meter). > > You can also see simple conductivity/resistance conversion charts on the > > Hanna site as I already wrote about. > > This reminds me that I saw posted some relation between the conductance > and > > ppm values. That seem to me incredible, because the substance (dissolved > or > > in the colloidal estate) may have different influence to conductance of > the > > (say) batch. For instance let´s put into the > > 1 cubic cm (1 ccm) of DW 2,000.000 atoms of silver. > > And put to another 1 cubic cm of DW 2.000.000 atoms of Si (silicium). I > bet > > my year´s income, that the resulting conductance measurements shall be > > absolutely different. I swear. > > Or can somebody mend my opinion? Where´s the mistake? > > Thanks Pavel H. > > > > > > > > > > > > > > -- > > The Silver List is a moderated forum for discussing Colloidal Silver. > > > > Instructions for unsubscribing are posted at: http://silverlist.org > > > > To post, address your message to: [email protected] > > Silver List archive: http://escribe.com/health/thesilverlist/index.html > > > > Address Off-Topic messages to: [email protected] > > OT Archive: http://escribe.com/health/silverofftopiclist/index.html > > > > List maintainer: Mike Devour <[email protected]> > > > > >
