ORP Probe Placement running ozone?

[seth the wine guy]

I've been running ozone for probably 6 months now. I've had an ORP probe controlling it with the APEX. After cleaning the probe today I decided to relocate its placement to a higher flow area. (Bubble trap headed back to the tank) It was located in the mouth of one of my returns in the sump where the flow is restricted due to the fact it is going into the fuge section of the tank. But, all the water it was getting was directly from the DT.

My ORP consistently measured around 360-380 in the return. When I moved it to the bubble trap it measured a full 100 points higher at 470. I'm obviously just fine with an ORP in the high 300's, but the high 400's, not so much.

I'm running the ozone through my SRO3000 skimmer. The skimmer is right next to the bubble trap returning back to the DT.

What's the proper placement for this particular probe? Which number is the one I should go with?

 

[ichthyoid]

Just a word to the wise. Several people I know of, some on here, cooked their tanks using ozone on a controller. ie- what happens if the probe goes bad? Does the ozone continue to run?

We would hate for that to happen to you.

 

[acroholic]

Seth The Wine Guy;698548 wrote: I've been running ozone for probably 6 months now. I've had an ORP probe controlling it with the APEX. After cleaning the probe today I decided to relocate its placement to a higher flow area. (Bubble trap headed back to the tank) It was located in the mouth of one of my returns in the sump where the flow is restricted due to the fact it is going into the fuge section of the tank. But, all the water it was getting was directly from the DT.

My ORP consistently measured around 360-380 in the return. When I moved it to the bubble trap it measured a full 100 points higher at 470. I'm obviously just fine with an ORP in the high 300's, but the high 400's, not so much.

I'm running the ozone through my SRO3000 skimmer. The skimmer is right next to the bubble trap returning back to the DT.

What's the proper placement for this particular probe? Which number is the one I should go with?

Seth,
I believe you want the probe placed in the sump upstream before the skimmer where the ozone is being applied. This gives an idea as to real tank ORP. To do so downstream would be like locating a sump pH probe right after a kalk drip. Your readings would be higher than they should, and not be accurate for the system as a whole.

 

[seth the wine guy]

ichthyoid;698756 wrote: Just a word to the wise. Several people I know of, some on here, cooked their tanks using ozone on a controller. ie- what happens if the probe goes bad? Does the ozone continue to run?

We would hate for that to happen to you.

Yes, so I've heard. Luckily, it doesn't even need to be on a controller. It runs wide open (for several months now) and I can't get the ORP over 380 for the water returning from the tank.

Funny thing is, my ozone generator would cook the tank if I used an air dryer but with the humidity so high in my sump room it's running at a much lower efficiency. (I think it's rated to produce around 700mg per hour! )