where do you place your probes?
- Thread starter asonitez
- Start date
Deltasigpony
New member
i put all of my probes in the return section of my sump so i know what kind of water is going back into my tank, your orp probe might be off i would think because of the skimmer ( but its late right now for me i might be thinking that orp and redox are the same thing dam bars)
CIGDAZE
New member
I've been wondering about this, too.
I put mine in my overflow, purely out of convenience for ease of cleaning and inspection. I've got about 12X per hour exchange rate with my system, so essentially the tank water's being exchanged roughly every 5 minutes. I would think that there would be little to no difference between tank and sump parameters. Would you guys agree with this assumption?
My other line of thinking was that, I want to directly measure the parameters of the water that my living creatures are occupying, not what's going on down below.
I put mine in my overflow, purely out of convenience for ease of cleaning and inspection. I've got about 12X per hour exchange rate with my system, so essentially the tank water's being exchanged roughly every 5 minutes. I would think that there would be little to no difference between tank and sump parameters. Would you guys agree with this assumption?
My other line of thinking was that, I want to directly measure the parameters of the water that my living creatures are occupying, not what's going on down below.
I keep mine in the dark (in my sump). Allowing algae to grow on them will shorten the time needed before you need to to clean and recalibrate them. If you have reasonable flow, the sump will have the same pH and ORP as the main tank, unless you are quite near something impacting them (like a CaCO3/CO2 reactor input, limewater input, or an ozone reactor input).
These have more:
Measuring pH with a Meter
http://www.advancedaquarist.com/issues/feb2004/chem.htm
A Comparison of pH Calibration Buffers
http://reefkeeping.com/issues/2005-02/rhf/index.htm
ORP and the Reef Aquarium
http://www.reefkeeping.com/issues/2003-12/rhf/feature/index.php
These have more:
Measuring pH with a Meter
http://www.advancedaquarist.com/issues/feb2004/chem.htm
A Comparison of pH Calibration Buffers
http://reefkeeping.com/issues/2005-02/rhf/index.htm
ORP and the Reef Aquarium
http://www.reefkeeping.com/issues/2003-12/rhf/feature/index.php
asonitez
Floodicus Maximus Flooris
I think I will move my ORP and my PH to the Return Section. the turnover with 1200GPH going into my sump and a MAG 12 returning to the tank with a T back to the fuge I think that the most accurate readings would be in the return. I have my ORP set at 400/425. I have it on a Coralife ORP controller and a new ORP probe. I let the ORP probe sit in the water for about 2 days to acclimate to the water. But I think in the Skimmer Section my readings might be skewed. Filth accumulates in the skimmer section and ORP dumps into the skimmer section then over a troth of carbon(in a long stocking bag sewn together) into the fuge. I think I should probably place the probes in the return for a more accurate reading.
FranktheTankTx
New member
My pH probe is in the return section.
Tyrenlds
Premium Member
Just posted this in a similar thread. Used for my ACJr Lab grade Ph probe. Works very well. IMO a probe located in either the display tank, overflow, or drain line would likely yield the most accurate reading.
<a href=showthread.php?s=&postid=13901990#post13901990 target=_blank>Originally posted</a> by Tyrenlds
Here's a few sketches of my setup. 1/2" compression fitting with a 1-1/2slip X 1-1/2slip X 1/2fpt
Here's the link to the compression fitting
http://www.marinedepot.com/ps_ViewItem~idProduct~OP3171.html
Last edited:
asonitez
Floodicus Maximus Flooris
dosen't aerating the water raise the pH? water rushing past the probe mixed with air from your drain... Wouldn't that give a skewed PH/ rather than water standing relatively still and the probe submerged in it? Thats why i though the return would be best. Its the best representation of the water that your pumping into your tank thats been processed. I'm not being a jerk just curious.
While I do not know what size of pH measurement errors are introduced in measuring pH in seawater in typical hobbyist in-line settings, this is not a perfect way to measure pH, and unless there is a reason to use it, I'd avoid it.
In a pH measurement method, the EPA states:
http://www.epa.gov/waterscience/methods/method/files/150_2.pdf
"Since the velocity of sample flow-through a flow through electrode can produce an offset error in pH reading, the user must have data on hand to show that the offset is known and compensation has been accomplished."
The reasons for this effect of high flow on pH measurement due to the change in ions near the electrode surface are described in detail here:
http://www.weissresearch.com/TripleLayer.htm
In a pH measurement method, the EPA states:
http://www.epa.gov/waterscience/methods/method/files/150_2.pdf
"Since the velocity of sample flow-through a flow through electrode can produce an offset error in pH reading, the user must have data on hand to show that the offset is known and compensation has been accomplished."
The reasons for this effect of high flow on pH measurement due to the change in ions near the electrode surface are described in detail here:
http://www.weissresearch.com/TripleLayer.htm
Sounds good. Let us know if you see any difference. 
:lol:
Happy Reefing.
Happy Reefing.
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