BRS Dosing Ca and Alk Code

[Charlie]

Can someone check these codes for my BRS Dosers?
What part of the code tells the doser how long to run?

CA
Fallback OFF
OSC 000:00/009:00/051:00 Then ON
If Time 16:00 to 08:59 Then OFF


ALK
Fallback OFF
OSC 000:00/006:30/053:30 Then ON
If Time 05:00 to 18:59 Then OFF
If pH > 8.25 Then OFF

[zombie]

Nobody can verify if your code is correct unless you state how much you want to dose each day.

You might be an engineer if...You have no life and can prove it mathematically.

[rkpetersen]

The OSC command works like this: The first number is the offset from midnight for the first activation. The second number is the length of time the device is on, if the last word in the line is ON, as you have it (the most common usage.) The third number is how long it stays off before returning to the second number for the next on period. The whole thing resets every midnight, if the total number of minutes divides evenly into 1440 (number of minutes in a day), as is true in your example.

So, the way you have it, it's 9 minutes on per hour for calcium from 9A to 4P, and 6.5 minutes on per hour for alkalinity from 7P to 5A.

[RussM]

The first number is the offset from midnight for the first activation.

The third number is how long it stays off before returning to the second number for the next on period.

This is incorrect. The first time value is not just a one-shot thing at midnight; it is included in every cycle.

[rkpetersen]

This is incorrect. The first time value is not just a one-shot thing at midnight; it is included in every cycle.

Sorry, my mistake, I misremembered, I should have checked it before typing. The first number offsets the time of activation. I even have it this way for one of my programs. OSC 015:00/000:10/014:50 Then ON - Activates for 10 seconds at 15 and 45 minutes after the hour, every hour.

[Charlie]

Thanks for the information...clears it up for sure.
So currently it looks like I need to dose 16.5ml per day of Alk, so here is my code on my BRS Doser that is calibrated to 1.6ml per minute.
Fallback OFF
OSC 000:00/000:28/059:32 Then ON
If pH > 8.35 Then OFF

Does this look good....anything you would change?

I am still working on dialing in my calcium and figuring out daily usage, then I can get that code setup.

[Todd]

You dont say what you are using for ALK, but I assume it will increase pH. You might want to dose overnight rather than across a full 24 hrs to reduce pH swing. I also prefer to separate Ca dosing as well so do it during the day.

[Charlie]

Sorry....it's the BRS 2 part.

[Charlie]

So I am thinking this should be good....It should dose from 9pm to 8 am
Look good?

Fallback OFF
OSC 000:00/001:00/059:00 Then ON
If Time 08:00 to 20:59 Then OFF
If pH > 8.35 Then OFF

[rkpetersen]

Based on your doser calibration, that should dose 11 x 1.6 = 17.6 ml/day.

[RussM]

For 16.5ml/day using a 1.6ml/min pump, with hourly dosing from 9PM through 8AM, the code should be:

Fallback OFF
OSC 000:00/000:56/059:04 Then ON
If Time 08:00 to 20:59 Then OFF
If pH > 8.35 Then OFF

The last dose in each overnight cycle will be a 7AM.