ORP Program question

[PotRoast]

I have my ozone generator setup and running now for a few weeks. I noticed today that my program is not doing what I want it to do.

I want the ozone generator ON whenever my ORP is less than 375.
I want it OFF whenever my ORP is more than 375.
I want the fallback to be OFF if we lose power.
I also want it OFF during feed cycles A and B.

Here is what my program looks like now. I used the built in programming provided by the Apex wizard, and added my feed cycle commands.

Fallback OFF
If ORP > 375 Then OFF
If ORP < 360 Then ON
If FeedA 000 Then OFF
If FeedB 120 Then OFF


I'm not 100% sure what my problem is....I just discovered this problem. I was surprised to find the generator ON when the ORP was 375, since it had been OFF for the past few days when the ORP was hovering around 366.

Thanks in advance for your help.

 

[schwaggs]

With that program, the only thing you know for sure is that it will be OFF when 376 or greater and ON when 359 or lower. In the middle, the outlet could be ON or OFF.

Being ON at 375 is perfectly normal with that program and so is OFF at 366.

 

[PotRoast]

OK so should it look like this?

Fallback OFF
Set ON
If ORP > 375 Then OFF
If FeedA 000 Then OFF
If FeedB 120 Then OFF

 

[aquamanic]

Try this:

Fallback OFF
Set ON
If ORP > 375 Then OFF
IF FeedA 000 Then OFF
If FeedB 000 Then OFF
If Power EB8_3 OFF 000 Then OFF

 

[aquamanic]

I was still typing

Yes, that will work like you want.

 

[RussM]

I agree with schwaggs - with your current programming, there is a nether zone between 360 & 375 where the outlet could be on or off depending on the direction of the change in ORP. Personally, I'd leave it as is. But if you want have a hard on/off point at 375, then this will do the trick:

Fallback OFF
Set OFF
If ORP < 375 Then ON
If FeedA 000 Then OFF
If FeedB 120 Then OFF

With this though, the O2 gen might end up rapidly being turned on and off as the ORP fluctuates right around 375. You can "debounce" that by using defer commands. But as I said before, I'd leave it the way you have it.

 

[PotRoast]

Thanks! I appreciate all the help this forum provides.

 

[RussM]

Well, it seems we all agree that there is more than one way to do things!

 

[aquamanic]

We need a contest some time to see how many different ways there are to skin the Neptune cat!