Yes. Trem
----- Original Message ----- From: "Grant" <[email protected]> To: <[email protected]> Sent: Thursday, May 30, 2002 7:57 PM Subject: Re: CS>TDS-1 versus PWT for measuring PPM > Ok Thanks Trem: > I guess I have been short changing myself then?.. I have been taking > final reading, subtract initial water reading and then dividing by > 2...Quite a substantial difference from your method Hu?? > > Grant.. > > Trem wrote: > > > > Hi Grant, > > > > We take the final reading, subtract the initial water reading and multiply > > by 1.2. For more accuracy it's best to wait 24 hours because the ionic > > content will drop during that time. > > > > I usually just take the initial PWT reading right after the unit shuts off > > and it is plenty close enough without having to wait and then apply the > > correction factor. > > > > Remember, this isn't rocket science and close is plenty good enough for most > > folks. > > > > Trem > > > > ----- Original Message ----- > > From: "Grant" <[email protected]> > > To: <[email protected]> > > Sent: Thursday, May 30, 2002 9:49 AM > > Subject: Re: CS>TDS-1 versus PWT for measuring PPM > > > > > Sorry Trem: > > > What I meant was what is final formula for the "PWT", not > > > the TDS-1.. > > > Tks Grant.. > > > > > > Trem wrote: > > > > > > > > Hi Grant, > > > > > > > > I really don't know since we will not sell them. I bought one years ago > > > > thinking it might be the unit to use and provide to our customers but > > soon > > > > after discovered the PWT meter was the unit of choice. > > > > > > > > I just took the average of 3 PWT readings of some CS that measured 20 uS > > > > (water was 1.6 uS so total PPM was 22) and measured it with the TDS-1. > > It > > > > measured 7 so guess I would multiply by 3 to get the same PPM as the > > PWT. > > > > > > > > Of course I have no idea if the TDS is reading correctly but if it is > > then > > > > the correction factor would apply to anyone else's TDS meter when > > measuring > > > > CS with the same ionic content as our CS. > > > > > > > > Hope this helps. > > > > > > > > Trem > > > > > > > > ----- Original Message ----- > > > > From: "Grant" <[email protected]> > > > > To: <[email protected]> > > > > Sent: Wednesday, May 29, 2002 8:20 PM > > > > Subject: CS>TDS-1 versus PWT for measuring PPM > > > > > > > > > Hi Trem: > > > > > ` So what's the final formula for the TDS 1??? > > > > > `Is it half the pwt reading plus 20%.?? > > > > > Tks.. Grant.. > > > > > > > > > > > > > > > > > > > > *********************** > > > > > Hi James, I don't mean to jump in when you addressed the post to Dean > > > > > but the fact is that the PWT reads CS much better than the TDS-1 for > > > > > several reasons as pointed out on our website. Also, you do NOT > > divide > > > > > by half when using the PWT. You ADD to the reading. In the case of > > our > > > > > generators you add 20%. Hanna is right in telling you to cut the > > > > > reading in half IF you're measuring dissolved solids such as minerals > > in > > > > > the water. However, we as CS users are interested in measuring the > > > > > content of CS to determine what silver content we have. In this case > > > > > the meter only measures the ionic portion of CS. And that reading is > > > > > always less than the total amount of silver content because the meter > > > > > will NOT read the colloidal portion. Therefore one has to add to the > > > > > reading to get the total PPM. The correction factor will be the > > > > > difference between how much of the mix was colloidal versus ionic. > > We > > > > > have had our CS analyzed by atomic absorption spectrophotometry and it > > > > > is generally always the same ratio. Another thing I forgot to mention > > is > > > > > the fact that the TDS-1 has an accuracy tolerance of + - 2% of full > > > > > scale. Since the TDS-1 reads from 0-999 that's + - 20 PPM. Since > > the > > > > > PWT reads from 0-99.9 and has the same percentage of accuracy that's > > + - > > > > > 2 PPM. And the PWT gives you a decimal point in the reading while the > > > > > TDS-1 reads in whole numbers only. I hope this helps clear up some of > > > > > the controversy about the TDS-1 versus the PWT. The PWT is the best > > > > > choice hands down for measuring PPM.T > > > > > > > > > > > > > > > -- > > > > > 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]> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
