Turn skimmer on/off

[Scallopking]

Hello. I’m not finding how to yet exactly so thought I’d ask for help. I want to turn on my skimmer when ph is 8.15 and turn it off when ph is 8.2. Here’s what I have now but doesn’t work. Any help is appreciated. Thanks.

 

[landlubber]

i understand you're taking a stab at holding your ph between 8.15 and 8.20 but i'm curious why?

 

[HuduVudu]

When you use the SET command you are initializing the socket condition. In this case you are initializing it ON. If you do not use this command then the socket starts out in it's last state.

The way you have it programmed now the second PH command is is redundant. The socket always starts at ON and the only commands that will change the state are those that turn it OFF.

Subtly what this does is if the PH is above 8.2 then the socket will turn off. Otherwise it will always be ON.

If you want the socket to stay off until it goes down to 8.15 then you need to remove the SET command.

I don't know how this will impact the last command.

FWIW

 

[SuncrestReef]

As mentioned above, remove the Set ON command.

Read this FAQ about when to use Set and when to not use Set:

Read This First! New APEX Users: Read This Thread!

I am a long-time owner of Neptune Systems' products, and have been helping fellow controller owners in various Internet forums for many years. Some of you may have noticed that I spend A LOT of time doing so :) In all those years, I've seen patterns of things that people sometimes do which...

forum.neptunesystems.com

 

[Scallopking]

Thanks guys so much. Appreciate that link. There’s a small chance I might have figured it out.

 

[landlubber]

thanks for taking the time to answer

 

[Scallopking]

I’m sorry. I missed your question.
I put a CO2 scrubber on my system before and got the ph up past 8.4. I couldn’t keep up with alk demand and took it off months ago. I just tried running the scrubber over the weekend and got the ph to 8.2 and turned it off and no skimmer. I observed it keep 8.2 until the lights off. Since I don’t have a valve to switch between CO2 and room air I figured I could manage it this way.

 

[landlubber]

I’m sorry. I missed your question.
I put a CO2 scrubber on my system before and got the ph up past 8.4. I couldn’t keep up with alk demand and took it off months ago. I just tried running the scrubber over the weekend and got the ph to 8.2 and turned it off and no skimmer. I observed it keep 8.2 until the lights off. Since I don’t have a valve to switch between CO2 and room air I figured I could manage it this way.

i knew you had bigger intentions so i had to ask
Climate are obviously going to be different for most of us but for me opening a window usually has massive effect on my ph during the summer months. I'm curious if that will have any effect on your system.
ps. i do appreciate the explanation and am happy you didn't take my cheekiness personally.