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
-----Original Message-----
From: Moyer, David [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, June 26, 2001 10:29 AM
To: '[EMAIL PROTECTED]'
Subject: RE: ORP
if you have the probe in any section of the tank where there is
significant
aeration you may get elevated readings from the oxygen in the
bubbles or if
bubbles are actually sticking to the sensor tip you can get readings
like
that...otherwise, in an normal aquarium without any oxidant added
(ozone or
chlorine etc.), usual levels are anywhere from 150-300 mV; any
reading below
0 mV is anoxic...you'd know this without the ORP probe
yes, it could be that your probe is reading high...not likely that
the
analyzer is bad; it's almost always the probe...they go bad in 12-18
months
generally, depends on make/model/manufacturer; if you bought
something that
was sitting on the shelf somewhere for 12 months, it may be
worthless...is
the probe dated in any way?
has the sensor tip ever dried out? they need to stay wet at all
times or
the reading will be off or the probe may be ruined
do you have any calibration solution to work with? could be that
the probe
is sensing properly but not reading in the proper range; you may
need to
adjust the analyzer down by X mV to read the proper reading or
simply
subtract X mV from the reading on the analyzer
ORP is simply a moot point on many grounds for monitoring...three of
the
same brand probes hooked up to one analyzer (one at a time) can and
will
read three different mV readings...it's just the nature of the beast
if you are not using ozone or you are not planning on using ozone or
unless
you plan on using it for some type of denitrification reactor, I
don't think
it is important to monitor ORP anyway (anyone have information
contrary to
this?? there may be some critters that are sensitive to high/low mV
levels
that I am unaware of)
-----Original Message-----
From: Shane Clays [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 26, 2001 12:22 PM
To: '[EMAIL PROTECTED]'
Subject: RE: ORP
Wow. My ORP Probe must be way off, because I don't use any ozone. Is
it even
possible to reach the levels I am reading without ozone? The probe
is ran
through my Neptune Aquatroller. Maybe it is way off??
Shane
-----Original Message-----
From: Moyer, David [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, June 26, 2001 9:21 AM
To: '[EMAIL PROTECTED]'
Subject: RE: ORP
ORP is measured in mV
below 450 mV in the system with the animals
in theory, ozone leaves a residual at 450 mV...residual
ozone would
do to
your animals what the residual disinfectants from your
domestic/tap
water
would do (reason we dechlorinate)
however, this is theoretical; if your critters are alive and
well
without
signs of scratching or respiratory distress, your level of
460 mV is
probably not above the theoretical 450 mV
basically, if you are constantly feeding ozone into your
system and
you
haven't had problems with animals being affected, you
probably won't
start
having problems...unless you decrease the biomass of your
system or
feed
less food (less organic reduction=higher mV levels all other
things
being
equal)
does your ORP analyzer/probe control the ozone feed rate in
the tank
(is it
a feedback loop) or is it just measuring what is going on
and you
are
manually adjusting your ozone generator?
Dave
-----Original Message-----
From: Shane Clays [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 26, 2001 11:11 AM
To: '[EMAIL PROTECTED]'
Subject: ORP
All,
What do those of you who monitor your ORP try to keep it at?
Mine is
at
about 460, and I don't know if that is good, bad or what. I
have not
found
anything in my books to really help me out...
TIA,
Shane C.
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