Thanks. I remember emails going around addressing this some time ago and
someone (probably you) had mentioned bad probes. That is why I bought new
ones. This ORP probe is the second new one I bought, and the pH is brand new
(the old one was only 5 months old) as well (so is the temp for that
matter). I have pretty much ruled out the probes being bad. Do you still
think that is it? Do you know of any other conditions which may cause these
weird readings, or are there any other things I can do to correct the
situation beyond replacing the entire unit ( I do have one of the
originals)?
TIA,
Shane C.
-----Original Message-----
From: Neptune [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, June 26, 2001 10:50 AM
To: [EMAIL PROTECTED]
Subject: Re: ORP
I can address some of your concerns as I have had two different
Aquacontrollers. Apparently you have one of the original ones. The
reason
I say this is that the original ones had problems with inconsistent
readings
due to not having a common reference point. As you pointed out,
depending
on which probes you have plugged in, you get different readings.
This tells
me that you probably have at least one bad probe. It could be any
of them
or more than one. Fun stuff...or not. I traded in my old, original
Aquacontroller for the Pro model, and it uses the temperature probe
as the
reference for all of the probes. It's a new/re-designed temp. probe
which
acts as some sort of ground. For instance, when I calibrate my pH
probe, I
have to place it and the temp. probe into the solutions! The manual
even
goes on to say that all of your probes need to be within inches of
each
other in the tank. FWIW
Craig
> Thanks guys. Heres the deal. The probe is in the sump. Very well
could be
> getting bubbles stuck, and is definitely getting a good dose of
oxygen
> because the sump water is highly oxygenated. That may have
something to do
> with it. As mentioned, I am going to try moving it around the tank
tonight
> and see what happens.
>
> The probe is new (maybe a month) and has never been allowed to dry
out.
>
> Here are a couple other things that are weird. The ORP goes up at
night.
Is
> this normal or proper? I thought that with the lights off, the pH
goes
down,
> oxygen levels drop and thus wouldn't the ORP go down as well?
Also, I have
> noticed that the Aquatroller readings vary depending on what
probes I have
> plugged into it. When I have the pH probe and ORP probe plugged in
at the
> same time, the pH reading goes up, and the ORP goes down. When I
unplug
> either one, the readings change. This could bring on a whole new
slew of
> questions and problems. I have the tank grounded, all of my probes
are
> within a month old (that I know of), the probes are in completely
different
> areas and the tank and I am still getting skewed readings when all
probes
> are plugged in. Anyways, without the pH probe plugged in, the
reading on
the
> ORP probe is hitting the 460 range. When I plug the pH back in,
the ORP
hits
> about 410. Thus, I will move it around tonight and see if it
changes.
>
> I wish I knew someone that had a ORP monitor so I could compare
them and
> adjust accordingly, but I don't. If anything, I may end up having
to
> disconnect the ORP probe and leave it off....
>
> Thanks,
> Shane
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