Higher ORP and more Stable pH..Wow

[Randy Holmes-Farley]

Well, I'd say it is not compensating based on the data, or there is a strong bias in the compensation.

The effect of temperature on pH is very small over the range shown there. Way too small to notice. From 72 deg F to 79 deg F, the correction is only 0.014 pH units.

But if the temp probe went whacko and was giving temps way out of line (like 20 deg F, 150 deg F, etc, then the correction could be large.

We discuss the correction effect here:

http://reefcentral.com/forums/showthread.php?s=&postid=12145007#post12145007

FWIW, I'm not referring to any correlation to the above data, but to this comment:

I also believe that the my Aqua controller uses the temp for the ORP and pH or one of the two. I noticed this when my temp sensor went bad the AC3 was showing some really weird numbers on ORP or pH, maybe both. Once I got the temp sensor swapped things when back to normal.

 

[m2434]

:lol:
FWIW, the relationship may be spurious anyway :lol:
Guestimating the light cycle to be around 10am-10pm, would eliminate any significant association, and would be consistient with the idea of confounding phase relationship.

Of course, I may be the only person here who this intresting :lol:

 

[sditch]

m2434,

I think I did and an hour to my MH (2x250) for 9 hours rather then 8 about 4 weeks ago when i switched to a pheniox bulb. My Alk. as about 11.0 - 11.5 from both salifert and TM alk test kits. The second dip in the ORP was when I switched my topoff to shoot into the tank, close to the ORP probe whitch caused to lowering of the ORP. I had to clean the probe to get it back to notmal.

I have since stopped kalk in my top off since my Alk and Cac. was running high. The ORP has not gone backup past 320 yet. I wounder if will increase on this weeks dose of Prodibio (It will be my second dose).