OOPS 14 doubled is 28 PPM..not 24. However, different brands of TDS meters might be using different fudge factors. Water Industry standard for some applications is x 1.5 microsiemens and others is x 2. The "hanna" TDS meters use x 2. Other brands? I dunno. I'd tend to believe 14 x 1.5 = 21 PPM more than 28 PPM.
ode At 07:10 AM 4/7/2004 -0400, you wrote: >OK, I'm thoroughly confused now...I have a TDS and it reads zero when I put >it in the DW from Walmart. After making my CS with my silverpuppy it will >read 14ppm. Is that the correct ppm? or do I need to subtract/multiply/add >any numbers to get an approximate on my ppm readings? or should I just go >and get the PWT? > >Thanks for all the knowledge. Deb >----- Original Message ----- >From: "M. G. Devour" <[email protected]> >To: <[email protected]> >Sent: Wednesday, April 07, 2004 7:20 AM >Subject: Re: CS>PWT and TDS readings > > >> I have to agree with Al, here. >> >> The zero intercept of the TDS-1 seems to be stable and correct. It >> reads zero in good distilled water. It goes above zero as soon as >> anything is put in the water; ie., there's no dead zone. The scale is >> linear. >> >> If there was an error of 20 to 40 ppm at the low end I haven't seen >> evidence of it. >> >> This isn't to say the PWT isn't the better instrument. It is. The TDS-1 >> is better than folks are trying to make it out to be, however. >> >> Be well, >> >> Mike D. >> >> > > Most of the Hanna TDS instruments have ranges of 0-999 PPM or >> > > 0-1999 with 2% accuracy of full scale. That means the unit can be >> > > off by as much as 20 or 40 PPM at the low OR high end of the range or >> > > at any reading. >> > >> > How can it be off 20 or 40 PPM at a reading of 1PPM ? Or even 10 PPM? >> > I think the accuracy statement means 2% @ full scale, not OF full >> > scale. >> > >> > My PWT accuracy statement says +/- 2% Full Scale. >> > >> > Al D. >> >> [Mike Devour, Citizen, Patriot, Libertarian] >> [[email protected] ] >> [Speaking only for myself... ] >> >> >> -- >> 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]> >> >> > > >
