I have not looked at this for more than a year, but I recall that the calibration solutions or standards were in the 500-1000 PPM range, and I did not think that would be helpful when I wanted to measure more in the 20-50 PPM range. I shall get a calibration solution of Na Cl .
Allen -------------------------------------------------- From: "Ben McCafferty" <[EMAIL PROTECTED]> Sent: Tuesday, October 07, 2008 5:57 AM To: <[email protected]> Subject: Re: Toggle Power Switch > > The Science Company in Denver stocks several models, and very inexpensive > too. I would strongly suggest spending the few extra dollars for one that > has automatic temperature correction. > > http://secure.sciencecompany.com > > Search on "tds" and you'll find lots there. If you search "tds meter" > you'll only get one result. I have the bright blue TDS-EZ and it works > fine, but does not have ATC so I have to do a little math. > > Allen, I would argue that using the meter for very small measurements > makes > it even more critical to calibrate it, because any variance is a much > higher > percentage of your reading. Same place sell calibration solution for a > few > bucks. > > tx, > bmc > "Faith will move mountains, but you'd better bring a shovel....." > > > >> From: Allen Worrall <[EMAIL PROTECTED]> >> Reply-To: <[email protected]> >> Date: Mon, 6 Oct 2008 08:09:13 -0800 >> To: <[email protected]> >> Subject: Re: Toggle Power Switch >> >> >> A TDS meter. www.tdsmeter.com >> >> Model TDS-4. I do not remember where I purchased it, but it was on-line, >> and >> I think from an aquarium supply company. It is made by a company called >> HM >> digital. They also make a model TDS-4TM which I think has a thermometer >> in >> it. It can be calibrated if you can find a calibration solution. All the >> calibration solutions I saw were at a much higher level of TDS than what >> I >> am measuring, and I did not think that would be worthwhile, so I have >> never >> calibrated it. For the purposes I am using the meter, I do not think high >> accuracy is necessary. >> >> Allen >> -------------------------------------------------- >> From: "TWG" <[EMAIL PROTECTED]> >> Sent: Monday, October 06, 2008 5:53 AM >> To: "Brewtus" <[email protected]> >> Subject: Re: Toggle Power Switch >> >>> >>> How do you measure TDS? >>> >>> On Oct 5, 3:06 pm, "Allen Worrall" <[EMAIL PROTECTED]> wrote: >>>> I work the same way. My timer is an Intermatic Heavy Duty Model TN311 >>>> or >>>> maybe it is Model TN3II. It is a mechanical timer and works well. I >>>> also >>>> rarely use the red on-off switch on the front of the machine. As Ray >>>> said, I turn it off when I go on vacation, but I also use it when I >>>> partially drain my steam boiler, which I do once a week on Sunday >>>> morning. In addition to the Cafiza blind portafilter treatment, I turn >>>> off the red switch, run about 200-300 cc of boiling water out of the >>>> hot >>>> water valve of the machine, then turn the red switch on and allow the >>>> pump to pump new water into the steam boiler. >>>> >>>> I do this of course to try to keep the TDS (Total Dissolved Solids) in >>>> the steam boiler low, to minimize scaling. I put distilled water into >>>> my >>>> water reservoir, and add just a little tap water to make the TDS >>>> reading >>>> about 10-20 PPM. I find that is enough to allow the sensor in the steam >>>> boiler to work. This morning the TDS reading of the water I removed >>>> from >>>> the steam boiler was 110 PPM (I allow it to cool before I measure the >>>> TDS). My tap water is 250-275 PPM TDS. >>>> >>>> Allen >>>> >>>> From: Ray Sachs >>>> Sent: Sunday, October 05, 2008 9:01 AM >>>> To: [email protected] >>>> Subject: Re: Toggle Power Switch >>>> >>>> If that timer is on backorder, the are plenty of other good ones out >>>> there. I'm not sure what make my timer is, but its been working >>>> flawlessly for a couple of years now. Those things aren't exactly >>>> rocket >>>> science these days. Most wristwatches are more complicated. Every day >>>> the >>>> machine is on and warmed up when I come downstairs to make the first >>>> shots. It either turns off by itself at 1 pm or I turn it off manually >>>> sooner. The only time I touch the on-off switch on the espresso machine >>>> is when we're leaving town for a day or few or longer. Then I flip it >>>> off >>>> so the timer won't turn it on everyday while we're gone. Otherwise, I >>>> never hit that switch. >>>> >>>> -Ray >>>> >>>> On Sun, Oct 5, 2008 at 1:18 AM, mpsadeghi <[EMAIL PROTECTED]> >>>> wrote: >>>> >>>> Thanks for the informative reply and for the advice, Brewtus Maximus! >>>> This is great! Seems like the right way to go so I took you up on >>>> your recommendation and ordered the intermatic. They're on back order >>>> but I'll let you know how it goes when i get it set up. I hadn't read >>>> the reviews about the melting red rocker switches and am now thankful >>>> that i have my simple switch...which heck, isn't so bad to look at >>>> after all. And i do agree, especially after today's maiden voyage, >>>> simpler interface is better. By the way, the maiden voyage was so fun >>>> and rewarding once I got things dialed in. Coming from a little, putt- >>>> putt Francis Francis, when I pulled the lever up on my Brew2, it was >>>> like turning the lights on to a vast, new world! Ha! Again, I >>>> appreciate the guidance and insight! >>>> >>>> buzzing from all the test pulls, >>>> >>>> Marc >>>> >> >> > > > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Brewtus" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/brewtus?hl=en -~----------~----~----~----~------~----~------~--~---
