Re: [compost_tea] Re: DO Meters

From: Ted Peterson <ted.peterson_at_tcsn.net>
Date: Sun, 21 Dec 2003 15:43:25 -0800

The one I use is from ICM. It comes in a black plastic case that holds the=
 probe and cable. I follow the instructions and clean it after each use by =
dumping the probe in clean water. Make sure you calibrate the unit per ins=
tructions every so often.

Ted Peterson
Earth-Wise/Spirit of the Earth
  ----- Original Message -----
  From: chriscreid
  To: compost_tea_at_yahoogroups.com
  Sent: Sunday, December 21, 2003 3:27 PM
  Subject: [compost_tea] Re: DO Meters


  Judi,

  I saw Kevin's post and have a question for him that I'll include
  here. Tom Jaszewski has an Extech, the one with the 13 ft cable for
  tracking the readings on a computer.

  Here's what he told me about it:

  1. The membrane goes bad often enough that he keeps several on
  hand. When this happens, he gets squirrelly readings. (Kevin -- have
  you changed the membrane on yours?)

  2. The DO meter has a separate data logger available. Tom tried it
  and his experience is that it was very buggy and glitchy. He took
  the software sold with the DO, put it onto an old used PC that he
  picked up for $50, and runs it that way. He told me recently that he
  saw a similar PC for sale on E-Bay for $14 ( I can look up the specs
  he gave me but they're not close at hand and I'm writing while
  cooking dinner).

  Other than the membrane problem, he's satisfied with it.

  3. I see that Ted Peterson is using another brand entirely, so
  there's another perspective to check out.

  4. Not sure if this is the one Scott Alexander is using, but there
  is one inexpensive DO that somebody told us about -- the company
  told them that the thing worked great and only problems they had
  were with people using them for compost tea! 9Well, I don't want it
  for aquarium research, so...0

  Hey Judy, if you want to research this for the list, I'll send you
  everything I"ve got on DOs and aeration, and you can contact people
  and companies, ask them questions and report back. What is not
  clear from what I've gathered so far is what characteristics to be
  looking for, and any special considerations that might relate
  specifically to tea. Bob Pyke (the refractometer source) doesn't
  sell these as I recall, but he might have some suggestions on people
  to talk to about them. So far, it seems we are buying them based on
  each others' experience, but we're not sure how really to select
  them other than what worked for others on the list.

  Let me know if you have any interest in pursuing.

  In any case, I'll find you the PC specs if you decide you want to go
  the data tracking route with Extech. I think price is about 360-
  $450 range depending on whether you get the Extech with or without
  the 13 ft cable for the data logging setup.

  Hope this helps,

  Chris



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Received on Sun Dec 21 2003 - 19:25:16 EST

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