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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