apex help setting up my dosing pump

[bonomo53]

So i recently upgraded my dosing pumps to a single unit that controls 3 pumps. since it has a programmer built in it already i was wondering how i can run it on the apex so that its always on but if my ph gets to high it will shut it off.

 

[o2manyfish]

First you need to know if the Dosing pump programmer remembers it's programming when its unplugged. And if once it is turned back on it goes back to functioning.

If it remembers it's settings and returns to an "On" state then just plug the dosing unit into an outlet on your EB8 and program that outlets to the parameters you want to maintain.

Dave B

 

[dunc101]

Easy enough
.....
Fallback ON
SET ON
if pH > 8.4 then OFF
..........
Fallback ON means it will keep your dosing pump ON even in the event that the eb8 cannot contact the controller.
SET ON - keep the outlet always on unless the pH > 8.4 then turn it off.
8.4 is the pH thresh hold.... and this is assuming the name of the pH probe is pH

 

[dunc101]

Ah, one other case I can think of. Some dosing pumps will dose as soon as you turn the pump back on (marine color for instance and probably a bubble magus). Because of this, you may want a DEFER statement otherwise what could happen is pH > 8.4 turns it off... once the pH falls below 8.3 it turns back on and then it dumps more alk in the tank which turns it back off and you get an infinite cycle....

So, something like the following:
---
Fallback ON
SET ON
if pH > 8.4 then OFF
DEFER 000:10 THEN OFF
DEFER 005:00 THEN ON
---
The DEFER 000:10 THEN OFF will make sure that pH > 8.4 for 10 seconds before turning it off
The DEFER 005:00 THEN ON will make sure that the outlet has been in the ON position for 5 minutes before turning it ON. This means that as soon as pH reaches 8.3, it will wait 5 minutes before physically turning the outlet back on. Do realize that this also means it will wait 5 minutes whenever you first put the outlet into 'AUTO' on the apex.