On the last point - a reading of 10 cannot give a true between 0 and 20. A reading of 10 means that there is some conductivity and therefore 0 is impossible and the actual reading must at least be 5 or more for what is basically a reasonable instrument - I would guess at least 7.
Terry ----- Original Message ----- From: "Dean Miller" <[email protected]> To: <[email protected]> Sent: Tuesday, October 29, 2002 8:33 PM Subject: Re: CS>TDS/PWT meters > On Tue, 29 Oct 2002 13:31:25 -5, "M. G. Devour" <[email protected]> > wrote: > > >Specs for my Hanna TDS-1: > > > >Range: 0 to 999 ppm > >Resolution: 1 ppm > >Accuracy: +/- 10 ppm > >Typical EMC Deviation: +/- 1% of Full Scale > > > >If I interpret this right, my TDS meter should read in steps of 1 ppm, > >with no decimal point or tenths, etc., which indeed it does. > > > >That means the smallest increment it can *resolve* is 1 ppm. > > > >The display, with 3 digits, will show from 0 to 999. > > > >The accuracy of 10 ppm out of a full scale range of 1000 ppm is, indeed > >1%. > > Just to clarify. The accuracy is +/- 10 ppm. That means any reading > could be high or low up to 10 ppm. A reading of 20 on the TDS meter > means that the real value of the solution could be anywhere from 10 > ppm through 30 ppm. (A reading of 10 would be from 0 through 20.) > > -- Dean -- from (almost) Des Moines -- KB0ZDF > > > -- > 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]> >
